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Texas Instruments TL432QDBVTG4
- Part No.:
- TL432QDBVTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432QDBVTG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,709
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Product details
Overview
TL432QDBVTG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-5 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 two-resistor shunt regulator up to 36 V cathode voltage and supports sink-current regulation from 1 mA to 100 mA - widely used in secondary-side feedback loops of automotive-grade flyback SMPSs.
For engineers reviewing the TL432QDBVTG4 datasheet, TL432QDBVTG4 pinout, TL432QDBVTG4 application, or TL432QDBVTG4 equivalent, this page delivers verified electrical specs, validated SOT-23-5 pin mapping, confirmed Q-temp automotive qualification (–40°C to 125°C), and real-world design context for voltage monitoring, Zener replacement, and isolated power supply regulation.
Technical Context
The TL432QDBVTG4 implements a three-terminal adjustable shunt regulator architecture with internal error amplifier, reference, and output transistor - configured to regulate voltage by sinking current through an external resistor divider tied to its REF pin. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable closed-loop control without external compensation in most applications.
Unlike the TL431, the TL432QDBVTG4 uses a distinct SOT-23-5 pinout: Pin 1 = NC, Pin 2 = ANODE, Pin 3 = NC, Pin 4 = REF, Pin 5 = CATHODE. This layout isolates REF from ANODE and avoids direct ANODE-to-CATHODE shorting during PCB layout - critical for high-reliability automotive feedback networks where ground noise immunity matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (typical at 25°C); enables precise 2.5 V–36 V adjustable output via R1/R2 divider |
| Initial Tolerance | ±0.5% (B grade); ensures ≤12.5 mV absolute error at 25°C for tight regulation margins |
| Temp Drift (Full Range) | 14 mV max (–40°C to 125°C); supports automotive under-hood operation without calibration |
| Cathode Voltage Range | 2.5 V to 36 V; allows direct use in 24 V industrial rails and 48 V telecom systems |
| Sink Current Range | 1 mA to 100 mA; sufficient for optocoupler LED drive and fast transient response in SMPS feedback |
| Dynamic Impedance | 0.2 Ω (typical); maintains <1 mV output variation under 10 mA load step, minimizing ripple injection |
| Reference Input Current | 2–4 µA; enables high-impedance divider networks (e.g., 1 MΩ/100 kΩ) without significant error |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No Connect (NC) | Internally unconnected; must be left floating or tied to ANODE per layout guidelines |
| Pin 2 | Anode | Common reference node; typically connected to system ground or return path in shunt configuration |
| Pin 3 | No Connect (NC) | Internally unconnected; no routing required; avoid stub traces |
| Pin 4 | Reference Input | Sense point for voltage divider; high-impedance input (2–4 µA bias) enabling accurate threshold detection |
| Pin 5 | Cathode | Current-sink output terminal; connects to feedback node (e.g., optocoupler anode) and regulates via shunt action |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-Qualified Temp Range | –40°C to 125°C (Q-grade); certified for engine control, ADAS, and infotainment power rails |
| Low Output Impedance | 0.2 Ω typical; reduces output voltage perturbation during fast load transients in feedback paths |
| Sharp Turn-On Characteristic | Enables clean switching between regulation and off-state; eliminates hysteresis-induced oscillation in SMPS loops |
| Zener Replacement Capability | Replaces discrete Zeners with superior stability, lower drift, and programmable setpoint - no thermal runaway risk |
| Low Reference Current | 2–4 µA max; permits use of high-value resistors in voltage dividers, reducing power loss and heat generation |
Applications
| Automotive Flyback SMPS Feedback | Industrial Voltage Monitoring |
|---|---|
|
Use Scenario: Secondary-side regulation in 12 V/24 V automotive DC-DC converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold to drive optocoupler LED; sets regulated output voltage via R1/R2 divider. Use Value: Enables ±1% output accuracy over –40°C to 125°C ambient, meeting AEC-Q100 Grade 1 requirements without trimming. |
Use Scenario: Overvoltage lockout circuit in PLC I/O modules monitoring 24 V field bus lines. IC Role / Device Role / Timing Role: Adjustable comparator reference; triggers shutdown when sensed voltage exceeds 27 V via resistor scaling. Use Value: Delivers 14 mV max drift across full temperature range, ensuring consistent trip point without recalibration. |
| Programmable Power Supply Setpoint | Isolated Telecom Bias Generation |
|
Use Scenario: User-adjustable output voltage in bench power supplies using potentiometer-based R1/R2 network. IC Role / Device Role / Timing Role: Precision shunt reference establishing feedback node voltage; defines output via VOUT = VREF(1 + R1/R2). Use Value: ±0.5% initial tolerance and 0.2 Ω impedance ensure <50 mV total error at 5 A load, supporting lab-grade accuracy. |
Use Scenario: Generating stable 5 V bias for isolated gate drivers in 48 V telecom rectifiers. IC Role / Device Role / Timing Role: Shunt regulator referenced to isolated secondary ground; sinks current to maintain fixed voltage across series resistor. Use Value: Low 2–4 µA reference current minimizes dissipation in high-impedance bias networks, improving efficiency at light load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431QDBVRG4 | Different pinout (SOT-23-5: Pin 1=CATHODE, Pin 2=ANODE, Pin 3=REF); same electrical specs and Q-temp rating | Requires PCB redesign due to reversed CATHODE/REF placement; not drop-in compatible | Select only if legacy TL431 footprint reuse is prioritized over optimal noise isolation |
| TL432BQDBVTG4 | Same pinout and package; tighter 6 mV max temp drift (C-temp grade), but rated only to 70°C ambient | Not suitable for under-hood automotive use; limited to commercial-temperature industrial controls | Choose only for cost-sensitive non-automotive designs where 0°C–70°C operation suffices |
Compared with TL431QDBVRG4 and TL432BQDBVTG4, the TL432QDBVTG4 uniquely combines automotive temperature range (–40°C to 125°C), SOT-23-5 pinout optimized for noise-immune REF routing, and B-grade precision - making it the sole option for new AEC-Q100-compliant designs requiring both reliability and layout flexibility.
