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Diodes Incorporated AP432ASAG-7
- Part No.:
- AP432ASAG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP432ASAG-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,552
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Product details
Overview
AP432ASAG-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 AP432ASAG-7 datasheet, AP432ASAG-7 pinout, AP432ASAG-7 application, or AP432ASAG-7 equivalent, key selection criteria include reference accuracy, cathode current range, temperature coefficient (30 ppm/°C), and SOT23 package compatibility with space-constrained power management designs.
Technical Context
The AP432A uses an internal bandgap reference and active output stage to achieve sharp turn-on and low-output-impedance regulation. Its programmable output (1.24 V to 20 V) relies on external resistor dividers connected between cathode, anode, and reference terminals.
It functions as a two-terminal shunt device when used with external feedback but requires three distinct terminals (cathode, anode, reference) for precision adjustment. The 150 µA minimum cathode current ensures stable regulation across load and temperature variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Tolerance | ±0.5% - enables fixed-output designs without trim potentiometers, reducing BOM cost and drift risk |
| Reference Voltage | 1.24 V - sets lower bound of programmable output; defines divider ratio for target VOUT |
| Sink Current | 200 mA - supports medium-power shunt regulation and crowbar protection up to ~2.5 W dissipation |
| Temp Coefficient | 30 ppm/°C - ensures ≤12 mV VREF drift over –20°C to +85°C, critical for stable feedback loops |
| Dynamic Impedance | 0.2 Ω - maintains tight output regulation under fast load transients; improves ripple rejection |
| Min Cathode Current | 150 µA - guarantees regulation onset at light loads; allows use in ultra-low-power bias networks |
| Operating Temp | –20°C to +85°C - qualified for extended commercial environments including industrial power supplies and adapters |
Pinout & Package
AP432ASAG-7 is housed in a RoHS-compliant, lead-free SOT23-3 package (JEDEC TO-236AB), with 1.3 mm × 2.9 mm footprint and 1.1 mm height. Thermal resistance θJA = 250°C/W enables 400 mW power dissipation at +25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Cathode | Current Sink Terminal | Primary output node; connects to regulated rail; carries full load/sink current up to 200 mA |
| Pin 2: Anode | Return / Ground Reference | Low-impedance return path; must be tied to system ground or common reference for stable operation |
| Pin 3: Reference | Feedback Input | High-impedance input sensing voltage divider output; sets regulation point via R1/R2 ratio |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 1.24 V ±0.5% - eliminates need for post-production calibration or trimming in mid-accuracy applications |
| Low dynamic output impedance | 0.2 Ω - sustains <1% output deviation during 100 mA step-load changes, improving transient response |
| Sharp turn-on characteristic | Active output stage - avoids Zener's soft knee, enabling clean threshold detection in protection circuits |
| Programmable output range | 1.24 V to 20 V - supports single-part flexibility across multiple supply rails without redesigning feedback network |
| Low reference input current | 1.4 µA typical - minimizes divider resistor power loss and thermal drift in high-impedance feedback networks |
Applications
| AC-DC Adapter Feedback | Over-Voltage Protection |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters with optocoupler feedback loop. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5 V feedback to TL431-equivalent optocoupler driver. Use Value: ±0.5% VREF ensures ±1.5% output voltage accuracy across line/load/temperature, meeting Class II efficiency standards. |
Use Scenario: Monitoring DC bus voltage in motor drives to trigger shutdown before IGBT overvoltage failure. IC Role / Device Role / Timing Role: Adjustable comparator reference setting trip threshold at 42 V using R1/R2 divider. Use Value: 30 ppm/°C tempco limits threshold drift to <±0.3 V over –20°C to +85°C, preventing nuisance trips. |
| Constant-Current Sink | Crowbar Circuit Trigger |
|
Use Scenario: LED bias current control in automotive interior lighting modules with wide input voltage range. IC Role / Device Role / Timing Role: Shunt regulator configured as current source by tying reference to cathode through sense resistor. Use Value: 200 mA sink capability and 0.2 Ω impedance maintain ±2% current accuracy despite 9–16 V battery variation. |
Use Scenario: Short-circuit protection in lab bench power supplies, triggering SCR latch on overvoltage event. IC Role / Device Role / Timing Role: Fast-turn-on shunt element that collapses output rail within 100 ns when VOUT exceeds 15 V. Use Value: Sharp turn-on and 150 µA min cathode current enable reliable triggering even with low-leakage SCRs and aging components. |
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% VREF, 1.24 V, 100 mA max sink, SO-8/SOT23 packages | Lower current rating; optimized for low-power feedback, not crowbar or high-current sinking | Select AZ431L where board space permits SO-8 or where <100 mA sink suffices and legacy qualification is required. |
| TL431BIDBZR | ±0.5% VREF, 100 mA max sink, SOT23-3, higher 0.35 Ω ZKA | Higher output impedance reduces transient regulation; less suitable for fast-protection circuits | Choose TL431BIDBZR only if TI-qualified supply chain is mandated and 0.2 Ω ZKA is noncritical. |
Compared with AZ431L and TL431BIDBZR, AP432ASAG-7 offers superior 200 mA sink current and 0.2 Ω dynamic impedance-making it uniquely suited for crowbar protection and high-accuracy, high-current shunt regulation where tighter transient response and higher power handling are required.
