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Texas Instruments TL432BCDBZTG4
- Part No.:
- TL432BCDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432BCDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,569
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Product details
Overview
TL432BCDBZTG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance at 25°C, 0.2 Ω typical dynamic impedance, and sink-current capability from 1 mA to 100 mA. It operates across −40°C to 125°C (Q-grade), enabling use in industrial AC/DC power supplies and servo drive control modules.
For engineers reviewing the TL432BCDBZTG4 datasheet, TL432BCDBZTG4 pinout, TL432BCDBZTG4 application, or TL432BCDBZTG4 equivalent, key selection considerations include its Q-grade temperature range, SOT-23-3 pinout distinct from TL431, 6 mV max reference voltage drift over temperature, and compatibility with adjustable feedback loops in isolated flyback and forward converters.
Technical Context
The TL432BCDBZTG4 implements a three-terminal adjustable shunt regulator architecture with an internal precision bandgap reference and high-gain error amplifier. Its cathode-anode-ref terminal configuration enables direct replacement of Zener diodes in closed-loop feedback networks where sharp turn-on and low output impedance are critical.
Unlike the TL431, the TL432 variant uses a reversed pinout in SOT-23-3 (CATHODE–REF–ANODE vs. REF–CATHODE–ANODE), requiring PCB layout verification. It shares identical electrical specifications-including 2.483 V to 2.507 V reference voltage range, ≤14 mV total Vref deviation over −40°C to 125°C, and 0.2 Ω dynamic impedance-but mandates pin-aware design integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal (2.483–2.507 V range); sets precise feedback threshold for power supply regulation. |
| Initial Tolerance | ±0.5% at 25°C (B-grade); ensures tight output voltage accuracy without trimming in production. |
| Temp Range | −40°C to +125°C (Q-grade); supports operation in automotive under-hood and industrial motor drive environments. |
| Dynamic Impedance | 0.2 Ω typical; maintains stable reference voltage under fast load transients in switching regulators. |
| Sink Current Range | 1 mA to 100 mA; allows direct interface with optocoupler LEDs in isolated feedback paths without external buffering. |
| Voltage Adjustment | 2.495 V to 36 V via two external resistors; enables flexible output programming in multi-rail power systems. |
| Ref Input Current | 2–4 µA typical; minimizes resistor-divider loading error and enables high-impedance feedback networks. |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body size), 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 / voltage sensing node | Connects to switched-node side of optocoupler LED or directly to power rail; sinks regulated current to maintain Vref at Pin 2. |
| Pin 2 (REF) | Reference input threshold | Compares against internal 2.495 V bandgap; when voltage exceeds threshold, device turns on to sink current from cathode. |
| Pin 3 (ANODE) | Common return / ground reference | Typically tied to system ground or power supply return; defines reference potential for both REF and CATHODE terminals. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dynamic impedance | 0.2 Ω typical ensures minimal output voltage perturbation during transient load steps in SMPS feedback loops. |
| High-temperature grade | Q-grade rating (−40°C to +125°C) enables deployment in servo drives and industrial inverters without derating. |
| Precision reference tolerance | ±0.5% at 25°C (B-grade) reduces need for post-manufacturing calibration in AC/DC adapters and server PSUs. |
| Low reference input current | 2–4 µA typical minimizes divider resistor self-heating and improves long-term stability in high-impedance feedback networks. |
| Wide adjustment range | 2.495 V to 36 V output programmability supports single-part reuse across 5 V, 12 V, 24 V, and 48 V power rails. |
Applications
| Industrial AC/DC Power Supply | Rack Server Power |
|---|---|
Use Scenario: Primary-side feedback regulation in offline flyback converters delivering 12 V/20 A to industrial PLCs. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage threshold to optocoupler-driven PWM controller. Use Value: 0.2 Ω dynamic impedance stabilizes loop response under line/load transients; Q-grade temp range ensures reliability at 70°C ambient. | Use Scenario: Secondary-side voltage monitoring in redundant 12 V intermediate bus converters for blade servers. IC Role / Device Role / Timing Role: Adjustable shunt reference setting feedback point for digital PMBus-controlled DC/DC modules. Use Value: ±0.5% initial tolerance eliminates per-unit calibration; SOT-23-3 footprint saves board space in dense VRM layouts. |
| Servo Drive Control Module | AC Inverter & VF Drives |
Use Scenario: Isolated auxiliary supply regulation for gate driver ICs and current-sense amplifiers in 3-phase servo inverters. IC Role / Device Role / Timing Role: Precision shunt reference establishing stable 5 V rail for analog signal conditioning circuitry. Use Value: 14 mV max Vref deviation over −40°C to +125°C maintains ADC reference accuracy across full motor operating envelope. | Use Scenario: Feedback voltage setting in variable-frequency HVAC inverter power stages operating at 60°C case temperature. IC Role / Device Role / Timing Role: Programmable shunt reference defining output voltage setpoint for isolated DC/DC bias supplies. Use Value: Sink-current capability up to 100 mA supports direct driving of high-CTR optocouplers without buffer transistors. |
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 B-grade accuracy and Q-temp range, but TL431 pinout (REF–CATHODE–ANODE) in SOT-23-3. | Requires PCB redesign due to reversed cathode/ref pin assignment; not drop-in compatible. | Select only if legacy TL431 layout reuse is prioritized over TL432's optimized pinout for optocoupler interfacing. |
| TLVH431AQDBVR | Lower 1.24 V reference voltage, ±0.5% tolerance, same Q-grade, but higher 3 µA ref current and 0.35 Ω impedance. | Not suitable for 2.5 V+ feedback loops; requires resistor network recalculation and may degrade transient response. | Choose only when lower reference voltage is required and tighter thermal drift (±6 mV) is acceptable. |
Compared with TL431BQDBZR, TL432BCDBZTG4 offers native cathode-first pinout simplifying optocoupler connection, while TLVH431AQDBVR trades reference voltage flexibility for reduced headroom-neither is pin-compatible, and all require validation of loop stability and noise performance in target application.
