My Inquiry
My Account
Texas Instruments TL432AIDBZT
- Part No.:
- TL432AIDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432AIDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,195
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL432AIDBZT from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±1% initial tolerance (A grade) at 25°C, 14 mV max temperature drift over −40°C to 125°C, and 0.2 Ω typical dynamic impedance - used for feedback regulation in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432AIDBZT datasheet, TL432AIDBZT pinout, TL432AIDBZT application, or TL432AIDBZT equivalent, key selection criteria include its Q-grade temperature range (−40°C to 125°C), cathode current capability (1–100 mA), low output noise, and distinct DBZ pinout versus TL431.
Technical Context
The TL432AIDBZT implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference comparator, and NPN output stage. Its REF pin senses voltage relative to ANODE, enabling precise feedback control when paired with external resistors to set output from 2.495 V to 36 V.
Unlike TL431, the TL432 variant uses inverted pinout in DBZ: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - requiring PCB layout revision for drop-in replacement. It supports stable operation up to 100 mA sink current with <1 µA off-state leakage at 36 V cathode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal (A grade: 2.47–2.52 V at 25°C); sets regulated output via resistor divider. |
| Initial Tolerance | ±1% at 25°C; defines accuracy of voltage setting before temperature and load effects. |
| Temp Range | −40°C to +125°C (Q grade); validated for automotive under-hood and industrial motor drive environments. |
| Dynamic Impedance | 0.2 Ω typical; ensures minimal output voltage shift under fast load transients. |
| Cathode Current | 1–100 mA operating range; enables direct interface with optocoupler LEDs in flyback feedback loops. |
| Ref Input Current | 2–4 µA typical; allows high-impedance resistor networks without significant divider error. |
| Temp Drift | 14 mV max over full range; translates to ~100 ppm/°C stability for closed-loop regulation. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, surface-mount, gull-wing leads. Thermal resistance RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: CATHODE | Shunt current output node | Connects to primary-side feedback network (e.g., optocoupler anode); sinks regulated current. |
| Pin 2: REF | Reference voltage sense input | Compares external divider voltage to internal 2.495 V; high-impedance (µA-level bias). |
| Pin 3: ANODE | Common return/reference ground | Must be tied to system ground or power rail common point; defines voltage reference baseline. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 2.495 V to 36 V via two-resistor divider - replaces discrete Zener diodes in wide-output PSUs. |
| Sharp turn-on characteristic | Fast response to reference threshold crossing enables stable regulation in switching converters with tight loop bandwidth. |
| Low output noise | Sub-20 µVPP (0.1–10 Hz); critical for precision feedback in audio amplifiers and sensor signal chains. |
| High sink-current capability | 100 mA absolute max; drives standard PC817/PC817x optocouplers directly without buffer transistor. |
| Q-grade temperature rating | −40°C to +125°C operation; qualified for industrial servo drives and automotive DC/DC modules. |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage feedback in isolated 48 V–12 V DC/DC modules with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold to control optocoupler LED current and regulate output. Use Value: ±1% initial tolerance and 14 mV temp drift ensure <±1.5% total output variation across thermal cycling and line/load changes. |
Use Scenario: Output voltage regulation in 3 kW industrial rectifier with active PFC front-end. IC Role / Device Role / Timing Role: Precision shunt reference in feedback loop of secondary-side synchronous buck controller. Use Value: 0.2 Ω dynamic impedance minimizes output ripple under 10 A step-load transients. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Auxiliary 15 V rail regulation for gate driver ICs in 3-phase IGBT inverter stacks. IC Role / Device Role / Timing Role: Adjustable shunt reference setting 15 V via R1/R2 divider, sinking 15 mA continuously. Use Value: Q-grade temp range ensures stable 15 V output during 100°C heatsink operation without derating. |
Use Scenario: Isolated feedback for ±15 V analog supply powering position encoder interfaces. IC Role / Device Role / Timing Role: Dual-rail reference generator using single TL432AIDBZT with split-divider topology. Use Value: Low 2–4 µA reference input current prevents loading error in high-resistance divider networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AIDBZR | Same A-grade tolerance and Q-temp range, but TL431 DBZ pinout (Pin 1=REF, Pin 2=CATHODE, Pin 3=ANODE) | Requires PCB redesign due to inverted pinout; not drop-in compatible with TL432AIDBZT layout | Select only if legacy TL431 footprint reuse is prioritized over pinout consistency |
| TLVH431AQDBVRQ1 | Automotive AEC-Q100 qualified, 1.24 V reference, ±0.5% initial tolerance, same DBZ pinout | Lower reference voltage limits max adjustable output to ~32 V; optimized for low-voltage systems | Prefer for automotive applications requiring qualification; avoid if 2.495 V reference is mandatory |
Compared with TL431AIDBZR and TLVH431AQDBVRQ1, TL432AIDBZT provides identical electrical performance and Q-grade rating but mandates strict adherence to its unique DBZ pin assignment - making it optimal for new designs where layout flexibility exists and 2.495 V reference is required.
