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Diodes Incorporated AP431SHAN1TR-G1
- Part No.:
- AP431SHAN1TR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431SHAN1TR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:31,280
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Product details
Overview
AP431SHAN1TR-G1 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 0.5% initial reference voltage tolerance (2.495 V), 50 µA typical minimum cathode current for regulation, 0.1 Ω typical dynamic impedance, and operation from −40°C to +125°C. It replaces Zener diodes in feedback loops of switching power supplies, USB chargers, and precision voltage references where low-power regulation and thermal stability are critical.
For engineers reviewing the AP431SHAN1TR-G1 datasheet, AP431SHAN1TR-G1 pinout, AP431SHAN1TR-G1 application, or AP431SHAN1TR-G1 equivalent, this device is selected for its ultra-low cathode current requirement, tight reference voltage accuracy across temperature, and stable performance under capacitive loads in isolated feedback networks.
Technical Context
The AP431SHAN1TR-G1 implements a bandgap-referenced error amplifier with high-gain transconductance output stage, enabling precise regulation via external resistor dividers. Its internal architecture delivers sharp turn-on characteristics and low temperature coefficient (11 mV typical deviation over −40°C to +125°C).
It operates as a 2.495 V reference sink with programmable output voltage from 2.495 V to 36 V, supporting cathode currents from 100 µA to 100 mA while maintaining <0.3 Ω dynamic impedance and stable phase margin up to 10 µF load capacitance.
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 typical - enables regulation in ultra-low-power standby or light-load modes |
| Dynamic Impedance | 0.1 Ω typical - ensures minimal output voltage perturbation under fast load transients |
| Temp Range | −40°C to +125°C - supports industrial and automotive under-hood applications |
| Output Voltage Range | 2.495 V to 36 V - configured via external R1/R2 divider without additional components |
| Ref Voltage Drift | 11 mV typical over full temp range - maintains <0.44% total error in closed-loop systems |
| Sink Current Range | 100 µA to 100 mA - accommodates both signal-level biasing and power-stage feedback control |
Pinout & Package
SOT23-3 (Package Code N1) surface-mount package with 100% matte tin-plated leads, moisture sensitivity level 3 per J-STD-020, and 0.009 g mass.
| 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 |
| 2 (ANODE) | Anode terminal | Connected to system ground or return path; completes shunt current loop |
| 3 (CATHODE) | Cathode terminal | Sinks regulated current into feedback node; voltage here determines output setpoint |
Key Features
| Feature | Design Value |
|---|---|
| Low min cathode current | 50 µA typ. - reduces quiescent loss in always-on auxiliary supplies |
| Precision reference | 2.495 V ±0.5% - eliminates need for post-production trimming in mid-volume designs |
| Capacitive load stability | Stable with ≤10 µF - simplifies EMI filter integration without phase compensation |
| Thermal drift control | 11 mV max ΔVREF over −40°C to +125°C - maintains regulation accuracy without external calibration |
| Lead-free & green | RoHS 3 compliant, halogen/antimony free - meets IPC-1752A reporting and EU SCIP requirements |
Applications
| USB-C PD Adapters | Industrial PLC Power Rails |
|---|---|
|
Use Scenario: Secondary-side voltage feedback in 65 W USB-C power adapters with variable output (5–20 V). IC Role / Device Role / Timing Role: Adjustable shunt regulator providing isolated feedback signal to primary-side controller via optocoupler. Use Value: 50 µA min cathode current enables regulation during 5 V/100 mA standby mode without auxiliary winding or LDO. |
Use Scenario: Precision 24 V rail monitoring and overvoltage protection in modular I/O backplanes. IC Role / Device Role / Timing Role: Reference element in comparator-based fault detection circuit with hysteresis. Use Value: 0.1 Ω dynamic impedance ensures <10 mV step response error during transient surges up to 10 A/ms. |
| Server PSU VRM Sensing | Automotive Infotainment DC-DC |
|
Use Scenario: Remote sensing of 1.8 V core voltage on high-current CPU VRMs with PCB trace resistance compensation. IC Role / Device Role / Timing Role: Programmable reference in differential remote-sense amplifier feedback network. Use Value: 2.495 V ±0.5% reference enables ±1% total output accuracy despite 50 mΩ sense path resistance. |
Use Scenario: Feedback regulation of 5 V USB hub supply in head-unit DC-DC converters operating at 125°C ambient. IC Role / Device Role / Timing Role: Temperature-stable shunt reference in secondary-side TL431 replacement circuit. Use Value: 11 mV reference drift over −40°C to +125°C ensures <±0.3% output variation without software correction. |
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 | 2.5 V ±0.5%, 100 µA min cathode current, −40°C to +125°C, SOT23-3 | Higher min cathode current increases standby loss in battery-backed systems | Select when legacy design compatibility or TI ecosystem tooling is required |
| AS431ASTZTR-G1 | 2.495 V ±0.5%, 60 µA min cathode current, −40°C to +105°C, SOT23-3 | Reduced temperature range limits use in under-hood automotive modules | Select for cost-sensitive consumer power supplies where 105°C rating suffices |
Compared with TL431ACDBVR and AS431ASTZTR-G1, the AP431SHAN1TR-G1 provides the lowest minimum cathode current (50 µA) and widest operating temperature range (−40°C to +125°C), making it optimal for energy-efficient industrial and automotive feedback designs requiring long-term thermal stability.
