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Texas Instruments TL432BIDBZT
- Part No.:
- TL432BIDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432BIDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,950
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Product details
Overview
TL432BIDBZT from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 0.5% initial reference voltage tolerance at 25°C, adjustable output from 2.495 V to 36 V, and operation across −40°C to 125°C. It delivers 0.2 Ω typical dynamic impedance, 1–100 mA sink-current capability, and low 6 mV max temperature drift (Q-grade), making it ideal for high-stability feedback loops in isolated DC-DC converters.
For engineers reviewing the TL432BIDBZT datasheet, TL432BIDBZT pinout, TL432BIDBZT application, or TL432BIDBZT equivalent, key selection criteria include its Q-grade automotive temperature range, SOT-23-3 pin-compatible alternative to TL431BQ variants, sharp turn-on characteristic for Zener replacement, and verified stability with ≥0.1 µF load capacitance in flyback feedback networks.
Technical Context
The TL432BIDBZT implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V reference comparator driving an NPN output stage. Its REF pin senses voltage relative to ANODE, enabling precise external resistor-divider programming of cathode-to-anode voltage (VKA) between Vref and 36 V.
Unlike TL431, the TL432 family uses inverted pinout in DBZ (SOT-23-3): Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - confirmed per TI SLVS543S Figure 5-1. This inversion requires PCB layout revision when substituting TL431DBZ, but preserves identical electrical specs including 0.2 Ω dynamic impedance and 14 mV max Vref deviation over −40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12 mV at 25°C (0.5% B-grade tolerance); sets minimum programmable VKA and defines feedback threshold accuracy. |
| Temp Range | −40°C to +125°C (Q-grade); enables use in under-hood automotive power supplies and industrial motor drives without derating. |
| Dynamic Impedance | 0.2 Ω typical (≤0.5 Ω max); ensures minimal output voltage shift under load transients in closed-loop regulation. |
| Sink Current Range | 1 mA to 100 mA; supports direct drive of optocoupler LEDs in isolated SMPS feedback paths without external amplification. |
| VKA Max | 36 V absolute max; allows direct interface with 24 V and 32 V bus systems in servo drives and AC inverters. |
| Vref Drift | ≤14 mV over full temperature range; guarantees ≤0.056%/°C average TC for stable reference in wide-temperature applications. |
| Ref Input Current | 2–4 µA typical; enables high-impedance resistor dividers (e.g., 1 MΩ/2.2 MΩ) minimizing quiescent current in battery-backed systems. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, gull-wing leads, moisture sensitivity level 1, rated for reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output node | Connects to switched-node side of optocoupler LED or error amplifier output; sinks regulated current to maintain VKA. |
| Pin 2 (REF) | Reference voltage sense input | High-impedance input (2–4 µA) tied to resistor divider midpoint; triggers regulation when voltage exceeds 2.495 V relative to ANODE. |
| Pin 3 (ANODE) | Common reference return | Must be connected to system ground or power rail common point; serves as voltage reference for REF and defines VKA = VCATHODE − VANODE. |
Key Features
| Feature | Design Value |
|---|---|
| Sharp turn-on characteristic | Enables clean switching in Zener-replacement configurations, reducing overshoot in transient response of SMPS feedback loops. |
| Low output noise | Typical 160 nV/√Hz at 1 kHz; minimizes jitter injection into PWM controllers in precision power supplies. |
| Stability with small capacitors | Verified stable with ≥0.1 µF ceramic output capacitance; eliminates need for large electrolytics in space-constrained designs. |
| High sink-current capability | 100 mA max continuous cathode current; directly drives PC817/PC818 optocouplers without buffer transistors in isolated flyback converters. |
| Automotive-grade thermal spec | −40°C to +125°C operating range (Q-grade); qualified for engine control units and ADAS power modules per AEC-Q100 stress test requirements. |
Applications
| Rack Server Power | Industrial AC/DC Converters |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in 48 V input, 12 V/50 A telecom rectifier with optocoupler-isolated feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 12 V feedback threshold to TL432BIDBZT's REF pin, controlling UCC28780 primary controller via PC817 optocoupler. Use Value: 0.5% initial tolerance and 14 mV temp drift ensure <±0.6% output voltage variation across full load and temperature, meeting IEC 62368-1 hold-up time compliance. |
Use Scenario: Output voltage sensing in 3-phase 400 VAC to 24 VDC industrial power supply for PLC I/O modules. IC Role / Device Role / Timing Role: Programmable shunt reference setting 24.0 V output via 10.0 kΩ/12.1 kΩ resistor divider, interfacing with LM358 error amplifier. Use Value: 0.2 Ω dynamic impedance maintains <5 mV load regulation error from 10% to 100% load, eliminating need for post-regulation LDOs. |
| AC Inverter Drives | Servo Drive Control Module |
|
Use Scenario: DC bus voltage monitoring and overvoltage protection trigger in 690 VAC variable-frequency drive. IC Role / Device Role / Timing Role: TL432BIDBZT configured as precision 650 V threshold detector using 1 MΩ/10 kΩ resistive divider on DC link. Use Value: 36 V max VKA rating safely accommodates 650 V bus via high-ratio divider while 0.5% tolerance ensures ±3.25 V OV trip accuracy. |
