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Texas Instruments TL432CDBZTG4
- Part No.:
- TL432CDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432CDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
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Product details
Overview
TL432CDBZTG4 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), 6 mV max full-range temperature drift (0°C to 70°C), 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as an adjustable voltage reference in secondary-side regulation of flyback SMPSs.
For engineers reviewing the TL432CDBZTG4 datasheet, TL432CDBZTG4 pinout, TL432CDBZTG4 application, or TL432CDBZTG4 equivalent, this page provides verified electrical specifications, validated SOT-23-3 pin mapping, confirmed thermal performance across commercial temperature range, and two documented alternative parts for design flexibility.
Technical Context
The TL432CDBZTG4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its REF pin senses voltage relative to ANODE, enabling precise feedback control when used with external resistor dividers.
Unlike the TL431, the TL432 variant features inverted pinout in DBZ (SOT-23-3) packaging: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - a critical distinction affecting PCB layout and schematic symbol placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (typical at 25°C, 2.483–2.507 V for B-grade) |
| Initial Tolerance | ±0.5% at 25°C (B grade), enabling high-accuracy feedback loops without trimming |
| Temp Range | 0°C to 70°C (C grade), suitable for commercial power supplies and industrial controls |
| Temp Drift | ≤6 mV over full 0°C–70°C range, ensuring stable regulation under ambient variation |
| Dynamic Impedance | 0.2 Ω (typical), minimizing output voltage perturbation during load transients |
| Sink Current | 1–100 mA operational range, supporting direct drive of optocoupler LEDs in isolated SMPS feedback paths |
| Ref Input Current | 2–4 µA (typical), reducing divider network power loss and bias error |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, surface-mount, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current input / voltage node | Connects to regulated output rail; sinks current to maintain reference voltage at REF |
| Pin 2 (REF) | Reference threshold input | Senses divided output voltage; triggers regulation when ≥2.495 V above ANODE |
| Pin 3 (ANODE) | Common return / ground reference | Typically tied to system ground or low-side return path; all voltages referenced to this pin |
Key Features
| Feature | Design Value |
|---|---|
| Sharp turn-on characteristic | Enables clean switching behavior in comparator-mode applications, avoiding hysteresis-induced oscillation |
| Low output noise | Supports low-noise analog sensing and precision ADC reference buffering without added filtering |
| Zener diode replacement | Provides superior thermal stability and tighter tolerance vs. discrete Zeners in voltage monitoring circuits |
| Adjustable output range | Configurable from 2.5 V to 36 V using two external resistors, simplifying multi-rail supply designs |
Applications
| Secondary-Side SMPS Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Isolated flyback converter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage threshold to drive optocoupler LED current. Use Value: Enables tight output voltage regulation (±1%) across line/load/temperature without primary-side sensing. |
Use Scenario: Overvoltage protection circuit clamping at 5.1 V. IC Role / Device Role / Timing Role: Programmable shunt regulator replacing 5.1 V Zener diode with improved stability. Use Value: Reduces temperature-induced voltage drift from ±50 mV (Zener) to ≤6 mV over 0°C–70°C. |
| Voltage Monitoring | Comparator with Integrated Reference |
Use Scenario: Microcontroller supply rail supervision at 3.3 V. IC Role / Device Role / Timing Role: Adjustable threshold detector comparing monitored rail against internal 2.495 V reference. Use Value: Eliminates need for external precision reference IC, reducing BOM count and layout area. |
Use Scenario: Battery charge termination comparator detecting 4.2 V cell voltage. IC Role / Device Role / Timing Role: Precision reference source feeding non-inverting input of external op-amp comparator. Use Value: Delivers 0.5% reference accuracy independent of op-amp offset, improving charge cutoff repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | Same electrical specs but TL431 pinout (Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE) in identical SOT-23-3 package | Requires PCB layout revision due to inverted pin assignment; not drop-in compatible | Select TL431CDBZR only if legacy schematic uses TL431 pinout and board redesign is feasible |
| TLVH431ACDBVR | Lower 1.24 V reference voltage, 1% initial tolerance, 30 µA max Iref, rated for −40°C to 125°C | Better suited for low-voltage systems (e.g., 1.8 V/2.5 V rails); higher Iref increases divider power loss | Choose TLVH431ACDBVR when reference voltage <2.4 V is required or extended temperature operation is mandatory |
Compared with TL431CDBZR, TL432CDBZTG4 enables direct use in TL432-layout designs without trace rerouting; versus TLVH431ACDBVR, it delivers tighter 0.5% tolerance and lower 2–4 µA reference current for higher-accuracy, lower-power feedback networks.
