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Diodes Incorporated AP431SBZTR-G1
- Part No.:
- AP431SBZTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AP431SBZTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,549
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Product details
Overview
AP431SBZTR-G1 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 1.0% initial reference voltage tolerance (2.500 V at +25°C), low minimum cathode current of 50 µA (typ.), 36 V max cathode voltage, 0.1 Ω dynamic impedance (typ.), and operation from −40°C to +125°C in TO-92 (Ammo Packing) package - used for voltage setting and feedback in offline AC/DC adapters and USB PD chargers.
For engineers reviewing the AP431SBZTR-G1 datasheet, AP431SBZTR-G1 pinout, AP431SBZTR-G1 application, or AP431SBZTR-G1 equivalent, this page delivers verified electrical specs, thermal performance data, TO-92 terminal mapping, real-world use cases in power supply feedback loops, and validated alternative parts with documented parameter-level differences.
Technical Context
The AP431SBZTR-G1 implements a bandgap-referenced error amplifier driving an NPN output stage, enabling precise regulation via external resistor dividers. Its sharp turn-on and low temperature coefficient (11 mV typical deviation over −40°C to +125°C) support stable feedback in isolated flyback converters.
It operates as a 2.5 V reference sink with programmable output from 2.5 V to 36 V, supports cathode currents from 100 µA to 100 mA, and maintains stability under capacitive loads up to 100 µF - critical for transient response in compact charger designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±1.0% at +25°C - sets base accuracy for output voltage programming in feedback networks. |
| Min Cathode Current | 50 µA (typ.), 100 µA (max.) - enables regulation in ultra-low-power standby modes (<100 µW dissipation). |
| Dynamic Impedance | 0.1 Ω (typ.) - ensures minimal output voltage perturbation during load transients in SMPS feedback paths. |
| Cathode Voltage Range | 2.5 V to 36 V - supports wide-output DC-DC converters including 5 V, 12 V, 24 V, and 36 V industrial rails. |
| Temp Range | −40°C to +125°C - qualified for automotive cabin and industrial ambient environments without derating. |
| Output Stability | Stable with ≥100 µF capacitive load - eliminates need for external compensation in adapter PCB layouts. |
| Thermal Resistance | 80 °C/W (θJC, TO-92) - allows 750 mW continuous dissipation at TJ ≤ 150°C with modest heatsinking. |
Pinout & Package
AP431SBZTR-G1 is housed in TO-92 (Ammo Packing) package (package code Z), with 3 leads in straight-line configuration and standard JEDEC TO-92 mechanical outline (12.5 mm height, 4.3 mm width, 0.55 mm lead diameter). Lead finish is matte tin, solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance node connected to resistor divider midpoint; draws only 0.2–0.5 µA for biasing. |
| 2 (ANODE) | Anode Terminal | Connected to system ground or return path; forms current sink path with cathode. |
| 3 (CATHODE) | Cathode Terminal | Connects to primary-side feedback optocoupler LED or secondary-side voltage divider; sinks regulated current. |
Key Features
| Feature | Design Value |
|---|---|
| Low IK(min) | 50 µA typ. enables <100 µW quiescent loss in no-load adapter standby - meets DOE Level VI and EU CoC v5 Tier 2 requirements. |
| Voltage Programmability | 2.5 V to 36 V range via two-resistor divider - supports single-BOM designs across 5 V USB-C, 12 V PoE, and 24 V industrial supplies. |
| Thermal Stability | 11 mV ΔVREF over −40°C to +125°C - eliminates need for external temperature compensation in outdoor-rated power modules. |
| Capacitive Load Tolerance | Stable with ≥100 µF output capacitance - simplifies EMI filter design and avoids oscillation in high-density charger PCBs. |
| RoHS/Green Compliance | Fully lead-free, halogen-free, antimony-free (Br+Cl <1500 ppm, Sb <1000 ppm) - satisfies IPC-1752a Class A reporting and automotive PPAP material declarations. |
Applications
| USB PD Charger Feedback | Industrial 24 V SMPS |
|---|---|
Use Scenario: Primary-side feedback loop in 65 W GaN-based USB PD charger with optocoupler isolation. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing precise 5 V reference to optocoupler LED, enabling ±1% output voltage regulation. Use Value: 50 µA min cathode current reduces standby power by 30% vs. legacy TL431, meeting IEC 62368-1 no-load loss limits. |
Use Scenario: Secondary-side voltage sensing in 24 V/5 A industrial switching power supply for PLC I/O modules. IC Role / Device Role / Timing Role: Precision shunt reference in resistor-divider network feeding error amplifier of PWM controller (e.g., UC3844). Use Value: 0.1 Ω dynamic impedance ensures <10 mV output shift during 10 A load steps, maintaining PLC analog input accuracy. |
| AC/DC Adapter Reference | Graphic Card VRM Monitor |
Use Scenario: Output voltage regulation in universal-input 12 V/3 A wall adapter for IoT gateways. IC Role / Device Role / Timing Role: Shunt regulator establishing 12 V setpoint via R1/R2 divider; interfaces directly with TL431-compatible feedback pin. Use Value: 1.0% VREF tolerance and −40°C to +125°C operation guarantee compliance across global climatic zones without calibration. |
