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Texas Instruments TLVH432AIDBZTG4
- Part No.:
- TLVH432AIDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432AIDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,041
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Product details
Overview
TLVH432AIDBZTG4 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.
For engineers reviewing the TLVH432AIDBZTG4 datasheet, TLVH432AIDBZTG4 pinout, TLVH432AIDBZTG4 application, or TLVH432AIDBZTG4 equivalent, key selection criteria include reference tolerance grade (A = 1%), cathode-to-anode voltage headroom (≥1.24 V), minimum regulation current (100 μA), thermal stability over industrial temperature range, and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH432AIDBZTG4 implements a 3-terminal shunt-regulator architecture 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 reference, while closed-loop configuration with two resistors sets output voltage from 1.24 V to 18 V.
Unlike the TLVH431, the TLVH432AIDBZTG4 uses reversed pinout (REF–CATHODE–ANODE) in SOT-23-3, enabling direct replacement in space-constrained designs where anode-grounded topology simplifies PCB layout. It requires no external compensation capacitor for stability across its full operating current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - defines minimum regulation threshold and sets accuracy baseline for adjustable output configurations |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power monitoring and robust shunt regulation in high-current SMPS applications |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under varying load conditions in feedback networks |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments without derating |
| Output Voltage Range | 1.24 V to 18 V - achieved via external resistor divider, enabling flexible rail sensing and programmable clamp levels |
| Reference Input Current | 0.1–0.5 μA - minimizes divider network power loss and enables high-impedance voltage sensing |
| Line Regulation | –1.5 to –2.7 mV/V - quantifies reference voltage drift versus cathode voltage changes, critical for wide-input-range supplies |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size) with gull-wing leads, optimized for automated assembly and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference input | High-impedance node comparing external voltage to internal 1.24 V reference; requires ≥0.1 μA bias current |
| 2 - CATHODE | Shunt current sink | Primary output terminal; sinks current to maintain regulated voltage at REF pin when feedback loop is closed |
| 3 - ANODE | Common return | Ground reference for internal circuitry; must be connected to system ground or lowest potential point in shunt path |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V cathode-to-anode headroom - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 fails |
| Ultra-low reference current | 0.1–0.5 μA - reduces power loss in high-resistance feedback dividers and extends battery life in portable monitors |
| Wide cathode current range | 100 μA to 70 mA - supports both microamp-level voltage supervision and milliamp-level shunt regulation without external amplification |
| Stable without output capacitor | Internally compensated - eliminates need for stability-critical cathode-to-anode capacitor, reducing BOM count and board area |
| Reversed SOT-23 pinout | REF–CATHODE–ANODE sequence - simplifies routing in anode-grounded topologies and avoids trace crossovers in compact layouts |
Applications
| Secondary-Side Flyback Regulation | Voltage Rail Monitoring |
|---|---|
Use Scenario: Isolated 3.3 V DC-DC converter using optocoupler feedback in AC/DC adapters or PoE-powered devices. IC Role / Device Role / Timing Role: Error amplifier and precision reference in secondary-side feedback loop, comparing sensed output to 1.24 V reference. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto LED drop), improving efficiency and reducing heat in low-voltage isolated supplies. | Use Scenario: Real-time monitoring of 5 V, 12 V, or 24 V power rails in PLC I/O modules or motor drives. IC Role / Device Role / Timing Role: Adjustable voltage supervisor acting as comparator with integrated reference, triggering fault signals on undervoltage events. Use Value: Eliminates external reference IC and reduces component count by 2–3 parts per monitored rail while maintaining ±1% trip accuracy. |
| Zener Diode Replacement | Adjustable Data Converter Reference |
Use Scenario: On-board 3.3 V LDO bypass or local regulation for analog sensor signal chains in automotive ECUs. IC Role / Device Role / Timing Role: Precision shunt regulator replacing discrete Zener diodes with higher accuracy and lower leakage. Use Value: Reduces leakage current by >90% vs. 3.3 V Zener (0.02–0.1 μA off-state vs. >10 μA), improving standby power and long-term stability. | Use Scenario: External reference for 12-bit to 16-bit SAR or delta-sigma ADCs in test equipment and medical instrumentation. IC Role / Device Role / Timing Role: Programmable voltage reference source set to exact ADC full-scale voltage (e.g., 2.5 V, 4.096 V) via resistor divider. Use Value: Delivers <10 ppm/°C tempco and <0.25 Ω output impedance - maintains ENOB within datasheet spec across temperature and load variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBZRG4 | Same A-grade tolerance and SOT-23-3 package, but standard TLVH431 pinout (CATHODE–REF–ANODE) | Requires PCB layout revision due to reversed REF/CATHODE positions; identical electrical performance otherwise | Select when redesigning legacy TLVH431 layouts or when anode-referenced feedback topology is preferred |
| TLVH432AQDBZR | B-grade (0.5% initial tolerance), same pinout and package, wider temperature range (–40°C to +125°C) | Higher accuracy required for precision measurement or calibration-critical systems; same footprint and drive capability | Select when tighter reference accuracy directly impacts system-level measurement uncertainty budget |
Compared with TLVH432AIDBZTG4, TLVH431AIDBZRG4 demands PCB rework for pin compatibility but offers identical regulation performance, while TLVH432AQDBZR trades cost for 0.5% tolerance and extended temperature validation-critical for metrology-grade references.
