What supply-voltage range is specified for SN74AHCT1G08?

The recommended operating supply-voltage range is 2.0 V to 5.5 V.

Are the SN74AHCT1G08 inputs TTL compatible?

The product specification describes the inputs as TTL-voltage compatible. For VCC from 4.5 V to 5.5 V, the recommended HIGH-level input voltage is at least 2.0 V and the LOW-level input voltage is at most 0.8 V.

Can SN74AHCT1G08 be used when VCC is powered down?

The device specifies Ioff for partial-power-down operation. The Ioff circuit disables the output when the device is powered down to help prevent current backflow. System power sequencing and pin currents must still be validated against the complete specification.

What packages are available for SN74AHCT1G08?

The ordering table lists SN74AHCT1G08DCKR in SC70-5 with marking BEG and SN74AHCT1G08DBVR in SOT23-5 with marking B08S. Both are tape-and-reel options with 3,000 devices per reel.

What is the SN74AHCT1G08 propagation delay?

The specification lists typical propagation delay of 15.5 ns at 2.0 V ±0.2 V with 30 pF, 13.5 ns at 3.3 V ±0.3 V with 50 pF, and 4.1 ns at 5.0 V ±0.5 V with 50 pF. These AC values are characterized or ensured by design and are not production tested.

What should be done with unused SN74AHCT1G08 inputs?

Unused inputs must not float. Hold each unused input at VCC or GND to ensure a defined logic state and proper device operation.

Does SN74AHCT1G08 require a bypass capacitor?

The product specification recommends a local bypass capacitor, with 0.1 µF recommended for a single-supply device. Place the capacitor as close as practical between VCC and GND.

Is SN74AHCT1G08 qualified for medical or safety-critical equipment?

The product specification lists blood-pressure monitors and CPAP machines among example applications, but it does not state medical, safety, automotive or functional-safety qualification. The finished system requires independent qualification and risk assessment.

SN74AHCT1G08 Single 2-Input Positive-AND Gate

Q: What logic function does SN74AHCT1G08 perform?

SN74AHCT1G08 is a single 2-input positive-AND gate. Output Y is HIGH only when both input A and input B are HIGH; the Boolean function is Y = A · B.

The NYFEA SN74AHCT1G08 implements one 2-input positive-AND function in a five-terminal package. It operates from 2.0 V to 5.5 V, accepts TTL-voltage-compatible inputs, specifies partial-power-down I_off, and is offered in SOT23-5 and SC70-5 packages for −40 °C to +125 °C operation.

Product scope: SN74AHCT1G08 is a combinational logic gate, not a voltage regulator, sequencer, latch, oscillator, level-shifter controller or safety monitor. It stores no state. Output Y is HIGH only while both A and B are interpreted as HIGH. Verify logic thresholds, output loading, edge rate, power sequencing and system fault behavior in the final design.

Download SN74AHCT1G08 Datasheet View Logic Function and Pinout

This page is an engineering selection summary. The controlled PDF remains the authority for limits, footnotes, package tolerances and production release.

NYFEA SN74AHCT1G08 single-gate logic IC product appearance with SOT23-5 and SC70-5 packages — SN74AHCT1G08 package-appearance rendering with NYFEA brand and model identification. Use package drawings and ordering markings—not this rendering—for incoming inspection.

Y = A · BSingle 2-input positive-AND function

2.0 V to 5.5 VRecommended VCC operating range

4.1 ns typicalVCC = 5.0 V ±0.5 V, CL = 50 pF, RL = 500 Ω

SOT23-5 · SC70-5−40 °C to +125 °C operating temperature

Product Overview and Selection Scope

SN74AHCT1G08 is a single-gate AHCT logic device for combining two positive-logic conditions. Its output is asserted only when both inputs meet the HIGH-level threshold. The device is optimized for operation around a 5 V logic rail while retaining a recommended VCC range of 2.0 V to 5.5 V.

Single positive-AND gate: one A input, one B input and one Y output.
TTL-voltage-compatible inputs: at VCC = 4.5 V to 5.5 V, VIH is 2.0 V minimum and VIL is 0.8 V maximum.
Partial-power-down support: I_off is specified with VCC = 0 V to help prevent backflow through the output path.
Low static supply current: 0.1 µA typical at +25 °C under the stated ICC test condition; 10 µA maximum over the full operating range.
Output drive: at VCC = 5.0 V and |IO| = 32 mA, VOH is 4.2 V minimum and VOL is 0.5 V maximum over the full temperature range.
Wide ambient range: −40 °C to +125 °C.
Compact options: SC70-5 and SOT23-5, both MSL3 and supplied on 3,000-piece tape-and-reel packaging.
Green packages: the product description identifies both package options as Green.

