My Inquiry
My Account
Diodes Incorporated AP432AWL-7
- Part No.:
- AP432AWL-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP432AWL-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,894
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP432AWL-7 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with ±0.5% reference voltage tolerance, 1.24 V nominal VREF, and 200 mA sink current capability. It operates over –20°C to +85°C, delivers 0.2 Ω dynamic output impedance, and replaces Zener diodes in voltage regulation, current limiting, and over/under-voltage protection circuits.
For engineers reviewing the AP432AWL-7 datasheet, AP432AWL-7 pinout, AP432AWL-7 application, or AP432AWL-7 equivalent, key selection criteria include reference accuracy, cathode current range, temperature coefficient (30 ppm/°C), low-noise operation, and SC59 package compatibility with space-constrained power management designs.
Technical Context
The AP432A implements an internal bandgap reference and high-gain error amplifier driving an NPN output stage, enabling sharp turn-on and stable regulation across 1.24 V to 20 V via external resistor dividers. Its active sink architecture ensures precise voltage setpoint control independent of load variations.
It features low 150 µA minimum cathode current for regulation onset and maintains <0.5 Ω dynamic output impedance up to 15 mA AC signal swing at ≤1 kHz - critical for maintaining loop stability in feedback-controlled DC-DC converters and linear regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Tolerance | ±0.5% - enables fixed-output regulation without trim potentiometers, reducing BOM cost and long-term drift. |
| Reference Voltage | 1.24 V (typ) - sets minimum programmable output voltage; defines scaling factor for external R1/R2 divider network. |
| Sink Current | 200 mA max - supports high-current shunt regulation and crowbar protection in 5–12 V systems. |
| Temp Coefficient | 30 ppm/°C - ensures ≤12 mV total VREF drift over –20°C to +85°C, suitable for industrial-grade references. |
| Dynamic Impedance | 0.2 Ω (typ) - minimizes output voltage perturbation under fast load transients; improves PSRR in feedback paths. |
| Min Cathode Current | 150 µA - allows reliable regulation start-up even with high-value feedback resistors (>1 MΩ). |
| Output Noise | Low - specified via typical performance curves; supports clean reference generation for ADCs and comparators. |
Pinout & Package
AP432AWL-7 is housed in the SC59 surface-mount package (3-pin, single-row), measuring 2.80 mm × 1.60 mm × 1.10 mm (L × W × H), with gull-wing leads and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Current return path | Connected to system ground or low-side return; completes shunt current loop with cathode. |
| 2 - Cathode | Regulated output node | Source of regulated voltage; sinks current into external load or feedback network; connects to VOUT node. |
| 3 - REF | Reference input | High-impedance sense node tied to resistor divider midpoint; controls regulation point via VREF = 1.24 V threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 1.24 V ± 0.5% - eliminates need for post-production trimming in factory-set power rails. |
| Sharp turn-on response | Active output stage enables sub-µs regulation onset - critical for overvoltage shutdown timing. |
| Programmable output range | 1.24 V to 20 V - achieved with two standard resistors; supports wide-range DC-DC feedback and voltage monitoring. |
| Low dynamic output impedance | 0.2 Ω - maintains regulation accuracy under pulsed loads (e.g., microcontroller wake-up surges). |
| Stable operation with capacitive loads | Validated stability boundary up to 100 µF CL - simplifies design in noisy environments with bulk capacitance. |
Applications
| Over-Voltage Protection | Constant-Current Sink |
|---|---|
|
Use Scenario: Monitoring 12 V automotive supply to trigger shutdown if voltage exceeds 13.8 V. IC Role / Device Role / Timing Role: Precision shunt reference in comparator-based trip circuit; sets exact overvoltage threshold via R1/R2 divider. Use Value: ±0.5% VREF ensures trip point repeatability within ±69 mV, avoiding nuisance shutdowns. |
Use Scenario: Driving LED string with stable 350 mA current from 24 V rail. IC Role / Device Role / Timing Role: Shunt-regulated current source; cathode sinks fixed current determined by RCL = VREF/IOUT. Use Value: 200 mA sink rating and 0.2 Ω impedance maintain ±1% current accuracy despite input ripple. |
| Voltage Monitor for MCU | Higher-Current Shunt Regulator |
|
