What is the maximum ESR?

The maximum AC equivalent series resistance is 180 mΩ at 1 kHz; maximum DC resistance is 400 mΩ.

NM5R5L255S-P160827 5.5 V 2.5 F Combined Supercapacitor

Q: What capacitance tolerance is specified?

The supplied specification states −20% to +50%.

Product Overview and Selection Scope

NM5R5L255S-P160827 is a 5.5 V, 2.5 F combined supercapacitor with wire leads. Its higher stored energy and source-defined current capability support validated backup intervals, data capture and controlled shutdown loads.

Combined moduleNM-series construction with polarized, wire-lead terminals.

2.5 F energy storage0.0105 Wh maximum stored energy at the rated voltage.

−40 to +70 °C operationSpecified across a broad industrial temperature range.

Defined current capability1.15 A rated current at 25 °C and 3.44 A maximum peak current.

Leakage-current limit0.015 mA maximum after 72 hours at rated voltage.

Through-hole format16.0 × 8.0 × 27.0 mm nominal body with an 11.8 mm lead pitch.

Selection boundary
This device is polarized and its terminal voltage falls during discharge. Verify the ESR step, capacitance tolerance, load profile, leakage, charging current and minimum system voltage in the complete circuit.

Part-Number Construction

The designation is decoded below using the naming table in the supplied specification.

NMModule series5R55.5 VLWire lead2552.5 FS−20 / +50%PPower type16W08D27L

Segment	Meaning	Value for this product	Engineering note
NM	Series	Combined supercapacitor module	Distinguishes the module construction in the source naming system.
5R5	Rated-voltage code	5.5 V	Do not exceed the rated voltage.
L	Terminal format	Wire lead	Confirm footprint and polarity before PCB release.
255	Capacitance code	2.5 F	Nominal capacitance before tolerance and ageing margins.
S	Capacitance tolerance	−20% to +50%	Use 2.0 F as the initial minimum for conservative calculations.
P	Function code	Power type	Source naming classification; not a system-level power rating.
16 / 08 / 27	Body size codes	16 / 8 / 27 mm	Nominal W / D / L dimensions.

Electrical Characteristics

Values are transcribed from the supplied specification. Keep the stated units and test conditions attached to each parameter during comparison and design review.

Parameter	Condition	Specified value	Unit
Rated voltage	U_R	5.5	V
Nominal capacitance	C	2.5	F
Capacitance tolerance	Initial value	−20 to +50	%
Operating temperature	Ambient range	−40 to +70	°C
Maximum AC equivalent series resistance	R_AC, 1 kHz	180	mΩ
Maximum DC resistance	R_DC	400	mΩ
Maximum leakage current	After 72 h at rated voltage	0.015	mA
Rated current	At 25 °C	1.15	A
Maximum peak current	Source-specified peak value	3.44	A
Maximum stored energy	0.5CU_R² / 3600	0.0105	Wh
Energy density	Source value	2.63	Wh/kg
Power density	Source-listed value; unit requires confirmation	2.27	W/kg
Typical product mass	Source value	4.0	g

Power-density unit confirmation required
The supplied PDF lists power density as 2.27 W/kg. Applying the formula printed in the same table to 5.5 V, 400 mΩ and 4.0 g gives approximately 2.27 kW/kg. This page preserves the source value; confirm the intended unit with NYFEA before using it in comparisons or published claims.

Mechanical Dimensions and Polarity

The package is polarized. The marked negative terminal must match the PCB polarity, and the leads must not be used to absorb mechanical stress.

English mechanical drawing for NM5R5L255S-P160827 — English engineering redraw following the reference-page illustration method. All dimensions are in millimetres.

Dimension	Nominal	Tolerance	Design use
W	16.0 mm	±1.0 mm	Body width
D	8.0 mm	±1.0 mm	Body depth
L	27.0 mm	±1.5 mm	Body length
φd	0.6 mm	±0.05 mm	Lead diameter
P	11.8 mm	±0.5 mm	Lead pitch

Reliability and Endurance

The specification defines post-test limits for capacitance change and internal resistance. These are qualification conditions, not continuous-use permissions at every limit.

Test	Source condition	Capacitance change	Resistance limit
Cycle life	500,000 constant-current cycles at 25 °C between rated voltage and half-rated voltage	≤ 30% from initial	≤ 4 × initial
Storage life	1000 h with no load at the upper rated-temperature condition	≤ 30% from initial	≤ 4 × initial
Endurance	1000 h at rated voltage at the upper rated-temperature condition	≤ 30% from initial	≤ 4 × initial
Life assessment	10 years at 25 °C and rated voltage	≤ 30% from initial	≤ 4 × initial
Temperature characteristic	−40 °C, +25 °C and +70 °C	≤ 30% from initial	≤ 3 × initial
Damp-heat storage	+40 ±2 °C, 90–95% RH, 240 h	≤ 30% from initial	≤ 2 × initial

Capacitance and ESR Test Methods

For capacitance measurement, charge the device to rated voltage for 30 minutes and discharge it at the prescribed constant current. ESR is measured using the specified 1 kHz AC method.