Selection boundaryAHCT input thresholds are not the same as CMOS rail-ratio thresholds. Confirm the actual driving device's guaranteed VOH/VOL at the selected VCC. A valid logic threshold does not by itself guarantee acceptable noise margin, timing, overshoot or power-sequence current.

Logic Function, Truth Table and Five-Pin Assignment

The Boolean function is Y = A · B. In positive logic, Y is HIGH only for A = HIGH and B = HIGH. The package pin assignment is common to both listed package options.

SN74AHCT1G08 positive AND logic symbol and four-state truth table — Positive-AND logic function and truth table based on the product specification.

SN74AHCT1G08 SOT23-5 and SC70-5 top-view pinout — Five-pin top view: A pin 1, B pin 2, GND pin 3, Y pin 4 and VCC pin 5.

Pin	Name	Type	Function	Design note
1	A	Input	Positive-logic input A	Do not leave floating.
2	B	Input	Positive-logic input B	Do not leave floating.
3	GND	Power	Ground reference	Connect to a low-impedance return.
4	Y	Output	AND-function output	Avoid bus contention and excessive capacitive loading.
5	VCC	Power	Supply input	Bypass locally to GND.

Ordering Codes, Markings and Package Selection

Two orderable part numbers are listed. The electrical operating range is the same; the primary selection differences are package size, body tolerance and top marking.

Orderable part number	Package	Package marking	MSL	Shipment	Temperature range
SN74AHCT1G08DCKR	SC70-5	BEG	MSL3	Tape and reel, 3,000	−40 °C to +125 °C
SN74AHCT1G08DBVR	SOT23-5	B08S	MSL3	Tape and reel, 3,000	−40 °C to +125 °C

SC70-5Smaller body: D = 2.000–2.200 mm; E1 = 2.150–2.450 mm; 0.650 mm nominal pitch.

SOT23-5Larger body: D = 2.820–3.020 mm; E1 = 2.650–2.950 mm; 0.950 mm nominal pitch.

Do not select by name aloneConfirm land pattern, top marking, assembly capability, reel orientation and complete ordering code.

Recommended Operating Conditions and Absolute Limits

Recommended operating conditions define the region in which normal device operation is specified. Absolute maximum ratings are stress limits, not design operating points.

Recommended operating conditions

Parameter	Symbol	Condition	Minimum	Maximum	Unit
Supply voltage	VCC	Operating	2.0	5.5	V
HIGH-level input voltage	VIH	VCC = 2.0 V	1.0	—	V
		VCC = 3.3 V	1.5	—
		VCC = 4.5 V to 5.5 V	2.0	—
LOW-level input voltage	VIL	VCC = 2.0 V	—	0.3	V
		VCC = 3.3 V	—	0.55
		VCC = 4.5 V to 5.5 V	—	0.8
Input voltage	VI	Recommended	0	5.5	V
Output voltage	VO	Recommended	0	VCC	V
Input transition rise or fall	Δt/Δv	VCC = 2.0 V to 5.5 V	—	5	ns/V
Operating free-air temperature	TA	—	−40	+125	°C

Absolute maximum ratings

Parameter	Condition	Minimum	Maximum	Unit
Supply voltage, VCC	Stress rating	−0.5	6.5	V
Input voltage, VI	Stress rating	−0.5	6.5	V
Output voltage, VO	High-impedance or power-off state	−0.5	6.5	V
Output voltage, VO	HIGH or LOW state	−0.5	VCC + 0.5	V
Continuous output current	IO	−50	+50	mA
Continuous VCC or GND current	—	−100	+100	mA
Junction temperature	TJ	−65	+150	°C
Storage temperature	Tstg	−65	+150	°C

Stress-limit warningOperation at an absolute maximum rating is not specified. Repeated or prolonged stress can affect reliability. Use recommended conditions plus system-specific transient, thermal and derating margins.

DC Electrical Characteristics with Test Conditions

Voltage levels and current values are meaningful only together with VCC, load current and temperature. “Typical” values are characterization norms, not guaranteed limits.