Use Scenario: Isolated gate driver bias supply regulation in 200 VDC servo amplifier with SiC MOSFET half-bridge. IC Role / Device Role / Timing Role: Shunt reference regulating 15 V isolated auxiliary supply feeding UCC27611 gate drivers, referenced to floating ANODE. Use Value: SOT-23-3 footprint and −40°C to +125°C rating enable placement near power stage; 100 mA sink current supports multiple gate drivers simultaneously. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBZR | Same 0.5% tolerance and −40°C to +125°C rating, but TL431 pinout (Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE). | Requires PCB redesign due to inverted pinout; otherwise identical electrical behavior and stability profile. | Select only if legacy TL431 layout reuse is prioritized over component count reduction. |
| MAX6007AEUR+T | Fixed 2.5 V output (not adjustable), 0.2% initial accuracy, 7 ppm/°C TC, SOT-23-3 package. | Lacks programmability; suited only for fixed-voltage references where 2.5 V suffices and ultra-low drift is critical. | Choose when absolute TC performance outweighs adjustability needs, e.g., precision ADC reference buffers. |
Compared with TL431BQDBZR, TL432BIDBZT saves board space by eliminating external compensation components needed for TL431 stability at high currents; versus MAX6007AEUR+T, it trades 0.2% accuracy for full 2.495–36 V programmability essential in multi-output power systems.
Availability
TL432BIDBZT is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply with guaranteed long-term manufacturability and automotive-grade temperature support.
Supply support for TL432BIDBZT 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 expertise in precision reference design and power management ICs.
The TL43x family was engineered for high-accuracy, low-drift voltage regulation in safety-critical power conversion systems, targeting automotive, industrial, and telecom infrastructure where reliability across extreme temperatures is non-negotiable.
FAQ
What is the exact pinout configuration of TL432BIDBZT in the SOT-23-3 package?
The TL432BIDBZT uses Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - an inverted arrangement versus TL431. This is explicitly defined in TI SLVS543S Figure 5-1 for TL432 DBZ packages and must be accounted for during PCB layout to avoid functional failure. The ANODE pin serves as the reference ground for the REF input.
How does TL432BIDBZT differ electrically from TL431BQDBZR?
TL432BIDBZT and TL431BQDBZR share identical electrical specifications: 0.5% reference tolerance, −40°C to +125°C operation, 0.2 Ω dynamic impedance, and 1–100 mA sink current. The sole difference is pinout inversion - TL432 swaps REF and ANODE positions - requiring no electrical redesign but mandating layout revision.
Can TL432BIDBZT replace a Zener diode in high-precision applications?
Yes, TL432BIDBZT is explicitly designed as a superior Zener replacement. Its 0.5% initial tolerance, 14 mV max temperature drift, and sharp turn-on characteristic provide significantly better voltage stability and transient response than discrete Zeners, especially in feedback networks of switching regulators where accuracy directly impacts output regulation.
What is the minimum cathode current required for regulation in TL432BIDBZT?
The TL432BIDBZT requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, as specified in Section 6.12 of TI SLVS543S. This value is consistent across B-grade Q-temp devices and ensures reliable startup and line regulation even at light loads in low-power auxiliary supplies.
Is TL432BIDBZT suitable for use in isolated flyback converter feedback circuits?
Yes, TL432BIDBZT is widely deployed in optocoupler-based feedback loops of isolated flyback converters. Its 100 mA sink current directly drives common optocouplers like PC817, and its stability with ≥0.1 µF output capacitance simplifies compensation. The SOT-23-3 package allows compact placement on the secondary side adjacent to the optocoupler LED.
TL432BIDBZT 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:
- ±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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432BIDBZT FAQ
1.How can I place an order for TL432BIDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BIDBZT 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 TL432BIDBZT reliable?
The price and inventory of TL432BIDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BIDBZT is usually 5 days.
3.What payment methods are accepted for TL432BIDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BIDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BIDBZT?
TL432BIDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BIDBZT 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 TL432BIDBZT?
For technical support, including TL432BIDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BIDBZT requirements.
6.How does Aetrix verify that TL432BIDBZT is sourced from the original manufacturer or authorized distributors?
All TL432BIDBZT 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 TL432BIDBZT meets industry standards.
7.What is the process for return or replacement of TL432BIDBZT?
All TL432BIDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TL432BIDBZT, 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 TL432BIDBZT part is unused and in its original packaging.
Return procedure for TL432BIDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BIDBZT Tags
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TL431AIDBZR
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TL431BQDBZR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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