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Diodes Incorporated AS431HAZTR-G1
- Part No.:
- AS431HAZTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AS431HAZTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,805
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Product details
Overview
AS431HAZTR-G1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.5% reference voltage tolerance, 2.495V nominal VREF, and 36V maximum cathode voltage rating. It delivers low temperature coefficient (20 ppm/°C typical), sharp turn-on characteristics, and stable operation from −40°C to +125°C - used as a programmable voltage reference in switching power supplies and battery chargers.
For engineers reviewing the AS431HAZTR-G1 datasheet, AS431HAZTR-G1 pinout, AS431HAZTR-G1 application, or AS431HAZTR-G1 equivalent, key selection criteria include its 0.5% VREF accuracy, 0.15Ω dynamic impedance, 100mA sink current capability, TO92 package thermal resistance (165°C/W), and compatibility with capacitive loads up to 100µF without oscillation.
Technical Context
The AS431HAZTR-G1 functions as a two-input comparator-based shunt regulator: the REF pin senses voltage via external resistor divider, while the cathode sinks current to maintain precise VREF at the reference node. Its internal bandgap reference ensures stable 2.495V output across temperature and line variations.
It operates in continuous regulation mode with cathode current ranging from 0.35mA (minimum for regulation) to 100mA, and exhibits low output noise and high AC stability - validated for load capacitance up to 100µF and small-signal gain flatness below 10kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.495V ±0.5% - sets precise regulation threshold for external resistor network |
| VKA Max | 36V - maximum cathode-to-anode voltage for safe operation in high-voltage feedback loops |
| IKA Range | 0.5–100mA - supports wide output current adjustment in shunt regulator and current source topologies |
| ZKA | 0.15Ω typical - ensures minimal voltage deviation under dynamic load transients |
| Temp Coeff | 20 ppm/°C typical - guarantees ≤16mV total VREF drift over −40°C to +125°C |
| ∆VREF/∆VKA | −0.5 to −2.7 mV/V - quantifies cathode voltage rejection for stable reference under input ripple |
| θJA | 165°C/W (TO92) - defines thermal derating limit for ambient temperatures up to +125°C |
Pinout & Package
AS431HAZTR-G1 is supplied in TO92 (Ammo Packing) package with standard pin-out: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. The package features lead-free, halogen-free "Green" construction and is rated for industrial temperature range (−40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance sensing node for external resistor divider; regulates when voltage equals VREF |
| Pin 2 (CATHODE) | Current Sink Output | Sinks up to 100mA to maintain regulated voltage; connects to supply rail in shunt configuration |
| Pin 3 (ANODE) | Ground Reference | Return path for reference current and cathode sink current; tied to system ground |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.495V to 36V via external resistive divider - enables flexible feedback design without discrete Zener selection |
| Capacitive load stability | Stable with ≥100µF load capacitance - eliminates need for series damping resistors in SMPS feedback networks |
| Low temperature drift | 5mV typical deviation over full temperature range - reduces calibration burden in automotive and industrial systems |
| Low output impedance | 0.15Ω dynamic impedance - maintains regulation accuracy during fast load steps in precision references |
| Wide operating temperature | −40°C to +125°C ambient - qualified for under-hood automotive and industrial power supply applications |
Applications
| Switching Power Supplies | Battery Chargers |
|---|---|
|
Use Scenario: Secondary-side voltage feedback in isolated flyback converters. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise error signal to optocoupler input. Use Value: Enables ±0.5% output regulation accuracy and stable loop response with >100µF compensation capacitance. |
Use Scenario: Constant-voltage stage control in multi-cell Li-ion charger ICs. IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference or comparator threshold setting. Use Value: Maintains <16mV VREF drift over −40°C to +85°C, ensuring consistent charge termination voltage. |
| Voltage Adapters | Graphic Cards |
|
Use Scenario: Low-cost 5V/12V adapter modules requiring tight output tolerance. IC Role / Device Role / Timing Role: Shunt regulator replacing Zener diode in linear post-regulation stage. Use Value: Delivers 0.5% initial accuracy and 20ppm/°C TC - eliminates trimming and improves batch consistency. |
