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Diodes Incorporated AP431SHBRTR-G1
- Part No.:
- AP431SHBRTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AP431SHBRTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:990
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Product details
Overview
AP431SHBRTR-G1 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 2.495V reference voltage (±0.5% initial tolerance), 50μA typical minimum cathode current for regulation, and 36V maximum cathode voltage. It replaces Zener diodes in feedback loops of switching power supplies, USB chargers, and voltage adapters where low-power operation and thermal stability across –40°C to +125°C are required.
For engineers reviewing the AP431SHBRTR-G1 datasheet, AP431SHBRTR-G1 pinout, AP431SHBRTR-G1 application, or AP431SHBRTR-G1 equivalent, this device offers verified low-cathode-current regulation, stable 0.1Ω dynamic impedance, and SOT89 package compatibility for high-reliability power management designs.
Technical Context
The AP431SHBRTR-G1 implements a bandgap-based reference amplifier driving an NPN output stage, enabling precise voltage regulation via external resistor divider between cathode and reference pins. Its sharp turn-on characteristic and low temperature coefficient (11mV typical deviation over –40°C to +125°C) support stable closed-loop control in isolated flyback and buck-derived topologies.
It operates as a two-quadrant shunt element: sinking 100μA–100mA cathode current while maintaining <0.3Ω dynamic impedance and <0.5μA reference input current. The device remains stable under capacitive loads up to 100μF and supports PWM converter reference injection without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±0.5% at +25°C - sets precise output voltage threshold for feedback networks |
| Min Cathode Current | 50μA typical - enables regulation in ultra-low-power standby modes (<100μW dissipation) |
| Cathode Voltage Range | 2.495V to 36V - supports wide-output DC-DC converters and industrial 24V/36V rails |
| Dynamic Impedance | 0.1Ω typical - ensures minimal output voltage perturbation under load transients |
| Temp Stability | ±11mV over –40°C to +125°C - maintains regulation accuracy without external trimming |
| Sink Current Range | 100μA to 100mA - accommodates both light-load biasing and full-load error amplification |
| Package | SOT89 - thermally robust surface-mount package with 80°C/W junction-to-case resistance |
Pinout & Package
SOT89 package (Package Code R), 3-pin surface-mount outline with exposed thermal pad. Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. Anode connects to system ground; cathode connects to regulated rail; reference pin interfaces with resistor divider for output voltage programming.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance node (0.2–0.5μA max input current) that senses divided output voltage |
| Pin 2 (ANODE) | Ground Reference | Low-impedance return path tied to system ground; defines common reference for regulation loop |
| Pin 3 (CATHODE) | Regulated Output Node | Sinks adjustable current to maintain VOUT = VREF × (1 + R1/R2); handles up to 100mA |
Key Features
| Feature | Design Value |
|---|---|
| Low minimum cathode current | 50μA typical - reduces quiescent power in always-on auxiliary supplies |
| Programmable output range | 2.495V to 36V - eliminates need for multiple Zener values in multi-rail systems |
| Capacitive load stability | Stable with ≥100μF output capacitance - simplifies EMI filter design in SMPS outputs |
| Thermal drift performance | 11mV max ΔVREF over –40°C to +125°C - avoids calibration in automotive under-hood applications |
| RoHS/Green compliance | Halogen- and antimony-free, lead-free - meets IPC-1752A Class 3 material declarations |
Applications
| USB-C PD Charger | Industrial 24V Switching Supply |
|---|---|
Use Scenario: Regulates 9V/15V/20V output in single-stage flyback converter with optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt reference in secondary-side feedback loop; sets output voltage via resistor divider. Use Value: 50μA min cathode current enables regulation during 50mW no-load standby, reducing total system power by 35% vs. standard TL431. |
Use Scenario: Provides stable 24V output in DIN-rail mounted AC/DC module with wide input range (85–264VAC). IC Role / Device Role / Timing Role: Shunt regulator in primary-side sensing circuit; compensates for transformer turns ratio variation. Use Value: 0.1Ω dynamic impedance minimizes output voltage droop under 10A load steps, improving transient response by 40%. |
| GPU Power Delivery | Smart Meter Voltage Reference |
Use Scenario: Supplies precision 1.2V core voltage reference for GPU VRM controller in graphics cards. IC Role / Device Role / Timing Role: Low-drift shunt reference feeding ADC input of digital power monitor IC. Use Value: ±11mV temp drift over –40°C to +125°C ensures <0.5% measurement accuracy without software correction. |
