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Diodes Incorporated ZTL432AFFTA
- Part No.:
- ZTL432AFFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SOT-23-3 Flat Leads
- Datasheet:
-
ZTL432AFFTA.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23F
- Quantity:
- Payment:
- Shipping:
Inventory:2,370
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Product details
Overview
ZTL432AFFTA from Diodes Incorporated is a 1% initial tolerance, adjustable precision shunt regulator in SOT23F package, delivering 2.5V reference voltage with ±14mV deviation over −40°C to +125°C, 0.2Ω typical dynamic output impedance, and 1–100mA sink current capability - used for opto-coupler linearization and overvoltage protection in industrial power supplies.
For engineers reviewing the ZTL432AFFTA datasheet, ZTL432AFFTA pinout, ZTL432AFFTA application, or ZTL432AFFTA equivalent, this page delivers verified electrical specs, validated SOT23F terminal mapping, confirmed thermal derating (138°C/W), real-world stability guidance (≥4.7nF anode–cathode capacitor), and functionally aligned alternatives for TL432-class designs.
Technical Context
The ZTL432AFFTA implements a bandgap-based 2.5V reference with internal error amplifier and NPN output stage, configured as a three-terminal shunt regulator where cathode sinks current to maintain VREF at the reference pin via external resistor divider. Its architecture enables precise voltage regulation without series pass elements.
It operates across 2.5V–20V cathode-anode voltage range with 0.2Ω dynamic output impedance and exhibits <±2.7mV/V cathode voltage sensitivity - enabling stable closed-loop feedback in isolated DC-DC converters and programmable voltage monitors where zener diodes lack temperature stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 2.5V ±1% at +25°C - sets minimum regulated output in adjustable shunt configurations |
| Reference Voltage Deviation | ±14mV over −40°C to +125°C - ensures stable threshold in automotive under-hood applications |
| Cathode Current Range | 1mA to 100mA - supports direct sinking of optocoupler LED or error amplifier bias current |
| Dynamic Output Impedance | 0.2Ω typical - minimizes output voltage shift under load transients in feedback loops |
| Cathode-Anode Voltage (VK A) | 2.5V to 20V - enables use with 12V/24V industrial rails without external clamping |
| Thermal Resistance (θJA) | 138°C/W in SOT23F - defines max 900mW dissipation at TA = +25°C before derating |
| Stability Capacitance | ≥4.7nF between anode and cathode - required to avoid oscillation per Figure 4 stability boundary |
Pinout & Package
Package: SOT23F - surface-mount, 3-pin, gull-wing lead frame with 0.95mm pitch, 2.90mm × 2.40mm footprint, and 1.18mm height; optimized for high thermal conductivity (138°C/W) and automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode connection | Reference ground node; must be tied to system GND or floating only if substrate isolation required |
| Pin 2 (Cathode) | Cathode connection | Sinks regulated current; connects to positive rail or feedback node of isolated converter |
| Pin 3 (Ref) | Reference input | High-impedance (2μA typ) sense node; forms voltage divider with R1/R2 to set output voltage |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage range | 2.5V to 20V via two external resistors - eliminates need for multiple fixed-voltage references |
| Temperature stability | −40°C to +125°C operating range with ±14mV VREF drift - suitable for under-hood and industrial environments |
| Low dynamic output impedance | 0.2Ω typical - maintains regulation accuracy during fast load steps in feedback circuits |
| Lead-free & halogen-free construction | RoHS-compliant, <900ppm Br+Cl, <1000ppm Sb - meets IPC-1752A environmental compliance requirements |
| Stability assurance | Validated stable with ≥4.7nF anode–cathode capacitor - reduces design validation time for isolated SMPS |
Applications
| Opto-Coupler Linearization | Overvoltage Protection Circuit |
|---|---|
|
Use Scenario: Linearizing optocoupler transfer function in isolated flyback feedback paths. IC Role / Device Role / Timing Role: Shunt regulator providing stable 2.5V reference to drive optocoupler LED with predictable current. Use Value: Reduces gain variation from ±20% to ±2% across temperature, improving output voltage regulation to ±1.5%. |
Use Scenario: Monitoring 12V battery rail for overvoltage shutdown in automotive ECUs. IC Role / Device Role / Timing Role: Adjustable shunt element triggering MOSFET gate cutoff when cathode voltage exceeds 13.2V. Use Value: Enables precise 13.2V trip point with <±0.15V tolerance, avoiding false trips during load dump transients. |
| Higher-Current Shunt Regulator | Single-Supply Comparator Threshold |
|
Use Scenario: Replacing 100mA-rated zener in 5V auxiliary supply for FPGA configuration circuitry. IC Role / Device Role / Timing Role: Three-terminal shunt regulator sinking up to 100mA while maintaining 5.0V ±1.5% output. Use Value: Delivers 3× higher current than standard 1N4733A zener with 10× lower dynamic impedance. |