Use Scenario: GPU core voltage monitoring and margining circuits. IC Role / Device Role / Timing Role: High-stability reference for DAC-controlled VRM feedback. Use Value: Supports <±1mV reference stability over temperature, enabling accurate voltage margining within ±1%. |
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 | 2.5V VREF, 2% tolerance, SOIC-8 package, θJA = 130°C/W | Lacks extended temperature rating (−40°C to +125°C); higher VREF drift (50 ppm/°C) | Preferred where cost sensitivity outweighs precision and thermal performance requirements |
| AS431HANTR-G1 | SOT23 package, identical electrical specs, θJA = 380°C/W | Higher thermal resistance limits power dissipation in high-current designs | Selected when PCB space constraints require surface-mount packaging over through-hole TO92 |
Compared with TL431ACDR and AS431HANTR-G1, AS431HAZTR-G1 provides superior thermal performance (165°C/W vs. 380°C/W), tighter VREF tolerance (0.5% vs. 2%), and guaranteed operation to +125°C - making it optimal for high-reliability, thermally constrained, or automotive-adjacent applications.
Availability
AS431HAZTR-G1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and voltage adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.
Supply support for AS431HAZTR-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 high-reliability power management, signal integrity, and protection solutions.
The AS431H product line delivers precision shunt regulators optimized for industrial, computing, and automotive auxiliary power applications - designed to replace Zener diodes with improved accuracy, thermal stability, and load regulation.
FAQ
What is the minimum cathode current required for regulation in AS431HAZTR-G1?
The AS431HAZTR-G1 requires a minimum cathode current of 0.35mA to maintain regulation, verified per datasheet Section 5 (Electrical Characteristics). This value ensures stable reference operation even under light-load conditions in high-impedance feedback networks.
Can AS431HAZTR-G1 be used with large output capacitors without instability?
Yes - the AS431HAZTR-G1 remains stable with load capacitance up to 100µF, as confirmed by stability boundary testing in the datasheet (Figure 12). No series damping resistor is needed, simplifying layout in SMPS feedback paths.
How does the TO92 package affect thermal performance compared to SOT23?
The TO92 package offers θJA = 165°C/W versus 380°C/W for SOT23, enabling higher continuous power dissipation (up to ~350mW at +125°C ambient). This makes AS431HAZTR-G1 more suitable for high-current shunt applications where thermal headroom is critical.
Is AS431HAZTR-G1 qualified for automotive use?
AS431HAZTR-G1 is not AEC-Q100 qualified, but it operates across −40°C to +125°C and meets RoHS/Green standards. For automotive applications, Diodes recommends contacting their sales team for PPAP-capable, IATF 16949-manufactured alternatives.
AS431HAZTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- 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:
- ±0.5%
- 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:
- Through Hole
- Supplier Device Package:
- TO-92
AS431HAZTR-G1 FAQ
1.How can I place an order for AS431HAZTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431HAZTR-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 AS431HAZTR-G1 reliable?
The price and inventory of AS431HAZTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431HAZTR-G1 is usually 5 days.
3.What payment methods are accepted for AS431HAZTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431HAZTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431HAZTR-G1?
AS431HAZTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431HAZTR-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 AS431HAZTR-G1?
For technical support, including AS431HAZTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431HAZTR-G1 requirements.
6.How does Aetrix verify that AS431HAZTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS431HAZTR-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 AS431HAZTR-G1 meets industry standards.
7.What is the process for return or replacement of AS431HAZTR-G1?
All AS431HAZTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431HAZTR-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 AS431HAZTR-G1 part is unused and in its original packaging.
Return procedure for AS431HAZTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431HAZTR-G1 Tags
-
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
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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