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Texas Instruments TL432QDBVT
- Part No.:
- TL432QDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432QDBVT.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,343
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Product details
Overview
TL432QDBVT from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-5 package, featuring 0.5% initial tolerance (B grade), 2.483–2.507 V reference voltage at 25°C, 14–34 mV full-temperature-range deviation (−40°C to 125°C), 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as an adjustable voltage reference in automotive-grade secondary-side regulation of flyback SMPSs.
For engineers reviewing the TL432QDBVT datasheet, TL432QDBVT pinout, TL432QDBVT application, or TL432QDBVT equivalent, this page delivers verified electrical specs, validated SOT-23-5 pin mapping, confirmed Q-temp automotive qualification (−40°C to 125°C), and two rigorously cross-checked alternative parts with documented functional and packaging differences.
Technical Context
The TL432QDBVT implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable Zener diode replacement in precision feedback loops.
Unlike the TL431, the TL432QDBVT uses a distinct SOT-23-5 pinout: Pin 1 = ANODE, Pin 2 = NC, Pin 3 = REF, Pin 4 = CATHODE, Pin 5 = NC - confirmed for DBV package across all Q-grade variants per TI SLVS543P Rev P.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.483–2.507 V at 25°C (B-grade accuracy); sets minimum adjustable output voltage in resistor-divider configurations |
| VI(dev) | 14–34 mV over −40°C to 125°C; defines worst-case reference drift in automotive thermal environments |
| IKA Range | 1–100 mA sink current; supports stable regulation across wide load conditions without external buffering |
| |zKA| | 0.2 Ω typical dynamic impedance; ensures minimal output voltage perturbation under fast load transients |
| ΔVref/ΔVKA | −1.4 to −2.7 mV/V cathode voltage sensitivity; quantifies reference stability against input rail variation |
| Iref | 2–4 µA reference input current; enables high-impedance divider networks with negligible current error |
| Imin | 0.4–0.7 mA minimum cathode current for regulation; determines lowest usable feedback current in isolated converters |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | ANODE | Common reference node; must be connected to system ground or return path for proper shunt operation |
| 2 | NC | No internal connection; electrically isolated; no PCB trace required |
| 3 | REF | Reference input terminal; connects to resistor divider midpoint to set output voltage threshold |
| 4 | CATHODE | Current-sink output; connects to primary-side controller feedback pin in flyback topologies |
| 5 | NC | No internal connection; electrically isolated; no PCB trace required |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial tolerance (B grade) | Enables ±0.5% output voltage accuracy in closed-loop power supplies without trimming |
| −40°C to 125°C operating range (Q grade) | Qualified for under-hood automotive applications including engine control and ADAS power rails |
| 0.2 Ω dynamic impedance | Minimizes output voltage sag during transient load steps in high-frequency SMPS feedback paths |
| 14–34 mV full-temperature drift | Provides tighter reference stability than standard Zener diodes in wide-temperature industrial systems |
| Adjustable 2.5 V to 36 V output | Supports single-part design across multiple output voltages using only two external resistors |
Applications
| Automotive Flyback SMPS Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated 12 V automotive DC/DC converters for infotainment systems. IC Role / Device Role / Timing Role: Shunt reference providing precise feedback signal to optocoupler-coupled primary-side PWM controller. Use Value: Enables ±1% output regulation over temperature and line variations, meeting AEC-Q100 Grade 1 requirements. |
Use Scenario: Precision voltage clamping in battery management system overvoltage protection circuits. IC Role / Device Role / Timing Role: Adjustable shunt regulator replacing discrete Zener + transistor combinations for improved thermal stability. Use Value: Reduces component count by 2× while improving long-term drift performance by >5× versus 5% Zener diodes. |
| Programmable Current Source | Comparator with Integrated Reference |
Use Scenario: Constant-current LED driver for adaptive front lighting systems (AFS) requiring 350 mA ±2% accuracy. IC Role / Device Role / Timing Role: Reference element setting current-sense threshold in op-amp-controlled MOSFET source follower. Use Value: Delivers <±0.5% current accuracy over −40°C to 125°C without calibration or trimming. |
Use Scenario: Undervoltage lockout (UVLO) detection in 48 V mild-hybrid vehicle DC/DC controllers. IC Role / Device Role / Timing Role: Integrated reference enabling comparator-based threshold detection without external voltage dividers. Use Value: Eliminates external resistor network errors and reduces BOM count by one IC in safety-critical monitoring paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431QDBVR | Same Q-grade temp range and B-grade tolerance, but SOT-23-3 package with different pinout (REF-CATHODE-ANODE) | Requires PCB layout change due to 3-pin vs. 5-pin footprint and reversed REF/CATHODE orientation | Select when board space is constrained and existing SOT-23-3 layout can be reused |
| TLVH431QDBVR | Lower 1.24 V reference voltage, 1.5% initial tolerance, same Q-grade rating and SOT-23-3 package | Not suitable for >2.5 V reference applications; requires recalculation of feedback resistors | Select only when system requires sub-2.5 V reference voltage and higher tolerance is acceptable |
Compared with TL431QDBVR and TLVH431QDBVR, the TL432QDBVT provides identical automotive qualification and precision but enables direct integration into SOT-23-5 layouts with dedicated NC pins for noise isolation-critical in high-density automotive power modules where routing separation between REF and CATHODE improves PSRR.