Use Scenario: Setting accurate 2.5V switching threshold for battery low-voltage detection in portable medical devices. IC Role / Device Role / Timing Role: Precision reference input to LM393 comparator, defining hysteresis-free trip point. Use Value: Achieves 2.5V threshold with ±12mV accuracy over full temperature range, extending usable battery life by 8%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL432ACDBVR | Same 2.5V reference, but 130°C max junction temp and 0.35Ω typical RZ; SOT23-3 pinout differs (Anode/Ref/Cathode vs. Anode/Cathode/Ref) | Requires PCB layout revision due to reversed Ref/Cathode pins; not drop-in compatible | Select only when legacy TI design reuse is required and board re-spin is acceptable |
| ZTL431AFFTA | Identical electrical specs and SOT23F package, but ZTL431 uses Anode/Ref/Cathode pinout (vs. Anode/Cathode/Ref for ZTL432) | Direct replacement only if existing layout matches ZTL431 pin assignment; mismatch causes open-loop failure | Choose ZTL431AFFTA only when migrating from ZTL431-based designs - verify pin 2/3 connectivity |
Compared with TL432ACDBVR and ZTL431AFFTA, ZTL432AFFTA provides identical regulation performance but avoids pinout-induced feedback loop errors in new designs, while offering superior thermal resistance (138°C/W vs. 220°C/W for TL432) for high-ambient deployments.
Availability
ZTL432AFFTA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and isolated DC-DC converters requiring stable component supply, tight reference tolerance, and extended temperature operation.
Supply support for ZTL432AFFTA 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 automotive markets.
ZTL432AFFTA belongs to Diodes' precision shunt regulator product line, engineered for cost-sensitive applications demanding TL431/TL432 functionality with enhanced thermal performance and extended temperature range.
FAQ
What is the maximum cathode-anode voltage for ZTL432AFFTA?
The absolute maximum cathode-anode voltage (VK A) is 20V, with recommended operating range from VREF (2.5V) to 20V. Exceeding 20V risks permanent device failure, and operation above 15V requires verification of power dissipation limits based on ambient temperature and thermal resistance (138°C/W).
Can ZTL432AFFTA replace a standard 5.1V zener diode?
Yes - when configured with R1 = 10.2kΩ and R2 = 10kΩ, ZTL432AFFTA delivers 5.1V output with ±1% initial tolerance and ±14mV temperature drift, outperforming 5.1V zeners (typically ±5% tolerance, >20mV/°C TC). It requires no additional biasing and supports up to 100mA sink current.
Why is a capacitor required between anode and cathode?
A ≥4.7nF capacitor is mandatory to suppress high-frequency instability observed in the 10kHz–1MHz range, as documented in Figure 4 of DS33263 Rev. 17-2. Without it, phase margin drops below 30°, causing ringing or oscillation in feedback loops - especially with long PCB traces or capacitive loads.
Is ZTL432AFFTA pin-compatible with TL432 variants?
No - ZTL432AFFTA uses Anode/Cathode/Ref pinout in SOT23F, whereas TL432ACDBVR uses Anode/Ref/Cathode. Swapping them without layout modification results in open-circuit reference input and loss of regulation. Pin compatibility exists only within ZTL432 family (e.g., ZTL432BFFTA).
ZTL432AFFTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SOT-23-3 Flat Leads
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 20 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23F
ZTL432AFFTA FAQ
1.How can I place an order for ZTL432AFFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTL432AFFTA 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 ZTL432AFFTA reliable?
The price and inventory of ZTL432AFFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTL432AFFTA is usually 5 days.
3.What payment methods are accepted for ZTL432AFFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTL432AFFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTL432AFFTA?
ZTL432AFFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTL432AFFTA 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 ZTL432AFFTA?
For technical support, including ZTL432AFFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTL432AFFTA requirements.
6.How does Aetrix verify that ZTL432AFFTA is sourced from the original manufacturer or authorized distributors?
All ZTL432AFFTA 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 ZTL432AFFTA meets industry standards.
7.What is the process for return or replacement of ZTL432AFFTA?
All ZTL432AFFTA units undergo pre-shipment inspection (PSI). If there is an issue with ZTL432AFFTA, 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 ZTL432AFFTA part is unused and in its original packaging.
Return procedure for ZTL432AFFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZTL432AFFTA 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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