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Texas Instruments TL432AIDBZRG4
- Part No.:
- TL432AIDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432AIDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TL432AIDBZRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 1% initial reference voltage tolerance at 25°C, adjustable output from 2.495 V to 36 V, and operation across −40°C to 85°C. It delivers 0.2 Ω typical dynamic impedance and supports 1–100 mA sink current, widely used in feedback loops of isolated DC/DC converters and notebook power adapters.
For engineers reviewing the TL432AIDBZRG4 datasheet, TL432AIDBZRG4 pinout, TL432AIDBZRG4 application, or TL432AIDBZRG4 equivalent, key selection criteria include reference accuracy grade (A), temperature range (I-grade), SOT-23-3 footprint compatibility, cathode current capability, and dynamic impedance for loop stability in switching regulator designs.
Technical Context
The TL432AIDBZRG4 implements a three-terminal adjustable shunt regulator architecture with an internal precision op-amp and NPN pass transistor. Its reference input (REF) compares against an internal 2.495 V bandgap, controlling cathode current flow between CATHODE and ANODE terminals to maintain regulated voltage across external resistive dividers.
This device shares identical electrical specifications with TL431 but uses a distinct SOT-23-3 pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - differing from TL431's Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. It is rated for industrial temperature operation (−40°C to +85°C) and supports stable regulation down to 1 mA cathode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets minimum output voltage threshold in adjustable regulator feedback networks |
| Output Voltage Range | 2.495 V to 36 V - enabled by two external resistors; defines usable span for isolated flyback or forward converter VOUT programming |
| Temp Range | −40°C to +85°C - qualified for industrial ambient environments without derating in standard PCB layouts |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal AC error injection into feedback path, critical for high-frequency switching regulator stability |
| Cathode Current | 1 mA to 100 mA - supports direct optocoupler LED drive in secondary-side regulation without external buffer transistor |
| Reference Input Current | 2–4 µA - enables high-impedance voltage divider design (e.g., 1 MΩ/100 kΩ), reducing standby power loss |
| Temp Drift (VI(dev)) | 14 mV max over full range - translates to ~17 ppm/°C typical drift, suitable for applications requiring <0.5% total output variation |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Thermal resistance RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current output node | Connects to switched node (e.g., optocoupler anode or error amplifier output); sinks current to regulate voltage |
| REF (Pin 2) | Reference input | High-impedance sense point tied to resistor divider midpoint; triggers regulation when voltage ≥2.495 V |
| ANODE (Pin 3) | Common return | Typically connected to system ground or power supply return; serves as voltage reference for REF and current sink path |
Key Features
| Feature | Design Value |
|---|---|
| 1% initial accuracy (A grade) | Reduces need for post-production trimming in mid-precision power supplies, lowering calibration cost |
| 0.2 Ω dynamic impedance | Minimizes phase shift in feedback loop, enabling stable compensation with smaller compensation capacitors |
| Low 2–4 µA reference current | Permits use of megaohm-level feedback dividers, cutting no-load power consumption below 100 µW |
| −40°C to +85°C operation | Validates performance in uncontrolled industrial enclosures without thermal management overhead |
| Pinout optimized for TL432 family | Enables drop-in replacement where TL431's pinout causes layout conflict, especially in dense SMT designs |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated 48 V to 12 V/5 V DC/DC modules for telecom server shelves. IC Role / Device Role / Timing Role: Shunt reference providing precise feedback to optocoupler-driven primary controller. Use Value: 1% reference accuracy maintains output regulation within ±1.2% across line/load/temperature, meeting PICMG 3.0 spec. | Use Scenario: Output voltage regulation in DIN-rail mounted 24 V AC/DC power supplies for PLC I/O modules. IC Role / Device Role / Timing Role: Adjustable shunt reference setting regulated 24 V rail via resistor divider and TL432-based error amplifier. Use Value: 0.2 Ω dynamic impedance prevents instability with 10–100 µF output capacitance common in industrial SMPS designs. |
| AC Inverter & VF Drives | Notebook PC Power Adapter |
Use Scenario: DC bus voltage monitoring and overvoltage protection threshold generation in 3-phase motor drives. IC Role / Device Role / Timing Role: Precision reference input to comparator circuit detecting >400 V DC bus faults. Use Value: 14 mV max temp drift ensures OVP trip point remains within ±0.5% over −25°C to +70°C ambient, avoiding nuisance trips. | Use Scenario: Feedback reference in 19 V, 65 W flyback adapter with QR controller and optocoupler isolation. IC Role / Device Role / Timing Role: Shunt regulator establishing 2.495 V reference for optocoupler LED current control. Use Value: 1–100 mA cathode current range directly drives PC817/PC817x optocouplers without buffering, simplifying BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AIDBZR | Same A-grade accuracy and SOT-23-3 package, but TL431 pinout (Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE) | Requires PCB layout revision due to reversed pin assignment; not drop-in compatible | Select only if redesigning board or reusing existing TL431 layout |
| TLVH431AILP | Lower 0.5% initial accuracy (B grade), wider 1.24 V reference, higher 10 µA reference current, same SOT-23-3 footprint | Better suited for low-voltage systems (<5 V); less optimal for 12–24 V industrial rails due to higher IREF and tighter tolerance mismatch | Prefer for battery-powered or ultra-low-power designs where 1.24 V reference is acceptable |
Compared with TL431AIDBZR, TL432AIDBZRG4 avoids layout rework in new designs using its dedicated pinout; versus TLVH431AILP, it offers superior accuracy and lower reference current for industrial 24 V systems, though at higher minimum cathode current requirement.
