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Diodes Incorporated AP431IBRTR-G1
- Part No.:
- AP431IBRTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AP431IBRTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,021
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Product details
Overview
AP431IBRTR-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, and operation up to 36 V cathode voltage. It replaces Zener diodes in feedback loops of switching power supplies, battery chargers, and voltage adapters where low-power, stable voltage reference is required.
For engineers reviewing the AP431IBRTR-G1 datasheet, AP431IBRTR-G1 pinout, AP431IBRTR-G1 application, or AP431IBRTR-G1 equivalent, this device offers verified thermal stability (−40°C to +125°C), 0.1 Ω typical dynamic impedance, and SOT-89 package compatibility - critical for compact, high-reliability DC-DC feedback networks.
Technical Context
The AP431IBRTR-G1 implements a bandgap-based reference amplifier driving an NPN output stage, enabling precise two-resistor programming of output voltage from 2.5 V to 36 V. Its low 50 µA minimum cathode current allows regulation under ultra-low standby loads, unlike standard TL431 variants requiring ≥100 µA.
It features low temperature coefficient (11 mV deviation over −40°C to +125°C), high capacitive load stability, and <1.0 mV/V reference voltage sensitivity to cathode voltage changes - ensuring robust performance across line and load transients in isolated flyback and forward converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±1.0% at +25°C - sets base accuracy for programmable output voltage via external resistor divider |
| Min Cathode Current | 50 µA (typ), 100 µA (max) - enables stable regulation in low-power standby modes and energy-harvesting circuits |
| Dynamic Impedance | 0.1 Ω (typ) - minimizes output voltage perturbation under fast load steps in closed-loop feedback paths |
| Cathode Voltage Range | 2.5 V to 36 V - supports wide-range output programming without external series pass devices |
| Operating Temp | −40°C to +125°C - validated for industrial and automotive under-hood ambient conditions |
| Ref Voltage Drift | 11 mV (typ) over full temp range - ensures <0.44% total reference error across operating envelope |
| Sink Current Range | 100 µA to 100 mA - accommodates both light-load biasing and heavy-duty error amplification duties |
Pinout & Package
AP431IBRTR-G1 is housed in a RoHS-compliant SOT-89 package (Package Code: R), featuring gull-wing leads, 1.5 mm lead pitch, and exposed thermal pad for enhanced power dissipation (θJC = 80°C/W). The package supports surface-mount reflow and is rated for 750 mW power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance input connected to resistor divider midpoint; sets regulation point when voltage equals VREF |
| 2 (ANODE) | Anode Terminal | Connected to system ground or return path; completes internal current sink loop |
| 3 (CATHODE) | Cathode Output | Current-sinking output tied to optocoupler LED or error amplifier input; controls primary-side PWM duty cycle |
Key Features
| Feature | Design Value |
|---|---|
| Low Minimum Cathode Current | 50 µA typical enables stable regulation in <100 µW standby power designs |
| Precise Programmable Output | VOUT = VREF(1 + R1/R2) from 2.5 V to 36 V with ≤1% initial error |
| Thermal Stability | 11 mV max ΔVREF over −40°C to +125°C ensures consistent loop gain across environments |
| Capacitive Load Tolerance | Stable with ≥100 nF output capacitance - eliminates need for external compensation in most SMPS designs |
| Low Dynamic Impedance | 0.1 Ω typical maintains tight voltage regulation during rapid load transients |
Applications
| Switching Power Supply Feedback | Battery Charger Regulation |
|---|---|
|
Use Scenario: Primary-side feedback in isolated flyback converters for AC/DC adapters and USB-PD power bricks. IC Role / Device Role / Timing Role: Shunt regulator providing precise voltage reference to optocoupler LED, closing secondary-to-primary control loop. Use Value: Enables ±1% output voltage accuracy across line/load/temperature while reducing BOM count vs. discrete Zener+transistor solutions. |
Use Scenario: Constant-voltage/constant-current (CV/CC) control in Li-ion battery charging circuits. IC Role / Device Role / Timing Role: Adjustable shunt reference setting charge termination voltage and current limit thresholds. Use Value: 50 µA min cathode current allows accurate CV regulation even during trickle-charge phase with microamp-level bias currents. |
| Voltage Adapter Reference | Graphic Card VRM Monitoring |
|
Use Scenario: Output voltage trimming and monitoring in DC-DC step-down modules for FPGA or ASIC core rails. IC Role / Device Role / Timing Role: Precision reference for external error amplifier or ADC input scaling network. Use Value: 0.1 Ω dynamic impedance prevents reference droop during high-frequency current pulses, preserving ADC measurement fidelity. |