Availability
TL432BCDBZTG4 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, rack server power units, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432BCDBZTG4 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability components.
The TL43x family was designed for precision voltage regulation in feedback loops of switching power supplies, offering programmable shunt references with industry-standard accuracy, temperature stability, and robustness across commercial, industrial, and automotive environments.
FAQ
What is the reference voltage tolerance of TL432BCDBZTG4 at 25°C?
The TL432BCDBZTG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.483 V to 2.507 V range. This B-grade specification is confirmed in Section 6.11 of the TI datasheet SLVS543S and applies specifically to the TL432BCDBZTG4 part number. The tolerance remains valid under recommended operating conditions with 10 mA cathode current and VKA = Vref.
How does TL432BCDBZTG4 differ from TL431 in pinout and functionality?
The TL432BCDBZTG4 uses a CATHODE–REF–ANODE pinout in SOT-23-3, whereas TL431 variants use REF–CATHODE–ANODE. Functionally, TL432BCDBZTG4 matches TL431's electrical specs-including reference voltage, temperature drift, and dynamic impedance-but the reversed pinout requires dedicated PCB layout. This difference is explicitly documented in TI's Pin Configuration section (Figure 5-1) for DBZ packages.
What is the maximum operating temperature range for TL432BCDBZTG4?
The TL432BCDBZTG4 is rated for operation from −40°C to +125°C, designated as Q-grade per TI's device nomenclature. This is verified in the Device Comparison Table (Section 4) and Electrical Characteristics tables 6.12 and 6.13 of SLVS543S. The Q-grade rating makes TL432BCDBZTG4 suitable for under-hood automotive and industrial motor drive applications where ambient temperatures exceed 85°C.
Can TL432BCDBZTG4 replace a Zener diode in power supply designs?
Yes, TL432BCDBZTG4 is explicitly designed as a precision replacement for Zener diodes in voltage regulation applications. Its sharp turn-on characteristic, 0.2 Ω dynamic impedance, and adjustable output (2.495 V to 36 V) enable superior line/load regulation compared to discrete Zeners. TI's Description section confirms this use case for on-board regulation, adjustable power supplies, and switching power supplies-provided the SOT-23-3 pinout and sink-current requirements are met.
What is the typical dynamic impedance of TL432BCDBZTG4 and why does it matter?
The TL432BCDBZTG4 has a typical dynamic impedance of 0.2 Ω, measured at ≤1 kHz with 1–100 mA cathode current. This low value ensures minimal variation in reference voltage during rapid current changes-critical for maintaining loop stability and output accuracy in switching power supplies. The parameter is specified in Tables 6.11–6.13 and validated in Figure 6-12 (|zKA| vs. frequency) of the official TI datasheet SLVS543S.
TL432BCDBZTG4 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:
- ±0.5%
- 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
TL432BCDBZTG4 FAQ
1.How can I place an order for TL432BCDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BCDBZTG4 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 TL432BCDBZTG4 reliable?
The price and inventory of TL432BCDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BCDBZTG4 is usually 5 days.
3.What payment methods are accepted for TL432BCDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BCDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BCDBZTG4?
TL432BCDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BCDBZTG4 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 TL432BCDBZTG4?
For technical support, including TL432BCDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BCDBZTG4 requirements.
6.How does Aetrix verify that TL432BCDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TL432BCDBZTG4 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 TL432BCDBZTG4 meets industry standards.
7.What is the process for return or replacement of TL432BCDBZTG4?
All TL432BCDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432BCDBZTG4, 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 TL432BCDBZTG4 part is unused and in its original packaging.
Return procedure for TL432BCDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BCDBZTG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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