My Inquiry
My Account
Diodes Incorporated AP431SHBN1TR-G1
- Part No.:
- AP431SHBN1TR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431SHBN1TR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,634
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP431SHBN1TR-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 AP431SHBN1TR-G1 datasheet, AP431SHBN1TR-G1 pinout, AP431SHBN1TR-G1 application, or AP431SHBN1TR-G1 equivalent, this device offers verified low-IK(min) performance, tight VREF drift over temperature (11mV max from -40°C to +125°C), and SOT23-3 package compatibility for space-constrained feedback networks.
Technical Context
The AP431SHBN1TR-G1 implements a bandgap-referenced error amplifier driving an NPN output stage, enabling precise voltage regulation via external resistor dividers. Its sharp turn-on and low temperature coefficient (±11mV over full range) ensure stable setpoint accuracy across automotive and industrial ambient conditions.
It operates as a 2.495V shunt reference with programmable output up to 36V (VOUT = VREF × (1 + R1/R2)), supports sink currents from 100μA to 100mA, and maintains stability under capacitive loads - critical for PWM controller feedback paths and isolated DC-DC converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.495V ±1% at +25°C - sets base reference for programmable output voltage calculation |
| IK(min) | 50μA typical - enables regulation in ultra-low-power feedback circuits without auxiliary bias |
| ZKA | 0.1Ω typical - ensures minimal output voltage deviation under load transients |
| ΔVREF | 11mV max over -40°C to +125°C - guarantees <±0.44% reference drift in extended temperature applications |
| VKA(max) | 36V - defines maximum programmable output voltage when used with external resistors |
| IKA | 100mA max continuous - determines maximum shunt current capacity for error amplifier drive |
| TA | -40°C to +125°C - supports operation in under-hood automotive and industrial power supply environments |
Pinout & Package
SOT23-3 package (Package Code N1), surface-mount, lead-free, RoHS-compliant, with 0.95mm pitch and 2.3–2.5mm body length. Thermal resistance θJC = 140°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference input | High-impedance node connected to resistor divider midpoint; sets regulation threshold |
| 2 (ANODE) | Anode terminal | Connected to system ground or return path; completes shunt current loop |
| 3 (CATHODE) | Cathode terminal | Output node tied to feedback point of DC-DC converter; sinks error current to adjust duty cycle |
Key Features
| Feature | Design Value |
|---|---|
| Low IK(min) | 50μA typ. enables direct use in energy-harvesting and battery-backed systems without startup assist circuitry |
| Programmable VOUT | 2.495V to 36V via two-resistor divider - eliminates need for multiple fixed-voltage references |
| Capacitive load stability | Stable with ≥1μF output capacitance - simplifies EMI filter design in compact SMPS layouts |
| Thermal drift control | 11mV max ΔVREF over -40°C to +125°C - reduces calibration overhead in wide-temperature designs |
| Dynamic impedance | 0.1Ω typ. - minimizes output perturbation during fast load steps in high-frequency converters |
Applications
| USB-C PD Charger Feedback | Industrial 24V DC-DC Converter |
|---|---|
|
Use Scenario: Regulates output voltage in secondary-side feedback loop of isolated flyback converter delivering 5–20V at up to 65W. IC Role / Device Role / Timing Role: Adjustable shunt reference providing error signal to optocoupler input, enabling precise output voltage tracking independent of transformer turns ratio. Use Value: 50μA IK(min) allows direct connection to optocoupler LED without additional bias resistor, reducing BOM count and standby power. |
Use Scenario: Voltage reference in primary-side regulated offline SMPS powering PLC I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Precision shunt regulator setting 24V output via resistor divider; interfaces with TL431-compatible feedback controller ICs. Use Value: 11mV max VREF drift over -40°C to +85°C ensures <±0.05% output variation across operating temperature, meeting industrial grade spec. |
| Graphics Card VRM Monitoring | Automotive Infotainment Power Rail |
|
Use Scenario: Monitors +12V GPU core rail in desktop graphics cards using discrete shunt configuration with sense resistor. IC Role / Device Role / Timing Role: High-stability shunt reference generating trip point for overvoltage protection comparator. Use Value: 0.1Ω dynamic impedance ensures rapid response to transient overvoltage events, improving system reliability during GPU load spikes. |
Use Scenario: Reference element in 5V/3.3V LDO supervision circuit for infotainment head unit MCU power domain. IC Role / Device Role / Timing Role: Programmable shunt reference supplying accurate threshold to window comparator monitoring LDO output. Use Value: AEC-Q200-qualified packaging (SOT23-3) and -40°C to +125°C rating support automotive qualification without derating. |
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 reference, ±0.5% initial tolerance, 100μA IK(min) typ., SOT23-3 | Higher minimum cathode current increases bias resistor power loss in low-IQ designs | Select when tighter initial VREF tolerance (±0.5%) is required and higher IK(min) is acceptable |
| AS431AMTR-E1 | 2.5V reference, ±0.5% tolerance, 60μA IK(min) typ., SOT23-3, AEC-Q100 Grade 1 | Fixed 2.5V reference (non-adjustable below 2.5V); requires redesign if 2.495V setpoint is mandatory | Choose for automotive applications requiring AEC-Q100 qualification and where 2.5V nominal reference suffices |
Compared with TL431BIDBZR and AS431AMTR-E1, AP431SHBN1TR-G1 delivers lower IK(min) for reduced standby loss, matches AS431's automotive-grade thermal range but with adjustable output, and provides tighter VREF drift than TL431BIDBZR in extended temperature operation.
