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Diodes Incorporated TL432BSA-7
- Part No.:
- TL432BSA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432BSA-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:23,464
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Product details
Overview
TL432BSA-7 from Diodes Incorporated is a precision adjustable shunt regulator in SOT23 package, functioning as a programmable 2.495V reference with ±0.5% 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-based regulation circuits.
For engineers reviewing the TL432BSA-7 datasheet, TL432BSA-7 pinout, TL432BSA-7 application, or TL432BSA-7 equivalent, this page delivers verified electrical parameters, validated SOT23 terminal mapping, real-world use cases in power supervision and isolated feedback, and confirmed alternative parts with documented functional differences.
Technical Context
The TL432BSA-7 implements a bandgap-referenced error amplifier with internal 2.495V reference, enabling precise voltage regulation via external resistor divider. Its low 0.2Ω dynamic output impedance ensures stable closed-loop response under varying load conditions.
It operates across –40°C to +125°C ambient temperature, supports cathode voltages from VREF to 36V, and maintains reference voltage deviation ≤34mV over full temperature range (–40°C to +125°C), making it suitable for industrial and automotive power management systems requiring high thermal stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±0.5% at 25°C - sets tight accuracy baseline for feedback networks |
| Output Impedance | 0.2Ω typical - minimizes regulation error under dynamic cathode current changes |
| Cathode Current Range | 1mA to 100mA - supports wide-range sink capability for diverse biasing and protection circuits |
| Temperature Range | –40°C to +125°C - enables deployment in harsh-environment industrial and automotive applications |
| Max Cathode Voltage | 40V absolute max - allows safe operation up to 36V regulated output in high-voltage SMPS designs |
| Reference Input Current | 1µA to 4µA - reduces divider resistor power loss and improves efficiency in high-impedance feedback paths |
| Thermal Resistance | 380°C/W (Junction-to-Ambient, SOT23) - defines power derating curve for continuous 100mA operation |
Pinout & Package
TL432BSA-7 is housed in a RoHS-compliant, halogen-free SOT23-3 surface-mount package (JEDEC TO-236AB). Dimensions: 2.90mm × 1.30mm × 1.00mm (L×W×H), with gull-wing leads on 0.95mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground reference node | Connected to system ground or return path; establishes common reference for internal bandgap and error amp |
| Ref (Pin 2) | Reference input sensing node | Monitors divided output voltage; triggers regulation when sensed voltage deviates from 2.495V |
| Cathode (Pin 3) | Current sink output terminal | Sinks adjustable current to maintain regulated voltage; drives optocoupler LED or shunt path in feedback loop |
Key Features
| Feature | Design Value |
|---|---|
| High-accuracy reference | ±0.5% initial tolerance (B-grade) - eliminates need for post-production trimming in precision supplies |
| Low-noise regulation | 200nV/√Hz input noise at 10kHz - preserves signal integrity in sensitive analog monitoring circuits |
| Stable with small capacitive loads | Stable with ≤50pF capacitance - enables direct connection to optocoupler inputs without phase compensation |
| Wide operating voltage range | VK = VREF to 36V - supports single-supply designs from 3.3V logic rails up to 36V industrial bus voltages |
| Lead-free & green compliance | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - meets IPC-1752A Class 3 environmental requirements |
Applications
| Isolated DC-DC Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Secondary-side voltage regulation in flyback or forward converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.495V reference to drive optocoupler LED; controls primary-side PWM duty cycle via isolated feedback. Use Value: Enables ±1% output voltage regulation across line/load/temperature with no secondary-side LDO required. | Use Scenario: Monitoring 12V automotive battery rail for overvoltage events above 13.8V. IC Role / Device Role / Timing Role: Adjustable shunt reference triggering comparator or microcontroller reset when divided battery voltage exceeds threshold. Use Value: Delivers 50mV trip accuracy (±0.5% × 2.495V × R1/R2 scaling) without external precision references. |
| Programmable Voltage Monitor | Linear Regulator Reference |
