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Texas Instruments TL432QDBZT
- Part No.:
- TL432QDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432QDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,502
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Product details
Overview
TL432QDBZT 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 reference voltage deviation over −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 TL432QDBZT datasheet, TL432QDBZT pinout, TL432QDBZT application, or TL432QDBZT equivalent, this page provides verified functional identity, Q-grade temperature specs, DBZ-package pin validation, and direct alternative options for high-reliability power control designs.
Technical Context
The TL432QDBZT implements a three-terminal adjustable shunt regulator architecture with internal error amplifier and NPN output stage. Its REF pin senses voltage relative to ANODE, enabling precise feedback in isolated topologies where cathode connects to primary-side controller via optocoupler.
Unlike TL431, the TL432 variant uses reversed pinout in DBZ: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - a critical layout distinction confirmed for all TL432x-DBZ variants. It operates across −40°C to +125°C with guaranteed 14 mV VI(dev) and 0.8–2.5 µA II(dev) over full range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (typical), ±0.5% initial tolerance at 25°C - enables accurate setpoint generation without external trimming |
| Temperature Range | −40°C to +125°C (Q grade) - qualified for under-hood automotive and industrial control environments |
| Reference Voltage Drift | ≤14 mV over full temperature range - ensures stable feedback in wide-ambient switching supplies |
| Cathode Current Range | 1 mA to 100 mA sink capability - supports direct drive of optocoupler LEDs in isolated SMPS feedback loops |
| Dynamic Impedance | 0.2 Ω typical at 1–100 mA - minimizes output voltage perturbation during load transients |
| Reference Input Current | 2–4 µA at 25°C - reduces resistor-divider loading error in high-impedance voltage-setting networks |
| Off-State Cathode Current | ≤0.5 µA at 36 V - ensures low standby power in always-on monitoring circuits |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, gull-wing leads, moisture sensitivity level 1. Thermal resistance RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | CATHODE | Shunt current output node; connects to optocoupler anode or regulation loop return path |
| Pin 2 | REF | High-impedance reference input; sets regulated voltage via external resistor divider to ANODE |
| Pin 3 | ANODE | Common reference node; typically tied to system ground or negative rail in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-Qualified Temp Range | −40°C to +125°C operation with guaranteed VI(dev) ≤14 mV - meets AEC-Q100 stress requirements for engine control units |
| Low Dynamic Impedance | 0.2 Ω typical - maintains tight regulation during fast-switching transient events in DC/DC converters |
| Reversed DBZ Pinout vs TL431 | Pin 1=CATHODE, Pin 2=REF, Pin 3=ANODE - prevents PCB layout errors when replacing TL431-DBZ in existing designs |
| Zener Replacement Capability | Sharp turn-on characteristic and 2.495 V reference - eliminates need for multiple Zener diodes while improving accuracy and thermal stability |
| Low Reference Input Current | 2–4 µA - allows use of high-value resistor dividers (>1 MΩ), reducing quiescent power in battery-backed systems |
Applications
| Automotive Flyback SMPS Regulation | Industrial Overvoltage Monitor |
|---|---|
Use Scenario: Secondary-side voltage sensing in 12 V automotive DC/DC converter with optocoupler-coupled feedback to primary-side PWM controller. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise 5.0 V feedback threshold referenced to isolated secondary ground. Use Value: Enables ±1% output regulation across temperature and line variations without primary-side compensation redesign. |
Use Scenario: Detecting >28 V on 24 V industrial bus to trigger shutdown before downstream component damage. IC Role / Device Role / Timing Role: Precision comparator reference with hysteresis set by external resistors; drives protection logic via open-collector output. Use Value: Replaces discrete op-amp + Zener solution, cutting BOM count by 3 parts and improving trip-point repeatability to ±0.5%. |
| Programmable Current Sink | Adjustable Linear Regulator Reference |
Use Scenario: Constant-current LED driver for cabin lighting where brightness must remain stable over −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Shunt reference setting current-sense voltage across series sense resistor; cathode sinks LED-string return current. Use Value: Delivers <±2% current variation across full temperature range due to low VI(dev) and minimal Iref drift. |
Use Scenario: Configuring output of LM317-based lab power supply to deliver 3.3 V, 5.0 V, or 12 V with fine resolution. IC Role / Device Role / Timing Role: External reference replacing LM317's internal 1.25 V bandgap, enabling higher output voltage accuracy and lower tempco. Use Value: Reduces output voltage error from ±2% to ±0.6% and improves temperature coefficient from 100 ppm/°C to 28 ppm/°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431QDBZR | Same Q-grade temp range and 0.5% tolerance, but TL431-DBZ pinout (Pin 1=REF, Pin 2=CATHODE, Pin 3=ANODE) | Requires PCB layout revision; not drop-in compatible due to reversed REF/CATHODE pins | Select only if redesigning board or migrating legacy TL431-DBZ design to Q grade |
| TL432BQDBZT | Same DBZ package and pinout, but B-grade (±0.5%) with tighter VI(dev) ≤14 mV - identical electrical behavior except initial tolerance spec | No functional difference; same automotive qualification and thermal performance | Valid direct replacement where ±0.5% initial tolerance is required and Q-grade temp range is mandatory |
Compared with TL431QDBZR, TL432QDBZT avoids costly PCB respin by preserving TL432-specific pinout; compared with TL432BQDBZT, it offers identical performance but reflects TI's standardized Q-grade nomenclature for automotive applications.
