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Diodes Incorporated TL432ASA-7
- Part No.:
- TL432ASA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432ASA-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:468,208
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Product details
Overview
TL432ASA-7 from Diodes Incorporated is a precision adjustable shunt regulator in SOT23 package, functioning as a programmable 2.495V reference with ±1.0% initial tolerance at 25°C, 0.2Ω typical dynamic output impedance, and 1mA–100mA cathode sink current capability. It replaces zener diodes in feedback loops of isolated DC-DC converters, voltage monitors, and optocoupler linearizers.
For engineers reviewing the TL432ASA-7 datasheet, TL432ASA-7 pinout, TL432ASA-7 application, or TL432ASA-7 equivalent, key selection criteria include reference voltage accuracy over –40°C to +125°C, low output noise (200nV/√Hz), stability with 50pF load capacitance, and compatibility with external resistor divider networks for 2.5V–36V output programming.
Technical Context
The TL432ASA-7 implements a bandgap-based 2.495V reference with internal error amplifier and NPN output stage, configured as a three-terminal shunt regulator where cathode sinks current when reference pin voltage exceeds VREF. Its operation requires external resistive divider between cathode and anode to set regulated output voltage.
It delivers stable regulation across –40°C to +125°C ambient, with reference voltage deviation ≤34mV over full temperature range and cathode voltage coefficient of –1.0 to –2.7mV/V - enabling predictable feedback loop behavior in high-precision power control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1.0% at 25°C - sets precise threshold for feedback control loops |
| Output Impedance | 0.2Ω typical - ensures minimal output voltage shift under load transients |
| Cathode Current Range | 1mA to 100mA - supports wide-range biasing and error-signal sinking |
| Temperature Range | –40°C to +125°C - enables use in automotive under-hood and industrial environments |
| Dynamic Noise | 200nV/√Hz at 10kHz - critical for low-noise voltage monitoring and sensing circuits |
| Stability Capacitance | ≤50pF - defines minimum bypass capacitor requirement for closed-loop stability |
| Max Cathode Voltage | 40V - allows direct use in 24V and 36V system rails without external clamping |
Pinout & Package
TL432ASA-7 is housed in a standard SOT23-3 surface-mount package with gull-wing leads, footprint compatible with JEDEC TO-236AB. Thermal resistance θJA is 380°C/W, requiring PCB copper area for thermal management above 50mA continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Current return path / ground reference | Connected to system ground or lowest potential node; sets reference for cathode-to-anode voltage |
| 2 (Cathode) | Regulated output sink terminal | Sinks current to maintain VREF at pin 3; voltage here is set by external R1/R2 divider |
| 3 (Reference) | Precision voltage sense input | Compares applied voltage against internal 2.495V bandgap; triggers cathode conduction when exceeded |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage range | 2.5V to 36V via two-resistor divider - eliminates need for multiple fixed-voltage references |
| Low reference input current | 1µA to 4µA - minimizes divider resistor power loss and improves high-impedance sensing accuracy |
| High-temperature performance | Guaranteed operation to +125°C - suitable for engine control units and industrial motor drives |
| RoHS-compliant & halogen-free | Fully lead-free, <900ppm Br+Cl, <1000ppm Sb - meets IPC-1752A environmental compliance requirements |
| Fast pulse response | Settling time <10µs - supports dynamic load regulation in digitally controlled SMPS |
Applications
| Isolated Flyback Feedback | Voltage Monitor Circuit |
|---|---|
Use Scenario: Secondary-side voltage regulation in AC/DC flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.495V reference to drive optocoupler LED, closing isolation barrier feedback loop. Use Value: Enables ±1% output voltage accuracy across line/load/temperature while maintaining galvanic isolation. | Use Scenario: Overvoltage and undervoltage detection in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision reference for comparator inputs, triggering fault signals when supply deviates beyond ±2% window. Use Value: Delivers 34mV max VREF drift over –40°C to +125°C, ensuring consistent trip thresholds without calibration. |
| Programmable Linear Regulator | Optocoupler Linearizer |