For this 2.5 F, 5.5 V part: I = 55 mA, U₁ = 4.4 V and U₂ = 2.2 V.

1 kHz AC ESR measurement circuit — AC ESR test at 1 kHz with the source-specified test-current range of 1–10 mA.

CapacitanceC = I(t₂ − t₁) / (U₁ − U₂)

AC resistanceR_AC = U / I

Hold-Up, Leakage and Energy Calculations

Estimate the usable interval from the allowable voltage window and load current, then subtract the immediate ESR voltage step. For leakage-current testing, fully discharge the device for 1–24 hours, apply rated voltage for 72 hours, and then measure the current.

Ideal constant-current hold-upt ≈ C(V_start − V_min) / I_load

Initial ESR dropΔV_ESR = I_load × ESR

Maximum stored energyE = 0.5CU_R² / 3600

Calculation note: At nominal C = 2.5 F and U_R = 5.5 V, the ideal stored energy is approximately 0.0105 Wh. Available system energy will be lower because of the minimum operating voltage, resistance, leakage, capacitance tolerance, temperature and ageing.

PCB Mounting, Soldering and Handling

Assembly and environmental conditions directly affect reliability. Apply the following source-specification precautions during layout and process qualification.

Observe polarityReverse connection can damage the device and create a safety risk.

Stay below 5.5 VOvervoltage can drive electrolyte decomposition, heating, capacitance loss and ESR increase.

Avoid rapid high-frequency cyclingUse a validated current and thermal profile for repetitive charge–discharge operation.

Protect the body and leadsDo not tilt, twist or force the package after soldering; keep the body clear of the PCB surface.

Control solderingFor a 1.6 mm PCB, the source limit is 260 °C maximum for no more than 5 seconds.

Control storageStore from −40 to +70 °C at less than 60% RH, away from corrosive or toxic gases and rapid temperature changes.

Series connection
If devices are connected in series, implement voltage balancing and obtain NYFEA application guidance. Also validate hole size, lead pitch, cleaning chemistry, polarity inspection and mechanical support before release.

Application Guidance and Design Limitations

The applications below are engineering use cases consistent with a 5.5 V, 2.5 F backup component. They are not end-product certification claims.

RTC and Controller BackupPreserve timekeeping or controller state through a supply interruption.

Data RetentionProvide time for nonvolatile data save before a controlled shutdown.

Smart Meter Hold-UpSupport last-gasp data capture or communication after mains loss.

Industrial Control Ride-ThroughBridge brief brownouts in validated monitoring and control nodes.

Wireless Sensor BufferSupply validated short current bursts in duty-cycled sensing systems.

Qualification boundary
The source specification does not claim automotive, medical, functional-safety, life-support or fault-tolerant qualification. Confirm all mandatory standards for the end product.

NM5R5L255S-P160827 Engineering FAQs

What are the rated voltage and nominal capacitance?

The rated voltage is 5.5 V and the nominal capacitance is 2.5 F.

What capacitance tolerance is specified?

The supplied specification states −20% to +50%, corresponding to an initial range of 2.0 F to 3.75 F before additional temperature and ageing allowances.

What resistance limits are specified?

Maximum AC ESR is 180 mΩ at 1 kHz, and maximum DC resistance is 400 mΩ.

What is the operating temperature range?

The specified operating range is −40 °C to +70 °C.

What are the package dimensions and lead pitch?

The nominal body is 16.0 × 8.0 × 27.0 mm, with an 11.8 mm nominal lead pitch and 0.6 mm nominal lead diameter.

Is the component polarized?

Yes. Match the negative marking to the PCB polarity before soldering.

Can it be used as a direct battery replacement?

No. A supercapacitor has continuous voltage decay and an ESR-related voltage step. Validate the load current, minimum system voltage, usable energy and required hold-up time.

Why should the power-density unit be confirmed?

The source table states 2.27 W/kg, while its printed formula and values imply approximately 2.27 kW/kg. Confirm the intended unit with NYFEA before publication or comparison.

Which document controls production decisions?

The supplied NM5R5L255S-P160827 PDF and the current NYFEA-controlled revision remain the design authority.

Technical source and design authority

This page summarizes the supplied NM5R5L255S-P160827 product specification for component evaluation. Confirm the current revision, dimensions, polarity, resistance values, power-density unit, test conditions and assembly process before production release.

Download Product Specification Contact NYFEA for Product Support