Use Scenario: Generates stable 2.5V reference for metrology-grade energy measurement IC in ANSI C12.20-compliant meters. IC Role / Device Role / Timing Role: Primary voltage reference source for sigma-delta ADC front-end. Use Value: 0.5% initial tolerance and <0.3μA reference current enable Class 0.2 accuracy over 15-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | 2.495V ref, 1% tolerance, 100μA min cathode current, SOT23 package | Higher min cathode current increases no-load power; smaller SOT23 limits thermal handling | Select when board space is constrained and 1% tolerance suffices; avoid in >1W dissipation scenarios |
| KA431AZTA | 2.5V ref, 2% tolerance, 1mA min cathode current, TO-92 package | Higher min current prevents use in ultra-low-power modes; through-hole mounting limits density | Choose only for legacy through-hole designs or cost-sensitive non-automotive consumer applications |
Compared with TL431BIDBZR and KA431AZTA, AP431SHBRTR-G1 delivers superior low-power regulation (50μA vs. 100μA/1mA), tighter initial tolerance (0.5% vs. 1%/2%), and higher thermal capability (SOT89 vs. SOT23/TO-92), making it optimal for modern compact, high-efficiency power supplies.
Availability
AP431SHBRTR-G1 is available at Aetrix Electronics and suitable for USB-C PD chargers, industrial 24V switching supplies, and smart meter voltage references requiring stable component supply, long-term lifecycle assurance, and RoHS/Green compliance.
Supply support for AP431SHBRTR-G1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and connectivity applications.
The AP431S/AP431SH product line targets high-accuracy, low-power shunt regulation in power supply feedback paths-designed specifically to replace Zener diodes in space-constrained, thermally demanding environments.
FAQ
What is the maximum cathode voltage rating for AP431SHBRTR-G1?
The absolute maximum cathode voltage is 40V, but the recommended operating maximum is 36V. Exceeding 36V risks exceeding the device's safe operating area and may cause thermal runaway or parametric shift. Operation at 36V requires derating power dissipation per the SOT89 thermal resistance (80°C/W) and ambient temperature constraints.
Can AP431SHBRTR-G1 replace TL431 in existing designs without layout changes?
Yes, when using the SOT89 package variant-pinout (REF-ANODE-CATHODE) matches TL431's SOT89 footprint. However, verify minimum cathode current (50μA vs. 1mA for TL431) and adjust feedback resistors to ensure sufficient bias current under all operating conditions, especially light-load and startup.
How does the 0.5% reference voltage tolerance impact output accuracy in a 12V power supply?
With a 2.495V ±0.5% reference and standard resistor divider, the worst-case output error is ±0.5% of 12V = ±60mV. This assumes ideal resistors; adding 1% resistor tolerance increases total error to ±0.7% (±84mV). No additional calibration is needed for most industrial applications meeting ±1% output spec.
Is AP431SHBRTR-G1 qualified for automotive applications?
No-AP431SHBRTR-G1 is not AEC-Q100 qualified. Diodes offers the AP431Q series (e.g., AP431QSHBRTR-G1) for automotive use, featuring extended temperature screening, PPAP documentation, and IATF 16949 manufacturing. For under-hood or safety-critical systems, the Q-grade version must be specified.
AP431SHBRTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-243AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP431SHBRTR-G1 FAQ
1.How can I place an order for AP431SHBRTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431SHBRTR-G1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AP431SHBRTR-G1 reliable?
The price and inventory of AP431SHBRTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431SHBRTR-G1 is usually 5 days.
3.What payment methods are accepted for AP431SHBRTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431SHBRTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431SHBRTR-G1?
AP431SHBRTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431SHBRTR-G1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AP431SHBRTR-G1?
For technical support, including AP431SHBRTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431SHBRTR-G1 requirements.
6.How does Aetrix verify that AP431SHBRTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP431SHBRTR-G1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP431SHBRTR-G1 meets industry standards.
7.What is the process for return or replacement of AP431SHBRTR-G1?
All AP431SHBRTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431SHBRTR-G1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AP431SHBRTR-G1 part is unused and in its original packaging.
Return procedure for AP431SHBRTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431SHBRTR-G1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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