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Diodes Incorporated AP431SBRTR-G1
- Part No.:
- AP431SBRTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AP431SBRTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,130
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Product details
Overview
AP431SBRTR-G1 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 1.0% initial reference voltage tolerance (2.500 V at +25°C), 50 µA typical minimum cathode current for regulation, 0.1 Ω typical dynamic impedance, and operation up to 36 V cathode voltage. It replaces Zener diodes in feedback loops of switching power supplies, USB chargers, and voltage adapters requiring low-power, thermally stable voltage references.
For engineers reviewing the AP431SBRTR-G1 datasheet, AP431SBRTR-G1 pinout, AP431SBRTR-G1 application, or AP431SBRTR-G1 equivalent, this device offers verified low-cathode-current regulation, high-temperature stability (–40°C to +125°C), and SOT89 package compatibility for space-constrained power control designs.
Technical Context
The AP431SBRTR-G1 implements a bandgap-referenced error amplifier driving an NPN output stage, enabling precise shunt regulation via external resistor divider feedback on the REF pin. Its sharp turn-on and low temperature coefficient (11 mV typical deviation over –40°C to +125°C) ensure stable setpoint accuracy across automotive and industrial ambient conditions.
It operates as a 2.5 V programmable shunt reference with sink current capability from 100 µA to 100 mA, supporting both low-power biasing and higher-current error-signal injection into PWM controllers. The device maintains stability under capacitive loads up to 100 µF without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±1.0% at +25°C - sets output voltage via R1/R2 divider with minimal drift over temperature |
| Min Cathode Current | 50 µA (typ.), 100 µA (max) - enables regulation in ultra-low-power standby or light-load modes |
| Dynamic Impedance | 0.1 Ω (typ.) - ensures tight output voltage regulation under fast load transients |
| Cathode Voltage Range | 2.5 V to 36 V - supports wide-input DC-DC converters and adapter applications |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and industrial power supply environments |
| Thermal Resistance (θJC) | 80°C/W (SOT89) - enables reliable thermal dissipation up to 750 mW in compact layouts |
| Output Stability | Stable with ≥100 µF capacitive load - eliminates need for external phase compensation in most designs |
Pinout & Package
SOT89-3 package (Package Code: R), surface-mount, thermally enhanced with exposed collector tab. Dimensions: 4.40 × 4.60 × 1.20 mm (L × W × H); weight: 0.0561 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance node connected to resistor divider midpoint; sets regulated output voltage via VOUT = VREF(1 + R1/R2) |
| 2 (ANODE) | Anode Terminal | Connected to system ground or return path; completes shunt current loop through external load |
| 3 (CATHODE) | Cathode Terminal | Connected to regulated output node; sinks adjustable current to maintain VREF at REF pin |
Key Features
| Feature | Design Value |
|---|---|
| Low regulation threshold current | 50 µA typical - reduces quiescent power loss in battery-backed or energy-harvesting systems |
| Precision reference stability | 11 mV max ΔVREF over –40°C to +125°C - eliminates recalibration in wide-temperature deployments |
| High sink current capacity | 100 mA max cathode current - supports direct interface with optocoupler LEDs or PWM controller feedback pins |
| Robust capacitive load immunity | Stable with ≥100 µF output capacitance - simplifies EMI filter design and avoids oscillation in SMPS feedback paths |
| Green packaging compliance | Halogen- and antimony-free, RoHS 3 compliant (≤900 ppm Br/Cl, ≤1000 ppm Sb) - meets global environmental directives |
Applications
| USB-C Power Delivery Adapter | Laptop AC-DC Adapter |
|---|---|
Use Scenario: Regulates 20 V output in flyback converter feedback loop with optocoupler isolation. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise 2.5 V reference to optocoupler LED cathode. Use Value: Enables ±1% output voltage accuracy across line/load/temperature while consuming only 50 µA in no-load mode. |
Use Scenario: Sets 19.5 V output in QR flyback design with secondary-side synchronous rectification. IC Role / Device Role / Timing Role: Precision voltage reference in isolated feedback network controlling PWM duty cycle. Use Value: Maintains stable regulation during cold-start (-40°C) and full-load thermal stress (+125°C case temp) without drift compensation. |
| Gaming Graphics Card VRM | Industrial PLC Power Module |
Use Scenario: Provides 1.2 V GPU core voltage reference in multi-phase buck converter with digital controller. IC Role / Device Role / Timing Role: Secondary-side shunt reference for analog monitoring and fault detection circuitry. Use Value: Delivers 0.1 Ω dynamic impedance to reject noise coupling from high-dv/dt GPU switching events. |
