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Diodes Incorporated AP431SHARTR-G1
- Part No.:
- AP431SHARTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AP431SHARTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:950
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Product details
Overview
AP431SHARTR-G1 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 0.5% initial reference voltage tolerance (2.495 V), low 50 µA typical minimum cathode current for regulation, 0.1 Ω typical dynamic impedance, and operation up to 36 V cathode voltage - used as a Zener diode replacement in feedback loops of switching power supplies and USB-C chargers.
For engineers reviewing the AP431SHARTR-G1 datasheet, AP431SHARTR-G1 pinout, AP431SHARTR-G1 application, or AP431SHARTR-G1 equivalent, key selection criteria include cathode current threshold, reference voltage drift over temperature (±11 mV from −40°C to +125°C), thermal resistance (80°C/W in SOT89), and RoHS/Green compliance for high-reliability industrial and consumer power designs.
Technical Context
The AP431SHARTR-G1 implements a bandgap-based precision reference amplifier driving an NPN output stage, enabling sharp turn-on and stable regulation across capacitive loads up to 100 µF without oscillation. Its internal architecture supports programmable output voltages from 2.495 V to 36 V via external resistor dividers.
It operates over −40°C to +125°C ambient, maintains <0.3 µA reference current deviation across that range, and delivers sink current from 100 µA to 100 mA while holding dynamic impedance below 0.3 Ω - critical for tight-loop feedback stability in PWM converters and adapter ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±0.5% at +25°C - sets precise feedback threshold for output voltage programming |
| Min Cathode Current | 50 µA typ., 100 µA max - enables regulation in ultra-low-power standby modes |
| Dynamic Impedance | 0.1 Ω typ. - ensures minimal output voltage perturbation under fast load transients |
| Voltage Range | 2.495 V to 36 V programmable - supports wide-range DC-DC output adjustment without external op-amps |
| Temp Drift (ΔVREF) | ±11 mV max from −40°C to +125°C - guarantees <0.44% total reference error across full industrial range |
| Thermal Resistance (θJC) | 80°C/W (SOT89) - allows 750 mW power dissipation with ≤60°C junction rise above case |
| ESD Rating | 5.5 kV HBM - protects against handling damage during board assembly and rework |
Pinout & Package
SOT89 package (Package Code R), 3-pin surface-mount, with exposed thermal pad for enhanced heat dissipation. Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference input | High-impedance node sensing divider voltage; draws only 0.2–0.5 µA - minimizes bias error in high-R feedback networks |
| Pin 2 (ANODE) | Current return path | Connected to system ground or negative rail; carries full cathode current minus reference current |
| Pin 3 (CATHODE) | Regulated output node | Sinks adjustable current to maintain REF at 2.495 V; directly interfaces with optocoupler LED or error amplifier input |
Key Features
| Feature | Design Value |
|---|---|
| Low minimum cathode current | 50 µA typical - enables regulation in <100 µW auxiliary supplies (e.g., QR flyback startup circuits) |
| Precision reference tolerance | ±0.5% at +25°C - reduces need for post-production trimming in 5 V/12 V adapter production |
| Capacitive load stability | Stable with ≥100 µF output capacitance - eliminates need for series damping resistors in bulk-capacitor-filtered outputs |
| Wide temperature performance | ±11 mV ΔVREF over −40°C to +125°C - ensures consistent loop gain in automotive cabin modules and industrial PLCs |
| Green packaging | RoHS 3 / halogen-free / antimony-free - meets IPC-1752A reporting requirements for Tier 1 automotive BOMs |
Applications
| USB-C PD Adapters | Industrial SMPS Feedback |
|---|---|
Use Scenario: Regulating 5–20 V output in compact USB-C power adapters with variable load profiles. IC Role / Device Role / Timing Role: Shunt regulator providing precise voltage reference to optocoupler-driven primary-side controller. Use Value: 50 µA min cathode current enables zero-load regulation; 0.1 Ω dynamic impedance suppresses ripple-induced jitter in feedback path. |
Use Scenario: Closed-loop voltage control in 24 V/48 V industrial switch-mode power supplies operating in harsh ambient conditions. IC Role / Device Role / Timing Role: Precision shunt reference in secondary-side error amplifier circuit, interfacing with TL431-compatible optocouplers. Use Value: ±11 mV reference drift ensures <±0.3% output accuracy over −40°C to +125°C, eliminating recalibration in field-deployed equipment. |
| Graphic Card VRM Monitoring | Programmable Bench Power Supply |
Use Scenario: Real-time voltage margining and fault detection on GPU core voltage rails (0.8–1.2 V). IC Role / Device Role / Timing Role: Adjustable shunt element in DAC-controlled feedback divider for fine-grained output voltage tuning. Use Value: 2.495 V reference with 0.5% tolerance enables ±5 mV absolute setting resolution at 1.0 V output via 1% resistors. |
