My Inquiry
My Account
Diodes Incorporated AP431SBNTR-G1
- Part No.:
- AP431SBNTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431SBNTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,930
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP431SBNTR-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 from -40°C to +125°C. It replaces Zener diodes in feedback loops of switching power supplies, USB chargers, and voltage adapters where low-power regulation and thermal stability are critical.
For engineers reviewing the AP431SBNTR-G1 datasheet, AP431SBNTR-G1 pinout, AP431SBNTR-G1 application, or AP431SBNTR-G1 equivalent, this device serves as a low-cathode-current, high-stability shunt reference for closed-loop voltage control in compact, thermally constrained DC-DC systems.
Technical Context
The AP431SBNTR-G1 implements a bandgap-referenced error amplifier driving an NPN output stage, enabling precise regulation via external resistor divider between cathode and reference pins. Its sharp turn-on and low temperature coefficient (11 mV deviation over -40°C to +125°C) ensure stable setpoint accuracy across automotive and industrial ambient conditions.
It operates with sink current from 100 µA to 100 mA and maintains stability under capacitive loads up to 100 µF - confirmed by phase margin testing across cathode voltages from 5 V to 15 V. The device requires no external compensation and supports both fixed and programmable output configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±1.0% at +25°C - sets nominal output via R1/R2 divider; enables 2.5 V to 36 V programmable regulation range. |
| Min Cathode Current | 50 µA typical - allows regulation in ultra-low-power standby modes where legacy TL431s require ≥100 µA. |
| Dynamic Impedance | 0.1 Ω typical - minimizes output voltage ripple under fast load transients in SMPS feedback paths. |
| Temp. Drift (ΔVREF) | 11 mV max over -40°C to +125°C - ensures ≤0.44% output variation across full industrial temperature range. |
| Sink Current Range | 100 µA to 100 mA - supports direct drive of optocoupler LEDs or secondary-side error amplifiers without buffering. |
| Max Cathode Voltage | 36 V - compatible with 24 V bus systems and flyback converters with reflected output voltages up to 36 V. |
| Package | SOT23 (Package Code N) - 3-pin surface-mount footprint with 2.3 mm × 2.5 mm body; optimized for high-density PCB layouts. |
Pinout & Package
SOT23 package (Package Code N), 3-pin surface-mount, lead-free and RoHS-compliant. Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance node sensing divided output voltage; draws only 0.2–0.5 µA - enables high-resistor-divider networks to minimize quiescent loss. |
| Pin 2 (ANODE) | Anode Terminal | Connected to system ground or return path; forms current sink path with cathode; must be at lowest potential in circuit. |
| Pin 3 (CATHODE) | Cathode Output | Active output node sinking current into feedback network; voltage here is regulated; drives optocoupler LED or error amp input. |
Key Features
| Feature | Design Value |
|---|---|
| Low Minimum Cathode Current | 50 µA typical - reduces standby power in always-on AC/DC adapters and enables energy harvesting-compatible designs. |
| Programmable Output Range | 2.5 V to 36 V - achieved with two external resistors; eliminates need for multiple Zener values in multi-output supplies. |
| High Capacitive Load Stability | Stable with ≥100 µF output capacitance - avoids oscillation in high-ESR electrolytic or bulk ceramic capacitor configurations. |
| Wide Operating Temperature | -40°C to +125°C - qualified for under-hood automotive auxiliary rails and industrial motor drive control boards. |
| Low Dynamic Impedance | 0.1 Ω typical - suppresses feedback loop noise injection and improves transient response in isolated flyback topologies. |
Applications
| USB-C Charger Feedback | Industrial 24V SMPS |
|---|---|
Use Scenario: Regulates 5 V/9 V/15 V/20 V outputs in single-stage USB PD chargers using optocoupler-isolated feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage setpoint to optocoupler LED; defines output accuracy and load regulation. Use Value: 50 µA min cathode current enables <100 µA standby consumption; 1.0% VREF tolerance ensures ±50 mV output accuracy at 5 V. |
Use Scenario: Secondary-side voltage regulation in 24 V industrial power supplies powering PLC I/O modules and sensors. IC Role / Device Role / Timing Role: Precision shunt element in isolated flyback feedback loop; interfaces with TLV272 comparator or optocoupler driver. Use Value: 11 mV ΔVREF over -40°C to +125°C guarantees ≤±0.46% output drift - meets EN 61000-6-2 immunity requirements. |
| Graphic Card VRM Monitor | Low-Power IoT Adapter |
Use Scenario: Monitors 12 V GPU rail voltage in real time for overvoltage protection and telemetry reporting. IC Role / Device Role / Timing Role: High-accuracy shunt reference feeding ADC input or comparator threshold; operates in parallel with main VRM. Use Value: 0.1 Ω dynamic impedance prevents measurement error during GPU load transients; SOT23 footprint fits tight board space near PCIe slot. |
