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Texas Instruments TL432CDBVR
- Part No.:
- TL432CDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432CDBVR.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,994
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Product details
Overview
TL432CDBVR from Texas Instruments is a precision adjustable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance at 25°C, 6 mV max temperature drift over 0°C to 70°C, and 0.2 Ω typical dynamic impedance - used for feedback regulation in isolated DC/DC converters and notebook power adapters.
For engineers reviewing the TL432CDBVR datasheet, TL432CDBVR pinout, TL432CDBVR application, or TL432CDBVR equivalent, this page provides verified electrical specifications, thermal behavior, stability boundaries, real-world use cases, and validated alternative parts for industrial power supply design and embedded voltage monitoring.
Technical Context
The TL432CDBVR implements a three-terminal shunt regulator architecture with an internal error amplifier, reference cell, and output transistor. Its REF–ANODE–CATHODE pinout (Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE) differs from TL431 but delivers identical electrical performance: adjustable output from 2.495 V to 36 V via two external resistors, with sharp turn-on and low noise.
It operates across 0°C to 70°C (C-grade), supports sink currents from 1 mA to 100 mA, and maintains stable regulation under varying cathode voltage (VKA) due to low ΔVref/ΔVKA (–1.4 to –2.7 mV/V). Its 206 °C/W junction-to-ambient thermal resistance in SOT-23-3 enables compact board-level integration without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV (0.5% tolerance at 25°C) - sets precise feedback threshold for closed-loop regulation |
| Temp Drift (0°C–70°C) | 6 mV max deviation - ensures <±0.024% output variation over full commercial temperature range |
| Dynamic Impedance | 0.2 Ω typical - minimizes output voltage perturbation during load transients in switching supplies |
| Cathode Current Range | 1 mA to 100 mA - supports direct interface with optocoupler LEDs or error amplifier outputs |
| Output Noise | Low broadband noise - critical for high-PSRR feedback paths in audio-grade or measurement power rails |
| Min Regulation Current | 0.4 mA - enables stable operation even with light-load or high-resistance divider networks |
| Off-State Leakage | 0.1 µA max at 36 V - prevents unintended conduction when disabled in standby modes |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body size), surface-mount, lead-free, RoHS-compliant. Thermal pad not present; standard reflow profile applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output node | Connects to primary-side feedback network or optocoupler anode; sinks regulated current to maintain VKA ≈ VREF × (1 + R1/R2) |
| Pin 2 (REF) | Reference input threshold | Senses voltage divider output; device regulates when REF = 2.495 V, enabling programmable output from 2.495 V to 36 V |
| Pin 3 (ANODE) | Common return / ground reference | Typically tied to system ground or secondary-side common; serves as voltage reference point for both REF and CATHODE terminals |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 2.495 V to 36 V via two external resistors - eliminates need for multiple fixed-voltage references in multi-rail systems |
| Sharp Turn-On Characteristic | Fast response to REF voltage crossing threshold - reduces regulation delay and improves transient recovery in SMPS feedback loops |
| Low Dynamic Impedance | 0.2 Ω typical - maintains tight output voltage control despite cathode current variations up to 100 mA |
| Low Reference Input Current | 2–4 µA typical - minimizes divider resistor power loss and enables high-impedance sensing in battery-powered applications |
| Stability Boundary Data | Published CL vs. IKA stability curves (Fig 6-18) - enables reliable compensation design without iterative prototyping |
Applications
| Rack Server Power | Industrial AC/DC Converters |
|---|---|
|
Use Scenario: Secondary-side voltage feedback in isolated 48 V to 12 V/5 V DC/DC modules for telecom servers. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold to optocoupler-driven error amplifier. Use Value: Enables ±1% output regulation across line/load/temperature while supporting fast transient response via low ZKA. |
Use Scenario: Output voltage regulation in DIN-rail mounted 24 V/48 V industrial power supplies. IC Role / Device Role / Timing Role: Programmable reference setting feedback point for TL494 or UC384x-based PWM controllers. Use Value: Replaces discrete Zener+transistor networks with single-component solution, reducing BOM count and improving thermal stability. |
| Notebook PC Power Adapter | Servo Drive Control Module |
|
Use Scenario: Constant-voltage regulation in flyback-based 19 V/3.35 A laptop adapters meeting CoC Tier 2 efficiency. IC Role / Device Role / Timing Role: Precision shunt reference driving optocoupler LED to close feedback loop across isolation barrier. Use Value: 6 mV temp drift ensures output stays within ±0.5% over 0°C–70°C ambient, satisfying USB PD and OEM spec limits. |
