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Diodes Incorporated AP432ASRG-7
- Part No.:
- AP432ASRG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP432ASRG-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23R
- Quantity:
- Payment:
- Shipping:
Inventory:4,789
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Product details
Overview
AP432ASRG-7 from Diodes Incorporated is an adjustable precision shunt regulator with 1.24V ±0.5% reference voltage, 200mA sink current capability, and 0.2Ω dynamic output impedance. It operates over –20°C to +85°C, supports programmable output voltages from 1.24V to 20V using two external resistors, and replaces Zener diodes in feedback loops of AC/DC adapters, LED drivers, and voltage monitors.
For engineers reviewing the AP432ASRG-7 datasheet, AP432ASRG-7 pinout, AP432ASRG-7 application, or AP432ASRG-7 equivalent, key selection criteria include reference accuracy, cathode current range, temperature coefficient, stability under capacitive loads, and SOT25 package compatibility with PCB layout constraints.
Technical Context
The AP432A uses an internal bandgap reference and active output stage to deliver sharp turn-on characteristics and low dynamic impedance. Its 30 ppm/°C full-range temperature coefficient ensures stable regulation across industrial ambient conditions without external trimming.
It functions as a 3-terminal programmable shunt: cathode sinks current when voltage at the reference terminal exceeds 1.24V, enabling precise feedback control in isolated flyback and buck-derived topologies. Minimum cathode current for regulation is 150μA - critical for low-power standby modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24V ±0.5% - enables fixed or adjustable output without potentiometer drift in power supply feedback networks |
| Sink Current Capability | 200mA - supports direct regulation in medium-power SMPS outputs up to ~5W with appropriate heatsinking |
| Dynamic Output Impedance | 0.2Ω typical - minimizes output voltage deviation under load transients in closed-loop regulation |
| Temp Coefficient | 30 ppm/°C (full range) - ensures ≤±12mV drift from –20°C to +85°C, suitable for industrial-grade supplies |
| Min Cathode Current | 150μA - allows stable operation in ultra-low-quiescent-current standby circuits |
| Output Voltage Range | 1.24V to 20V - set via external resistor divider; supports wide-range adaptability across multiple output rails |
| Package | SOT25 - 5-pin surface-mount package with exposed thermal pad; compatible with standard reflow profiles and automated assembly |
Pinout & Package
SOT25 package: 5-pin, lead-free, RoHS-compliant plastic package with exposed thermal pad for enhanced power dissipation (550 mW rating at +25°C ambient).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Cathode | Current Sink Terminal | Connects to regulated output node; sinks current to maintain VREF at REF pin |
| 2 - Anode | Return Path | Connected to system ground or return rail; completes current path during regulation |
| 3 - REF | Reference Input | High-impedance input sensing voltage divider output; triggers regulation when ≥1.24V |
| 4 - NC | No Connect | Internally unconnected; must be left floating or tied to ground per layout guidelines |
| 5 - NC | No Connect | Internally unconnected; no electrical function; avoid routing signals or power to this pin |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reference Tolerance | ±0.5% (AP432A) - eliminates need for post-production calibration or trim pots in cost-sensitive consumer power supplies |
| Fast Turn-On Response | Sharp knee at VREF - enables rapid error correction in feedback loops, improving transient response in 50–100kHz SMPS |
| Low Output Noise | Sub-10µV RMS - reduces ripple injection into sensitive analog sections when used in mixed-signal power domains |
| Stability with Capacitive Loads | Validated up to 100µF CL across IKA = 1–100mA - simplifies design of low-ESR ceramic-output filter stages without added compensation |
| Green Molding Compound | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - meets IPC-1752A environmental compliance for global OEM shipments |
Applications
| AC/DC Adapter Feedback | LED Constant-Current Driver |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in isolated flyback converters powering USB-C chargers and wall adapters. IC Role / Device Role / Timing Role: Shunt regulator providing optocoupler bias and error signal to primary controller via feedback winding. Use Value: ±0.5% reference accuracy enables ±2% output tolerance over line/load/temp - meeting Level VI efficiency requirements without secondary DC-DC post-regulation. |
Use Scenario: Constant-current sink for high-brightness LED strings in architectural lighting modules. IC Role / Device Role / Timing Role: Precision current reference controlling MOSFET gate drive in linear LED driver topology. Use Value: 150μA minimum cathode current allows deep dimming down to 0.1% brightness while maintaining regulation stability. |
| Overvoltage Protection Circuit | Programmable Voltage Monitor |
|