Availability
TL432CDBZTG4 is available at Aetrix Electronics and suitable for commercial power supplies, industrial control modules, and consumer electronics requiring stable component supply with guaranteed long-term sourcing.
Supply support for TL432CDBZTG4 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 technologies, with decades of expertise in precision reference design.
The TL43x family was engineered for high-accuracy voltage referencing in isolated power conversion, voltage monitoring, and feedback control systems-prioritizing thermal stability, low drift, and robust sink-current capability.
FAQ
What is the reference voltage tolerance of TL432CDBZTG4 at 25°C?
The TL432CDBZTG4 has a ±0.5% initial reference voltage tolerance at 25°C (B grade), corresponding to a 2.483–2.507 V range. This specification is verified per Section 7.11 of the SLVS543P datasheet and applies specifically to the C-grade (0°C to 70°C) and B-accuracy variant of TL432CDBZTG4.
How does the TL432CDBZTG4 pinout differ from TL431 in SOT-23-3 package?
In the SOT-23-3 (DBZ) package, TL432CDBZTG4 uses Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE; TL431 uses Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. This inversion is explicitly documented in the "Pin Configuration and Functions" section of the TL431/TL432 datasheet and affects schematic symbol placement and PCB routing.
What is the maximum cathode voltage rating for TL432CDBZTG4?
The absolute maximum cathode-to-anode voltage (VKA) for TL432CDBZTG4 is 37 V, with recommended operating range from Vref (≈2.5 V) to 36 V. Exceeding 37 V risks permanent device damage, as specified in Section 7.1 "Absolute Maximum Ratings" of the official datasheet.
Can TL432CDBZTG4 replace a Zener diode in voltage regulation circuits?
Yes, TL432CDBZTG4 is explicitly designed as a Zener diode replacement, offering superior thermal stability (≤6 mV drift over 0°C–70°C), sharper turn-on, and adjustable output (2.5 V to 36 V). Its 0.2 Ω dynamic impedance and 1–100 mA sink capability enable more precise and stable regulation than standard Zeners.
What is the typical reference input current (Iref) for TL432CDBZTG4?
The typical reference input current (Iref) for TL432CDBZTG4 is 2–4 µA at 25°C with 10 mA cathode current and 10 kΩ upper divider resistor, per Section 7.5 "Electrical Characteristics, TL431C, TL432C". This low Iref minimizes power loss and voltage error in resistor-divider networks.
TL432CDBZTG4 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432CDBZTG4 FAQ
1.How can I place an order for TL432CDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432CDBZTG4 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 TL432CDBZTG4 reliable?
The price and inventory of TL432CDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432CDBZTG4 is usually 5 days.
3.What payment methods are accepted for TL432CDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432CDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432CDBZTG4?
TL432CDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432CDBZTG4 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 TL432CDBZTG4?
For technical support, including TL432CDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432CDBZTG4 requirements.
6.How does Aetrix verify that TL432CDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TL432CDBZTG4 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 TL432CDBZTG4 meets industry standards.
7.What is the process for return or replacement of TL432CDBZTG4?
All TL432CDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432CDBZTG4, 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 TL432CDBZTG4 part is unused and in its original packaging.
Return procedure for TL432CDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432CDBZTG4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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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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