Availability
TL432QDBZT is available at Aetrix Electronics and suitable for automotive power conversion, industrial safety monitoring, and programmable current regulation requiring stable component supply across extended temperature ranges.
Supply support for TL432QDBZT 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 and precision analog ICs.
The TL432 product line delivers automotive-qualified, pin-variant shunt references designed specifically for isolated feedback in high-reliability switching power supplies and voltage supervision systems.
FAQ
What is the exact pin configuration of TL432QDBZT?
The TL432QDBZT uses SOT-23-3 package with confirmed pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This differs from TL431-DBZ (Pin 1 = REF, Pin 2 = CATHODE) and is explicitly documented in TI's SLVS543P datasheet Figure 5. Layout must respect this reversal to avoid functional failure.
Does TL432QDBZT meet automotive qualification standards?
Yes, TL432QDBZT is rated for −40°C to +125°C operation (Q grade) and conforms to AEC-Q100 stress test requirements for automotive applications. Its 14 mV max reference voltage deviation over temperature and 206°C/W thermal resistance support under-hood deployment in engine control and body electronics modules.
How does TL432QDBZT differ electrically from TL431QDBZT?
TL432QDBZT and TL431QDBZT share identical electrical specifications - same reference voltage (2.495 V), tolerance (±0.5%), temperature drift (≤14 mV), dynamic impedance (0.2 Ω), and current range (1–100 mA). The sole difference is pin assignment in DBZ package, making them functionally equivalent but not physically interchangeable without layout change.
Can TL432QDBZT replace a Zener diode in a 5 V regulation circuit?
Yes, TL432QDBZT can directly replace a 5.1 V Zener in shunt regulation applications. Using R1 = 2.4 kΩ and R2 = 1.0 kΩ between CATHODE and ANODE, with REF connected to the R1–R2 junction, it delivers precisely 5.0 V at CATHODE with far better temperature stability (14 mV vs typical Zener's >50 mV drift) and lower dynamic impedance (0.2 Ω vs >10 Ω).
What is the minimum cathode current required for regulation in TL432QDBZT?
The TL432QDBZT requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, per Section 7.7 of the SLVS543P datasheet. Below this threshold, the device exits active regulation and output voltage collapses; design must ensure continuous IKA ≥ 0.4 mA under all operating conditions, including light-load and startup.
TL432QDBZT 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
TL432QDBZT FAQ
1.How can I place an order for TL432QDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432QDBZT 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 TL432QDBZT reliable?
The price and inventory of TL432QDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432QDBZT is usually 5 days.
3.What payment methods are accepted for TL432QDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432QDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432QDBZT?
TL432QDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432QDBZT 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 TL432QDBZT?
For technical support, including TL432QDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432QDBZT requirements.
6.How does Aetrix verify that TL432QDBZT is sourced from the original manufacturer or authorized distributors?
All TL432QDBZT 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 TL432QDBZT meets industry standards.
7.What is the process for return or replacement of TL432QDBZT?
All TL432QDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TL432QDBZT, 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 TL432QDBZT part is unused and in its original packaging.
Return procedure for TL432QDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432QDBZT Tags
-
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
-
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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