Availability
TL432AIDBZT is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432AIDBZT 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of heritage in precision analog ICs and power management solutions.
The TL43x family was designed specifically for high-accuracy, low-drift shunt regulation in isolated power supplies and industrial feedback systems - emphasizing thermal stability, noise immunity, and robust sink-current capability.
FAQ
What is the reference voltage tolerance of TL432AIDBZT at 25°C?
The TL432AIDBZT has a ±1% initial reference voltage tolerance at 25°C (A grade), meaning its nominal 2.495 V output falls within 2.470 V to 2.520 V under standard test conditions. This tolerance is specified per TI's SLVS543S datasheet Section 6.8 and applies strictly to the A-grade Q-temp variant TL432AIDBZT.
How does the TL432AIDBZT pinout differ from TL431 in SOT-23-3?
The TL432AIDBZT uses a reversed pinout versus TL431 in DBZ: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. In contrast, TL431DBZ assigns Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. This inversion means TL432AIDBZT cannot be substituted into TL431 layouts without PCB modification.
What is the maximum cathode current supported by TL432AIDBZT?
The TL432AIDBZT supports continuous cathode current from 1 mA to 100 mA per its Recommended Operating Conditions (Section 6.4) and Absolute Maximum Ratings (Section 6.1). Operation above 100 mA risks exceeding junction temperature limits and is not guaranteed.
Does TL432AIDBZT require an external capacitor for stability?
Yes - TL432AIDBZT requires careful output capacitance selection. Per Figure 6-18, instability may occur with >0.1 µF capacitive load at low cathode currents (<10 mA); recommended CL is ≤100 nF for most feedback applications unless compensated with series resistance per TI Application Report SLVA672.
Is TL432AIDBZT suitable for automotive applications?
Yes - TL432AIDBZT is Q-grade qualified for −40°C to +125°C operation and meets TI's automotive reliability standards. While not AEC-Q100 certified out-of-box, its Q-temp rating makes it widely deployed in automotive DC/DC converters and body control modules where extended temperature performance is critical.
TL432AIDBZT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432AIDBZT FAQ
1.How can I place an order for TL432AIDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AIDBZT 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 TL432AIDBZT reliable?
The price and inventory of TL432AIDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AIDBZT is usually 5 days.
3.What payment methods are accepted for TL432AIDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AIDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AIDBZT?
TL432AIDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AIDBZT 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 TL432AIDBZT?
For technical support, including TL432AIDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AIDBZT requirements.
6.How does Aetrix verify that TL432AIDBZT is sourced from the original manufacturer or authorized distributors?
All TL432AIDBZT 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 TL432AIDBZT meets industry standards.
7.What is the process for return or replacement of TL432AIDBZT?
All TL432AIDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TL432AIDBZT, 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 TL432AIDBZT part is unused and in its original packaging.
Return procedure for TL432AIDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AIDBZT 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
