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Diodes Incorporated AP431SHBNTR-G1
- Part No.:
- AP431SHBNTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431SHBNTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
AP431SHBNTR-G1 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 2.495V reference voltage (±1% tolerance at +25°C), 50μA typical minimum cathode current for regulation, 0.1Ω 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 AP431SHBNTR-G1 datasheet, AP431SHBNTR-G1 pinout, AP431SHBNTR-G1 application, or AP431SHBNTR-G1 equivalent, key selection criteria include its low 50μA regulation threshold, ±11mV reference drift over -40°C to +125°C, 36V max cathode voltage, SOT23-3 package compatibility, and RoHS/Green compliance for high-reliability consumer and industrial power designs.
Technical Context
The AP431SHBNTR-G1 implements a bandgap-based precision reference amplifier driving an NPN output stage, enabling sharp turn-on and stable regulation across capacitive loads up to 100µF without oscillation. Its internal architecture delivers low temperature coefficient (±11mV over full range) and minimal cathode current dependency on voltage or temperature.
It operates as a 3-terminal programmable shunt: REF pin senses voltage via external resistor divider, ANODE connects to system ground, and CATHODE sinks current to regulate output. The device maintains regulation down to 50μA cathode current-enabling use in ultra-low-quiescent-current flyback controllers and battery-powered adapters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1% at +25°C - sets precise output voltage via external R1/R2 divider |
| Min Cathode Current | 50μA typ., 100μA max - enables regulation in <100μA standby power supplies |
| Dynamic Impedance | 0.1Ω typ. - ensures tight output voltage regulation under load transients |
| Ref Voltage Drift | ±11mV over -40°C to +125°C - guarantees stable feedback in automotive/industrial environments |
| Cathode Voltage Range | 2.495V to 36V - supports wide-output DC-DC converters (e.g., 5V, 12V, 24V rails) |
| Sink Current Capacity | 100µA to 100mA - handles both light-load biasing and heavy-load error correction |
| Package | SOT23-3 (Package Code N) - surface-mount, 2.9mm × 1.3mm footprint, JEDEC-compliant |
Pinout & Package
SOT23-3 package (Package Code N), 2.3mm × 1.4mm body, 0.95mm lead pitch, matte tin-plated leads, moisture sensitivity level 3 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance node sensing divided output voltage; draws only 0.2–0.5µA |
| 2 (ANODE) | Anode Terminal | Connected to system ground; forms return path for cathode sink current |
| 3 (CATHODE) | Cathode Output | Sinks adjustable current to maintain REF at 2.495V; connects to primary-side controller feedback |
Key Features
| Feature | Design Value |
|---|---|
| Low regulation threshold | 50μA typical cathode current enables <100μW quiescent dissipation in adapter standby mode |
| Capacitive load stability | Stable with ≥100µF output capacitance - eliminates need for external compensation in SMPS feedback |
| Precision reference | 2.495V ±1% initial tolerance and ±11mV total drift - reduces output voltage calibration effort |
| Wide operating range | -40°C to +125°C ambient - qualified for under-hood automotive charging modules and industrial PSUs |
| Green compliance | Totally lead-free, halogen- and antimony-free - meets IPC-1752A Class 2 reporting and EU RoHS 3 |
Applications
| USB-C PD Adapters | Industrial 24V Switching Supplies |
|---|---|
|
Use Scenario: Regulating 9V/15V/20V outputs in compact USB-C power adapters with <300mW no-load consumption. IC Role / Device Role / Timing Role: Primary-side shunt regulator providing isolated feedback signal to PWM controller via optocoupler. Use Value: 50μA min cathode current allows direct optocoupler LED drive without auxiliary winding, reducing BOM count by one component. |
Use Scenario: Voltage setting and loop compensation in 24V/5A industrial switch-mode power supplies operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: Precision shunt reference in secondary-side feedback network, stabilizing output against line/load/temperature variation. Use Value: ±11mV reference drift over -40°C to +125°C ensures ≤±0.5% output voltage deviation across full thermal range. |
| Laptop AC Adapters | Graphic Card VRMs |
|
Use Scenario: Feedback regulation in 19.5V/3.33A laptop adapters requiring tight 1% output tolerance and CE/UL62368-1 compliance. IC Role / Device Role / Timing Role: Adjustable shunt regulator establishing accurate 19.5V output via resistor divider, interfacing with TL431-compatible optocoupler circuits. Use Value: Pinout and electrical compatibility with TL431 simplifies drop-in replacement while lowering standby power by 40%. |
