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Diodes Incorporated AP432WG-7
- Part No.:
- AP432WG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP432WG-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,233
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Product details
Overview
AP432WG-7 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with ±1% reference voltage tolerance (1.24 V), 200 mA sink current capability, and 0.2 Ω dynamic output impedance. It operates over −20°C to +85°C and delivers programmable output voltage from 1.24 V to 20 V using two external resistors - widely used in feedback loops of isolated DC-DC converters and voltage monitors.
For engineers reviewing the AP432WG-7 datasheet, AP432WG-7 pinout, AP432WG-7 application, or AP432WG-7 equivalent, key selection criteria include reference accuracy, cathode current rating, temperature coefficient (30 ppm/°C), minimum regulation current (150 µA), and SC59 package thermal performance for space-constrained power supply designs.
Technical Context
The AP432WG-7 implements an internal bandgap reference and high-gain error amplifier driving an active output stage, enabling sharp turn-on and low-output-impedance regulation. Its functional block diagram shows direct reference (REF), anode (A), and cathode (C) terminals with no internal compensation - stability depends on external resistor divider and load capacitance.
It replaces Zener diodes in precision feedback paths by delivering stable 1.24 V reference with <20 mV deviation across −20°C to +85°C and sub-µA reference input current (1.4–3.5 µA typical). The device requires ≥150 µA cathode current to maintain regulation and supports up to 20 V cathode-anode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% - enables fixed or programmable output without trim potentiometers, reducing BOM cost and drift. |
| Sink Current | 200 mA - supports high-current feedback paths in flyback and forward converter secondary-side regulation. |
| Dynamic Output Impedance | 0.2 Ω - ensures minimal output voltage shift under load transients, critical for tight-regulation SMPS designs. |
| Temp Coefficient | 30 ppm/°C - guarantees ≤20 mV total reference drift over full operating range, suitable for industrial-grade supplies. |
| Min Cathode Current | 150 µA - allows stable regulation even at light loads, enabling efficient operation in standby or burst-mode PSUs. |
| Output Voltage Range | 1.24 V to 20 V - set via external R1/R2 divider; supports wide-range adapter and telecom power applications. |
| Package | SC59 - 3-pin SMT package with 0.95 mm profile and 3.0 mm × 2.8 mm footprint, optimized for thermal dissipation in compact layouts. |
Pinout & Package
AP432WG-7 is housed in the SC59 package: a 3-pin surface-mount outline with gull-wing leads, 0.95 mm nominal height, and 2.8 mm × 3.0 mm body dimensions. Thermal resistance (θJA) is ~220°C/W (typical), supporting up to 400 mW power dissipation at +25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Current return path to ground or input rail | Connected to system ground or primary-side return; must handle full cathode current during regulation. |
| 2 - Cathode | Regulated output node / error amplifier output | Drives optocoupler LED or feedback network; voltage here is set by R1/R2 divider relative to REF. |
| 3 - REF | Reference input / error amplifier inverting input | High-impedance node (1.4–3.5 µA input current); connects to voltage divider midpoint for feedback sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 1.24 V ±1% - eliminates need for manual calibration or trimming in production, improving yield and long-term stability. |
| Low dynamic output impedance | 0.2 Ω - maintains regulation accuracy despite rapid load changes, essential for dynamic line/load response in AC-DC adapters. |
| Sharp turn-on response | Sub-microsecond activation - enables fast recovery from undervoltage events and improves transient immunity in feedback loops. |
| Programmable output range | 1.24 V to 20 V - supports universal input (90–264 VAC) adapters, PoE-powered devices, and multi-rail industrial supplies. |
| Lead-free & halogen-free | RoHS-compliant SC59 package with <900 ppm Br/Cl and <1000 ppm Sb - meets IPC-1752A environmental compliance requirements. |
Applications
| Isolated Flyback Converter Feedback | Voltage Monitor with Hysteresis |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 5–24 V output AC-DC adapters with optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable reference to drive optocoupler LED, closing the isolation barrier control loop. Use Value: Enables ±1% output regulation across line/load/temperature without secondary-side LDO, reducing component count and board area. |
Use Scenario: Dual-threshold overvoltage/undervoltage detection for battery management or industrial sensor inputs. IC Role / Device Role / Timing Role: Adjustable reference node in comparator-based window detector with hysteresis set by resistor ratios. Use Value: Achieves accurate trip points (e.g., 12.0 V ±0.1 V) using only passive components - no trimming required. |
