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Texas Instruments TL432ACDBZTG4
- Part No.:
- TL432ACDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432ACDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,505
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Product details
Overview
TL432ACDBZTG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 1% initial tolerance at 25°C, 2.47–2.52 V reference voltage, and operation across −40°C to 85°C. It delivers 0.2 Ω typical dynamic impedance and supports adjustable output from Vref to 36 V via two external resistors-used in feedback loops of isolated DC/DC converters and notebook power adapters.
For engineers reviewing the TL432ACDBZTG4 datasheet, TL432ACDBZTG4 pinout, TL432ACDBZTG4 application, or TL432ACDBZTG4 equivalent, this page provides verified electrical specs, thermal behavior, stability boundaries, real-world use cases, and validated alternative parts for industrial power supply design and embedded regulation.
Technical Context
The TL432ACDBZTG4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its pinout differs from TL431 (CATHODE–REF–ANODE vs REF–CATHODE–ANODE), requiring PCB layout revision when substituting.
It operates as a high-gain, low-drift voltage comparator driving a sink-output stage: REF senses voltage relative to ANODE, controlling cathode current to maintain VKA = Vref × (1 + R1/R2). Stability depends on load capacitance and cathode current, with oscillation risk above 10 µF at low IKA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.47–2.52 V at 25°C - sets minimum regulated output in feedback networks |
| Initial Tolerance | ±1% at 25°C (A grade) - defines baseline accuracy before temperature drift correction |
| Temp Range | −40°C to +85°C (I grade) - supports industrial ambient conditions without derating |
| Dynamic Impedance | 0.2 Ω typical - ensures stable regulation under fast load transients up to 100 mA |
| Voltage Drift | ≤14 mV over full temp range - enables <100 ppm/°C effective TC in closed-loop designs |
| Sink Current Range | 1–100 mA - compatible with optocoupler biasing and error amplifier drive requirements |
| Off-State Leakage | ≤0.5 µA at 36 V - minimizes standby power loss in high-voltage auxiliary supplies |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Pin 1: CATHODE; Pin 2: REF; Pin 3: ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current input node | Connects to switched node or transformer secondary; sinks regulated current to maintain VKA |
| Pin 2 (REF) | Reference voltage sense input | High-impedance (≤4 µA) threshold input referenced to ANODE; sets regulation point via resistor divider |
| Pin 3 (ANODE) | Common return path | Typically tied to system ground or negative rail; serves as voltage reference for REF and current return for CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 2.5 V to 36 V - eliminates need for multiple fixed references in multi-rail systems |
| Low output noise | ≤260 nV/√Hz at 1 kHz - preserves signal integrity in precision feedback paths |
| Sharp turn-on characteristic | Sub-µs response to REF threshold crossing - enables fast transient recovery in switching regulators |
| Thermal stability | 14 mV max deviation over −40°C to +85°C - reduces calibration burden in unheated enclosures |
| ESD robustness | ±2000 V HBM - withstands handling and board-level ESD events without latch-up |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage regulation in 48 V input, 12 V/50 A isolated DC/DC modules with optocoupler feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold for TL432ACDBZTG4-based error amplifier driving PC817 optocoupler. Use Value: Enables ±1% output voltage accuracy over line, load, and temperature-meeting ATX12VO spec without trimming. |
Use Scenario: Output voltage sensing in 3-phase rectified 380 VAC-to-24 VDC industrial power supply with active PFC front-end. IC Role / Device Role / Timing Role: Programmable reference setting 24.0 V output via 12.1 kΩ/1.0 kΩ divider; ANODE grounded to common DC bus return. Use Value: Replaces discrete Zener + op-amp solution, reducing BOM count by 3 components and improving long-term drift performance. |
| Notebook PC Power Adapter | Servo Drive Control Module |
Use Scenario: Feedback reference in 19 V, 3.42 A flyback adapter with QR controller and synchronous rectification. IC Role / Device Role / Timing Role: TL432ACDBZTG4 configured as 19.0 V reference (R1 = 68.1 kΩ, R2 = 10.0 kΩ); REF biased from auxiliary winding. Use Value: Achieves <±0.5% load regulation across 0–100% load due to 0.2 Ω dynamic impedance and low Iref drift. |
Use Scenario: Isolated gate driver bias supply regulation in 3-phase IGBT inverter stage with bootstrap and auxiliary windings. IC Role / Device Role / Timing Role: TL432ACDBZTG4 regulates 15 V gate drive rail from 24 V auxiliary source; CATHODE connected to driver IC's VDD pin. Use Value: Maintains stable gate voltage during motor stall conditions where input ripple exceeds 3 Vpp, preventing false shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZRG4 | Same A-grade accuracy and I-temp range, but TL431 pinout (REF–CATHODE–ANODE) | Requires PCB layout change: REF and CATHODE pins swapped vs TL432ACDBZTG4 | Select only if legacy TL431 footprint exists and redesign is not feasible |
| TLVH431ACDBZR | Lower 1.24 V reference, 1% tolerance, same SOT-23-3 package and I-temp rating | Enables lower-voltage feedback (e.g., 3.3 V rails); not drop-in for 2.5 V+ setpoints | Choose when designing new 3.3 V or 5 V isolated supplies needing reduced headroom |
Compared with TL431ACDBZRG4 and TLVH431ACDBZR, TL432ACDBZTG4 offers identical electrical performance but unique pinout compatibility with TL432-specific layouts-critical for avoiding trace rerouting in production revisions and enabling direct replacement where TL432 footprints are standardized.
