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Diodes Incorporated AP432RG-7
- Part No.:
- AP432RG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP432RG-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC59R
- Quantity:
- Payment:
- Shipping:
Inventory:3,905
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Product details
Overview
AP432RG-7 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 1.24V ±1% reference voltage, 200mA sink current capability, and 0.2Ω dynamic output impedance. It operates over –20°C to +85°C and enables programmable output voltages from 1.24V to 20V using two external resistors - widely deployed in feedback loops of AC/DC adapters, LED drivers, and voltage monitors.
For engineers reviewing the AP432RG-7 datasheet, AP432RG-7 pinout, AP432RG-7 application, or AP432RG-7 equivalent, key selection criteria include reference accuracy (±1%), cathode current regulation threshold (150μA), temperature coefficient (30 ppm/°C), low-noise operation, and SC59R package compatibility with high-density PCB layouts.
Technical Context
The AP432RG-7 implements an internal bandgap reference and transconductance amplifier driving an NPN pass transistor, enabling sharp turn-on response and stable regulation under varying load and line conditions. Its active output circuitry eliminates Zener diode limitations such as poor temperature stability and high dynamic impedance.
Designed for closed-loop voltage regulation, it functions as a programmable error amplifier where the REF pin senses a resistor-divided fraction of cathode voltage, and the anode-cathode path sinks current to maintain VKA = VREF(1 + R1/R2). Stability is maintained across 0.001–100μF capacitive loads depending on cathode current and setpoint voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24V ±1% - ensures initial output accuracy without trimming in power supply feedback networks |
| Sink Current Capacity | 200mA - supports regulation in medium-power SMPS and linear post-regulators |
| Min Cathode Current | 150μA - enables stable regulation even at light loads, critical for standby-mode efficiency |
| Temp Coefficient | 30 ppm/°C - guarantees ≤20mV drift over –20°C to +85°C, suitable for industrial-grade supplies |
| Dynamic Impedance | 0.2Ω - minimizes output voltage variation under fast load transients |
| Output Voltage Range | 1.24V to 20V - achieved via external R1/R2 divider, eliminating need for multiple fixed-voltage parts |
| Operating Temp | –20°C to +85°C - validated for commercial and extended-temperature embedded power applications |
Pinout & Package
AP432RG-7 is packaged in SC59R - a 3-pin, surface-mount, RoHS-compliant plastic package with gull-wing leads, optimized for thermal performance and automated assembly. Dimensions: 2.80mm × 1.60mm × 1.10mm (L×W×H), 0.75mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Current return path | Connected to system ground or return rail; carries full cathode sink current |
| 2 - Cathode | Regulated output node | Connected to feedback point (e.g., optocoupler LED anode or error amp input); voltage here is controlled |
| 3 - REF | Reference sense input | High-impedance input sensing divided-down cathode voltage; sets regulation point via R1/R2 ratio |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference tolerance | ±1% at 25°C - reduces or eliminates need for post-production calibration in cost-sensitive power designs |
| Low dynamic output impedance | 0.2Ω - improves transient response and ripple rejection in switching regulator feedback paths |
| Fast turn-on response | Sub-microsecond activation - prevents output overshoot during power-up or fault recovery |
| Programmable output range | 1.24V–20V - replaces multiple Zener diodes and simplifies BOM across diverse output voltage requirements |
| Lead-free & halogen-free | SC59R package meets RoHS 2 and JEDEC J-STD-609 Class 1A - compliant for global industrial and consumer shipments |
Applications
| AC/DC Adapter Feedback | LED Constant-Current Driver |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Shunt regulator providing precise reference for optocoupler LED current, closing primary-side PWM loop. Use Value: ±1% reference accuracy maintains ±3% output voltage tolerance across line/load/temperature - meeting IEC 61347 and Energy Star requirements. |
Use Scenario: Constant-current sink for high-brightness LED strings in signage and architectural lighting. IC Role / Device Role / Timing Role: Adjustable shunt regulating current through sense resistor, independent of forward voltage variation. Use Value: 200mA sink capacity and 30 ppm/°C tempco ensure <±5% current drift over ambient - preserving luminous uniformity. |
| Overvoltage Protection Circuit | Programmable Voltage Monitor |
|
