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NJM431U Equivalent & Substitute Parts
Part Overview
The NJM431U is a shunt voltage reference IC manufactured by Nisshinbo Micro Devices Inc., classified as a Power Management (PMIC) component. This adjustable reference device operates with a 2.495V output, supports up to 36V input, and delivers 100 mA output current with ±2.2% tolerance in a SOT-89-3 surface mount package. The NJM431U is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Direct replacements and upgraded alternatives are available from Texas Instruments and Diodes Incorporated with improved specifications and active product status.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer | Nisshinbo Micro Devices Inc. | — |
| Part Number | NJM431U | — |
| Category | Power Management (PMIC) | — |
| Reference Type | Shunt | — |
| Output Type | Adjustable | — |
| Voltage - Output (Min/Fixed) | 2.495 | V |
| Voltage - Output (Max) | 36 | V |
| Current - Output | 100 | mA |
| Tolerance | ±2.2% | — |
| Current - Cathode | 1 | mA |
| Operating Temperature | -40 to 85 | °C |
| Package / Case | TO-243AA | — |
| Supplier Device Package | SOT-89-3 | — |
| Mounting Type | Surface Mount | — |
| Product Status | Obsolete | — |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) | — |
Substitute Part Grouping Explanation
Substitution of the NJM431U is determined by strict electrical and mechanical compatibility criteria. All substitute parts must maintain the following core parameters:
Critical Compatibility Parameters:
- Reference Type: Shunt
- Output Type: Adjustable
- Voltage - Output (Min/Fixed): 2.495V or 2.5V (functionally equivalent)
- Voltage - Output (Max): 36V
- Current - Output: 100 mA
- Package / Case: TO-243AA
- Supplier Device Package: SOT-89-3
- Mounting Type: Surface Mount
Tolerance Grouping: Substitute parts are grouped by output voltage tolerance specification. The NJM431U operates at ±2.2% tolerance. Direct equivalents maintain this tolerance, while upgraded alternatives offer tighter tolerances (±1%, ±0.5%, ±0.4%, ±0.8%) for applications requiring higher precision.
Temperature Range Consideration: The NJM431U operates from -40°C to 85°C. Substitute parts from Texas Instruments and Diodes Incorporated extend the upper operating temperature to 125°C, providing enhanced thermal performance without compromising lower temperature operation.
Cathode Current: The NJM431U specifies 1 mA cathode current. Texas Instruments TL431 series parts with "A" or "B" grade designations operate at 700 µA, representing a lower quiescent current specification. Diodes Incorporated AS431 and AZ431 series maintain 1 mA cathode current alignment with the original part.
Parameter Comparison
| Part Number | Manufacturer | Voltage Output (Min) | Voltage Output (Max) | Current Output | Tolerance | Cathode Current | Operating Temp | Package | Product Status | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|---|
| NJM431U | Nisshinbo Micro Devices | 2.495V | 36V | 100 mA | ±2.2% | 1 mA | -40 to 85°C | SOT-89-3 | Obsolete | — |
| TL431QPKG3 | Texas Instruments | 2.495V | 36V | 100 mA | ±2.2% | 1 mA | -40 to 125°C | SOT-89-3 | Obsolete | Tape & Reel |
| TL431QPK | Texas Instruments | 2.495V | 36V | 100 mA | ±2.2% | 1 mA | -40 to 125°C | SOT-89-3 | Active | Cut Tape & Digi-Reel |
| TL431AQPK | Texas Instruments | 2.495V | 36V | 100 mA | ±1% | 700 µA | -40 to 125°C | SOT-89-3 | Active | Cut Tape & Digi-Reel |
| TL431BQPK | Texas Instruments | 2.495V | 36V | 100 mA | ±0.5% | 700 µA | -40 to 125°C | SOT-89-3 | Active | Cut Tape & Digi-Reel |
| TL431BQPKG3 | Texas Instruments | 2.495V | 36V | 100 mA | ±0.5% | 700 µA | -40 to 125°C | SOT-89-3 | Obsolete | Tape & Reel |
| TL431AIPK | Texas Instruments | 2.495V | 36V | 100 mA | ±1% | 700 µA | -40 to 85°C | SOT-89-3 | Active | Cut Tape & Digi-Reel |
| AS431ARTR-G1 | Diodes Incorporated | 2.5V | 36V | 100 mA | ±0.5% | 1 mA | -40 to 125°C | SOT-89-3 | Active | Cut Tape & Digi-Reel |
| AS431BRTR-E1 | Diodes Incorporated | 2.5V | 36V | 100 mA | ±1% | 1 mA | -40 to 125°C | SOT-89-3 | Active | Tape & Reel |
| AZ431AR-ATRE1 | Diodes Incorporated | 2.5V | 36V | 100 mA | ±0.4% | 1 mA | -40 to 125°C | SOT-89-3 | Active | Tape & Reel |
| AZ431BR-ATRE1 | Diodes Incorporated | 2.5V | 36V | 100 mA | ±0.8% | 1 mA | -40 to 125°C | SOT-89-3 | Active | Tape & Reel |
Engineering Selection Recommendations
Direct Equivalent (Same Tolerance, Same Temperature Range): No direct equivalent exists with identical specifications. The NJM431U combines ±2.2% tolerance with -40°C to 85°C operating range. TL431QPKG3 matches tolerance and cathode current but extends temperature to 125°C and is obsolete.