Use Scenario: Supplies stable 5 V reference for analog sensor signal conditioning in 24 V DC-powered PLC I/O module. IC Role / Device Role / Timing Role: Low-drift shunt regulator powering precision op-amps and ADC reference buffers. Use Value: Achieves <12 mV total reference error over –40°C to +85°C operating range, meeting IEC 61000-6-2 immunity requirements. |
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 | 2.495 V reference, 100 µA min cathode current, SO-8 package, higher θJA (210°C/W) | Requires larger PCB area; less suitable for thermally constrained SMT layouts | Select when SO-8 footprint is already standardized and higher thermal resistance is acceptable |
| KA431AZTA | 2.5 V reference, 1% tolerance, TO-92 package, 600 µA min cathode current | Larger through-hole footprint; unsuitable for automated SMT assembly | Choose only for legacy through-hole designs where rework to SMT is not feasible |
Compared with TL431BIDBZR and KA431AZTA, AP431SBRTR-G1 delivers lower regulation current (50 µA vs. 100 µA/600 µA), superior thermal performance (80°C/W vs. 210°C/W/120°C/W), and SOT89 compatibility-making it optimal for modern compact, high-efficiency power supplies.
Availability
AP431SBRTR-G1 is available at Aetrix Electronics and suitable for USB-C PD adapters, laptop AC-DC adapters, and industrial PLC power modules requiring stable component supply, long-term lifecycle support, and RoHS 3-compliant sourcing.
Supply support for AP431SBRTR-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 manufacturer specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The AP431S/AP431SH series was designed specifically for high-accuracy, low-quiescent-current shunt regulation in isolated switch-mode power supplies and portable charging systems.
FAQ
What is the maximum cathode voltage rating for AP431SBRTR-G1?
The absolute maximum cathode-to-anode voltage (VKA) is 40 V, but the recommended operating maximum is 36 V. Exceeding 36 V risks violating the device's safe operating area and may cause thermal runaway or parametric shift. Operation at 36 V requires derating power dissipation per the SOT89 thermal resistance (80°C/W) and ambient temperature constraints.
Can AP431SBRTR-G1 replace a standard TL431 in existing designs?
Yes, AP431SBRTR-G1 is pin-compatible with TL431 in SOT89 footprint and shares identical electrical functionality. However, its 50 µA minimum cathode current is significantly lower than TL431's typical 1 mA, so existing resistor dividers may require adjustment to ensure sufficient cathode current under all operating conditions, especially at light loads.
Does AP431SBRTR-G1 require external compensation for stability?
No external compensation is required. The device is internally compensated and remains stable with capacitive loads up to 100 µF, as confirmed by Diodes' application testing. This eliminates the need for series RC networks or damping resistors commonly used with older shunt regulators in SMPS feedback paths.
Is AP431SBRTR-G1 qualified for automotive applications?
AP431SBRTR-G1 is not AEC-Q100 qualified. While it operates across –40°C to +125°C and meets RoHS 3, automotive-grade qualification (e.g., PPAP, IATF 16949 manufacturing, stress testing) requires specific part variants-contact Diodes Incorporated directly for AEC-compliant alternatives such as the AP431SHxQ series.
AP431SBRTR-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
AP431SBRTR-G1 FAQ
1.How can I place an order for AP431SBRTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431SBRTR-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 AP431SBRTR-G1 reliable?
The price and inventory of AP431SBRTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431SBRTR-G1 is usually 5 days.
3.What payment methods are accepted for AP431SBRTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431SBRTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431SBRTR-G1?
AP431SBRTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431SBRTR-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 AP431SBRTR-G1?
For technical support, including AP431SBRTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431SBRTR-G1 requirements.
6.How does Aetrix verify that AP431SBRTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP431SBRTR-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 AP431SBRTR-G1 meets industry standards.
7.What is the process for return or replacement of AP431SBRTR-G1?
All AP431SBRTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431SBRTR-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 AP431SBRTR-G1 part is unused and in its original packaging.
Return procedure for AP431SBRTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431SBRTR-G1 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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