NJM2820F-TE1 - 1.25V Adjustable Shunt Voltage Reference | Nisshinbo
MPN: NJM2820F-TE1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.3438 | $0.34 |
| 10 | $0.31 | $3.10 |
| 100 | $0.24 | $24.00 |
| 500 | $0.19 | $95.00 |
| 1,000 | $0.16 | $160.00 |
| 3,000 | $0.1257 | $377.10 |
NJM2820F-TE1 Overview
A shunt voltage reference is a two-terminal (cathode + anode) reference that regulates voltage by passing current through itself into a load, behaving much like a temperature-compensated Zener diode. Compared to series-mode (bandgap) references, shunt references offer simpler wiring, programmable current via an external series resistor, and the ability to sink or source modest current directly, which makes them a flexible building block in the power-management IC family for setting reference rails.
Key features of the NJM2820F-TE1 include ±0.7% voltage accuracy, 1.25 V nominal reference with adjustment up to 13 V via an external resistor divider, 80 uA minimum cathode current, and low dynamic impedance over the operating current range. The SOT-23-5 (MTP5) package offers a small footprint suitable for dense PCB designs while still providing sufficient power dissipation for the reference's operating range.
The NJM2820 uses a buried-zener bandgap-style architecture optimized for low operating current. The reference cell is trimmed at the wafer level to achieve the ±0.7% tolerance, and the integrated temperature compensation is designed to maintain low drift across the -40 C to +85 C operating range. This combination provides stable reference behavior in environments where temperature stability matters.
Typical applications include AC-DC converter secondary-side reference voltage, ADC and DAC reference inputs, precision current-limit thresholds, and comparator reference rails. The wide 1.25 V to 13 V programmable output range makes it useful wherever a low-power, low-noise reference is required.
When designing with the NJM2820, select the external series resistor so that the cathode current stays between 80 uA and 30 mA across all load conditions. Add a 0.1 uF decoupling capacitor at the cathode to maintain stability, especially with capacitive loads.
This page synthesizes distributor pricing, drop-in alternatives, application notes, and design tips not found in the manufacturer datasheet, helping engineers evaluate the NJM2820F-TE1 quickly for reference-voltage design.
Drop-in alternatives for NJM2820F-TE1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
NJM2821F-TE1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
NJM2820F
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
NJM2820F-TE2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
NJM2822F-TE1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LM4040C25QDBZR
✅ Drop-In📋 Reference alternative (not in catalog)
NJM2820F-TE1 Specifications
| Reference Type | Shunt Voltage Reference |
| Nominal Reference Voltage | 1.25 V |
| Adjustable Output Range | 1.25 V to 13 V |
| Initial Accuracy | ±0.7% |
| Maximum Cathode Voltage | 13 V |
| Maximum Cathode Current | 30 mA |
| Minimum Cathode Current | 80 uA |
| Operating Temperature Range | -40 C to +85 C |
| Package | SOT-23-5 (MTP5) |
| Mounting Type | Surface Mount |
| Number of Pins | 5 |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Tape and Reel Packaging | TE1 suffix, 3000 pcs/reel |
| Topology | Two-terminal shunt regulator |
NJM2820F-TE1 Pin Configuration
| Pin 1 | Cathode — Reference output / cathode terminal |
| Pin 2 | Anode — Ground / anode terminal |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | Anode — Ground / anode terminal |
| Pin 5 | Cathode — Reference output / cathode terminal |
Typical Applications
NJM2820F-TE1 is suitable for 6 applications: AC-DC Converter Secondary Reference, ADC/DAC Reference Voltage, Precision Current Limit Threshold, Comparator Reference Rail, Industrial Sensor Signal Conditioning, Portable Battery-Powered Equipment.
AC-DC Converter Secondary Reference
The NJM2820F-TE1 is well suited for AC-DC converter secondary-side reference voltage generation. Its 1.25 V to 13 V adjustable output range allows precise setting of feedback reference rails for flyback, buck, and forward converter topologies. The 80 uA minimum cathode current enables the part to operate from very small auxiliary windings without loading the bias supply. Place the reference at the optocoupler feedback node with a 0.1 uF bypass capacitor; its low dynamic impedance ensures stable loop compensation across the 80 uA to 30 mA cathode current range. The SOT-23-5 (MTP5) package fits easily on the secondary-side PCB area.
Recommended
ADC/DAC Reference Voltage
The NJM2820F-TE1 provides a stable 1.25 V reference for low-to-medium resolution ADC and DAC reference inputs. The ±0.7% initial accuracy is sufficient for 8-bit to 10-bit conversion systems where reference drift dominates conversion error. Connect the cathode to the ADC/DAC REF pin with a 1 uF to 10 uF decoupling capacitor to filter reference noise. The shunt topology means it can source or sink current depending on ADC architecture. Operating from 80 uA to 30 mA, it is ideal for low-power data acquisition systems where reference current is shared with the converter.
Recommended
Precision Current Limit Threshold
The NJM2820F-TE1 enables accurate current-limit thresholds in battery chargers, power supplies, and motor drivers. By connecting the cathode to the current-sense comparator input and using the 1.25 V reference, designers can set trip points as low as 1.25 V / Rsense. The shunt topology allows the reference to be pulled above or below the threshold by external circuitry without damaging the device. Its 30 mA maximum cathode current supports driving comparator inputs directly. Add a 0.1 uF bypass capacitor for noise immunity in switching converter environments.