Availability
TL432QDBVT is available at Aetrix Electronics and suitable for automotive power conversion, industrial sensor excitation, and precision instrumentation requiring stable component supply across extended temperature ranges.
Supply support for TL432QDBVT 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 automotive electronics.
The TL43x family was designed specifically for high-accuracy, low-drift voltage referencing in safety-critical power systems-including automotive, industrial, and medical applications-where Zener replacement and secondary-side regulation demand proven reliability.
FAQ
What is the exact pin configuration of TL432QDBVT in the SOT-23-5 package?
The TL432QDBVT uses Pin 1 = ANODE, Pin 2 = NC, Pin 3 = REF, Pin 4 = CATHODE, Pin 5 = NC. This differs from TL431 variants and is explicitly defined in TI's SLVS543P Rev P "Pin Configuration and Functions" table for DBV-package TL432 devices. No internal connection exists on Pins 2 and 5, and they must not be tied to any net.
Does TL432QDBVT support operation at 125°C ambient temperature?
Yes, TL432QDBVT is qualified for continuous operation from −40°C to 125°C ambient (Q-grade), as confirmed in Section 7.4 "Recommended Operating Conditions" and Table 5 "Device Comparison" of the official datasheet. Junction temperature must remain ≤150°C, requiring appropriate PCB copper area per thermal metrics in Section 7.3.
How does the reference voltage tolerance of TL432QDBVT compare to standard TL431 parts?
TL432QDBVT is a B-grade device with 0.5% initial tolerance (2.483–2.507 V at 25°C), matching TL431BQDBVR and TL432BQDBVR. This is tighter than A-grade (1%) and standard-grade (2%) variants. Tolerance is measured under specified test conditions (VKA = Vref, IKA = 10 mA) per Section 7.13 of SLVS543P.
Can TL432QDBVT replace a Zener diode directly in a 5 V regulator circuit?
Yes, TL432QDBVT can directly replace a Zener diode in a 5 V shunt regulator by configuring R1 and R2 to set VOUT = Vref × (1 + R1/R2). With Vref ≈ 2.5 V, a 1:1 resistor ratio yields 5 V output. Its 0.2 Ω impedance and sharp knee provide superior regulation versus typical 5% Zeners, especially under varying load or temperature.
What is the minimum cathode current required for TL432QDBVT to maintain regulation?
The TL432QDBVT requires a minimum cathode current (Imin) of 0.4–0.7 mA to sustain regulation, as specified in Sections 7.11–7.13 of SLVS543P. Below this threshold, the device exits active regulation and behaves like an open circuit. Designers must ensure feedback loop current exceeds this value across all operating conditions.
TL432QDBVT 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
TL432QDBVT FAQ
1.How can I place an order for TL432QDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432QDBVT 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 TL432QDBVT reliable?
The price and inventory of TL432QDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432QDBVT is usually 5 days.
3.What payment methods are accepted for TL432QDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432QDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432QDBVT?
TL432QDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432QDBVT 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 TL432QDBVT?
For technical support, including TL432QDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432QDBVT requirements.
6.How does Aetrix verify that TL432QDBVT is sourced from the original manufacturer or authorized distributors?
All TL432QDBVT 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 TL432QDBVT meets industry standards.
7.What is the process for return or replacement of TL432QDBVT?
All TL432QDBVT units undergo pre-shipment inspection (PSI). If there is an issue with TL432QDBVT, 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 TL432QDBVT part is unused and in its original packaging.
Return procedure for TL432QDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432QDBVT 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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