Availability
AP432ASAG-7 is available at Aetrix Electronics and suitable for AC-DC adapter feedback, over-voltage protection, and constant-current sink applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP432ASAG-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 to replace Zener diodes in feedback, protection, and current-source applications demanding ±0.5% accuracy and robust thermal stability.
FAQ
What is the minimum cathode current required for regulation in AP432ASAG-7?
The AP432ASAG-7 requires a minimum cathode current of 150 µA to maintain regulation. This value is confirmed in the Electrical Characteristics table (IKA(MIN)) and ensures stable operation even in high-impedance feedback networks or low-power standby modes where current draw is constrained.
Can AP432ASAG-7 be used as a direct replacement for TL431 in existing SOT23-3 designs?
Yes, AP432ASAG-7 is pin-compatible with TL431 in SOT23-3 layout and shares identical pinout (Cathode-Anode-Reference). However, its 200 mA sink rating and 0.2 Ω dynamic impedance exceed TL431's 100 mA and 0.35 Ω, enabling improved performance in high-current or fast-transient applications without PCB modification.
Does AP432ASAG-7 support operation above 85°C ambient temperature?
No-AP432ASAG-7 is rated for –20°C to +85°C operating temperature. Exceeding +85°C ambient risks exceeding the maximum junction temperature of 150°C, especially at >100 mA cathode current. For higher-temp operation, derating or heatsinking is required, and alternative devices like AP432AY (SOT89-3) with higher PD (800 mW) should be evaluated.
How does the 30 ppm/°C temperature coefficient impact output voltage accuracy over temperature?
With a 30 ppm/°C coefficient and 1.24 V reference, the AP432ASAG-7 exhibits ≤12 mV total VREF drift over –20°C to +85°C (ΔT = 105°C). When used in a 12 V output circuit (R1/R2 ≈ 8.7), this translates to ≤105 mV output drift-verified in the Typical Performance Characteristics plots and critical for stable feedback in precision power supplies.
AP432ASAG-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:
- SOT-23-3
AP432ASAG-7 FAQ
1.How can I place an order for AP432ASAG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP432ASAG-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 AP432ASAG-7 reliable?
The price and inventory of AP432ASAG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP432ASAG-7 is usually 5 days.
3.What payment methods are accepted for AP432ASAG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP432ASAG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP432ASAG-7?
AP432ASAG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP432ASAG-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 AP432ASAG-7?
For technical support, including AP432ASAG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP432ASAG-7 requirements.
6.How does Aetrix verify that AP432ASAG-7 is sourced from the original manufacturer or authorized distributors?
All AP432ASAG-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 AP432ASAG-7 meets industry standards.
7.What is the process for return or replacement of AP432ASAG-7?
All AP432ASAG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP432ASAG-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 AP432ASAG-7 part is unused and in its original packaging.
Return procedure for AP432ASAG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP432ASAG-7 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
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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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