Use Scenario: Real-time rail voltage supervision and overvoltage protection in GPU power delivery subsystems. IC Role / Device Role / Timing Role: Fast-response shunt element triggering protection circuitry upon rail excursion beyond 1.05× nominal. Use Value: Sharp turn-on characteristics and 100 mA sink capability enable sub-microsecond response to overvoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBVR | 1.0% VREF tolerance but requires ≥100 µA min cathode current; higher dynamic impedance (0.2 Ω typ) | Lacks ultra-low standby current capability; less suitable for energy-sensitive applications | Select when legacy design compatibility or TI ecosystem support is prioritized over minimum power consumption |
| AS431ATZTR-E1 | Same 50 µA min cathode current, but 2.5 V ±0.5% tolerance and wider −40°C to +105°C rating | Better initial accuracy but reduced high-temp operational margin vs. AP431IBRTR-G1's +125°C rating | Prefer for cost-sensitive consumer applications where 0.5% accuracy is mandatory and ambient stays below +105°C |
Compared with TL431BIDBVR and AS431ATZTR-E1, AP431IBRTR-G1 uniquely balances 1.0% accuracy, 50 µA regulation threshold, and full industrial temperature range - making it optimal for space-constrained, thermally demanding power management systems requiring low-quiescent design.
Availability
AP431IBRTR-G1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger regulation, and voltage adapter reference applications requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.
Supply support for AP431IBRTR-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
AP431IBRTR-G1 belongs to Diodes' precision shunt regulator product line, engineered specifically for high-stability, low-power feedback control in isolated DC-DC converters and adaptive voltage regulation systems.
FAQ
What is the maximum cathode voltage the AP431IBRTR-G1 can regulate?
The AP431IBRTR-G1 supports cathode voltages up to 36 V under recommended operating conditions, with absolute maximum rating of 40 V. Operation above 36 V risks exceeding thermal limits and degrading long-term reliability, especially in SOT-89 package at elevated ambient temperatures.
Can AP431IBRTR-G1 replace TL431 in existing designs without modification?
Yes, AP431IBRTR-G1 is pin-compatible with TL431 in SOT-89 footprint and shares identical electrical interface (REF/ANODE/CATHODE), but its lower 50 µA minimum cathode current may require verification of bias network stability - particularly in high-impedance divider configurations where TL431's 100 µA requirement previously ensured margin.
Does AP431IBRTR-G1 require external compensation for stability?
No external compensation is needed for typical applications. The device is designed for unconditional stability with capacitive loads up to 100 nF, as confirmed by Diodes' characterization data. For loads >100 nF or high-frequency noise environments, a small series resistor (≤10 Ω) at the cathode improves phase margin without affecting regulation accuracy.
What does the "G1" suffix indicate in AP431IBRTR-G1?
The "G1" suffix denotes Diodes Incorporated's Green compliance designation: fully lead-free, halogen-free (<900 ppm Br/Cl, <1000 ppm Sb), and RoHS 2 (2011/65/EU) compliant. It confirms the part meets stringent environmental standards for industrial and consumer electronics without compromising electrical performance.
AP431IBRTR-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
AP431IBRTR-G1 FAQ
1.How can I place an order for AP431IBRTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431IBRTR-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 AP431IBRTR-G1 reliable?
The price and inventory of AP431IBRTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431IBRTR-G1 is usually 5 days.
3.What payment methods are accepted for AP431IBRTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431IBRTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431IBRTR-G1?
AP431IBRTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431IBRTR-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 AP431IBRTR-G1?
For technical support, including AP431IBRTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431IBRTR-G1 requirements.
6.How does Aetrix verify that AP431IBRTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP431IBRTR-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 AP431IBRTR-G1 meets industry standards.
7.What is the process for return or replacement of AP431IBRTR-G1?
All AP431IBRTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431IBRTR-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 AP431IBRTR-G1 part is unused and in its original packaging.
Return procedure for AP431IBRTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431IBRTR-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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