Availability
TL432AIDBZRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and notebook PC power adapter designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TL432AIDBZRG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The TL432 product line delivers precision shunt references optimized for feedback-loop stability and layout flexibility in isolated power conversion, targeting cost-sensitive yet performance-critical industrial and computing power supplies.
FAQ
What is the reference voltage tolerance of TL432AIDBZRG4 at 25°C?
The TL432AIDBZRG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a nominal 2.495 V output ranging from 2.470 V to 2.520 V under specified test conditions (VKA = Vref, IKA = 10 mA). This A-grade accuracy is confirmed in Section 6.8 of the TI SLVS543S datasheet and applies specifically to the TL432A variant in SOT-23-3 packaging.
How does TL432AIDBZRG4 differ from TL431 in pin configuration?
The TL432AIDBZRG4 uses a unique SOT-23-3 pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. In contrast, TL431 in the same package assigns Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. This reversal means TL432AIDBZRG4 is not pin-compatible with TL431 - direct substitution requires PCB layout modification to avoid functional failure.
What is the minimum cathode current required for regulation in TL432AIDBZRG4?
The TL432AIDBZRG4 requires a minimum cathode current of 0.4 mA to maintain regulation, with a typical value of 0.6 mA under recommended operating conditions (VKA = Vref). This parameter is specified in Sections 6.8–6.10 of the datasheet and ensures stable operation even in low-power standby modes of switching power supplies.
Can TL432AIDBZRG4 operate in automotive temperature ranges?
No, TL432AIDBZRG4 is rated for industrial temperature range only (−40°C to +85°C), designated by the "I" suffix. Automotive-grade operation (−40°C to +125°C) requires the TL432BQ or TL432AQ variants. Using TL432AIDBZRG4 beyond +85°C risks parametric shift and potential loss of regulation integrity.
What is the dynamic impedance of TL432AIDBZRG4 and why does it matter?
The TL432AIDBZRG4 exhibits 0.2 Ω typical dynamic impedance (|ZKA|) at frequencies ≤1 kHz and cathode currents from 1 mA to 100 mA. This low value minimizes AC voltage perturbation on the reference node during transient load events, directly improving phase margin and reducing need for large compensation capacitors in feedback networks of switching regulators.
TL432AIDBZRG4 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:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432AIDBZRG4 FAQ
1.How can I place an order for TL432AIDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AIDBZRG4 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 TL432AIDBZRG4 reliable?
The price and inventory of TL432AIDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AIDBZRG4 is usually 5 days.
3.What payment methods are accepted for TL432AIDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AIDBZRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AIDBZRG4?
TL432AIDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AIDBZRG4 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 TL432AIDBZRG4?
For technical support, including TL432AIDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AIDBZRG4 requirements.
6.How does Aetrix verify that TL432AIDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TL432AIDBZRG4 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 TL432AIDBZRG4 meets industry standards.
7.What is the process for return or replacement of TL432AIDBZRG4?
All TL432AIDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432AIDBZRG4, 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 TL432AIDBZRG4 part is unused and in its original packaging.
Return procedure for TL432AIDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AIDBZRG4 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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