Output HIGH and output LOW

Parameter	Test current	VCC	Temperature	Guaranteed value	Unit
VOH	IOH = −100 µA	2.0 V to 5.5 V	Full	Minimum VCC − 0.1	V
VOH	IOH = −8 mA	2.0 V	Full	Minimum 1.6	V
VOH	IOH = −24 mA	3.3 V	Full	Minimum 2.5	V
VOH	IOH = −32 mA	4.5 / 5.0 / 5.5 V	Full	Minimum 3.8 / 4.2 / 4.8	V
VOL	IOL = 100 µA	2.0 V to 5.5 V	Full	Maximum 0.1	V
VOL	Source table prints IOH = 8 mA	2.0 V	Full	Maximum 0.45	V
VOL	Source table prints IOH = 24 mA	3.3 V	Full	Maximum 0.55	V
VOL	IOL = 32 mA	4.5 / 5.0 / 5.5 V	Full	Maximum 0.55 / 0.50 / 0.45	V

Controlled-document clarification requiredThe Rev A.1 PDF labels the 2.0 V and 3.3 V VOL current rows as I_OH, while the surrounding VOL rows use I_OL. This page reproduces the source notation rather than silently changing it. Confirm those two symbols with NYFEA before using the rows in a controlled design calculation.

Leakage, supply current and input capacitance

Parameter	Test condition	VCC	Temperature	Typical	Maximum	Unit
Input current, II	A or B at 5.5 V or GND	0 V to 5.5 V	+25 °C / full	±0.1 / —	— / ±5	µA
Power-off leakage, Ioff	VI or VO = 5.5 V	0 V	+25 °C / full	±0.1 / —	— / ±10	µA
Supply current, ICC	VI = 5.5 V or GND; IO = 0	2.0 V to 5.5 V	+25 °C / full	0.1 / —	— / 10	µA
Additional supply current, ICCT	One input at 3.4 V; other input at VCC or GND	5.5 V	Full	—	500	µA
Input capacitance, Ci	VCC = 0 V; f = 10 MHz	0 V	+25 °C	6	—	pF

AC Switching Characteristics and Measurement Conditions

The AC table lists typical propagation delay and power-dissipation capacitance. The specification states that these values are ensured by design and/or characterization and are not production tested.

Parameter	VCC	Load	Typical	Unit	Status
Propagation delay, tpd	2.0 V ±0.2 V	CL = 30 pF; RL = 500 Ω	15.5	ns	Typical
Propagation delay, tpd	3.3 V ±0.3 V	CL = 50 pF; RL = 500 Ω	13.5	ns	Typical
Propagation delay, tpd	5.0 V ±0.5 V	CL = 50 pF; RL = 500 Ω	4.1	ns	Typical
Power-dissipation capacitance, Cpd	5.0 V	f = 10 MHz	22	pF	Typical

SN74AHCT1G08 propagation delay load circuit, test-condition matrix and waveforms — Display reconstruction of the specified load circuit and voltage-dependent measurement conditions.

Dynamic power estimate for preliminary budgeting:
P_dynamic ≈ C_pd × V_CC² × f_input + C_L × V_CC² × f_output

The equation is general application guidance, not a guaranteed product-specification limit. Include short-circuit current, input-transition effects, capacitive distribution and system activity in the final power model.

Power Integrity, Input Handling and PCB Layout

Use a local bypass capacitor to provide the transient current demanded by the output stage and to reduce rail disturbance. The specification recommends 0.1 µF for a single-supply device. Parallel 0.1 µF and 1 µF capacitors are commonly used where broader-frequency decoupling is required.

SN74AHCT1G08 local bypass capacitor and unused input connection layout guidance — Place the bypass capacitor close to pins 5 and 3, and hold every unused input at a defined logic level.

Keep the supply loop short: route VCC, the bypass capacitor and GND with low inductance.
Do not float A or B: connect unused inputs to VCC or GND.
Avoid bus contention: this is a driven CMOS output, not an open-drain output.
Control the output trace: fast edges into light loads can ring; minimize stubs and excessive trace length.
Check receiving-pin limits: validate overshoot, undershoot, settling and noise margin at the actual receiver.
Validate power sequencing: I_off supports partial power down, but total system paths through other components remain external.

SOT23-5 and SC70-5 Package, Land Pattern and Tape-and-Reel Data

Package drawings and land patterns are displayed at high resolution for engineering review. PCB-library release must use the complete tolerance data in the controlled PDF and the assembler's process rules.

SN74AHCT1G08 SOT23-5 and SC70-5 package outlines and recommended land patterns — SOT23-5 and SC70-5 body ranges, lead pitch and reference pad geometry.

Dimension	SOT23-5 minimum	SOT23-5 maximum	SC70-5 minimum	SC70-5 maximum	Unit
A, overall height	1.050	1.250	0.900	1.100	mm
A1	0.000	0.100	0.000	0.100	mm
A2	1.050	1.150	0.900	1.000	mm
b, lead width	0.300	0.500	0.150	0.350	mm
c, lead thickness	0.100	0.200	0.080	0.150	mm
D, body length	2.820	3.020	2.000	2.200	mm
E, body width	1.500	1.700	1.150	1.350	mm
E1, overall lead span	2.650	2.950	2.150	2.450	mm
e, nominal pitch	0.950 BSC		0.650 BSC		mm
L, lead length	0.300	0.600	0.260	0.460	mm
θ	0°	8°	0°	8°	degree

SN74AHCT1G08 seven-inch tape-and-reel and pin-one quadrant orientation — Both package options use 7-inch reels, 8.0 mm carrier tape and Q3 pin-1 orientation; pocket dimensions differ by package.