Use Scenario: User-adjustable 1.25–30 V bench supply with digital encoder-based voltage control. IC Role / Device Role / Timing Role: Programmable shunt reference replacing fixed Zener, enabling smooth analog voltage sweep without discrete tap changes. Use Value: 36 V max cathode voltage headroom supports 30 V output with 10% safety margin; SOT89 thermal pad sustains 750 mW during 1 A short-circuit test. |
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 | 2.495 V ref, ±1% tolerance, 100 µA min cathode current, 0.2 Ω dynamic impedance | Higher min cathode current increases quiescent loss in ultra-low-power adapters | Select when cost sensitivity outweighs efficiency needs and ±1% tolerance is acceptable |
| AS431ASTZTR-G1 | 2.500 V ref, ±0.5% tolerance, 60 µA min cathode current, 0.15 Ω dynamic impedance, same SOT89 package | Near-identical electrical specs but different marking and traceability chain; not AEC-Q200 qualified | Choose for second-source assurance where Diodes' supply continuity is constrained |
Compared with TL431ACDR and AS431ASTZTR-G1, AP431SHARTR-G1 delivers tighter reference tolerance (±0.5% vs ±1%), lower regulation threshold (50 µA vs 100 µA), and superior thermal resistance (80°C/W vs 100°C/W in SOT89), making it optimal for space-constrained, high-efficiency, and extended-temperature applications.
Availability
AP431SHARTR-G1 is available at Aetrix Electronics and suitable for USB-C power adapters, industrial switch-mode power supplies, and programmable bench power supplies requiring stable component supply, long-term lifecycle support, and RoHS 3 compliance.
Supply support for AP431SHARTR-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 AP431S/AP431SH product line targets high-accuracy, low-quiescent-current shunt regulation in space- and efficiency-constrained power systems - designed specifically to replace Zener diodes in feedback paths where thermal stability and low minimum cathode current are critical.
FAQ
What is the maximum cathode voltage the AP431SHARTR-G1 can regulate?
The AP431SHARTR-G1 supports cathode voltages up to 36 V under recommended operating conditions, with absolute maximum rating of 40 V. This allows direct use in 24 V and 36 V industrial power rails without external clamping, provided power dissipation remains within the 750 mW SOT89 limit.
How does the 50 µA minimum cathode current affect circuit design?
The 50 µA typical minimum cathode current enables reliable regulation even when feedback network currents fall below 100 µA - critical for high-resistance voltage dividers in energy-harvesting or battery-backed systems. It eliminates the need for auxiliary bias windings or leakage compensation resistors in flyback converters.
Can AP431SHARTR-G1 replace TL431 in existing designs?
Yes - AP431SHARTR-G1 is pin-compatible with TL431 in SOT89 and offers identical functional behavior, but with improved specifications: tighter reference tolerance (±0.5% vs ±1%), lower min cathode current (50 µA vs 100 µA), and better thermal resistance. No layout change is required for drop-in replacement.
Is AP431SHARTR-G1 qualified for automotive applications?
AP431SHARTR-G1 is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AP431SHAQTR-G1) with PPAP capability and IATF 16949 manufacturing - contact Diodes or Aetrix for qualified alternatives if used in vehicle cabin, infotainment, or ADAS subsystems.
AP431SHARTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-243AA
- 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:
- ±0.5%
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP431SHARTR-G1 FAQ
1.How can I place an order for AP431SHARTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431SHARTR-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 AP431SHARTR-G1 reliable?
The price and inventory of AP431SHARTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431SHARTR-G1 is usually 5 days.
3.What payment methods are accepted for AP431SHARTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431SHARTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431SHARTR-G1?
AP431SHARTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431SHARTR-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 AP431SHARTR-G1?
For technical support, including AP431SHARTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431SHARTR-G1 requirements.
6.How does Aetrix verify that AP431SHARTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP431SHARTR-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 AP431SHARTR-G1 meets industry standards.
7.What is the process for return or replacement of AP431SHARTR-G1?
All AP431SHARTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431SHARTR-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 AP431SHARTR-G1 part is unused and in its original packaging.
Return procedure for AP431SHARTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431SHARTR-G1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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