Recommended Primary Substitute (Active Status, Matching Tolerance): TL431QPK from Texas Instruments is the recommended substitute for new designs and production continuity. This part maintains ±2.2% tolerance, 1 mA cathode current, and 2.495V output specification while offering active product status, extended -40°C to 125°C operating temperature, and ROHS3 compliance. Packaging is Cut Tape & Digi-Reel, suitable for both manual and automated assembly.
Upgraded Alternatives (Tighter Tolerance, Active Status): For applications requiring improved voltage accuracy, TL431AQPK (±1% tolerance) and TL431BQPK (±0.5% tolerance) provide enhanced performance. Both operate at -40°C to 125°C and maintain 100 mA output current. These parts reduce cathode current to 700 µA, lowering quiescent power consumption.
Diodes Incorporated Alternatives (Cathode Current Alignment): AS431BRTR-E1 (±1% tolerance) and AZ431AR-ATRE1 (±0.4% tolerance) maintain 1 mA cathode current matching the NJM431U. Both operate at -40°C to 125°C with 100 mA output. AZ431BR-ATRE1 offers ±0.8% tolerance as an intermediate precision option. All Diodes Incorporated parts carry active product status and ROHS3 compliance.
Compliance and Certification: All recommended substitutes carry ROHS3 compliance and REACH unaffected status. Moisture sensitivity levels vary: Texas Instruments parts maintain MSL 2 (1 Year); Diodes Incorporated AS431ARTR-G1 and AZ431AR-ATRE1 specify MSL 3 (168 Hours); AS431BRTR-E1 and AZ431BR-ATRE1 specify MSL 1 (Unlimited).
Frequently Asked Questions (FAQ)
Q: Can TL431QPK directly replace NJM431U without circuit modification? A: Yes. TL431QPK maintains identical electrical specifications: 2.495V output, ±2.2% tolerance, 100 mA output current, 1 mA cathode current, and SOT-89-3 package. The extended operating temperature (-40°C to 125°C versus -40°C to 85°C) provides additional thermal margin without affecting circuit operation.
Q: What is the difference between TL431QPKG3 and TL431QPK? A: Both parts are electrically identical with ±2.2% tolerance and 1 mA cathode current. TL431QPKG3 is obsolete and supplied in Tape & Reel packaging. TL431QPK is active and supplied in Cut Tape & Digi-Reel packaging, making it the preferred choice for new production.
Q: Why do some substitutes specify 700 µA cathode current instead of 1 mA? A: Texas Instruments TL431 "A" and "B" grade parts (TL431AQPK, TL431BQPK) operate at 700 µA cathode current, reducing quiescent power consumption. This is a design improvement and does not affect voltage reference accuracy or output current capability. Circuits designed for 1 mA cathode current operate correctly with 700 µA parts.
Q: Are Diodes Incorporated AS431 and AZ431 series fully compatible with NJM431U? A: Functionally compatible with one specification difference: output voltage is 2.5V instead of 2.495V. This 0.005V difference (0.2%) is negligible in most applications and falls within typical circuit tolerance budgets. All other parameters—100 mA output, SOT-89-3 package, adjustable reference type—are identical.
Q: Which substitute offers the best voltage accuracy? A: AZ431AR-ATRE1 from Diodes Incorporated provides the tightest tolerance at ±0.4%, followed by TL431BQPK at ±0.5%. Both maintain 100 mA output current and SOT-89-3 packaging. Selection depends on application accuracy requirements and preferred supplier.
Q: What is the impact of different packaging types (Tape & Reel vs. Cut Tape)? A: Tape & Reel packaging is optimized for high-volume automated assembly. Cut Tape & Digi-Reel packaging accommodates both manual and automated assembly with smaller order quantities. Electrical performance is identical; packaging choice depends on production volume and assembly equipment.
Q: Can I use TL431AQPK or TL431BQPK as drop-in replacements for NJM431U? A: Yes, with consideration of two differences: (1) Cathode current is 700 µA instead of 1 mA, reducing quiescent power; (2) Tolerance is tighter (±1% or ±0.5% versus ±2.2%), improving voltage accuracy. Both changes are beneficial and do not require circuit modification.
Q: What is the moisture sensitivity level (MSL) impact on storage and handling? A: NJM431U specifies MSL 2 (1 Year shelf life). TL431QPK matches this specification. Diodes Incorporated parts vary: AS431BRTR-E1 and AZ431BR-ATRE1 offer MSL 1 (unlimited shelf life), while AS431ARTR-G1 and AZ431AR-ATRE1 specify MSL 3 (168 hours). Lower MSL numbers provide longer storage capability without baking requirements.
Q: Are all recommended substitutes RoHS3 compliant? A: Yes. All Texas Instruments and Diodes Incorporated substitutes listed carry RoHS3 compliance certification and REACH unaffected status, meeting environmental and regulatory requirements for current production standards.
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