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Texas Instruments TL432CDBVRE4
- Part No.:
- TL432CDBVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432CDBVRE4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,066
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Product details
Overview
TL432CDBVRE4 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 isolated flyback SMPSs.
For engineers reviewing the TL432CDBVRE4 datasheet, TL432CDBVRE4 pinout, TL432CDBVRE4 application, or TL432CDBVRE4 equivalent, key selection factors include its C-grade temperature range (0°C to 70°C), SOT-23-3 pinout (CATHODE–REF–ANODE), low output impedance for stable feedback loops, and compatibility with Zener-replacement topologies requiring tight initial accuracy and low thermal drift.
Technical Context
The TL432CDBVRE4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN output stage. Its REF pin senses voltage relative to ANODE, enabling precise threshold detection and closed-loop regulation when paired with external resistive dividers.
Unlike the TL431, the TL432 variant uses a distinct pinout in SOT-23-3: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - a configuration optimized for compact feedback networks where cathode connects directly to the power rail being regulated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (nominal); enables accurate 2.5 V–36 V adjustable output setting via two external resistors |
| Initial Tolerance | ±0.5% at 25°C (B grade); ensures minimal calibration burden in precision voltage monitoring circuits |
| Temp Range | 0°C to 70°C (C grade); suitable for commercial ambient environments without extended industrial or automotive thermal stress |
| Temp Drift | ≤6 mV over full range; translates to <±25 ppm/°C typical drift, critical for stable feedback in unregulated input conditions |
| Dynamic Impedance | 0.2 Ω typical; provides low-impedance reference node to suppress noise coupling into control loop |
| Sink Current | 1–100 mA; supports direct drive of optocoupler LEDs in isolated SMPS feedback paths without external amplification |
| Output Noise | Low (unspecified µVRMS, but characterized as "low" per datasheet); reduces jitter in voltage-monitoring comparators |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body size), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: CATHODE | Shunt current input / voltage sensing node | Connects to regulated rail or optocoupler anode; carries full sink current; voltage must stay ≤37 V above ANODE |
| Pin 2: REF | Reference input threshold | Senses voltage relative to ANODE; triggers regulation when voltage ≥2.495 V; high-impedance (4 µA max IREF) |
| Pin 3: ANODE | Common return / ground reference | Typically tied to system ground or power supply return; all voltages referenced to this pin; must be stable and low-noise |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 2.5 V to 36 V set by two external resistors - eliminates need for multiple fixed-voltage references |
| Sharp Turn-On Characteristic | Active output circuitry delivers fast, clean regulation onset - improves transient response vs. passive Zener diodes |
| Zener Replacement Capability | Direct drop-in substitute for 2.5 V Zeners with superior stability, lower impedance, and tighter tolerance |
| Low Reference Input Current | 2–4 µA typical - minimizes resistor-divider loading error and enables high-impedance sensing networks |
| Stable Operation Across Temp | Specified performance over 0°C to 70°C with ≤6 mV total drift - ensures consistent regulation in office/indoor equipment |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Feedback path in isolated flyback converter where TL432CDBVRE4 senses output voltage via resistive divider and drives optocoupler LED. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.495 V threshold to close voltage regulation loop across transformer barrier. Use Value: Enables ±1% output voltage accuracy over line/load/temp without secondary-side LDO, reducing BOM count and board space. | Use Scenario: Replacing 2.5 V Zener diode in low-power voltage clamp or reference node for ADC biasing. IC Role / Device Role / Timing Role: Active shunt regulator offering lower dynamic impedance (0.2 Ω vs. ~10 Ω for Zener) and tighter initial tolerance (±0.5% vs. ±5%). Use Value: Improves measurement repeatability in sensor signal conditioning by reducing reference voltage drift under varying load currents. |
| Voltage Monitoring | Comparator with Integrated Reference |
Use Scenario: Undervoltage lockout (UVLO) circuit monitoring 12 V rail in embedded power supply. IC Role / Device Role / Timing Role: Programmable threshold detector: REF pin compares divided rail voltage against internal 2.495 V reference. Use Value: Eliminates need for external precision reference IC and comparator, simplifying UVLO design while maintaining ±1% trip-point accuracy. | Use Scenario: Single-supply comparator application where TL432CDBVRE4 supplies reference and sinks comparator output current. IC Role / Device Role / Timing Role: Dual-function device acting as both reference source and active pull-down load for open-collector comparator outputs. Use Value: Reduces component count in battery-monitoring circuits by integrating reference and interface logic in one SOT-23-3 device. |
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 electrical specs and C-grade temp range, but SOT-23-3 pinout is CATHODE–ANODE–REF (Pin 1=CATHODE, Pin 2=ANODE, Pin 3=REF) | Requires PCB layout revision due to reversed ANODE/REF pin positions; not pin-compatible | Select only if redesigning layout to accommodate TL431's alternate pinout and leveraging existing TL431 design documentation |
| TLVH431ACDBVR | Lower 1.24 V reference voltage, 1% initial tolerance, 0.5 Ω dynamic impedance, same SOT-23-3 package | Better suited for low-voltage systems (<5 V); less suitable for 12 V+ regulation due to limited headroom | Choose when designing new low-voltage feedback paths needing sub-2.5 V reference; avoid for legacy 2.5 V–36 V TL432-based designs |
Compared with TL431CDBVR and TLVH431ACDBVR, TL432CDBVRE4 offers identical B-grade accuracy and C-temp operation but with a dedicated SOT-23-3 pinout optimized for cathode-to-rail connection - making it preferable for flyback optocoupler interfaces where cathode routing dominates layout constraints.
