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Texas Instruments TLVH432AIDBZT
- Part No.:
- TLVH432AIDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432AIDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,435
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Product details
Overview
TLVH432AIDBZT from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, featuring 1.24 V reference voltage (±1% at 25°C), 100 μA to 70 mA cathode current range, 0.25 Ω typical dynamic impedance, and operation from –40°C to +125°C. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops, replacing Zener diodes with lower leakage and sharper turn-on.
For engineers reviewing the TLVH432AIDBZT datasheet, TLVH432AIDBZT pinout, TLVH432AIDBZT application, or TLVH432AIDBZT equivalent, key selection criteria include reference tolerance grade (A = 1%), cathode-to-anode voltage range (1.24 V to 18 V), thermal stability across industrial/automotive temperature ranges, and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH432AIDBZT implements a three-terminal shunt topology with internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. Its open-loop comparator mode enables precise voltage monitoring without external references, while closed-loop configuration with two resistors sets output voltage from VREF to 18 V.
Unlike the TLVH431, the TLVH432AIDBZT uses reversed pinout (REF–CATHODE–ANODE) in SOT-23-3, enabling direct replacement in space-constrained layouts where anode grounding simplifies PCB routing. It requires ≥100 μA cathode current for regulation and exhibits <0.1 μA off-state cathode leakage at 18 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - defines minimum regulated output and sets resistor-divider ratio for adjustable voltage setting |
| Cathode Current Range | 100 μA to 70 mA - supports low-power monitoring and higher-current shunt regulation without external boost |
| Dynamic Impedance | 0.25 Ω typical - ensures stable regulation under load transients; total circuit impedance scales with external resistor values |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Output Voltage Range | 1.24 V to 18 V - set by external R1/R2 divider; enables use in 3.3 V, 5 V, 12 V, and 15 V power rails |
| Reference Input Current | 0.1–0.5 μA - minimizes divider current error and enables high-resistance feedback networks for low quiescent power |
| Line Regulation | –1.5 to –2.7 mV/V - quantifies reference voltage drift vs. cathode voltage; critical for wide-input-range SMPS designs |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference input | High-impedance node sensing voltage divider output; must be connected externally - floating connection disables regulation |
| 2 - CATHODE | Shunt current output | Sinks current to maintain REF at 1.24 V; connects to feedback node in SMPS or comparator output in monitoring circuits |
| 3 - ANODE | Common return | Typically grounded; provides reference potential for REF and cathode current path - required for proper biasing of internal amplifier |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 (2.5 V) cannot function |
| Sharp turn-on characteristic | High open-loop gain (>60 dB) - delivers fast response in overvoltage detection and comparator applications |
| Ultra-low reference current | 0.1–0.5 μA - allows >1 MΩ feedback dividers, reducing power loss and improving noise immunity |
| Stable without output capacitor | Internally compensated - eliminates need for cathode-to-anode bypass cap in most configurations, saving board space |
| Grade-A tolerance | ±1% initial accuracy at 25°C - reduces calibration overhead in precision ADC references and sensor excitation circuits |
Applications
| Isolated Flyback SMPS Feedback | Voltage Monitoring for Power Rails |
|---|---|
Use Scenario: Secondary-side voltage regulation in 3.3 V/5 V AC-DC adapters using optocoupler isolation. IC Role / Device Role / Timing Role: Error amplifier and precision reference - compares sampled output against 1.24 V internal reference and drives optocoupler LED current. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto VF) with <±1% tolerance, meeting USB PD and industrial 3.3 V rail requirements. |
Use Scenario: Real-time monitoring of 12 V automotive battery voltage with microcontroller ADC input. IC Role / Device Role / Timing Role: Adjustable threshold detector - configured as comparator with REF tied to divided battery voltage. Use Value: Triggers MCU interrupt at 11.5 V (set via R1/R2), leveraging 0.1 μA Iref to minimize loading on high-impedance divider. |
| Adjustable Data Converter Reference | Zener Diode Replacement |
Use Scenario: Providing programmable reference to 12-bit SAR ADC in portable medical sensor node. IC Role / Device Role / Timing Role: Precision voltage source - supplies stable 2.048 V reference derived from 1.24 V × (1 + R1/R2). Use Value: Achieves <0.5 LSB error over –40°C to +85°C due to ±1% VREF and <31 mV temp drift, exceeding standard Zener performance. |
Use Scenario: Replacing 3.3 V Zener in LDO feedback path of FPGA core supply. IC Role / Device Role / Timing Role: Low-leakage shunt element - regulates at 3.3 V with <0.1 μA off-state current vs. 5–10 μA for typical Zeners. Use Value: Reduces standby power by >95% and improves PSRR via 0.25 Ω dynamic impedance versus Zener's 10–50 Ω. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBZT | Same electrical specs but SOT-23-3 pinout: CATHODE–REF–ANODE (vs. REF–CATHODE–ANODE) | Requires PCB layout revision; not drop-in - used where cathode-first routing is preferred | Select when existing design uses TLVH431 pinout or when cathode connection to upstream node simplifies trace routing |
| TLV431ACDBVR | Lower max cathode voltage (6 V vs. 18 V); same 1.24 V reference and ±1% grade; SOT-23-5 package | Not suitable for >6 V rails or flyback outputs above 6 V; limited to low-voltage logic monitoring and ADC refs | Choose only for sub-6 V applications where smaller footprint (SOT-23-5) and lower cost outweigh voltage range limitation |
Compared with TLVH431AIDBZT, TLVH432AIDBZT offers reversed pinout for optimized layout in compact SMPS designs, while TLV431ACDBVR trades voltage range for cost and size in low-voltage-only systems - TLVH432AIDBZT remains optimal for 3.3–15 V isolated regulation requiring A-grade accuracy and automotive temperature support.