Package	Reel	Reel width	A0	B0	K0	P0 / P1 / P2	W	Pin 1
SC70-5	7 in	9.5 mm	2.25 mm	2.55 mm	1.20 mm	4.0 / 4.0 / 2.0 mm	8.0 mm	Q3
SOT23-5	7 in	9.5 mm	3.20 mm	3.20 mm	1.40 mm	4.0 / 4.0 / 2.0 mm	8.0 mm	Q3

Application Guidance and Design Limitations

The product specification lists active-noise elimination, bar-code scanners, blood-pressure monitors, CPAP machines, fingerprint identification and network-attached storage. The gate is also described for power sequencing and LED indicator logic. These are application examples—not end-product qualification statements.

Power Sequencing and Logic EnableCombine two valid-state signals before enabling a downstream function. This gate does not generate sequencing delays.

Status and LED GatingDrive a logic-qualified indicator when both input conditions are HIGH. Add a suitable current-limiting path.

Portable medical equipment application icon

Portable Medical EquipmentExample categories include blood-pressure monitors and CPAP machines; system qualification remains mandatory.

Barcode and Biometric ScannersQualify an acquisition or control signal from two logic conditions in barcode and fingerprint equipment.

Network-Attached StorageUse for local enable, reset qualification or status logic after verifying system timing and voltage domains.

Qualification and safety boundary: no statement in the supplied Rev A.1 specification establishes automotive, medical, functional-safety, life-support or fault-tolerant qualification. Where a logic output can affect safety or data integrity, define fail-safe behavior, diagnostic coverage, power-up/down states and independent system-level validation.

SN74AHCT1G08 Engineering FAQs

What logic function does SN74AHCT1G08 perform?

It performs one 2-input positive-AND function. Y is HIGH only when A and B are both HIGH; otherwise Y is LOW.

What supply-voltage range is specified?

The recommended operating VCC range is 2.0 V to 5.5 V. Absolute maximum VCC is 6.5 V, but the absolute maximum is a stress limit and is not an operating target.

Are the inputs TTL compatible?

The specification describes the inputs as TTL-voltage compatible. At VCC from 4.5 V to 5.5 V, VIH is 2.0 V minimum and VIL is 0.8 V maximum. Confirm the driving device's guaranteed levels and noise margin.

Can an input be left open?

No. Every unused input must be held at VCC or GND. A floating CMOS input can assume an undefined voltage, increase current and produce unpredictable output switching.

What does Ioff provide?

Ioff supports partial-power-down operation by limiting current when VCC is 0 V and an input or output is at 5.5 V. It helps prevent current backflow through the device output path, but does not validate the complete system power sequence.

Is 4.1 ns a guaranteed maximum propagation delay?

No. The 4.1 ns value is typical at VCC = 5.0 V ±0.5 V, CL = 50 pF and RL = 500 Ω. The AC table states that the values are ensured by design or characterization and are not production tested.

Which orderable package should be selected?

SN74AHCT1G08DCKR is the SC70-5 option with marking BEG. SN74AHCT1G08DBVR is the SOT23-5 option with marking B08S. Select by land pattern, assembly capability, body size and ordering code—not only by the shared base part number.

How should the device be decoupled?

Use a local bypass capacitor between VCC and GND. The product specification recommends 0.1 µF for a single-supply device, placed as close as practical to the power pins.

Can the output directly drive a high-current load?

The output drive data are logic-output specifications under defined voltage and current conditions, not a general load-power rating. Use a transistor or driver for relays, motors, high-power LEDs and other loads that exceed the DC, transient or thermal limits.

Does the application list establish product certification?

No. The listed application examples do not establish medical, automotive, safety or regulatory qualification. Qualification applies to the complete selected component revision and finished system.

Technical source and design authority

This page summarizes SN74AHCT1G08_(RevA.1).pdf for component evaluation and engineering reference. It does not replace the complete controlled specification. Confirm the current revision, ordering code, package marking, pin assignment, logic thresholds, absolute maximum ratings, DC and AC conditions, load circuit, package tolerances, PCB layout, assembly process and qualification requirements before production release.

Download SN74AHCT1G08 Product Specification Contact NYFEA for Product Support