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Texas Instruments TL432BQDBZRG4
- Part No.:
- TL432BQDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432BQDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,599
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Product details
Overview
TL432BQDBZRG4 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, −40°C to +125°C operating temperature range, and 14 mV max reference voltage deviation over full temperature range. It delivers 0.2 Ω typical dynamic impedance and supports 1–100 mA sink current for feedback regulation in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432BQDBZRG4 datasheet, TL432BQDBZRG4 pinout, TL432BQDBZRG4 application, or TL432BQDBZRG4 equivalent, key selection criteria include automotive-grade thermal stability (Q-temp), tight 2.483–2.507 V reference voltage window, low-noise operation, and compatibility with adjustable output configurations from 2.5 V to 36 V using two external resistors.
Technical Context
The TL432BQDBZRG4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its Q-grade qualification ensures stable operation across −40°C to +125°C, and its pinout (CATHODE–REF–ANODE) differs from TL431 to prevent layout misplacement in high-reliability designs.
It operates as a precision voltage-controlled current sink: the REF pin senses a fraction of cathode-to-anode voltage via external resistor divider; when that fraction drops below ~2.495 V, the device increases cathode current to restore regulation. This closed-loop behavior enables accurate feedback in secondary-side sensing topologies without optocoupler latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.483–2.507 V at 25°C - defines tight 0.5% accuracy band for precise feedback setpoint in regulated power supplies |
| Temp. Drift (VIdev) | 14–34 mV over −40°C to +125°C - ensures <±0.014% output variation across full automotive temperature range |
| Dynamic Impedance | 0.2 Ω typical - maintains stable regulation under fast load transients in switching power supply feedback loops |
| Sink Current Range | 1–100 mA - supports direct drive of optocoupler LEDs or error amplifier inputs without external buffering |
| Cathode Voltage Range | 2.5 V to 36 V - enables wide-range output adjustment in AC/DC adapters, servo drives, and rack server PSUs |
| Output Noise | Low broadband noise - minimizes jitter in voltage-sensing paths critical for high-efficiency digital power control |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: CATHODE | Shunt current input / voltage sense node | Connects to regulated output rail; carries full sink current; voltage here determines regulation point |
| Pin 2: REF | Reference input threshold | Senses divided cathode voltage; triggers regulation when input reaches ~2.495 V relative to ANODE |
| Pin 3: ANODE | Common return / ground reference | Typically tied to system ground or negative rail; serves as voltage reference for REF and cathode measurement |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy (B Grade) | Enables ±0.5% output voltage tolerance in final power supply design without post-manufacturing trimming |
| −40°C to +125°C Operation (Q Grade) | Qualified for under-hood automotive, industrial motor drives, and telecom infrastructure where ambient extremes occur |
| 0.2 Ω Dynamic Impedance | Provides low-impedance shunt path to suppress ripple and maintain loop stability in high-bandwidth feedback networks |
| 1–100 mA Sink Capability | Directly interfaces with standard optocouplers (e.g., PC817, SFH615A) without series current-limiting resistor redesign |
| Adjustable 2.5–36 V Output | Supports single-component solution for multiple output voltages across diverse power architectures (flyback, forward, LLC) |
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 for data center servers. IC Role / Device Role / Timing Role: Precision shunt reference providing feedback signal to PWM controller via optocoupler. Use Value: Maintains ±0.5% output accuracy across temperature and line/load variations, reducing need for digital compensation. |
Use Scenario: Output voltage stabilization in 3-phase rectified industrial power supplies feeding PLC I/O modules. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting 24 V output with remote sense capability. Use Value: Enables single-reference design across multiple output rails (12 V, 24 V, 48 V) using resistor network reconfiguration. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Feedback reference for auxiliary 15 V bias supply powering gate drivers and isolation amplifiers in VFDs. IC Role / Device Role / Timing Role: High-stability shunt reference ensuring consistent gate drive voltage despite bus ripple and thermal cycling. Use Value: Prevents false overvoltage trips during transient conditions due to <14 mV total drift over −40°C to +125°C. |
Use Scenario: Regulation of 5 V logic supply for position encoder interface and microcontroller in closed-loop servo systems. IC Role / Device Role / Timing Role: Low-noise, low-impedance reference for ADC reference and analog signal conditioning circuits. Use Value: Reduces measurement error in position feedback by minimizing reference-induced noise coupling into sensitive analog paths. |
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 rating, but TL431 pinout (REF–CATHODE–ANODE) - incompatible PCB layout | Requires board revision; not drop-in; used where legacy TL431 footprint exists | Select only if migrating from TL431-based design and layout change is acceptable |
| TLVH431BQDBZR | Lower 1.24 V reference, 0.5% accuracy, same Q-temp range; higher 10 µA max reference current | Better suited for low-voltage rails (<5 V); less compatible with standard 2.5 V feedback dividers | Prefer when designing new 3.3 V or 1.8 V auxiliary supplies needing tighter low-voltage tolerance |
Compared with TL431BQDBZR and TLVH431BQDBZR, TL432BQDBZRG4 provides identical accuracy and temperature performance but mandates correct pin assignment (CATHODE–REF–ANODE) to avoid functional failure-making it optimal for new designs prioritizing layout reliability and automotive qualification.