Availability
TL432ACDBZTG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and notebook PC power adapters requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for TL432ACDBZTG4 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, embedded processing, and power management technologies, with decades of experience in precision reference design.
The TL43x family was developed to replace Zener diodes in feedback regulation, delivering programmable, low-drift, high-stability shunt references for power supply control across automotive, industrial, and computing applications.
FAQ
What is the reference voltage tolerance of TL432ACDBZTG4 at 25°C?
The TL432ACDBZTG4 has a ±1% initial reference voltage tolerance at 25°C, corresponding to a 2.47 V to 2.52 V range. This A-grade specification is confirmed in Section 6.8 of the TI SLVS543S datasheet and applies specifically to the DBZ package variant with I-temp rating. The tolerance remains stable across cathode currents from 1 mA to 100 mA.
How does the pinout of TL432ACDBZTG4 differ from TL431ACDBZRG4?
TL432ACDBZTG4 uses CATHODE–REF–ANODE pinout (Pin 1–2–3), whereas TL431ACDBZRG4 uses REF–CATHODE–ANODE (Pin 1–2–3). This reversal means direct substitution requires PCB trace modification. The difference is explicitly documented in TI's Pin Configuration and Functions section (page 4) and applies only to DBZ and DBV packages-not SOIC or PDIP variants.
What is the maximum cathode voltage rating for TL432ACDBZTG4?
The absolute maximum cathode voltage (VKA) for TL432ACDBZTG4 is 37 V, with recommended operating range from Vref to 36 V. Exceeding 37 V risks permanent damage. This rating is specified in Section 6.1 (Absolute Maximum Ratings) and applies across all temperature grades and packages, including the DBZ variant.
Can TL432ACDBZTG4 be used in place of a Zener diode?
Yes-TL432ACDBZTG4 is explicitly designed as a precision Zener diode replacement. Its sharp turn-on characteristic, 0.2 Ω dynamic impedance, and adjustable 2.5–36 V output enable superior regulation accuracy, lower temperature drift, and higher sink-current capability (up to 100 mA) compared to standard Zeners. TI confirms this use case in the device description (Section 3).
What is the typical dynamic impedance of TL432ACDBZTG4 and why does it matter?
TL432ACDBZTG4 has a typical dynamic impedance of 0.2 Ω at frequencies ≤1 kHz and cathode currents from 1 mA to 100 mA. This low value ensures minimal output voltage variation during rapid load changes-critical for maintaining tight regulation in switching power supplies where feedback loop stability and transient response depend directly on reference impedance.
TL432ACDBZTG4 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:
- Discontinued at Digi-Key
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432ACDBZTG4 FAQ
1.How can I place an order for TL432ACDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432ACDBZTG4 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 TL432ACDBZTG4 reliable?
The price and inventory of TL432ACDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432ACDBZTG4 is usually 5 days.
3.What payment methods are accepted for TL432ACDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432ACDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432ACDBZTG4?
TL432ACDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432ACDBZTG4 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 TL432ACDBZTG4?
For technical support, including TL432ACDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432ACDBZTG4 requirements.
6.How does Aetrix verify that TL432ACDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TL432ACDBZTG4 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 TL432ACDBZTG4 meets industry standards.
7.What is the process for return or replacement of TL432ACDBZTG4?
All TL432ACDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432ACDBZTG4, 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 TL432ACDBZTG4 part is unused and in its original packaging.
Return procedure for TL432ACDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432ACDBZTG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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