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Diodes Incorporated AS431HBNTR-G1
- Part No.:
- AS431HBNTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AS431HBNTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 0.1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
AS431HBNTR-G1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1.0% reference voltage tolerance, 2.495V nominal VREF, and 36V maximum cathode voltage rating. It delivers sharp turn-on characteristics, low output impedance (0.15Ω typical), and stable operation from –40°C to +125°C - used in feedback loops of switching power supplies, USB chargers, and precision voltage references.
For engineers reviewing the AS431HBNTR-G1 datasheet, AS431HBNTR-G1 pinout, AS431HBNTR-G1 application, or AS431HBNTR-G1 equivalent, key selection criteria include its programmable 2.495–36V output range, ±5mV max VREF drift over temperature, 0.5–100mA sink current capability, and SOT23 package compatibility with high-density PCB layouts.
Technical Context
The AS431HBNTR-G1 functions as a two-input, one-output precision voltage comparator driving an internal NPN pass transistor - the REF pin senses external resistor divider voltage, while the CATHODE sinks current to regulate system output. Its architecture enables direct replacement of Zener diodes without sacrificing thermal stability or dynamic response.
It operates across full industrial temperature range (–40°C to +125°C) with guaranteed 20ppm/°C typical temperature coefficient and <0.5Ω dynamic impedance up to 100kHz, supporting stable regulation under capacitive loads up to 100µF without oscillation - verified per Figure 8 in DS39284 Rev. 2-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (Nominal) | 2.495V - precise internal bandgap reference enabling accurate output programming via external resistors |
| Voltage Tolerance | ±1.0% - ensures output accuracy within ±25mV at 2.5V setting, critical for tight-regulation SMPS feedback |
| VKA Max | 36V - supports regulation in 24V industrial rails and 32V automotive auxiliary supplies |
| IKA Range | 0.5mA to 100mA - accommodates low-power biasing and high-current error amplification in multi-output converters |
| ZKA (Dynamic Impedance) | 0.15Ω typical - minimizes load-induced output deviation during transient events in closed-loop systems |
| Temp Coefficient | 20ppm/°C typical - limits VREF drift to <0.8mV over 0–70°C, preserving ADC reference integrity |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
AS431HBNTR-G1 is supplied in the SOT23-3L package (2.3 × 1.2 × 1.0mm), RoHS-compliant, matte tin-plated leads, moisture sensitivity level 3. Pin assignments follow standard "Normal" pin-out configuration per ordering code BNTR-G1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current return path | Connected to system ground or low-side return; completes shunt current loop |
| Pin 2 (Cathode) | Regulated output node | Sinks adjustable current to maintain VREF at REF pin; connects to SMPS feedback node or error amp input |
| Pin 3 (Ref) | Precision voltage sense input | Monitors resistor-divider voltage; triggers regulation when ≥2.495V; high-impedance (0.7µA typ IREF) |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.495V to 36V via two-resistor divider - eliminates need for multiple Zener values in BOM |
| Low temperature drift | ±5mV max over –40°C to +125°C - maintains regulation accuracy without external compensation |
| Capacitive load stability | Stable with ≥100µF output capacitance - enables use with bulk electrolytics in cost-sensitive adapters |
| Low noise & high PSRR | Sub-10µVpp output noise and >60dB PSRR at 1kHz - preserves signal integrity in analog sensor interfaces |
| High sink current capacity | 100mA continuous - drives optocoupler LEDs directly in isolated flyback feedback paths |
Applications
| USB-C PD Chargers | Industrial 24V SMPS |
|---|---|
|
Use Scenario: Regulating 5–20V output in programmable USB-C Power Delivery adapters with variable output negotiation. IC Role / Device Role / Timing Role: Adjustable shunt reference in optocoupler-coupled secondary-side feedback loop. Use Value: Enables single-component VREF programming across full PD profile range (±1.0% tolerance ensures compliance with USB-IF voltage window specs). |
Use Scenario: Providing stable 3.3V/5V auxiliary rail in DIN-rail mounted 24V-to-12V/5V DC-DC modules. IC Role / Device Role / Timing Role: Precision voltage reference for TL431-replacement feedback in isolated forward converters. Use Value: 125°C rating and 20ppm/°C TC ensure consistent regulation across ambient extremes in factory automation enclosures. |
| GPU Voltage Reference | Automotive Body Control Module |
|
Use Scenario: Generating clean 1.2V reference for GPU core voltage DACs in high-end graphics cards. IC Role / Device Role / Timing Role: Low-noise shunt regulator supplying reference to digital-to-analog converter. Use Value: 0.15Ω ZKA and sub-10µVpp noise prevent DAC quantization errors under dynamic GPU load transients. |