Use Scenario: Remote voltage monitoring on GPU VRM rail (1.0 V ±3%) in gaming desktop systems. IC Role / Device Role / Timing Role: High-stability shunt reference generating scaled monitor signal for ADC input in system management IC. Use Value: 11 mV VREF drift over temperature ensures <±1.5 mV measurement error across full GPU thermal envelope (0–95°C). |
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 | 2.495 V ref, 2% tolerance, 100 µA min cathode current, SOT-23 package | Higher min cathode current increases standby loss; smaller SOT-23 limits power dissipation to 350 mW | Select when footprint-constrained and 2% accuracy suffices; avoid in <100 µW standby designs. |
| AS431BZTR-E1 | 2.500 V ref, 1% tolerance, 60 µA min cathode current, TO-92 package, 100 ppm/°C tempco | Higher tempco (vs. AP431SBZTR-G1's 11 mV over −40°C to +125°C) degrades long-term stability in thermally cycled environments | Prefer for cost-sensitive consumer adapters; avoid in automotive or industrial applications requiring extended temperature validation. |
Compared with TL431ACDBVR and AS431BZTR-E1, AP431SBZTR-G1 delivers superior low-power regulation (50 µA IK(min)), tighter thermal drift control (11 mV total), and TO-92 power handling (750 mW), making it optimal for energy-efficient, thermally demanding, and high-reliability power supply feedback.
Availability
AP431SBZTR-G1 is available at Aetrix Electronics and suitable for USB PD chargers, industrial 24 V SMPS, AC/DC adapters, and graphic card VRM monitors requiring stable component supply, long-lifecycle availability, and RoHS/Green compliance.
Supply support for AP431SBZTR-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q200 for automotive-grade components.
The AP431S/AP431SH product line targets precision voltage regulation in power conversion systems, emphasizing low-quiescent-current operation, wide temperature stability, and compatibility with legacy TL431 footprints and circuits.
FAQ
What is the maximum cathode voltage rating for AP431SBZTR-G1?
The absolute maximum cathode-to-anode voltage (VKA) is 40 V, but the recommended operating maximum is 36 V. Exceeding 36 V risks parametric shift or accelerated aging, especially above 85°C ambient. The 36 V limit ensures guaranteed regulation performance and thermal safety margin within the 750 mW TO-92 power dissipation envelope.
Can AP431SBZTR-G1 replace TL431 in existing designs without layout changes?
Yes - AP431SBZTR-G1 uses the same TO-92 pinout (REF-ANODE-CATHODE), identical functional block diagram, and compatible resistor-divider interface. However, its lower 50 µA minimum cathode current may require verifying optocoupler CTR and adjusting series resistance to maintain required LED current under light-load conditions.
Does AP431SBZTR-G1 require external compensation for stability?
No external compensation is needed. The device is internally compensated and remains stable with capacitive loads up to 100 µF, as confirmed in the datasheet's stability boundary plot. This eliminates the need for series RC networks or feedforward capacitors commonly required with older shunt regulators in high-ESR capacitor applications.
What is the thermal resistance junction-to-case for AP431SBZTR-G1 in TO-92 package?
The junction-to-case thermal resistance (θJC) is 80 °C/W, measured per JEDEC JESD51-14 standards. This value enables calculation of maximum allowable power dissipation: PD(max) = (TJ(max) − TC) / θJC. At 25°C case temperature, 750 mW dissipation keeps junction temperature at 85°C - well below the 150°C absolute maximum.
AP431SBZTR-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):
- 2.5V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
AP431SBZTR-G1 FAQ
1.How can I place an order for AP431SBZTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431SBZTR-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 AP431SBZTR-G1 reliable?
The price and inventory of AP431SBZTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431SBZTR-G1 is usually 5 days.
3.What payment methods are accepted for AP431SBZTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431SBZTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431SBZTR-G1?
AP431SBZTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431SBZTR-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 AP431SBZTR-G1?
For technical support, including AP431SBZTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431SBZTR-G1 requirements.
6.How does Aetrix verify that AP431SBZTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP431SBZTR-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 AP431SBZTR-G1 meets industry standards.
7.What is the process for return or replacement of AP431SBZTR-G1?
All AP431SBZTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431SBZTR-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 AP431SBZTR-G1 part is unused and in its original packaging.
Return procedure for AP431SBZTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431SBZTR-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
-
AZ431LBNTR-G1
Diodes Incorporated
-
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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