Product Overview and Selection Scope
NB5R5C684N-HT is a 5.5 V rated, 0.68 F high-temperature C-type coin supercapacitor with same-side solder tabs. Its Ø21 mm package is intended for RTC backup and low-power hold-up where operation from −40 °C to +85 °C is required.
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.
| Segment | Meaning | Value for this product | Engineering note |
|---|---|---|---|
| NB | Series | Coin supercapacitor | Identifies the source NB button-type product family. |
| 5R5 | Series voltage code | 5.5 V rated | The supplied specification does not state a separate surge-voltage value. |
| C | Terminal format | C-type same-side solder tabs | Confirm the footprint and marked polarity before PCB release. |
| 684 | Capacitance code | 0.68 F | Nominal capacitance before tolerance, temperature and ageing margins. |
| N | Capacitance tolerance code | Source designation | The product-performance table specifies −20% to +80%; that controlled value governs this page. |
| HT | Function code | High-temperature type | Specified operating range: −40 °C to +85 °C. |
Electrical Characteristics
Values below are transcribed from the supplied NYFEA specification. No separate surge-voltage value is stated in that document.
| Parameter | Condition | Specified value | Unit |
|---|---|---|---|
| Rated operating voltage | UR | 5.5 | V |
| Surge voltage | Not separately specified in the supplied document | — | — |
| Nominal capacitance | C | 0.68 | F |
| General capacitance tolerance | IEC 62391-1 | −20 to +80 | % |
| Controlled capacitance tolerance | Controlled option | −10 to +20 | % |
| Category temperature range | Ambient | −40 to +85 | °C |
| Rated current | Source rating | 10 | mA |
| Instantaneous maximum working current | Source limit | 60 | mA |
| Maximum ESR | 1 kHz, 10 mA, room temperature | 20 | Ω |
| Leakage current | After 24 h at rated voltage | 8 | µA |
Mechanical Dimensions and Polarity
The component uses a polarized C-type coin construction with both solder tabs extending from the same side. Confirm PCB polarity before assembly.
| Dimension | Nominal | Tolerance | Design use |
|---|---|---|---|
| Body diameter D | 21 mm | Per source drawing | Cylindrical envelope |
| Body thickness h | 9 mm | Per source drawing | Axial package depth |
| Terminal spacing P | 5 mm | Per source drawing | PCB hole spacing |
| Lead dimension H | 6 mm | Per source drawing | Minimum layout allowance |
| Terminal features B / C / E | 0.5 / 0.8 / 1.2 mm | Per source drawing | Verify the released PCB footprint against the source drawing. |
Reliability and Endurance
| Test | Source condition | Capacitance requirement | ESR requirement |
|---|---|---|---|
| High-temperature load | 5.5 V at +85 ±2 °C for 1000 h | Within ±30% of initial | ≤4 × initial value |
| Low-temperature characteristic | −40 °C source test point | ≥50% of initial value | ≤4 × initial value |
| Storage life | 5.5 V at +85 ±2 °C for 1000 h | Within ±30% of initial | ≤2 × initial value |
| Damp heat | +85 °C / 85% RH for 240 h after 1 h charging | Within ±30% of initial | ≤4 × initial value |
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.
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 verification, apply the 5.5 V rated operating voltage and measure the current after the source-specified 24-hour charging period.
PCB Mounting, Soldering and Handling
Assembly and environmental conditions directly affect reliability. Apply the following source-specification precautions during layout and process qualification.
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 compact 5.5 V rated, 0.68 F high-temperature backup component. They are not end-product certification claims.
RTC BackupMaintain timekeeping through a brief loss of the main supply.
Memory RetentionSupport low-power state preservation and orderly data save.
Smart Meter Data SaveProvide a short window for nonvolatile recording after mains loss.
Industrial Control NodesSupport low-power backup across the source-specified temperature range.
Wireless Sensor BackupMaintain low-power state between supply events after circuit validation.The source specification does not claim automotive, medical, functional-safety, life-support or fault-tolerant qualification. Confirm all mandatory standards for the end product.
NB5R5C684N-HT Engineering FAQs
What are the rated voltage and nominal capacitance?
The rated operating voltage is 5.5 V and the nominal capacitance is 0.68 F. The supplied specification does not state a separate surge voltage.
What capacitance tolerance is specified?
The supplied specification states −20% to +80%, corresponding to an initial range of 0.544 F to 1.224 F before additional temperature and ageing allowances. A controlled −10% to +20% option is also listed.
What is the maximum ESR?
The maximum ESR is 20 Ω at 1 kHz and 10 mA at room temperature.
What is the operating temperature range?
The specified operating range is −40 °C to +85 °C.
What are the package dimensions and lead pitch?
The source drawing lists a Ø21 × 9 mm body, 5 mm terminal spacing and flat C-type tabs.
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.
Is a separate surge voltage specified?
No. The supplied document states a 5.5 V rated voltage but does not provide a separate surge-voltage value.
Which document controls production decisions?
The supplied NB5R5C684N-HT PDF and the current NYFEA-controlled revision remain the design authority.
This page summarizes the supplied NB5R5C684N-HT product specification for component evaluation. Confirm the current revision, dimensions, polarity, voltage rating, test conditions, assembly process and qualification requirements before production release.