Use Scenario: Provides regulated 3.3 V bias for BLE SoC and sensor interface in battery-powered smart meters. IC Role / Device Role / Timing Role: Low-quiescent shunt regulator replacing Zener + transistor combo; powers MCU reset supervisor and LDO enable logic. Use Value: 50 µA regulation threshold enables >10-year battery life in coin-cell powered devices; RoHS/Green compliance satisfies EU eco-design directives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 2.495 V reference, 100 µA min cathode current, 0.22 Ω dynamic impedance, SOIC-8 package | Higher quiescent current limits use in sub-100 µA standby systems; larger SOIC footprint increases PCB area | Select when legacy design compatibility or higher sink current (>100 mA) is required; not suitable for space-constrained or ultra-low-power apps. |
| AS431ASTZTR-G1 | 2.500 V reference, 60 µA min cathode current, 0.15 Ω dynamic impedance, SOT23 package, AEC-Q100 Grade 1 | Automotive-qualified; tighter temp drift spec (±8 mV) but higher cost and longer lead time | Select for automotive infotainment or ADAS power rails requiring PPAP documentation and IATF 16949 traceability. |
Compared with TL431ACDR and AS431ASTZTR-G1, the AP431SBNTR-G1 delivers optimal balance of ultra-low regulation current, SOT23 compactness, and industrial-grade thermal stability - making it preferred for cost-sensitive, high-volume consumer and industrial adapters where <100 µA standby matters.
Availability
AP431SBNTR-G1 is available at Aetrix Electronics and suitable for USB-C charger feedback, industrial 24 V SMPS, and low-power IoT adapter designs requiring stable component supply, consistent parametric performance, and RoHS/Green compliance.
Supply support for AP431SBNTR-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 ICs for power management, signal integrity, and connectivity applications.
The AP431S/AP431SH product line delivers precision shunt regulation for cost-sensitive, thermally demanding power conversion systems - designed specifically to replace Zener diodes while improving accuracy, efficiency, and layout density.
FAQ
What is the maximum cathode voltage the AP431SBNTR-G1 can regulate?
The AP431SBNTR-G1 supports cathode voltages up to 36 V under recommended operating conditions, with absolute maximum rating of 40 V. This enables direct use in 24 V industrial bus systems and flyback converters with reflected output voltages ≤36 V without external clamping.
Does AP431SBNTR-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 verified across cathode voltages from 5 V to 15 V and temperatures from -40°C to +125°C per DS39195 Rev. 3-2 Figure 8.
How does the 1.0% reference voltage tolerance affect output accuracy in a 12 V application?
In a 12 V design using R1=100 kΩ and R2=26.1 kΩ, the 1.0% VREF tolerance (±25 mV at 2.5 V) translates to ±120 mV output error at 12 V - well within typical 5% output specification for industrial SMPS and sufficient for non-critical biasing functions.
Can AP431SBNTR-G1 replace TL431 in existing designs without layout changes?
Yes, when using the SOT23 package (N code), AP431SBNTR-G1 is pin-to-pin compatible with TL431 variants in SOT23 - same REF/ANODE/CATHODE pinout, identical footprint, and matching thermal pad absence. No PCB revision is needed beyond verifying cathode current sufficiency.
AP431SBNTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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-23-3
AP431SBNTR-G1 FAQ
1.How can I place an order for AP431SBNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431SBNTR-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 AP431SBNTR-G1 reliable?
The price and inventory of AP431SBNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431SBNTR-G1 is usually 5 days.
3.What payment methods are accepted for AP431SBNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431SBNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431SBNTR-G1?
AP431SBNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431SBNTR-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 AP431SBNTR-G1?
For technical support, including AP431SBNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431SBNTR-G1 requirements.
6.How does Aetrix verify that AP431SBNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP431SBNTR-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 AP431SBNTR-G1 meets industry standards.
7.What is the process for return or replacement of AP431SBNTR-G1?
All AP431SBNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431SBNTR-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 AP431SBNTR-G1 part is unused and in its original packaging.
Return procedure for AP431SBNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431SBNTR-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
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