Availability
TLVH432AIDBZT is available at Aetrix Electronics and suitable for isolated flyback SMPS feedback, precision ADC references, automotive battery monitoring, and low-leakage Zener replacement applications requiring stable component supply across extended temperature ranges.
Supply support for TLVH432AIDBZT 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 delivering analog and embedded processing solutions, with leadership in precision analog, power management, and signal chain technologies.
The TLVH432AIDBZT belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback and voltage monitoring in space-constrained, thermally demanding applications such as automotive power supplies and industrial SMPS.
FAQ
What is the reference voltage tolerance of TLVH432AIDBZT at 25°C?
The TLVH432AIDBZT has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.228 V to 1.252 V. This A-grade specification is confirmed in Section 5.6 of the official datasheet and applies across all operating conditions unless otherwise noted. The TLVH432AIDBZT maintains this tolerance within its full industrial temperature range.
How does the pinout of TLVH432AIDBZT differ from TLVH431AIDBZT?
The TLVH432AIDBZT uses REF–CATHODE–ANODE pinout in the SOT-23-3 package, whereas TLVH431AIDBZT uses CATHODE–REF–ANODE. This reversal enables direct integration into layouts where the reference node must connect first, simplifying routing in dense flyback feedback paths. Pin mapping is verified in Figure 4-5 and the Pin Functions table of the SLVS555N datasheet.
Can TLVH432AIDBZT regulate voltages below 1.24 V?
No - the TLVH432AIDBZT cannot regulate below its internal 1.24 V reference voltage. Its minimum output is VREF, and adjustable output voltage spans only from 1.24 V to 18 V using external resistors. Attempting to set lower voltages results in loss of regulation, as confirmed in Section 3 (Description) and Figure 6-2 of the datasheet.
What is the minimum cathode current required for regulation in TLVH432AIDBZT?
The TLVH432AIDBZT requires a minimum cathode current of 100 μA to maintain regulation, as specified in Sections 5.5–5.7 under IK(min). This value is guaranteed over the full temperature range (–40°C to +125°C) and is critical for stable operation in low-power monitoring circuits. Below this threshold, gain drops and regulation degrades.
Is TLVH432AIDBZT compatible with optocoupler-based feedback in 3.3 V flyback converters?
Yes - the TLVH432AIDBZT is explicitly recommended for isolated flyback SMPS feedback, including 3.3 V systems. Its 1.24 V reference enables output regulation as low as ~2.7 V (1.24 V + optocoupler VF ≈ 1.4 V), and its high open-loop gain ensures stable loop response. Application Figure 8-1 and Section 8.1 confirm this use case with validated design examples.
TLVH432AIDBZT 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):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 70 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH432AIDBZT FAQ
1.How can I place an order for TLVH432AIDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432AIDBZT 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 TLVH432AIDBZT reliable?
The price and inventory of TLVH432AIDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432AIDBZT is usually 5 days.
3.What payment methods are accepted for TLVH432AIDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432AIDBZT transactions.
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4.How is shipping managed for TLVH432AIDBZT?
TLVH432AIDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432AIDBZT 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 TLVH432AIDBZT?
For technical support, including TLVH432AIDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432AIDBZT requirements.
6.How does Aetrix verify that TLVH432AIDBZT is sourced from the original manufacturer or authorized distributors?
All TLVH432AIDBZT 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 TLVH432AIDBZT meets industry standards.
7.What is the process for return or replacement of TLVH432AIDBZT?
All TLVH432AIDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432AIDBZT, 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 TLVH432AIDBZT part is unused and in its original packaging.
Return procedure for TLVH432AIDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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