Use Scenario: Validating 3.3 V LDO output before enabling FPGA configuration. IC Role / Device Role / Timing Role: Low-power voltage supervisor; REF pin monitors divided-down rail while drawing only 1.4 µA. Use Value: 150 µA min cathode current allows use with >100 kΩ dividers, minimizing quiescent power loss. |
Use Scenario: Providing 5 V @ 150 mA to analog sensor subsystem from unregulated 9 V input. IC Role / Device Role / Timing Role: Active shunt regulator; dissipates excess power as heat while holding VOUT steady. Use Value: SC59 package supports 400 mW dissipation at +85°C ambient - sufficient for 4 V dropout at 150 mA. |
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% VREF, 100 mA sink, 0.35 Ω impedance, SO-8/SOT23 packages | Limited to lower current and less precise regulation; lacks SC59 option | Preferred where cost sensitivity outweighs accuracy and current needs |
| TL431ACDBVR | ±1% VREF, 100 mA sink, 0.22 Ω impedance, SOT23-6 package | Requires external capacitor for stability; higher pin count; no SC59 footprint match | Chosen when TI ecosystem alignment or dual-reference capability is required |
Compared with AZ431L and TL431ACDBVR, AP432AWL-7 offers tighter reference tolerance, higher sink current, and direct SC59 drop-in compatibility - making it optimal for compact, high-accuracy shunt regulation where board space and thermal margin are constrained.
Availability
AP432AWL-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, LED driver feedback loops, and embedded voltage supervision requiring stable component supply and long-lifecycle support.
Supply support for AP432AWL-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, designed specifically for replacing Zener diodes in applications demanding tight voltage tolerance, low temperature drift, and robust dynamic performance.
FAQ
What is the maximum cathode voltage rating for AP432AWL-7?
The absolute maximum cathode voltage is 20 V. Exceeding this risks permanent damage to the internal bandgap reference and output transistor. Designers must ensure VIN or transient spikes never exceed 20 V at the cathode terminal, especially in crowbar or overvoltage clamp configurations.
Can AP432AWL-7 operate with a 100 kΩ feedback resistor divider?
Yes - with a 100 kΩ upper resistor and 12.4 kΩ lower resistor, the REF pin draws only ~1.4 µA, well above the 150 µA minimum cathode current requirement. Total divider current remains below 11 µA, ensuring negligible power loss and stable regulation.
Is AP432AWL-7 pin-compatible with standard TL431 footprints?
No - AP432AWL-7 uses the 3-pin SC59 package (Anode–Cathode–REF), whereas TL431 variants commonly use SOT23-6 or TO-92. The pin order and spacing differ; PCB layout requires dedicated SC59 land pattern per Diodes' suggested pad layout (DS31003 Rev. 19, page 12).
Why is AP432AWL-7 marked "NOT RECOMMENDED FOR NEW DESIGN"?
This designation reflects Diodes Incorporated's recommendation to migrate new designs to AZ431L due to its enhanced ESD robustness and broader qualification scope. However, AP432AWL-7 remains fully supported for legacy production, with active inventory, full datasheet compliance, and unchanged electrical specifications.
AP432AWL-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:
- SC-59-3
AP432AWL-7 FAQ
1.How can I place an order for AP432AWL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP432AWL-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 AP432AWL-7 reliable?
The price and inventory of AP432AWL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP432AWL-7 is usually 5 days.
3.What payment methods are accepted for AP432AWL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP432AWL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP432AWL-7?
AP432AWL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP432AWL-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 AP432AWL-7?
For technical support, including AP432AWL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP432AWL-7 requirements.
6.How does Aetrix verify that AP432AWL-7 is sourced from the original manufacturer or authorized distributors?
All AP432AWL-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 AP432AWL-7 meets industry standards.
7.What is the process for return or replacement of AP432AWL-7?
All AP432AWL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP432AWL-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 AP432AWL-7 part is unused and in its original packaging.
Return procedure for AP432AWL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP432AWL-7 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
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