Use Scenario: Crowbar or latch-off protection triggered when input exceeds safe threshold in DC-powered systems. IC Role / Device Role / Timing Role: Precision reference enabling comparator trip point set to 12.5V or 15V via resistor divider. Use Value: 150μA minimum cathode current allows reliable triggering even with high-impedance divider networks - reducing quiescent power. |
Use Scenario: System-level brown-out detection or reset generation in microcontroller-based equipment. IC Role / Device Role / Timing Role: Adjustable threshold detector feeding open-drain output or logic gate input. Use Value: Programmable 1.24–20V range supports direct interface with 3.3V, 5V, or 12V rails without level-shifting 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 | 1.24V ±0.5%, 100mA sink, 0.35Ω impedance, SOT23-3 | Lower current rating and higher impedance limit use in >100mA feedback or high-ripple environments | Select AZ431L only for space-constrained, low-current designs where ±0.5% accuracy justifies reduced drive capability |
| TL431BIDBZR | 1.24V ±0.5%, 100mA sink, SO-8 package, higher thermal resistance | SO-8 footprint increases board area; lower max current restricts use in high-power adapters | Prefer TL431BIDBZR only when legacy SO-8 layout reuse or tighter initial tolerance outweighs thermal and current limitations |
Compared with AP432RG-7, AZ431L offers finer reference tolerance but sacrifices 100mA sink current and thermal robustness in SC59R; TL431BIDBZR provides identical accuracy but requires larger SO-8 real estate and delivers less than half the current - making AP432RG-7 optimal for compact, medium-power regulated supplies.
Availability
AP432RG-7 is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, and voltage monitoring circuits requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.
Supply support for AP432RG-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 and manufacturing operations across Asia and the Americas.
The AP432 series belongs to Diodes' precision voltage reference product line, engineered specifically for high-accuracy, low-drift shunt regulation in cost-sensitive power management systems - emphasizing reliability, thermal stability, and ease of integration.
FAQ
What is the minimum cathode current required for regulation in AP432RG-7?
The AP432RG-7 requires a minimum cathode current of 150μA to maintain regulation, verified across –20°C to +85°C. This low threshold enables stable operation with high-value feedback dividers, reducing standby power consumption in energy-efficient adapters and IoT power supplies.
Can AP432RG-7 replace a Zener diode directly in existing designs?
Yes - AP432RG-7 can directly replace Zener diodes rated 1.24V–20V in shunt regulator configurations. Its active circuitry provides sharper knee characteristics, lower dynamic impedance (0.2Ω vs typical Zener's >10Ω), and superior temperature stability, improving overall regulation accuracy without layout changes.
Is AP432RG-7 suitable for automotive applications?
No - AP432RG-7 is specified for commercial/extended temperature range (–20°C to +85°C) and is not AEC-Q200 qualified. For automotive use, Diodes Incorporated recommends the AEC-Q200-qualified AZ431L or AP432Q variants in appropriate packages with extended temperature screening.
How does the SC59R package compare thermally to SOT23 or SOT89-3?
The SC59R package used in AP432RG-7 has a junction-to-ambient thermal resistance (RθJA) of ~220°C/W, between SOT23 (~250°C/W) and SOT89-3 (~150°C/W). Its 1.10mm height and optimized pad layout support better heat dissipation than SOT23 while maintaining compact footprint - ideal for mid-power density applications.
AP432RG-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:
- SC-59R
AP432RG-7 FAQ
1.How can I place an order for AP432RG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP432RG-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 AP432RG-7 reliable?
The price and inventory of AP432RG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP432RG-7 is usually 5 days.
3.What payment methods are accepted for AP432RG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP432RG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP432RG-7?
AP432RG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP432RG-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 AP432RG-7?
For technical support, including AP432RG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP432RG-7 requirements.
6.How does Aetrix verify that AP432RG-7 is sourced from the original manufacturer or authorized distributors?
All AP432RG-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 AP432RG-7 meets industry standards.
7.What is the process for return or replacement of AP432RG-7?
All AP432RG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP432RG-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 AP432RG-7 part is unused and in its original packaging.
Return procedure for AP432RG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP432RG-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
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