Use Scenario: Reference voltage source for multi-phase GPU voltage regulator modules requiring fast transient response and low noise. IC Role / Device Role / Timing Role: Low-impedance (0.1Ω) shunt reference supplying stable 1.2V or 0.9V reference to digital PWM controllers. Use Value: 0.1Ω dynamic impedance minimizes output voltage perturbation during 10A/µs load steps, improving VRM phase alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.495V ref, ±1% tol, but 100μA min cathode current (2× higher than AP431SHBNTR-G1) | Requires larger bias resistor or auxiliary winding to meet regulation threshold in ultra-low-power adapters | Select when legacy TL431 footprint compatibility is mandatory and >100μA standby current is acceptable |
| AS431ASTZTR-G1 | 2.500V ref, ±0.5% tol, 60μA min cathode current, same SOT23-3 package | Higher initial accuracy but slightly higher regulation current; identical thermal drift performance | Select when tighter initial tolerance is prioritized over absolute lowest standby power |
Compared with TL431ACDBVR and AS431ASTZTR-G1, the AP431SHBNTR-G1 offers the lowest regulation threshold (50μA) in SOT23-3, enabling simpler, lower-cost feedback networks in energy-sensitive USB-C and IoT power adapters without sacrificing thermal stability or RoHS compliance.
Availability
AP431SHBNTR-G1 is available at Aetrix Electronics and suitable for USB-C PD adapters, industrial 24V switching supplies, and laptop AC adapters requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.
Supply support for AP431SHBNTR-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 regulators optimized for energy-efficient switching power supplies, battery chargers, and industrial power systems where low quiescent current and thermal stability are essential.
FAQ
What is the maximum cathode voltage rating for AP431SHBNTR-G1?
The AP431SHBNTR-G1 has an absolute maximum cathode-to-anode voltage (VKA) rating of 40V, with recommended continuous operation up to 36V. Exceeding 36V risks exceeding power dissipation limits in SOT23-3 packaging, especially above 85°C ambient. Derating curves in DS39195 Rev. 3-2 confirm safe operation at 36V with ≤100mA cathode current below 100°C junction temperature.
Can AP431SHBNTR-G1 replace TL431 in existing designs?
Yes - AP431SHBNTR-G1 is pin-compatible with TL431 in SOT23-3 (N-code) packages and matches its 2.495V reference and 1% tolerance. However, its 50μA minimum cathode current is half that of standard TL431 (100μA), allowing direct replacement without modifying bias resistors in most cases, though verification of loop stability under light load is recommended.
Does AP431SHBNTR-G1 require external compensation for stability?
No external compensation is required. The device maintains stability with capacitive loads up to 100µF, as verified in DS39195 Figure 12 (stability boundary conditions). This eliminates series resistance or capacitor across REF-ANODE needed with older shunt regulators, simplifying PCB layout and reducing component count in SMPS feedback networks.
What is the thermal resistance (θJA) of AP431SHBNTR-G1 in SOT23-3?
The datasheet specifies θJC = 140°C/W for SOT23-3, but θJA depends on PCB layout. With standard 1-inch² 2-oz copper pad (JEDEC 51-7), typical θJA is ~220°C/W. For 100mA cathode current at 36V, power dissipation reaches 3.6W - requiring thermal relief traces or copper pour to limit junction temperature rise to <100°C above ambient.
AP431SHBNTR-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
AP431SHBNTR-G1 FAQ
1.How can I place an order for AP431SHBNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431SHBNTR-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 AP431SHBNTR-G1 reliable?
The price and inventory of AP431SHBNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431SHBNTR-G1 is usually 5 days.
3.What payment methods are accepted for AP431SHBNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431SHBNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431SHBNTR-G1?
AP431SHBNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431SHBNTR-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 AP431SHBNTR-G1?
For technical support, including AP431SHBNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431SHBNTR-G1 requirements.
6.How does Aetrix verify that AP431SHBNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP431SHBNTR-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 AP431SHBNTR-G1 meets industry standards.
7.What is the process for return or replacement of AP431SHBNTR-G1?
All AP431SHBNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431SHBNTR-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 AP431SHBNTR-G1 part is unused and in its original packaging.
Return procedure for AP431SHBNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431SHBNTR-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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