Availability
TL432BQDBZRG4 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 automotive-grade thermal resilience.
Supply support for TL432BQDBZRG4 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, efficiency, and system-level integration.
TL432BQDBZRG4 belongs to TI's precision voltage reference product line, engineered specifically for high-accuracy, high-stability feedback in isolated power conversion systems across automotive, industrial, and computing applications.
FAQ
What is the reference voltage tolerance of TL432BQDBZRG4 at 25°C?
The TL432BQDBZRG4 has a 0.5% initial reference voltage tolerance at 25°C, corresponding to a guaranteed 2.483 V to 2.507 V range. This B-grade specification is verified per TI's SLVS543S datasheet Section 6.13 and enables high-accuracy regulation without calibration. The TL432BQDBZRG4 maintains this tolerance across its full −40°C to +125°C operating range with ≤34 mV total drift.
How does TL432BQDBZRG4 differ from TL431BQDBZR in pin configuration?
The TL432BQDBZRG4 uses CATHODE–REF–ANODE pinout (Pin 1–2–3), whereas TL431BQDBZR uses REF–CATHODE–ANODE. This deliberate inversion prevents accidental substitution in production and avoids catastrophic misconnection in feedback circuits. The TL432BQDBZRG4's pinout is explicitly defined in TI's datasheet Figure 5-1 for DBZ package and requires dedicated PCB layout.
What is the maximum cathode voltage supported by TL432BQDBZRG4?
The TL432BQDBZRG4 supports a cathode voltage (VKA) up to 36 V, with absolute maximum rating at 37 V. This allows use in high-output-voltage power supplies such as 24 V, 36 V, or 48 V industrial systems. Operation above 36 V risks exceeding recommended conditions and may degrade long-term reliability or trigger overvoltage failure modes.
Can TL432BQDBZRG4 replace a Zener diode in feedback circuits?
Yes - the TL432BQDBZRG4 is explicitly designed as a superior replacement for Zener diodes in voltage regulation applications. With 0.2 Ω dynamic impedance (vs. >10 Ω for typical Zeners), sharp turn-on characteristics, and 0.5% accuracy, it delivers significantly better line/load regulation and thermal stability. Its three-terminal architecture also enables precise voltage setting via external resistors instead of fixed breakdown voltages.
Is TL432BQDBZRG4 qualified for automotive applications?
Yes - the "Q" suffix in TL432BQDBZRG4 denotes Q-temp qualification per AEC-Q100, specifying operation from −40°C to +125°C and meeting automotive reliability standards. It is commonly deployed in engine control units, battery management systems, and ADAS power supplies where extended temperature range and long-term parametric stability are mandatory.
TL432BQDBZRG4 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:
- Obsolete
- 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
TL432BQDBZRG4 FAQ
1.How can I place an order for TL432BQDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BQDBZRG4 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 TL432BQDBZRG4 reliable?
The price and inventory of TL432BQDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BQDBZRG4 is usually 5 days.
3.What payment methods are accepted for TL432BQDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BQDBZRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BQDBZRG4?
TL432BQDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BQDBZRG4 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 TL432BQDBZRG4?
For technical support, including TL432BQDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BQDBZRG4 requirements.
6.How does Aetrix verify that TL432BQDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TL432BQDBZRG4 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 TL432BQDBZRG4 meets industry standards.
7.What is the process for return or replacement of TL432BQDBZRG4?
All TL432BQDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432BQDBZRG4, 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 TL432BQDBZRG4 part is unused and in its original packaging.
Return procedure for TL432BQDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BQDBZRG4 Tags
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TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
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
-
AZ431LANTR-G1
Diodes Incorporated
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