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Diodes Incorporated AS431BZTR-G1
- Part No.:
- AS431BZTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AS431BZTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,875
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Product details
Overview
AS431BZTR-G1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1.0% reference voltage tolerance, 2.5V to 36V programmable output range, 0.15Ω typical dynamic impedance, -40°C to +125°C operating temperature, and TO92 (Ammo Packing) package. It replaces Zener diodes in switching power supplies, battery chargers, and precision voltage references where thermal stability and low output impedance are critical.
For engineers reviewing the AS431BZTR-G1 datasheet, AS431BZTR-G1 pinout, AS431BZTR-G1 application, or AS431BZTR-G1 equivalent, this device serves as a thermally stable, adjustable 2.5V reference with sharp turn-on, low temperature coefficient (20 ppm/°C typ), and high capacitive load stability-key for feedback loop design in DC-DC converters and adapter circuits.
Technical Context
The AS431BZTR-G1 implements a bandgap-based reference core with internal error amplifier and output transistor, enabling precise cathode-to-anode regulation via external resistor divider. Its functional block includes reference voltage generation, error amplification, and current-sinking output stage with guaranteed operation up to 100mA sink current.
It operates in shunt mode with cathode voltage ranging from VREF (2.5V) to 36V, requiring only two external resistors to set output voltage. The device maintains regulation down to 0.4mA minimum cathode current and exhibits <4.5mV typical reference voltage deviation over full -40°C to +125°C range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500V ±1.0% - sets base reference accuracy for output voltage calculation via R1/R2 divider |
| VKA Range | 2.5V to 36V - defines usable cathode voltage window for adjustable regulation |
| ZKA | 0.15Ω typical - ensures minimal output voltage variation under load transients |
| IKA Range | 1.0mA to 100mA - specifies stable regulation current envelope for feedback network design |
| Temp Coefficient | 20 ppm/°C typical - guarantees ≤±0.75mV drift over 0–100°C ambient change |
| ∆VREF/∆VKA | -0.5 to -2.0 mV/V - quantifies cathode voltage sensitivity affecting reference stability in high-VKA applications |
| Operating Temp | -40°C to +125°C - supports industrial and automotive under-hood environments without derating |
Pinout & Package
AS431BZTR-G1 is supplied in TO92 (Ammo Packing) package with 3 leads: Anode (Pin 1), Cathode (Pin 2), Reference (Pin 3). Pin 2 is internally connected to substrate and must be connected to cathode node or left open per datasheet Note 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode connection | Reference ground return path; connects to system GND or feedback divider low-side |
| Pin 2 (Cathode) | Cathode connection | Main current sink terminal; ties to output node of regulated supply or PWM controller feedback |
| Pin 3 (Ref) | Reference input | Sense point for feedback divider; determines regulated output voltage via VOUT = VREF × (1 + R1/R2) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5V to 36V via external resistor divider - enables single BOM part across multiple output rails |
| Thermal stability | 4.5mV typical ∆VREF over -40°C to +125°C - eliminates need for external temperature compensation |
| Capacitive load immunity | Stable with ≥100µF load capacitance - supports direct use in noisy switcher outputs without added phase compensation |
| Low quiescent current | 0.7µA typical IREF - minimizes divider bias current error in high-resistance feedback networks |
| RoHS & Green compliance | Halogen- and antimony-free, <900ppm Br/Cl, <1000ppm Sb - meets IPC-1752A Class 3 environmental requirements |
Applications
| Charger Feedback Loop | Switching Power Supply Reference |
|---|---|
|
Use Scenario: Used in constant-voltage stage of Li-ion battery charger ICs to regulate output at 4.2V or 8.4V. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise feedback to primary-side controller or secondary-side optocoupler driver. Use Value: Enables ±1% output accuracy over temperature without trimming, reducing BOM count vs. fixed Zener + op-amp solutions. |
Use Scenario: Implements TL431-style feedback in isolated flyback or forward converters delivering 5V/12V/24V outputs. IC Role / Device Role / Timing Role: Precision voltage reference generating error signal for PWM duty cycle control via optocoupler-coupled feedback path. Use Value: Delivers 0.15Ω dynamic impedance to suppress ripple-induced feedback noise, improving transient response by >30% vs. standard Zeners. |
| Voltage Adapter Regulation | Graphics Card VRM Monitoring |
|
Use Scenario: Regulates auxiliary 3.3V or 5V rail in USB-C PD adapters with wide input range (9–20V). IC Role / Device Role / Timing Role: Shunt regulator establishing stable reference for secondary-side error amplifier in buck-derived topologies. Use Value: Maintains regulation down to 0.4mA cathode current, allowing ultra-low-power standby operation without dropout. |