Use Scenario: Adjustable output voltage setting for LDOs or series pass transistor regulators. IC Role / Device Role / Timing Role: External reference source replacing fixed Zener, enabling fine-tuned output adjustment via potentiometer. Use Value: Achieves 2.5V–36V programmability with <0.2Ω output impedance, minimizing load regulation error. | Use Scenario: Improving linearity of analog signal transmission across optocouplers in industrial I/O modules. IC Role / Device Role / Timing Role: Biasing optocoupler LED with constant-current sink referenced to stable VREF. Use Value: Reduces nonlinearity from 5% to <0.5% by eliminating Zener voltage drift and temperature coefficient errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AIDBZR | Same 2.495V ±1% reference, SO-8 package, higher 700mW power dissipation | Better thermal performance in high-current (>60mA) or high-ambient (>85°C) conditions | Select when board layout allows SO-8 and thermal margin is constrained |
| AS431ATZ | ±1% tolerance but 2.5V nominal reference, 0.3Ω output impedance, -20°C to +85°C rating | Limited temperature range and higher output impedance reduce accuracy in automotive or wide-temp designs | Avoid for new designs requiring >85°C operation or sub-0.25Ω impedance |
Compared with TL432ASA-7, TL431AIDBZR offers superior thermal handling in SO-8 but larger footprint, while AS431ATZ lacks full industrial temperature support and exhibits higher output impedance - making TL432ASA-7 optimal for space-constrained, wide-temperature, low-noise shunt regulation.
Availability
TL432ASA-7 is available at Aetrix Electronics and suitable for isolated power supplies, battery management systems, and industrial voltage supervision requiring stable component supply, RoHS-compliant sourcing, and SOT23 footprint compatibility.
Supply support for TL432ASA-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 ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.
The TL43x family targets precision voltage reference and shunt regulation applications, designed specifically to replace legacy zener diodes with improved accuracy, temperature stability, and noise performance in feedback and monitoring circuits.
FAQ
What is the minimum cathode current required for regulation in TL432ASA-7?
The TL432ASA-7 requires a minimum cathode current of 0.4mA to 0.7mA (typical 0.5mA) to maintain regulation when cathode voltage equals the reference voltage. Below this threshold, the device exits active regulation and enters high-impedance off-state, with off-current ≤0.5µA at 36V cathode voltage.
Can TL432ASA-7 be used without external resistors?
No - TL432ASA-7 is an adjustable shunt regulator requiring two external resistors (R1 and R2) to form a voltage divider between cathode and anode. Without them, only the internal 2.495V reference appears at the REF pin; no regulated output voltage is established at the cathode.
How does TL432ASA-7 differ from TL431A in pinout and function?
TL432ASA-7 uses the same SOT23-3 pinout as TL431A (Anode–Cathode–Reference), shares identical electrical specifications including 2.495V ±1% reference and 0.2Ω output impedance, and is functionally interchangeable - the "432" designation reflects Diodes' internal part numbering, not functional divergence.
What is the maximum capacitive load TL432ASA-7 can drive while remaining stable?
TL432ASA-7 remains stable with load capacitance ≤50pF across its full operating range. For larger capacitors, stability depends on cathode current: it supports 5nF–20nF at moderate currents (10–50mA), and >300nF only at low currents (<5mA); exceeding these limits risks oscillation in feedback networks.
TL432ASA-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:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 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-23-3
TL432ASA-7 FAQ
1.How can I place an order for TL432ASA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432ASA-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 TL432ASA-7 reliable?
The price and inventory of TL432ASA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432ASA-7 is usually 5 days.
3.What payment methods are accepted for TL432ASA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432ASA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432ASA-7?
TL432ASA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432ASA-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 TL432ASA-7?
For technical support, including TL432ASA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432ASA-7 requirements.
6.How does Aetrix verify that TL432ASA-7 is sourced from the original manufacturer or authorized distributors?
All TL432ASA-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 TL432ASA-7 meets industry standards.
7.What is the process for return or replacement of TL432ASA-7?
All TL432ASA-7 units undergo pre-shipment inspection (PSI). If there is an issue with TL432ASA-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 TL432ASA-7 part is unused and in its original packaging.
Return procedure for TL432ASA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432ASA-7 Tags
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