Use Scenario: Auxiliary 5 V/3.3 V rail regulation for gate driver ICs and position encoder interfaces in servo amplifiers. IC Role / Device Role / Timing Role: Low-noise, low-drift reference supplying bias to analog comparators and ADC reference buffers. Use Value: Sub-µA reference current and 0.2 Ω impedance prevent loading errors in high-resolution current-sense signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | Same SOT-23-3 package but TL431 pinout (Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE); identical electrical specs | Requires PCB layout revision due to reversed REF/ANODE/CATHODE assignment; not drop-in compatible | Select TL431CDBVR only if redesigning for legacy TL431 footprint or sourcing continuity; TL432CDBVR avoids layout conflict in new designs |
| LM4040CIM3-ADJ | Series reference (not shunt); 3-pin SOT-23; 0.5% initial accuracy; 50 ppm/°C tempco; max 25 mA output | Requires different topology (no cathode sinking); unsuitable for optocoupler feedback or high-current shunt applications | Choose LM4040CIM3-ADJ only for low-power, non-isolated, series-regulated rails where sink capability is unnecessary |
Compared with TL431CDBVR, TL432CDBVR offers identical regulation performance with inverted pinout optimized for newer layouts; compared with LM4040CIM3-ADJ, it provides higher sink current and shunt topology essential for isolated feedback, but requires external resistive programming.
Availability
TL432CDBVR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and notebook PC power adapter designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TL432CDBVR 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 and high-reliability power solutions.
The TL43x family was engineered for cost-sensitive, high-volume power regulation applications - delivering Zener-replacement performance with programmability, stability, and robustness across commercial, industrial, and automotive environments.
FAQ
What is the exact pin configuration of TL432CDBVR?
The TL432CDBVR uses SOT-23-3 package with Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This differs from TL431's pinout (REF–ANODE–CATHODE), so PCB layout must match TL432-specific assignment. The ANODE pin serves as the common reference node, and REF senses the divider voltage to regulate CATHODE current.
Does TL432CDBVR support operation above 70°C?
No - TL432CDBVR is rated for 0°C to 70°C only (C-grade). For extended temperature operation, TI offers TL432IDBVR (–40°C to 85°C) and TL432QDBVR (–40°C to 125°C). Using TL432CDBVR outside its specified range may cause reference voltage drift beyond 6 mV and reduced reliability.
Can TL432CDBVR replace a Zener diode directly?
Yes - TL432CDBVR functions as a 2.495 V programmable Zener with superior performance: sharper knee, lower dynamic impedance (0.2 Ω vs. ~10 Ω for typical Zeners), and tighter tolerance. It requires only two external resistors to set output voltage and draws minimal reference current (2–4 µA), making it ideal for precision replacements.
What is the minimum cathode current required for regulation in TL432CDBVR?
The TL432CDBVR requires ≥0.4 mA cathode current (IK) to maintain regulation. Below this threshold, the device exits active regulation and behaves like an open circuit. Designers must ensure the feedback resistor network and optocoupler LED forward current collectively meet this minimum under all operating conditions, including light-load and startup.
How does TL432CDBVR handle capacitive loads on the cathode node?
TL432CDBVR exhibits defined stability boundaries with capacitive loads: Figure 6-18 in the datasheet shows safe IKA vs. CL regions. At 10 mA cathode current, stability is maintained up to ~100 nF; beyond that, oscillation risk increases. Adding a small series resistor (e.g., 10–100 Ω) between cathode and capacitor restores phase margin in borderline cases.
TL432CDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-23-5
TL432CDBVR FAQ
1.How can I place an order for TL432CDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432CDBVR 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 TL432CDBVR reliable?
The price and inventory of TL432CDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432CDBVR is usually 5 days.
3.What payment methods are accepted for TL432CDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432CDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432CDBVR?
TL432CDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432CDBVR 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 TL432CDBVR?
For technical support, including TL432CDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432CDBVR requirements.
6.How does Aetrix verify that TL432CDBVR is sourced from the original manufacturer or authorized distributors?
All TL432CDBVR 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 TL432CDBVR meets industry standards.
7.What is the process for return or replacement of TL432CDBVR?
All TL432CDBVR units undergo pre-shipment inspection (PSI). If there is an issue with TL432CDBVR, 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 TL432CDBVR part is unused and in its original packaging.
Return procedure for TL432CDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432CDBVR 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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