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Diodes Incorporated AS431HMBNTR-G1
- Part No.:
- AS431HMBNTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AS431HMBNTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,495
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Product details
Overview
AS431HMBNTR-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. It delivers sharp turn-on characteristics, low 20ppm/°C temperature coefficient, and 0.15Ω typical dynamic impedance for stable voltage reference in switching power supplies, chargers, and graphic card VRMs.
For engineers reviewing the AS431HMBNTR-G1 datasheet, AS431HMBNTR-G1 pinout, AS431HMBNTR-G1 application, or AS431HMBNTR-G1 equivalent, this device supports precise programmable output (2.495–36V), operates across –40°C to +125°C, handles 0.5–100mA sink current, maintains low output noise, and offers high stability under capacitive loads up to 100µF.
Technical Context
The AS431HMBNTR-G1 implements a bandgap-based precision reference core with internal error amplifier and NPN pass transistor, enabling adjustable shunt regulation via external resistor divider. Its functional block includes reference, error amplifier, and output stage - no external compensation required for stability with ≤100µF load capacitance.
It operates as a two-quadrant device: sinking cathode current (0.5–100mA) while maintaining regulation across VKA = VREF to 36V, with ∆VREF/∆VKA ≤ –2.7mV/V and off-state cathode leakage <0.5µA at 36V. Thermal resistance is 380°C/W (SOT23) and junction temperature rating is +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (Nominal) | 2.495V - precise internal bandgap reference voltage setting output accuracy baseline |
| Voltage Tolerance | ±1.0% - ensures output setpoint remains within ±25mV of target over initial calibration |
| VKA Max | 36V - maximum cathode-to-anode voltage for safe operation in high-side shunt configurations |
| IKA Range | 0.5mA to 100mA - defines usable sink current window for regulation stability and thermal margin |
| ZKA (Dynamic Impedance) | 0.15Ω typical - enables tight output voltage regulation under fast load transients |
| Temp Coefficient | 20ppm/°C typical - limits reference drift to <0.8mV over –40°C to +125°C full range |
| Operating Temp | –40°C to +125°C - qualified for industrial and extended-temperature embedded power applications |
Pinout & Package
AS431HMBNTR-G1 is packaged in SOT23 (lead-free, green compound) with standard pin-out: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. The package measures 2.3–2.5mm × 1.2–1.4mm × 1.03mm max height and supports reflow soldering per J-STD-020 Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance node connected to external resistor divider; sets regulated output voltage via VOUT = VREF × (1 + R1/R2) |
| Pin 2 (CATHODE) | Regulated Output Node | Sinks current to maintain voltage at REF pin; connects to feedback point in SMPS or linear regulator loops |
| Pin 3 (ANODE) | Current Return Path | Completes shunt path to ground or low-side rail; must be tied to system common reference |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 2.495V to 36V - enables single BOM part to support multiple output rails without redesign |
| Capacitive Load Stability | Stable with ≤100µF - eliminates need for external compensation in most adapter and charger designs |
| Low Temperature Drift | 5mV typical deviation over –40°C to +125°C - reduces calibration overhead in automotive and industrial systems |
| Low Output Noise | Sub-10µV RMS - preserves signal integrity in precision analog sensing and ADC reference paths |
| Lead-Free & Green Compliance | Halogen- and antimony-free, RoHS 3 compliant - meets global environmental compliance requirements without derating |
Applications
| Chargers | Switching Power Supplies |
|---|---|
|
Use Scenario: USB PD and multi-cell Li-ion battery chargers requiring adaptive voltage setpoints. IC Role / Device Role / Timing Role: Adjustable shunt reference in feedback loop of flyback or buck-boost controller ICs. Use Value: Enables ±1.0% output accuracy across temperature and line variations without trimming resistors. |
Use Scenario: Secondary-side voltage regulation in isolated AC/DC adapters for consumer electronics. IC Role / Device Role / Timing Role: Precision voltage reference for optocoupler-coupled feedback networks. Use Value: Maintains stable regulation despite wide input voltage swings and load transients up to 100mA. |
| Graphic Cards | Precision Voltage References |
|
Use Scenario: GPU core voltage (VDDC) and memory voltage (VDDQ) VRM monitoring and trim circuits. IC Role / Device Role / Timing Role: Shunt-based reference for DAC-controlled voltage scaling and margining. Use Value: Delivers 20ppm/°C stability to ensure consistent performance across GPU thermal throttling zones. |