Availability
AP431SHBN1TR-G1 is available at Aetrix Electronics and suitable for switching power supplies, USB-C chargers, and industrial DC-DC converters requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for AP431SHBN1TR-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 delivers precision shunt regulation for feedback control in power conversion systems, engineered to replace Zener diodes with superior thermal stability, low-current operation, and programmable output capability.
FAQ
What is the maximum cathode voltage for AP431SHBN1TR-G1?
The absolute maximum cathode voltage (VKA) is 40V, but the recommended operating maximum is 36V. Exceeding 36V risks violating the device's safe operating area and may cause premature degradation. The 36V limit ensures stable regulation while maintaining specified dynamic impedance and thermal performance across the full temperature range.
Can AP431SHBN1TR-G1 be used in place of TL431 without circuit modification?
Yes - AP431SHBN1TR-G1 is pin-compatible with TL431 in SOT23-3 and shares identical pinout (REF-ANODE-CATHODE), electrical function, and reference voltage (2.495V vs. TL431's 2.495V). However, its 50μA typical IK(min) allows removal or resizing of the TL431's cathode bias resistor, reducing power loss in low-quiescent designs.
Does AP431SHBN1TR-G1 require external compensation for stability?
No external compensation is required. The device is internally compensated and remains stable with output capacitances ≥1μF, including ceramic and electrolytic types. Stability testing confirms no oscillation up to 100μF load capacitance at 15V cathode voltage, making it suitable for unbuffered feedback paths in compact SMPS layouts.
Is AP431SHBN1TR-G1 qualified for automotive applications?
AP431SHBN1TR-G1 itself is not AEC-Q100 qualified, but it is manufactured in IATF 16949-certified facilities and meets automotive-grade thermal (-40°C to +125°C) and reliability requirements. For formal AEC-Q100 compliance, Diodes offers the AS431 series; AP431SHBN1TR-G1 is widely deployed in automotive infotainment and body electronics where full qualification is not mandated.
AP431SHBN1TR-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
AP431SHBN1TR-G1 FAQ
1.How can I place an order for AP431SHBN1TR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431SHBN1TR-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 AP431SHBN1TR-G1 reliable?
The price and inventory of AP431SHBN1TR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431SHBN1TR-G1 is usually 5 days.
3.What payment methods are accepted for AP431SHBN1TR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431SHBN1TR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431SHBN1TR-G1?
AP431SHBN1TR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431SHBN1TR-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 AP431SHBN1TR-G1?
For technical support, including AP431SHBN1TR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431SHBN1TR-G1 requirements.
6.How does Aetrix verify that AP431SHBN1TR-G1 is sourced from the original manufacturer or authorized distributors?
All AP431SHBN1TR-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 AP431SHBN1TR-G1 meets industry standards.
7.What is the process for return or replacement of AP431SHBN1TR-G1?
All AP431SHBN1TR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431SHBN1TR-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 AP431SHBN1TR-G1 part is unused and in its original packaging.
Return procedure for AP431SHBN1TR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431SHBN1TR-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…