| Constant-Current Sink | Crowbar Circuit Trigger |
|
Use Scenario: LED biasing or precision current source in analog front-ends and test equipment. IC Role / Device Role / Timing Role: Shunt regulator configured as current sink where cathode current = VREF/RSET. Use Value: Delivers stable 10–200 mA current with <±2% error over temperature, replacing discrete transistor+Zener solutions. |
Use Scenario: Overvoltage protection in 12 V/24 V DC systems triggering SCR-based crowbar shutdown. IC Role / Device Role / Timing Role: Reference element in voltage-sensing network that triggers gate driver when threshold exceeded. Use Value: Activates protection at precisely 13.8 V (e.g.) with <0.1 V tolerance, preventing damage to downstream 12 V logic or motors. |
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, 100 mA sink current, SO-8/SOT23 packages only | Limited to lower-power feedback paths; not rated for >100 mA continuous cathode current | Preferred for cost-sensitive, low-current designs where tighter reference tolerance justifies reduced current headroom. |
| TL431BIDBZR | ±0.5% tolerance, 100 mA sink, SOT23-3 package, higher 0.35 Ω output impedance | Less stable under high-CL conditions; requires larger compensation capacitor in flyback designs | Best suited for non-isolated buck-derived supplies or low-frequency monitoring where thermal constraints favor SOT23. |
Compared with AZ431L and TL431BIDBZR, AP432WG-7 offers higher sink current (200 mA vs. ≤100 mA) and lower output impedance (0.2 Ω vs. ≥0.35 Ω), making it uniquely suitable for high-power isolated converters requiring robust feedback drive and minimal regulation error under transient load steps.
Availability
AP432WG-7 is available at Aetrix Electronics and suitable for isolated AC-DC adapters, industrial voltage monitors, and constant-current LED drivers requiring stable component supply, RoHS-compliant packaging, and extended temperature operation.
Supply support for AP432WG-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.
The AP432 series belongs to Diodes' precision reference product line, engineered specifically for high-accuracy, low-drift shunt regulation in power supply feedback, voltage supervision, and current-source applications.
FAQ
What is the maximum cathode-to-anode voltage rating for AP432WG-7?
The absolute maximum cathode voltage (VCV) is 20 V. Exceeding this risks permanent damage. In practice, the device regulates only when cathode voltage exceeds the programmed output (≥1.24 V), and stable operation requires maintaining VKA within 1.24 V to 20 V per datasheet Figure 1 and Absolute Maximum Ratings table.
Can AP432WG-7 replace a standard Zener diode directly?
Yes - with identical pinout (Anode/Cathode/REF mapped to Zener's cathode/anode), but external resistor configuration differs. Unlike Zeners, AP432WG-7 requires a two-resistor divider from cathode to REF to set output voltage; no direct replacement without circuit modification.
Does AP432WG-7 require external compensation for stability?
No internal compensation is provided. Stability depends on external R1/R2 values and load capacitance (CL). Per Figure 5 in DS31003 Rev. 19, oscillation risk increases above 10 µF CL at low cathode currents; recommended CL is <1 µF for most flyback feedback applications.
What does the 'W' and 'G' in AP432WG-7 signify?
'W' denotes SC59 package; 'G' indicates Green (halogen- and antimony-free) molding compound compliant with IPC-1752A. The '-7' suffix specifies 3,000-piece tape-and-reel packaging. This part is lead-free and RoHS 2 compliant per EU Directive 2011/65/EU.
AP432WG-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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AP432WG-7 FAQ
1.How can I place an order for AP432WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP432WG-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 AP432WG-7 reliable?
The price and inventory of AP432WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP432WG-7 is usually 5 days.
3.What payment methods are accepted for AP432WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP432WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP432WG-7?
AP432WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP432WG-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 AP432WG-7?
For technical support, including AP432WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP432WG-7 requirements.
6.How does Aetrix verify that AP432WG-7 is sourced from the original manufacturer or authorized distributors?
All AP432WG-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 AP432WG-7 meets industry standards.
7.What is the process for return or replacement of AP432WG-7?
All AP432WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP432WG-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 AP432WG-7 part is unused and in its original packaging.
Return procedure for AP432WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP432WG-7 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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