Use Scenario: Monitors GPU core voltage (0.8–1.3V) via resistor divider scaling, feeding analog comparator or ADC input. IC Role / Device Role / Timing Role: Precision 2.5V reference source for voltage margining and fault detection circuitry on high-performance graphics cards. Use Value: 20 ppm/°C tempco ensures <±2mV reference drift over 0–85°C GPU junction range, enabling accurate ±10mV fault thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 0.5% VREF tolerance, SOT23-5 package, 2.495V nominal VREF, higher IREF (1µA max) | Requires 5-pin layout; better for space-constrained PCBs but lacks TO92 mechanical compatibility | Select when tighter initial accuracy (±0.5%) and smaller footprint are prioritized over through-hole assembly |
| KA431AZTA | 1.0% VREF tolerance, TO92 package, 2.5V nominal VREF, higher ZKA (0.3Ω typ), wider IKA range (1–100mA) | Same mechanical fit but lower dynamic impedance performance; suitable for non-critical regulation | Choose for cost-sensitive designs where 0.15Ω ZKA is not required and legacy KA431 sourcing is preferred |
Compared with TL431ACDBVR and KA431AZTA, AS431BZTR-G1 offers superior thermal stability (4.5mV drift vs. 6–8mV), lower dynamic impedance (0.15Ω vs. 0.3Ω), and RoHS/Green compliance out-of-box-making it optimal for new industrial power designs requiring long-term calibration integrity.
Availability
AS431BZTR-G1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and precision voltage reference circuits requiring stable component supply, extended temperature operation, and lead-free compliance.
Supply support for AS431BZTR-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 devices for industrial, computing, and consumer markets.
The AS431 belongs to Diodes' precision reference product line, designed specifically for high-stability shunt regulation in power conversion feedback paths where Zener replacement with improved thermal and dynamic performance is required.
FAQ
What is the minimum cathode current required for regulation in AS431BZTR-G1?
The AS431BZTR-G1 requires a minimum cathode current of 0.4mA to maintain regulation, as specified in the Electrical Characteristics table under IKA(Min). This value ensures stable reference operation even in low-power standby modes of power supplies and adapters, where feedback divider currents are minimized to reduce quiescent loss.
Can AS431BZTR-G1 replace a standard 2.5V Zener diode directly?
Yes, AS431BZTR-G1 can directly replace a 2.5V Zener diode in shunt regulator configurations, but requires two external resistors to set output voltage. Unlike passive Zeners, it provides active regulation with sharp turn-on, lower dynamic impedance (0.15Ω vs. >10Ω), and guaranteed thermal stability-eliminating need for series resistor tuning or temperature compensation.
What is the maximum cathode voltage rating for AS431BZTR-G1?
The absolute maximum cathode voltage (VKA) for AS431BZTR-G1 is 40V, per Absolute Maximum Ratings. However, the recommended operating range limits VKA to 36V to ensure guaranteed regulation performance and thermal reliability. Exceeding 36V may cause increased reference drift or reduced lifetime, especially at elevated temperatures.
Is AS431BZTR-G1 compatible with ceramic output capacitors?
Yes, AS431BZTR-G1 is stable with ceramic output capacitors up to 100µF, as confirmed in the Stability Boundary Conditions vs. Load Capacitance plot. Its low output impedance and internal compensation eliminate oscillation risk commonly seen with Zener diodes and ceramic caps, enabling compact, low-ESR filtering in modern switcher designs without added damping components.
AS431BZTR-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):
- 2.5V
- 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:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
AS431BZTR-G1 FAQ
1.How can I place an order for AS431BZTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431BZTR-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 AS431BZTR-G1 reliable?
The price and inventory of AS431BZTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431BZTR-G1 is usually 5 days.
3.What payment methods are accepted for AS431BZTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431BZTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431BZTR-G1?
AS431BZTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431BZTR-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 AS431BZTR-G1?
For technical support, including AS431BZTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431BZTR-G1 requirements.
6.How does Aetrix verify that AS431BZTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS431BZTR-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 AS431BZTR-G1 meets industry standards.
7.What is the process for return or replacement of AS431BZTR-G1?
All AS431BZTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431BZTR-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 AS431BZTR-G1 part is unused and in its original packaging.
Return procedure for AS431BZTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431BZTR-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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