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Diodes Incorporated AS431HBZTR-G1
- Part No.:
- AS431HBZTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AS431HBZTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 0.1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:3,249
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Product details
Overview
AS431HBZTR-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, 20ppm/°C typical temperature coefficient, and stable operation from −40°C to +125°C-used in feedback loops of switching power supplies and USB-C chargers requiring accurate voltage regulation.
For engineers reviewing the AS431HBZTR-G1 datasheet, AS431HBZTR-G1 pinout, AS431HBZTR-G1 application, or AS431HBZTR-G1 equivalent, this device serves as a Zener-replacement reference with programmable output (2.495V–36V), low dynamic impedance (0.15Ω typ), and high capacitive-load stability-critical for isolated flyback and QR-PSR adapter designs.
Technical Context
The AS431HBZTR-G1 implements a bandgap-based reference core with internal error amplifier and NPN pass transistor, enabling precise two-resistor voltage programming via the REF terminal. Its sink current range (0.5–100mA) and low output noise support tight regulation in low-power auxiliary rails and optocoupler feedback paths.
Thermal stability is achieved through curvature-compensated bandgap design and matched on-chip resistor ratios, yielding only ±5mV typical VREF deviation across −40°C to +125°C. The device maintains <0.5Ω dynamic impedance up to 100kHz, ensuring minimal AC error in PWM-controlled converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.495V nominal; sets minimum programmable output voltage with 1.0% initial accuracy at 10mA cathode current. |
| VKA max | 36V; maximum cathode-to-anode voltage before regulation loss-supports wide-input adapters and industrial SMPS. |
| ZKA | 0.15Ω typical; low dynamic impedance ensures minimal output voltage ripple under load transients. |
| IKA range | 0.5–100mA; defines usable sink current window for stable regulation-compatible with standard optocoupler LED drive. |
| Temp coeff | 20ppm/°C typical; enables <±10mV total drift over full −40°C to +125°C range-critical for automotive-grade power rails. |
| ΔVREF/ΔVKA | −0.5 to −2.0mV/V; quantifies cathode voltage sensitivity-low value reduces line-regulation error in unregulated inputs. |
| θJA | 165°C/W (TO92); thermal resistance determines max power dissipation (≈215mW at TA=+85°C) without heatsink. |
Pinout & Package
AS431HBZTR-G1 is supplied in TO92 (Ammo Packing) package with lead-free, RoHS-compliant construction. Pin assignment follows standard TO92 orientation: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE (viewed from flat side with leads down).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference input | High-impedance node sensing voltage divider output; sets regulation point when connected between cathode and anode via R1/R2. |
| Pin 2 (CATHODE) | Regulated output sink | Current-sinking terminal delivering precise voltage to external circuitry; connects to optocoupler LED or error amplifier input. |
| Pin 3 (ANODE) | Ground reference | Return path for cathode current; must be tied to system ground or common return to maintain reference integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.495V to 36V using two external resistors-replaces multiple Zener diodes in multi-rail systems. |
| Capacitive-load stability | Stable with ≥100µF load capacitance at VKA = 5–15V-enables direct use in low-ESR ceramic-filtered outputs without compensation. |
| Low temperature drift | ±5mV typical VREF deviation over −40°C to +125°C-meets industrial temperature requirements without calibration. |
| Low quiescent current | 0.7µA typical IREF-minimizes divider network power loss in battery-powered or energy-harvesting applications. |
| High ESD robustness | 2000V HBM rating-reduces risk of field failure during PCB handling and assembly in high-volume manufacturing. |
Applications
| USB-C PD Adapters | Flyback SMPS Feedback |
|---|---|
Use Scenario: Regulating 5V/9V/15V/20V output rails in compact USB-C power adapters with variable load profiles. IC Role / Device Role / Timing Role: Precision shunt reference in optocoupler-coupled secondary-side feedback loop. Use Value: Enables ±1% output accuracy across line/load/temperature with no secondary-side LDO-reducing BOM count and board area. |
Use Scenario: Maintaining tight output regulation in isolated 12V/24V industrial flyback converters operating from 85–264VAC input. IC Role / Device Role / Timing Role: Voltage reference for TL431-compatible feedback network driving optocoupler LED. Use Value: Delivers 20ppm/°C tempco and 0.15Ω ZKA to suppress output ripple below 20mVpp under 50% load step-meeting EN61000-3-2 harmonic limits. |
| Graphic Card VRM Monitoring | Automotive Infotainment Power |
