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Diodes Incorporated AP432RL-7
- Part No.:
- AP432RL-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP432RL-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC59R
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
AP432RL-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, sets output voltage from 1.24V to 20V via external resistors, and replaces Zener diodes in feedback loops of AC/DC adapters, LED drivers, and voltage monitors.
For engineers reviewing the AP432RL-7 datasheet, AP432RL-7 pinout, AP432RL-7 application, or AP432RL-7 equivalent, key selection criteria include reference accuracy, cathode current range, temperature coefficient (30 ppm/°C), and SC59R package compatibility with high-density PCB layouts.
Technical Context
The AP432RL-7 implements a bandgap-based precision reference with active output circuitry enabling sharp turn-on response and low 0.2Ω dynamic impedance. Its internal architecture supports stable regulation with minimum cathode current of 150μA and maintains ±1% VREF accuracy across –20°C to +85°C.
It functions as a programmable shunt element where external R1/R2 dividers set VOUT = (1 + R1/R2) × 1.24V. The device exhibits low output noise and stable operation up to 20V cathode-anode voltage, with off-state leakage below 1.0μA at 36V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24V ±1% - enables fixed or adjustable regulation without trimming potentiometers |
| Sink Current Capacity | 200mA - supports direct error-signal sinking in SMPS feedback networks |
| Dynamic Output Impedance | 0.2Ω - ensures minimal load-induced output deviation in closed-loop systems |
| Temp Coefficient | 30 ppm/°C - guarantees <±3mV drift over full operating range for stable reference |
| Min Cathode Current | 150μA - allows regulation at ultra-low bias currents in standby power circuits |
| Cathode Voltage Range | 1.24V to 20V - accommodates wide-input DC-DC converters and battery-monitoring rails |
| Operating Temp Range | –20°C to +85°C - suitable for industrial-grade power supplies and embedded controllers |
Pinout & Package
AP432RL-7 is supplied in SC59R package - a lead-free, RoHS-compliant 3-pin surface-mount variant with gull-wing leads, 1.6mm body width, and thermal pad-compatible footprint (JEDEC TO-236AB). Pin 1 = Anode, Pin 2 = Reference, Pin 3 = Cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode connection | Common return path for cathode current; tied to system ground or negative rail |
| Pin 2 (Reference) | Reference input | High-impedance node sensing divided feedback voltage; determines regulation setpoint |
| Pin 3 (Cathode) | Cathode output | Current-sinking terminal that adjusts to maintain VREF across R1/R2 divider |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 1.24V ±1% - eliminates need for manual calibration in factory-set power supplies |
| Low dynamic output impedance | 0.2Ω - minimizes output perturbation during transient load steps in feedback paths |
| Programmable output range | 1.24V–20V - supports single-part design across multiple output voltages in multi-rail systems |
| Fast turn-on response | Sharp knee characteristic - improves stability margin in optocoupler-coupled flyback regulators |
| Lead-free & halogen-free | RoHS-compliant SC59R package - meets IPC-J-STD-020 moisture sensitivity level 1 (MSL1) |
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: Adjustable shunt regulator providing precise error signal to optocoupler LED. Use Value: ±1% reference accuracy ensures ±2% output voltage tolerance across line/load/temperature without post-production trimming. |
Use Scenario: Setting constant current for high-brightness LED strings in signage and automotive lighting. IC Role / Device Role / Timing Role: Shunt-based current-sense reference in linear LED driver IC feedback loop. Use Value: 200mA sink capacity enables direct drive of optocoupler LEDs or small gate drivers without external transistors. |
| Voltage Monitor & Protection | Overvoltage Crowbar Circuit |
|
Use Scenario: Dual-threshold detection for under-voltage lockout (UVLO) and over-voltage protection (OVP) in battery-powered systems. IC Role / Device Role / Timing Role: Precision reference node in resistor-divider comparator network. Use Value: 30 ppm/°C tempco ensures threshold drift remains below ±5mV from –20°C to +85°C, preventing false trips. |
Use Scenario: Triggering SCR-based crowbar during sustained overvoltage events on 12V/24V DC rails. IC Role / Device Role / Timing Role: Adjustable shunt element controlling gate voltage of triggering transistor. Use Value: Programmable trip point (e.g., 13.8V) achieved with standard 1% resistors-no custom voltage references needed. |
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, 100mA sink current, SOT23-3 package | Limited to lower-current feedback paths; not rated for >100mA continuous sink | Preferred when higher accuracy and smaller footprint are prioritized over current capacity |
| TL431BIDBZR | ±0.5% tolerance, 100mA sink, SO-8 package, higher 0.35Ω output impedance | Requires larger board area; less suitable for space-constrained LED driver PCBs | Chosen when legacy SO-8 layout reuse or TI ecosystem compatibility is required |
Compared with AZ431L and TL431BIDBZR, AP432RL-7 delivers 2× higher sink current in a compact SC59R package while maintaining competitive accuracy-making it optimal for high-current feedback and crowbar circuits where thermal performance and board area are critical.
Availability
AP432RL-7 is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, voltage monitors, and overvoltage protection circuits requiring stable component supply across industrial and consumer production programs.
Supply support for AP432RL-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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP432 series belongs to Diodes' precision reference product line, engineered for high-accuracy voltage regulation in power supply feedback, LED current control, and safety-critical monitoring applications.
FAQ
What is the maximum cathode voltage rating for AP432RL-7?
The absolute maximum cathode-to-anode voltage is 20V. Exceeding this risks permanent damage. In practice, designs should limit VKA to ≤18V with appropriate derating for temperature and reliability margins, especially in crowbar or high-voltage monitor applications.
Can AP432RL-7 replace a Zener diode directly in existing circuits?
Yes - AP432RL-7 can substitute for Zener diodes ≥1.24V with identical 3-pin connections (anode, cathode, reference), but requires two external resistors to set voltage. Unlike Zeners, it draws only 150μA minimum current and offers ±1% accuracy without tolerance stacking.
Does AP432RL-7 require an external capacitor for stability?
No external capacitor is required for basic regulation, but a 10nF–100nF ceramic capacitor between cathode and reference pins improves noise immunity and transient response. Stability boundaries depend on load capacitance (CL) and cathode current (IKA), per Figure 5 in DS31003 Rev. 19.
Is AP432RL-7 recommended for new designs?
No - Diodes Incorporated explicitly labels AP432/AP432A as "NOT RECOMMENDED FOR NEW DESIGN" and recommends AZ431L instead. AP432RL-7 remains available for legacy support, repair, and continuity programs where form-fit-function replacement is required.
AP432RL-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
AP432RL-7 FAQ
1.How can I place an order for AP432RL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP432RL-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 AP432RL-7 reliable?
The price and inventory of AP432RL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP432RL-7 is usually 5 days.
3.What payment methods are accepted for AP432RL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP432RL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP432RL-7?
AP432RL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP432RL-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 AP432RL-7?
For technical support, including AP432RL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP432RL-7 requirements.
6.How does Aetrix verify that AP432RL-7 is sourced from the original manufacturer or authorized distributors?
All AP432RL-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 AP432RL-7 meets industry standards.
7.What is the process for return or replacement of AP432RL-7?
All AP432RL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP432RL-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 AP432RL-7 part is unused and in its original packaging.
Return procedure for AP432RL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP432RL-7 Tags
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TL431BQDBZR
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AN431AN-ATRG1
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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