Availability
TL432CDBVRE4 is available at Aetrix Electronics and suitable for commercial power supplies, embedded voltage monitors, Zener-replacement circuits, and isolated feedback networks requiring stable component supply and long-term manufacturability.
Supply support for TL432CDBVRE4 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 precision analog ICs and power management solutions.
The TL43x family was designed for high-accuracy, low-drift voltage referencing in cost-sensitive power conversion and monitoring applications - emphasizing pin efficiency, thermal stability, and Zener replacement capability.
FAQ
What is the exact pinout configuration of TL432CDBVRE4 in SOT-23-3?
TL432CDBVRE4 uses Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - confirmed in TI's SLVS543P datasheet Figure 6 (TL432 DBZ top view). This differs from TL431's SOT-23-3 pinout (CATHODE–ANODE–REF) and is essential for correct PCB layout. The ANODE must be connected to system ground or common return, and REF senses voltage relative to that node.
Does TL432CDBVRE4 support operation beyond 36 V cathode-to-anode voltage?
No. TL432CDBVRE4 has an absolute maximum cathode-to-anode voltage (VK A) of 37 V per Section 7.1 of the datasheet. Operating above 36 V violates recommended conditions and risks permanent damage. For higher-voltage applications, external series limiting or clamping is required - TL432CDBVRE4 itself is not rated for sustained >36 V operation.
What is the minimum cathode current needed for TL432CDBVRE4 to maintain regulation?
TL432CDBVRE4 requires a minimum cathode current (Imin) of 0.4 mA to sustain regulation, per Section 7.5 Electrical Characteristics. Below this, the device exits regulation and output impedance rises sharply. Designers must ensure external resistor networks or load paths guarantee ≥0.4 mA sink current under all operating conditions, including light-load or startup states.
How does the temperature drift specification of TL432CDBVRE4 compare to TL432IDBVRE4?
TL432CDBVRE4 (C grade) specifies ≤6 mV total deviation over 0°C to 70°C, while TL432IDBVRE4 (I grade) allows ≤14 mV over –40°C to 85°C. The C-grade part achieves tighter drift in its narrower range, making it preferable for commercial indoor applications where ambient stays within 0–70°C and ultra-low drift is prioritized over extended temperature coverage.
Can TL432CDBVRE4 replace a standard 2.5 V Zener diode without circuit modification?
Yes - TL432CDBVRE4 is explicitly designed as a Zener replacement. With identical 3-pin SOT-23-3 footprint and compatible biasing (cathode to rail, anode to ground, ref to divider), it drops into most Zener positions. However, its 4 µA reference input current is far lower than typical Zener leakage, so existing high-value divider resistors may require adjustment to maintain regulation current ≥0.4 mA.
TL432CDBVRE4 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL432CDBVRE4 FAQ
1.How can I place an order for TL432CDBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432CDBVRE4 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 TL432CDBVRE4 reliable?
The price and inventory of TL432CDBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432CDBVRE4 is usually 5 days.
3.What payment methods are accepted for TL432CDBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432CDBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432CDBVRE4?
TL432CDBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432CDBVRE4 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 TL432CDBVRE4?
For technical support, including TL432CDBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432CDBVRE4 requirements.
6.How does Aetrix verify that TL432CDBVRE4 is sourced from the original manufacturer or authorized distributors?
All TL432CDBVRE4 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 TL432CDBVRE4 meets industry standards.
7.What is the process for return or replacement of TL432CDBVRE4?
All TL432CDBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432CDBVRE4, 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 TL432CDBVRE4 part is unused and in its original packaging.
Return procedure for TL432CDBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432CDBVRE4 Tags
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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
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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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