Use Scenario: Crowbar or latch-off protection for 12V/24V industrial control inputs against surge events. IC Role / Device Role / Timing Role: Adjustable threshold detector triggering SCR gate or MOSFET shutdown when input exceeds safe limit. Use Value: Programmable trip point from 1.24V to 20V with <10mV hysteresis enables single-part support for multiple rail protection schemes. |
Use Scenario: Power-good signaling and brown-out detection in embedded microcontroller power rails. IC Role / Device Role / Timing Role: Precision comparator reference for discrete transistor-based reset generator circuits. Use Value: 30 ppm/°C tempco ensures consistent 3.3V or 5V monitoring thresholds across –20°C to +85°C without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AZ431L | 1.225V ±0.5%, 100mA sink, 0.3Ω impedance, SO-8/SOT23 packages only | Limited max sink current and fewer package options; lacks SOT25 variant with thermal pad | Preferred where board space permits SO-8 and lower power (<1W) regulation suffices |
| TL431BIDBZR | 2.495V ±0.5%, 100mA sink, 0.22Ω impedance, SOT23-3 package | Higher reference voltage requires different resistor scaling; no 5-pin thermal-enhanced option | Chosen when legacy TL431 footprint compatibility is mandatory and 2.5V reference is acceptable |
Compared with AZ431L and TL431BIDBZR, AP432ASRG-7 offers higher sink current (200mA vs. 100mA), lower impedance (0.2Ω), and superior thermal performance in SOT25 - making it optimal for compact, higher-power adapter designs requiring long-term reliability without derating.
Availability
AP432ASRG-7 is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, and industrial voltage monitors requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.
Supply support for AP432ASRG-7 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 high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP432A belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy, low-drift voltage reference and feedback applications in cost-sensitive, space-constrained power systems.
FAQ
What is the maximum recommended cathode voltage for AP432ASRG-7?
The absolute maximum cathode voltage is 20V. Operation above this risks permanent damage to the internal reference circuitry. For reliable long-term use in 19V adapter applications, design with ≤18V cathode voltage and ensure adequate power dissipation margin based on actual IKA and ambient temperature.
Can AP432ASRG-7 replace TL431 in existing designs?
Yes, with minor resistor recalculations: AP432A's 1.24V reference is half that of TL431's 2.495V, so R1/R2 values must be adjusted to maintain the same output voltage. The SOT25 pinout differs - direct drop-in replacement requires PCB revision, but functional equivalence is confirmed in feedback loop applications.
Does AP432ASRG-7 require an external capacitor for stability?
No external capacitor is required for basic regulation, but a 1nF–10nF ceramic capacitor between REF and ANODE improves noise immunity and high-frequency stability. The device remains stable with up to 100µF output capacitance, unlike many shunt regulators that oscillate with large ceramic caps.
Is AP432ASRG-7 suitable for automotive applications?
AP432ASRG-7 is rated for –20°C to +85°C operation and meets AEC-Q200 stress test recommendations for passive components, but it is not AEC-Q100 qualified. It is used in non-safety-critical automotive accessory power supplies (e.g., infotainment USB ports), provided thermal design accounts for under-hood ambient extremes.
AP432ASRG-7 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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 20 V
- Current - Output:
- 200 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 30ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 300 µA
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT23R
AP432ASRG-7 FAQ
1.How can I place an order for AP432ASRG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP432ASRG-7 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 AP432ASRG-7 reliable?
The price and inventory of AP432ASRG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP432ASRG-7 is usually 5 days.
3.What payment methods are accepted for AP432ASRG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP432ASRG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP432ASRG-7?
AP432ASRG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP432ASRG-7 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 AP432ASRG-7?
For technical support, including AP432ASRG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP432ASRG-7 requirements.
6.How does Aetrix verify that AP432ASRG-7 is sourced from the original manufacturer or authorized distributors?
All AP432ASRG-7 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 AP432ASRG-7 meets industry standards.
7.What is the process for return or replacement of AP432ASRG-7?
All AP432ASRG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP432ASRG-7, 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 AP432ASRG-7 part is unused and in its original packaging.
Return procedure for AP432ASRG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP432ASRG-7 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
-
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
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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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