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Diodes Incorporated AP432SRG-7
- Part No.:
- AP432SRG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP432SRG-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23R
- Quantity:
- Payment:
- Shipping:
Inventory:3,252
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Product details
Overview
AP432SRG-7 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with ±1% reference voltage tolerance, 0.2Ω dynamic output impedance, and 200mA sink current capability. It operates over –20°C to +85°C and sets output voltage from 1.24V to 20V via external resistor divider-serving as a Zener diode replacement in feedback loops of AC/DC adapters, LED drivers, and voltage monitors.
For engineers reviewing the AP432SRG-7 datasheet, AP432SRG-7 pinout, AP432SRG-7 application, or AP432SRG-7 equivalent, key selection criteria include reference accuracy (±1%), cathode current regulation threshold (150μA), temperature coefficient (30 ppm/°C), low-noise operation, and SOT23R package compatibility with space-constrained PCB layouts.
Technical Context
The AP432SRG-7 implements a bandgap-based precision reference with active output circuitry enabling sharp turn-on characteristics and stable regulation across its full 1.24V–20V programmable range. Its internal error amplifier compares REF node voltage against a 1.24V reference and drives the cathode-anode path to maintain regulation.
It delivers 0.2Ω typical dynamic output impedance below 1kHz and supports stable operation with load capacitance up to 100μF depending on cathode current and setpoint voltage-verified per stability boundary curves in DS31003 Rev. 19–3. Minimum cathode current for regulation is 150μA, enabling ultra-low-power biasing in high-impedance feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24V ±1% - enables fixed or programmable output without trimming potentiometers, reducing BOM cost and drift. |
| Sink Current Capacity | 200mA - supports direct regulation of medium-power supplies and current-sink applications like LED biasing. |
| Dynamic Output Impedance | 0.2Ω - ensures tight output regulation under fast load transients and minimizes ripple coupling in feedback paths. |
| Min Cathode Current | 150μA - allows use with high-value resistor dividers (>1MΩ), reducing quiescent power in battery-backed circuits. |
| Temp Coefficient | 30 ppm/°C - guarantees ≤±3mV reference drift over –20°C to +85°C, critical for precision voltage monitoring. |
| Output Noise | Low - specified via typical performance plots; enables clean feedback in sensitive analog control loops. |
| Package | SOT23R - RoHS-compliant, green molding compound, 3-pin surface-mount footprint compatible with standard pick-and-place. |
Pinout & Package
AP432SRG-7 is housed in a lead-free, halogen-free SOT23R package (3-pin, single-row, gull-wing leads). Dimensions: 2.90mm × 1.30mm × 1.00mm (L × W × H), with 0.95mm lead pitch and 0.55mm lead width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Current return path | Connected to system ground or low-side return; must handle full cathode current (up to 200mA). |
| 2 - Cathode | Regulated output node | Source/sink point for regulated current; connects to feedback divider top node and load return in shunt configurations. |
| 3 - REF | Reference input | High-impedance sensing node tied to resistor divider midpoint; draws only 1.4–3.5μA, enabling high-R dividers. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 1.24V to 20V using two external resistors-eliminates need for multiple fixed-voltage regulators. |
| Precision reference tolerance | ±1% at 25°C - reduces calibration overhead in factory programming and improves end-product voltage accuracy. |
| Fast turn-on response | Sharp regulation onset enables reliable startup in power supply feedback loops and overvoltage protection circuits. |
| Low dynamic output impedance | 0.2Ω - maintains regulation stability during rapid load changes, especially in constant-current sink applications. |
| RoHS & Green compliance | Lead-free finish and halogen/antimony-free molding compound - meets global environmental compliance requirements. |
Applications
| AC/DC Adapter Feedback | LED Constant-Current Sink |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5V feedback voltage to optocoupler LED anode. Use Value: ±1% VREF ensures ±2% output voltage accuracy across line/load/temperature, meeting Class II efficiency standards. |
Use Scenario: High-efficiency constant-current driver for automotive interior lighting. IC Role / Device Role / Timing Role: Shunt regulator configured as current sink with RSET between cathode and ground. Use Value: 200mA sink capacity and 0.2Ω impedance enable stable 100mA LED current with <±3% variation over temperature. |
| Over/Under-Voltage Protection | Programmable Voltage Monitor |
|