Use Scenario: Providing accurate 1.2V reference for GPU core voltage monitoring and OVP/OCP protection circuits. IC Role / Device Role / Timing Role: Stable reference source for comparator inputs in rail supervision ICs. Use Value: Ensures ±10mV absolute reference accuracy over −40°C to +125°C-preventing false fault triggers during thermal cycling. |
Use Scenario: Regulating 3.3V supply for MCU and CAN transceiver in automotive infotainment head units. IC Role / Device Role / Timing Role: Secondary-side shunt regulator in isolated DC-DC converter powering safety-critical subsystems. Use Value: Qualified per AEC-Q100 Grade 1 (−40°C to +125°C) with 1.0% VREF tolerance-supporting PPAP-compliant production 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 VREF, 0.5% tolerance, SOT23-3 package, higher IKA min (1mA), 0.2Ω ZKA | Requires higher minimum cathode current; less suitable for ultra-low-power optocoupler drive | Select when tighter initial accuracy (0.5%) and SOT23 footprint are prioritized over TO92 cost and thermal mass |
| AS431AZTR-G1 | Same TO92 package, 0.5% VREF tolerance, identical pinout and thermal specs | No functional difference except tighter reference tolerance-no change to external resistor values needed | Choose for applications demanding ±12mV max VREF error over temperature, such as medical-grade power supplies |
Compared with TL431BIDBZR and AS431AZTR-G1, the AS431HBZTR-G1 offers optimal balance of cost, thermal performance (TO92 θJA=165°C/W), and 1.0% tolerance-ideal for high-volume consumer adapters where ±25mV VREF error is acceptable and board space is constrained.
Availability
AS431HBZTR-G1 is available at Aetrix Electronics and suitable for USB-C PD adapters, industrial flyback SMPS, graphic card VRM monitoring, and automotive infotainment power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AS431HBZTR-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, low-drift shunt regulation in isolated power supply feedback networks and voltage supervision circuits.
FAQ
What is the minimum cathode current required for regulation in AS431HBZTR-G1?
The AS431HBZTR-G1 requires a minimum cathode current of 0.35mA (typical) to maintain regulation, with 0.5mA specified as the guaranteed minimum across temperature. This allows reliable operation with high-value feedback resistors-e.g., 1MΩ top resistor at 12V output yields ~11.5mA cathode current, well above threshold.
Can AS431HBZTR-G1 replace TL431 in existing designs?
Yes-AS431HBZTR-G1 is pin-compatible with TL431 in TO92 packages and shares identical electrical behavior: same VREF (2.495V), cathode current range, and dynamic impedance. No circuit changes are needed, though its 1.0% tolerance and lower IREF (0.7µA typ vs. TL431's 2µA) may slightly reduce divider power loss.
Does AS431HBZTR-G1 support capacitive loads without oscillation?
Yes-the device remains stable with ≥100µF ceramic or electrolytic capacitors at cathode, verified across 5V–15V cathode voltages. Its internal compensation eliminates need for external capacitor or resistor in standard feedback configurations, simplifying layout for compact adapters.
What is the thermal resistance and maximum power dissipation for AS431HBZTR-G1?
AS431HBZTR-G1 in TO92 has θJA = 165°C/W. At +85°C ambient, maximum continuous power dissipation is ≈215mW (calculated as (150°C − 85°C)/165°C/W). This supports 100mA sink current at 2.15V drop-sufficient for most optocoupler LED drive and error amplifier biasing applications.
AS431HBZTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- TO-92
AS431HBZTR-G1 FAQ
1.How can I place an order for AS431HBZTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431HBZTR-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 AS431HBZTR-G1 reliable?
The price and inventory of AS431HBZTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431HBZTR-G1 is usually 5 days.
3.What payment methods are accepted for AS431HBZTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431HBZTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431HBZTR-G1?
AS431HBZTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431HBZTR-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 AS431HBZTR-G1?
For technical support, including AS431HBZTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431HBZTR-G1 requirements.
6.How does Aetrix verify that AS431HBZTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS431HBZTR-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 AS431HBZTR-G1 meets industry standards.
7.What is the process for return or replacement of AS431HBZTR-G1?
All AS431HBZTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431HBZTR-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 AS431HBZTR-G1 part is unused and in its original packaging.
Return procedure for AS431HBZTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431HBZTR-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
Microchip Technology
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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
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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