Availability
TLVH432AIDBZTG4 is available at Aetrix Electronics and suitable for secondary-side flyback regulation, voltage rail monitoring, Zener diode replacement, and adjustable data converter reference applications requiring stable component supply across automotive, industrial, and telecom end markets.
Supply support for TLVH432AIDBZTG4 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 with emphasis on reliability, longevity, and design-in support.
The TLVH432AIDBZTG4 belongs to TI's precision shunt regulator product line, engineered specifically for low-voltage, high-accuracy feedback and supervision in isolated power supplies and industrial control systems.
FAQ
What is the reference voltage tolerance of TLVH432AIDBZTG4 at 25°C?
The TLVH432AIDBZTG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to the 'A' grade designation in its part number. This means its VREF is guaranteed between 1.228 V and 1.252 V under nominal conditions, as confirmed in Section 5.6 of the official datasheet. The TLVH432AIDBZTG4 maintains this accuracy across its full operating temperature range with specified deviation limits.
How does the pinout of TLVH432AIDBZTG4 differ from TLVH431 variants?
The TLVH432AIDBZTG4 uses a reversed SOT-23-3 pinout: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. In contrast, TLVH431 variants use Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This difference is explicitly documented in Figures 4-4 and 4-5 of the datasheet and affects PCB layout compatibility-TLVH432AIDBZTG4 cannot be substituted into TLVH431 footprints without trace modification.
What is the minimum cathode current required for regulation in TLVH432AIDBZTG4?
The TLVH432AIDBZTG4 requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 (IK(min)) of the datasheet. Below this threshold, the device exits its linear operating region and loses regulation accuracy. This value is valid across the full temperature range and is lower than the TL431's 1 mA requirement, enabling ultra-low-power supervision applications.
Can TLVH432AIDBZTG4 operate without an output capacitor?
Yes, TLVH432AIDBZTG4 is internally compensated and stable without an external cathode-to-anode capacitor, as stated in Section 7.3 of the datasheet. This eliminates a common failure point and reduces bill-of-materials cost. However, if a capacitor is added for noise filtering, Figures 5-15 through 5-17 provide phase-margin guidance for selecting values up to 10 nF depending on cathode voltage and load conditions.
What is the dynamic impedance specification for TLVH432AIDBZTG4?
The TLVH432AIDBZTG4 has a typical dynamic impedance of 0.25 Ω, with a maximum of 0.4 Ω, measured at f ≤ 1 kHz and cathode current from 0.1 mA to 70 mA (Section 5.5, |zKA|). This low impedance ensures minimal output voltage variation under dynamic load steps-a key advantage over discrete Zener diodes and essential for precision feedback in switching regulators.
TLVH432AIDBZTG4 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
TLVH432AIDBZTG4 FAQ
1.How can I place an order for TLVH432AIDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432AIDBZTG4 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 TLVH432AIDBZTG4 reliable?
The price and inventory of TLVH432AIDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432AIDBZTG4 is usually 5 days.
3.What payment methods are accepted for TLVH432AIDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432AIDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH432AIDBZTG4?
TLVH432AIDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432AIDBZTG4 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 TLVH432AIDBZTG4?
For technical support, including TLVH432AIDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432AIDBZTG4 requirements.
6.How does Aetrix verify that TLVH432AIDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH432AIDBZTG4 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 TLVH432AIDBZTG4 meets industry standards.
7.What is the process for return or replacement of TLVH432AIDBZTG4?
All TLVH432AIDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432AIDBZTG4, 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 TLVH432AIDBZTG4 part is unused and in its original packaging.
Return procedure for TLVH432AIDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432AIDBZTG4 Tags
-
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
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AZ431LANTR-G1
Diodes Incorporated
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