Availability
AP431SHAN1TR-G1 is available at Aetrix Electronics and suitable for USB-C power adapters, industrial PLC power rails, server VRM sensing, and automotive infotainment DC-DC converters requiring stable component supply with guaranteed long-term continuity.
Supply support for AP431SHAN1TR-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in ASE, Amkor, and its own facilities.
The AP431S/AP431SH product line targets high-accuracy, low-quiescent shunt regulation in space-constrained power management systems, specifically engineered to replace Zener diodes in feedback paths where thermal drift and cathode current efficiency are critical.
FAQ
What is the maximum cathode voltage the AP431SHAN1TR-G1 can regulate?
The AP431SHAN1TR-G1 supports cathode-to-anode voltages up to 36 V under recommended operating conditions, with an absolute maximum rating of 40 V. Operation above 36 V risks exceeding thermal limits or degrading reference accuracy due to increased power dissipation in the die.
Can the AP431SHAN1TR-G1 drive a 10 µF capacitor directly without oscillation?
Yes - the AP431SHAN1TR-G1 is characterized for stable operation with up to 10 µF capacitive load across its full temperature range (−40°C to +125°C), as confirmed by stability boundary testing in the datasheet. No external compensation is required for this condition.
How does the 0.5% reference voltage tolerance impact output accuracy in a 12 V power supply?
In a 12 V design using R1 = 38.3 kΩ and R2 = 10 kΩ, the 0.5% reference tolerance contributes ±0.0125 V error at the reference node, translating to ±0.06 V (±0.5%) output error before considering resistor tolerances and temperature drift - meeting typical industrial PSU specifications.
Is the AP431SHAN1TR-G1 qualified for automotive applications per AEC-Q100?
No - the AP431SHAN1TR-G1 is not AEC-Q100 qualified. Diodes offers the AP431SHQ series (e.g., AP431SHQAN1TR-G1) for automotive use, which undergoes stress testing per AEC-Q100 Grade 1 (−40°C to +125°C) and is manufactured in IATF 16949-certified facilities.
AP431SHAN1TR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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-23-3
AP431SHAN1TR-G1 FAQ
1.How can I place an order for AP431SHAN1TR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431SHAN1TR-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 AP431SHAN1TR-G1 reliable?
The price and inventory of AP431SHAN1TR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431SHAN1TR-G1 is usually 5 days.
3.What payment methods are accepted for AP431SHAN1TR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431SHAN1TR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431SHAN1TR-G1?
AP431SHAN1TR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431SHAN1TR-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 AP431SHAN1TR-G1?
For technical support, including AP431SHAN1TR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431SHAN1TR-G1 requirements.
6.How does Aetrix verify that AP431SHAN1TR-G1 is sourced from the original manufacturer or authorized distributors?
All AP431SHAN1TR-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 AP431SHAN1TR-G1 meets industry standards.
7.What is the process for return or replacement of AP431SHAN1TR-G1?
All AP431SHAN1TR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431SHAN1TR-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 AP431SHAN1TR-G1 part is unused and in its original packaging.
Return procedure for AP431SHAN1TR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431SHAN1TR-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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