Use Scenario: Calibration-grade references in multimeter front-ends and data acquisition modules. IC Role / Device Role / Timing Role: Primary reference source for 16-bit+ SAR ADCs and instrumentation amplifiers. Use Value: Provides 0.15Ω dynamic impedance to reject supply ripple and maintain <10ppm effective resolution. |
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 | 0.5% VREF tolerance, 37V VKA max, higher 0.2Ω ZKA, 25ppm/°C tempco | Preferred where tighter initial accuracy is critical; less stable under large capacitive loads | Select for lab-grade instruments needing <12mV total error budget at 25°C |
| KA431AZTA | 2% VREF tolerance, TO92 only, 36V VKA, 0.3Ω ZKA, no green/RoHS compliance | Legacy cost-sensitive designs with manual assembly and no environmental compliance requirement | Use only for non-automotive, non-exported products with relaxed accuracy and eco-regulatory needs |
Compared with TL431BIDBVR and KA431AZTA, AS431HMBNTR-G1 provides optimal balance of 1.0% accuracy, SOT23 space efficiency, 20ppm/°C stability, and full RoHS 3/Green compliance - making it ideal for modern compact, thermally demanding, and globally distributed power designs.
Availability
AS431HMBNTR-G1 is available at Aetrix Electronics and suitable for switching power supplies, USB-C chargers, and GPU voltage regulation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AS431HMBNTR-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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AS431H series belongs to Diodes' precision reference product line, engineered specifically for high-stability shunt regulation in compact, thermally constrained power conversion systems.
FAQ
What is the minimum cathode current required for regulation in AS431HMBNTR-G1?
The AS431HMBNTR-G1 requires a minimum cathode current of 0.35mA (typical) and 0.5mA (guaranteed) to maintain regulation. Below this threshold, the device exits active regulation and behaves as an open circuit between cathode and anode. This value is verified across –40°C to +125°C ambient conditions per DS39284 Rev. 2–2.
Can AS431HMBNTR-G1 replace a Zener diode directly in existing designs?
Yes - AS431HMBNTR-G1 replaces standard Zener diodes in shunt regulator topologies using identical 3-pin connections (REF/CATHODE/ANODE). Unlike Zeners, it provides programmable output, lower temperature drift, and improved dynamic impedance without requiring series resistor recalculations beyond the standard VOUT = VREF × (1 + R1/R2) formula.
Does AS431HMBNTR-G1 require external compensation for stability?
No external compensation is required. The AS431HMBNTR-G1 remains stable with load capacitances up to 100µF, as confirmed by small-signal gain and impedance plots in DS39284. Oscillation testing shows no instability at VKA = 5V, 10V, or 15V with capacitive loads up to 100µF at 25°C.
What is the marking code for AS431HMBNTR-G1 on the SOT23 package?
The top-side marking for AS431HMBNTR-G1 is "GM6", followed by a date code (YWWAXX format) and Diodes logo. This matches the ordering information table in DS39284 Rev. 2–2 and is laser-etched on the SOT23 body for traceability and authenticity verification.
AS431HMBNTR-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
AS431HMBNTR-G1 FAQ
1.How can I place an order for AS431HMBNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431HMBNTR-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 AS431HMBNTR-G1 reliable?
The price and inventory of AS431HMBNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431HMBNTR-G1 is usually 5 days.
3.What payment methods are accepted for AS431HMBNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431HMBNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431HMBNTR-G1?
AS431HMBNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431HMBNTR-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 AS431HMBNTR-G1?
For technical support, including AS431HMBNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431HMBNTR-G1 requirements.
6.How does Aetrix verify that AS431HMBNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS431HMBNTR-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 AS431HMBNTR-G1 meets industry standards.
7.What is the process for return or replacement of AS431HMBNTR-G1?
All AS431HMBNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431HMBNTR-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 AS431HMBNTR-G1 part is unused and in its original packaging.
Return procedure for AS431HMBNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431HMBNTR-G1 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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