Use Scenario: Dual-threshold detection for microcontroller reset assertion when supply deviates beyond safe limits. IC Role / Device Role / Timing Role: Reference element in comparator-based window detector using two resistor dividers and dual AP432s. Use Value: 30 ppm/°C tempco ensures trip points remain within ±50mV over –20°C to +85°C, preventing false resets. |
Use Scenario: Battery voltage supervision in portable medical devices requiring configurable low-battery warning. IC Role / Device Role / Timing Role: Adjustable reference feeding comparator input; threshold set by external R-divider to match cell chemistry. Use Value: 150μA minimum cathode current allows >1MΩ divider, reducing standby current to <1μA while maintaining accuracy. |
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 | ±0.5% reference tolerance, 100μA min cathode current, 0.3Ω output impedance | Better accuracy and lower bias current, but reduced sink capacity (100mA vs. 200mA) | Preferred where higher precision and lower quiescent current outweigh current drive needs. |
| TL431BIDBZR | ±0.5% tolerance, SO-8 package, 100mA sink, 0.22Ω impedance, wider temp range (–40°C to +125°C) | Higher thermal rating and industry-standard SO-8 footprint, but lower current and larger board area | Chosen for automotive-grade designs requiring extended temperature operation and legacy footprint compatibility. |
Compared with AZ431L and TL431BIDBZR, AP432SRG-7 offers superior sink current (200mA) and SOT23R compactness, making it optimal for cost-sensitive, space-constrained industrial power supplies where ±1% accuracy suffices.
Availability
AP432SRG-7 is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, and voltage monitoring systems requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for AP432SRG-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 and consumer markets.
The AP432 series belongs to Diodes' precision shunt regulator product line, designed specifically for replacing Zener diodes in feedback, current-sinking, and voltage-monitoring applications where accuracy, stability, and low-cost programmability are essential.
FAQ
What is the maximum cathode voltage rating for AP432SRG-7?
The absolute maximum cathode voltage is 20V, as specified in the Absolute Maximum Ratings table. Exceeding this voltage risks permanent device damage. For applications requiring higher voltage tolerance, external clamping or series limiting resistors must be used before the cathode terminal.
Can AP432SRG-7 be used in place of a Zener diode without circuit modification?
Yes-it functions as a direct 3-terminal Zener replacement: anode to ground, cathode to regulated node, and REF to voltage divider midpoint. Unlike Zeners, it requires no minimum current for regulation beyond 150μA and provides tighter tolerance and lower impedance, often simplifying existing designs.
Does AP432SRG-7 require external compensation for stability?
No external compensation is required for basic shunt regulation. However, stability depends on load capacitance and cathode current; per DS31003 Figure 5, oscillation may occur with >10μF capacitance at low IKA. Recommended layout uses short traces and local ceramic bypassing near the REF pin.
Is AP432SRG-7 suitable for automotive applications?
AP432SRG-7 is rated for –20°C to +85°C operating temperature and is not AEC-Q200 qualified. For automotive under-hood use, Diodes recommends the TL431BIDBZR (–40°C to +125°C) or AZ431L with appropriate qualification documentation and derating.
AP432SRG-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:
- ±1%
- 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
AP432SRG-7 FAQ
1.How can I place an order for AP432SRG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP432SRG-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 AP432SRG-7 reliable?
The price and inventory of AP432SRG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP432SRG-7 is usually 5 days.
3.What payment methods are accepted for AP432SRG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP432SRG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP432SRG-7?
AP432SRG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP432SRG-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 AP432SRG-7?
For technical support, including AP432SRG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP432SRG-7 requirements.
6.How does Aetrix verify that AP432SRG-7 is sourced from the original manufacturer or authorized distributors?
All AP432SRG-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 AP432SRG-7 meets industry standards.
7.What is the process for return or replacement of AP432SRG-7?
All AP432SRG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP432SRG-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 AP432SRG-7 part is unused and in its original packaging.
Return procedure for AP432SRG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP432SRG-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
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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