Recommended
Comparator Reference Rail
The NJM2820F-TE1 supplies a clean 1.25 V to 13 V reference rail for window comparators and threshold detectors. The low dynamic impedance (typically below 1 ohm) maintains reference accuracy even when the comparator input draws transient current. Use it in over-voltage, under-voltage, and power-good detection circuits across industrial and consumer applications. The 80 uA minimum operating current allows it to be powered from high-impedance bias networks without loading the source. Pair with a low-power comparator such as the LMV841 for portable battery-powered monitoring.
Recommended
Industrial Sensor Signal Conditioning
The NJM2820F-TE1 supports industrial 4-20 mA loop, RTD, and bridge sensor signal conditioning circuits where a stable excitation or reference voltage is required. Its 1.25 V to 13 V adjustable output accommodates different sensor excitation levels. The -40 C to +85 C operating range suits industrial environments including factory automation and process control. The SOT-23-5 package allows compact PCB designs inside sensor transmitters. Use it with instrumentation amplifiers and 16-bit ADCs to achieve accurate measurement over temperature.
Recommended
Portable Battery-Powered Equipment
The NJM2820F-TE1 operates from a low 80 uA cathode current, making it ideal for portable, battery-powered equipment where quiescent current matters. The shunt topology means it does not require a dedicated supply rail - it can be biased directly from the battery through a high-value series resistor. The reference maintains regulation even as the battery voltage drops, enabling accurate ADC measurements across the discharge curve. The SOT-23-5 (MTP5) package fits in wearables, handheld instruments, and IoT sensor nodes.
Recommended
Recommended Products Summary
Engineering reference data for NJM2820F-TE1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | NJM2821F-TE1 | NJM2820F (TE3) | NJM2820F-TE2 | NJM2822F-TE1 | LM4040C25QDBZR |
|---|---|---|---|---|---|---|
| Package | SOT-23-5 (MTP5) | SOT-23-5 (MTP5) - same | SOT-23-5 (MTP5) - same | SOT-23-5 (MTP5) - same | SOT-23-5 (MTP5) - same | SOT-23-3 (DBZ) |
| Brand | Nisshinbo Micro Devices | Nisshinbo Micro Devices | Nisshinbo Micro Devices | Nisshinbo Micro Devices | Nisshinbo Micro Devices | Texas Instruments |
| Reference Voltage | 1.25 V (adjustable 1.25-13 V) | 1.25 V (adjustable) | 1.25 V (same as this) | 1.25 V (same as this) | 2.5 V typical | 2.5 V fixed |
| Initial Accuracy | ±0.7% | ±0.7% typical | ±0.7% (same) | ±0.7% (same) | ±0.7% typical | ±0.5% to ±2% (grade dependent) |
| Max Cathode Current | 30 mA | 30 mA | 30 mA (same) | 30 mA (same) | 30 mA | 20 mA |
| Topology | Adjustable shunt | Adjustable shunt | Adjustable shunt (same) | Adjustable shunt (same) | Adjustable shunt | Fixed shunt |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C (same) | -40 C to +85 C (same) | -40 C to +85 C | -40 C to +125 C |
Key Differentiators
- Adjustable 1.25 V to 13 V output in same SOT-23-5 footprint (vs LM4040C25QDBZR)
- Lower minimum cathode current (80 uA) for ultra-low-power designs (vs LM4040C25QDBZR)
- Higher maximum cathode voltage (13 V vs 10 V) (vs LM4040C25QDBZR)
Design Notes
Select the external series resistor RS so that cathode current IK stays between 80 uA (minimum for regulation) and 30 mA (maximum rating) across the full input voltage and load range. Use the formula: RS = (VIN - VREF) / (IK + ILOAD). At IK = 100 uA minimum and ILOAD = 0, RS(max) = (VIN(max) - VREF) / 100 uA. At ILOAD(max), ensure IK does not exceed 30 mA. Add a safety margin of 20% on both ends to account for resistor tolerance and temperature variation.
Do not operate the NJM2820F-TE1 below 80 uA cathode current - the reference loses regulation and the output voltage collapses. Always include a 0.1 uF ceramic bypass capacitor directly at the cathode pin to ground to maintain stability, especially with capacitive loads or long PCB traces. Avoid placing large capacitors (>10 uF) directly at the cathode without a series resistor, as the reference can oscillate under certain load conditions.
Layout the NJM2820F-TE1 with the cathode bypass capacitor placed within 2 mm of the cathode pin. Use a ground plane on the anode side to minimize parasitic inductance. For adjustable configurations, place the resistor divider close to the cathode pin to reduce noise pickup. The SOT-23-5 (MTP5) thermal pad is internally connected and does not require a separate heatsink at typical 30 mA operating current.
Compliance Information
RoHS compliant per Nisshinbo product page. Not AEC-Q100 qualified - not intended for automotive safety-critical applications. Lead-free reflow compatible per JEDEC J-STD-020 MSL 1.