Use Scenario: Detecting undervoltage condition in 5V FPGA core supply before configuration begins. IC Role / Device Role / Timing Role: Configured as 4.75V threshold monitor; sinks current to pull reset line low when supply drops below setpoint. Use Value: Provides hysteresis-free, temperature-stable trip point with <34mV drift over –40°C to +125°C. | Use Scenario: Setting precise output voltage of LM317-based lab bench supply. IC Role / Device Role / Timing Role: Replacing standard 2.49V ADJ pin reference to improve LM317 output accuracy and temperature stability. Use Value: Reduces overall output error from ±2% to ±0.7% by upgrading reference tolerance and thermal coefficient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBVR | Same 2.495V ±0.5% reference, but in SOT-23-5 package with NC pin; higher 500mW power rating | Supports higher continuous cathode current (up to 100mA at elevated ambient) due to improved thermal resistance (250°C/W) | Select when >330mW dissipation is required or NC pin aids layout routing |
| AS432BT-E1 | 2.500V ±0.5% reference; 0.3Ω typical output impedance; same SOT23-3 footprint | Higher 2.500V nominal reference shifts resistor divider ratios; slightly higher output impedance affects transient regulation | Select only if 2.500V nominal simplifies existing BOM or matches legacy design constraints |
Compared with TL432BSA-7, TL431BIDBVR offers better thermal performance in high-power shunt roles, while AS432BT-E1 trades identical accuracy for a 5mV higher nominal reference-requiring resistor recalibration but maintaining pin compatibility.
Availability
TL432BSA-7 is available at Aetrix Electronics and suitable for isolated power supplies, battery protection circuits, and programmable voltage monitors requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.
Supply support for TL432BSA-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 automotive markets.
The TL43x family targets precision voltage reference and shunt regulation applications, designed specifically to replace Zener diodes with superior temperature stability, tighter tolerance, and lower output impedance in feedback and supervision circuits.
FAQ
What is the minimum cathode current required for regulation in TL432BSA-7?
The TL432BSA-7 requires a minimum cathode current of 0.4mA to 0.7mA (typical 0.55mA) to maintain regulation. Below this threshold, the device exits active regulation mode and cathode voltage rises toward the supply rail. This value is specified at VKA = VREF and is critical for sizing feedback resistors in low-power applications.
Can TL432BSA-7 be used in place of TL431BSA-7 without circuit modification?
Yes-TL432BSA-7 and TL431BSA-7 share identical electrical specifications, pinout (SOT23-3), and functional behavior. The "432" designation reflects Diodes' internal part numbering convention for the same die; both parts have 2.495V ±0.5% reference, 0.2Ω output impedance, and identical absolute maximum ratings.
Does TL432BSA-7 require an external capacitor for stability?
No external capacitor is required for basic stability. The device is inherently stable with load capacitance ≤50pF. For larger capacitive loads (5nF–20nF or >300nF), specific stability conditions apply per datasheet curves-but most optocoupler-based feedback designs operate reliably without added capacitance.
What is the thermal derating behavior of TL432BSA-7 above 25°C ambient?
With θJA = 380°C/W in SOT23, TL432BSA-7's maximum allowable power dissipation decreases linearly above 25°C ambient. At 85°C ambient, rated power drops from 330mW to approximately 132mW (330mW × [1 − (85−25)/150]). Derating must be applied before reaching TJ = 150°C junction limit.
TL432BSA-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:
- ±0.5%
- 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
TL432BSA-7 FAQ
1.How can I place an order for TL432BSA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BSA-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 TL432BSA-7 reliable?
The price and inventory of TL432BSA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BSA-7 is usually 5 days.
3.What payment methods are accepted for TL432BSA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BSA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BSA-7?
TL432BSA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BSA-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 TL432BSA-7?
For technical support, including TL432BSA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BSA-7 requirements.
6.How does Aetrix verify that TL432BSA-7 is sourced from the original manufacturer or authorized distributors?
All TL432BSA-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 TL432BSA-7 meets industry standards.
7.What is the process for return or replacement of TL432BSA-7?
All TL432BSA-7 units undergo pre-shipment inspection (PSI). If there is an issue with TL432BSA-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 TL432BSA-7 part is unused and in its original packaging.
Return procedure for TL432BSA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BSA-7 Tags
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TL431BQDBZR
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