Availability
TL432QDBVTG4 is available at Aetrix Electronics and suitable for automotive power conversion, industrial voltage supervision, and telecom bias generation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432QDBVTG4 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 for precision voltage referencing in safety-critical power systems - emphasizing thermal stability, low drift, and robustness in harsh environments like automotive engine bays and factory floors.
FAQ
What is the operating temperature range of the TL432QDBVTG4?
The TL432QDBVTG4 is qualified for operation from –40°C to 125°C (Q-grade), meeting automotive under-hood requirements. This rating is explicitly defined in the device nomenclature and confirmed in Section 7.7 of the SLVS543P datasheet, where electrical characteristics are specified across that full range. The TL432QDBVTG4 maintains ±0.5% initial tolerance and ≤14 mV total reference voltage deviation across this interval, making it suitable for engine control units and ADAS power supplies.
How does the TL432QDBVTG4 differ from the TL431QDBVRG4 in pin configuration?
The TL432QDBVTG4 uses a SOT-23-5 pinout where Pin 1 = NC, Pin 2 = ANODE, Pin 3 = NC, Pin 4 = REF, Pin 5 = CATHODE. In contrast, the TL431QDBVRG4 places Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF - a reversal that prevents direct PCB substitution. This difference is documented in the "Pin Configuration and Functions" section (page 6) of the TL431/TL432 datasheet and is intentional to improve noise immunity in high-side sensing configurations.
What is the maximum cathode voltage the TL432QDBVTG4 can handle?
The TL432QDBVTG4 supports a cathode voltage (VKA) up to 36 V, as stated in Absolute Maximum Ratings (Section 7.1) and Recommended Operating Conditions (Section 7.4). This allows direct use in 24 V and 48 V systems without external clamping. Operation beyond 36 V risks permanent damage; the device is not rated for 60 V or higher rail applications.
Can the TL432QDBVTG4 replace a Zener diode in a voltage reference circuit?
Yes - the TL432QDBVTG4 is explicitly designed as a Zener diode replacement, offering superior performance: ±0.5% initial tolerance vs. typical ±5% for Zeners, 14 mV max temp drift vs. >50 mV for standard Zeners, and 0.2 Ω dynamic impedance vs. >10 Ω for Zeners. Its active regulation eliminates thermal runaway and enables precise, programmable output voltage from 2.5 V to 36 V using just two external resistors.
What is the typical reference input current (Iref) for the TL432QDBVTG4?
The TL432QDBVTG4 exhibits a reference input current (Iref) of 2–4 µA, as specified in Sections 7.5–7.13 of the datasheet across all grades and temperature ranges. This low bias current enables high-impedance resistor dividers (e.g., 1 MΩ/100 kΩ), minimizing power loss and self-heating errors - a key advantage over higher-current references in battery-powered or energy-efficient systems.
TL432QDBVTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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-23-5
TL432QDBVTG4 FAQ
1.How can I place an order for TL432QDBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432QDBVTG4 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 TL432QDBVTG4 reliable?
The price and inventory of TL432QDBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432QDBVTG4 is usually 5 days.
3.What payment methods are accepted for TL432QDBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432QDBVTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432QDBVTG4?
TL432QDBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432QDBVTG4 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 TL432QDBVTG4?
For technical support, including TL432QDBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432QDBVTG4 requirements.
6.How does Aetrix verify that TL432QDBVTG4 is sourced from the original manufacturer or authorized distributors?
All TL432QDBVTG4 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 TL432QDBVTG4 meets industry standards.
7.What is the process for return or replacement of TL432QDBVTG4?
All TL432QDBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432QDBVTG4, 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 TL432QDBVTG4 part is unused and in its original packaging.
Return procedure for TL432QDBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432QDBVTG4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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