Use Scenario: Regulating 5V supply for LIN transceivers and microcontroller peripherals in BCMs. IC Role / Device Role / Timing Role: Secondary-side voltage reference in isolated buck-boost converter powering safety-critical subsystems. Use Value: AEC-Q200 alignment (via Diodes' automotive qualification pathway) and –40°C startup support cold-cranking reliability. |
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 | 2.495V VREF, ±0.5% tolerance, SO-8 package, higher ZKA (0.22Ω min) | Larger footprint; requires external capacitor for stability above 10µF | Select for tighter initial accuracy where board space permits SO-8 mounting |
| AS431HANTR-G1 | Same SOT23-3 package, but ±0.5% VREF tolerance and lower temp drift (±5mV vs ±16mV over –40°C to +125°C) | Higher cost; preferred where long-term calibration stability is critical | Select when system-level accuracy budget demands <±10mV total VREF error over full temperature range |
Compared with TL431BIDBVR and AS431HANTR-G1, AS431HBNTR-G1 offers optimal balance of SOT23 compactness, 1.0% accuracy, and proven capacitive-load stability - making it ideal for cost-sensitive, space-constrained industrial and consumer power designs where ±25mV VREF error is acceptable.
Availability
AS431HBNTR-G1 is available at Aetrix Electronics and suitable for USB-C PD chargers, industrial 24V SMPS, and automotive body control modules requiring stable component supply with full traceability and lifecycle continuity.
Supply support for AS431HBNTR-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The AS431H series belongs to Diodes' precision reference product line, engineered specifically for high-stability, low-drift shunt regulation in power conversion feedback paths - targeting cost-effective replacement of Zener diodes in industrial, computing, and automotive applications.
FAQ
What is the minimum cathode current required for regulation in AS431HBNTR-G1?
The AS431HBNTR-G1 requires a minimum cathode current of 0.35mA (typical) and 0.5mA (guaranteed) to maintain regulation. This value is specified in the Electrical Characteristics table under "IKA (Min)" at TA = +25°C. Operation below this threshold may result in loss of reference accuracy or unstable output voltage.
Can AS431HBNTR-G1 replace a standard Zener diode directly in existing circuits?
Yes - AS431HBNTR-G1 can directly replace Zener diodes rated between 2.5V and 36V by connecting REF to the Zener cathode node and Anode to ground. Its sharp turn-on and low dynamic impedance eliminate Zener's soft knee and high impedance issues, improving regulation accuracy and transient response without circuit redesign.
Does AS431HBNTR-G1 require an external capacitor for stability?
No external capacitor is required for basic stability. The device remains stable with output capacitances up to 100µF, as confirmed in Figure 8 of DS39284 Rev. 2-2. However, for systems with >100µF bulk capacitance or high ESR electrolytics, a 1nF ceramic capacitor from REF to Anode is recommended to suppress high-frequency peaking.
What is the marking code for AS431HBNTR-G1 on the SOT23 package?
The top-side marking for AS431HBNTR-G1 is "GJB", followed by a date code (e.g., "2328" for week 28 of 2023) and assembly house code. This matches the "Marking ID" column in the Ordering Information table on page 10 of DS39284 Rev. 2-2, confirming traceability to the 1.0% tolerance, SOT23, normal pin-out variant.
AS431HBNTR-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):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- 4µA
- Current - Cathode:
- 500 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AS431HBNTR-G1 FAQ
1.How can I place an order for AS431HBNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431HBNTR-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 AS431HBNTR-G1 reliable?
The price and inventory of AS431HBNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431HBNTR-G1 is usually 5 days.
3.What payment methods are accepted for AS431HBNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431HBNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431HBNTR-G1?
AS431HBNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431HBNTR-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 AS431HBNTR-G1?
For technical support, including AS431HBNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431HBNTR-G1 requirements.
6.How does Aetrix verify that AS431HBNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS431HBNTR-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 AS431HBNTR-G1 meets industry standards.
7.What is the process for return or replacement of AS431HBNTR-G1?
All AS431HBNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431HBNTR-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 AS431HBNTR-G1 part is unused and in its original packaging.
Return procedure for AS431HBNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431HBNTR-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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