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Texas Instruments TLVH432BCDBZTG4
- Part No.:
- TLVH432BCDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432BCDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,196
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Product details
Overview
TLVH432BCDBZTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, and operation down to 1.24 V cathode-to-anode voltage. It delivers 100 μA to 70 mA cathode current, features 0.25 Ω typical dynamic impedance, and supports –40°C to +125°C operation. It serves as a Zener replacement and voltage reference in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH432BCDBZTG4 datasheet, TLVH432BCDBZTG4 pinout, TLVH432BCDBZTG4 application, or TLVH432BCDBZTG4 equivalent, key selection criteria include reference accuracy grade (B), SOT-23-3 package pin configuration, cathode current range, thermal stability across industrial/automotive temperature ranges, and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH432BCDBZTG4 implements a three-terminal shunt-regulator architecture with an internal 1.24 V bandgap reference and high-gain error amplifier driving a Darlington output stage. Its open-loop comparator mode enables precise voltage monitoring without external reference components.
In closed-loop configuration, it functions as an adjustable shunt regulator where output voltage is set via two external resistors between cathode and reference pins, enabling regulation from 1.24 V to 18 V. The device is internally compensated and stable without output capacitance, though phase margin vs. capacitive load is characterized for design guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - sets minimum regulation threshold and defines accuracy of adjustable output voltage |
| Cathode Current Range | 100 μA to 70 mA - determines minimum bias requirement and maximum shunt power handling capability |
| Dynamic Impedance | 0.25 Ω typical - ensures tight regulation under varying load conditions with minimal output voltage deviation |
| Operating Temperature | –40°C to +125°C - supports automotive and industrial applications requiring extended thermal reliability |
| Output Voltage Range | 1.24 V to 18 V - achieved via external resistor divider, enabling flexible system-level voltage setting |
| Reference Input Current | 0.1–0.5 μA - imposes negligible loading on feedback network, preserving divider accuracy |
| VKA Sensitivity | –1.5 to –2.7 mV/V - quantifies reference voltage drift versus cathode voltage variation, critical for high-accuracy designs |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size) with gull-wing leads; compact footprint suitable for space-constrained power management layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference input | High-impedance node sensing feedback voltage; must be connected externally to cathode via resistor divider to enable regulation |
| 2 - CATHODE | Shunt current output | Sinks current to maintain regulated voltage; connects to supply rail or optocoupler LED anode in isolated SMPS |
| 3 - ANODE | Common return | Typically grounded or connected to lowest system potential; serves as reference point for all internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V cathode-to-anode - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 cannot function |
| 0.5% initial reference tolerance | B-grade accuracy - reduces need for post-manufacturing calibration in precision voltage monitoring and data converter references |
| Ultra-low reference input current | ≤0.5 μA - minimizes resistor-divider power loss and voltage error, improving efficiency and accuracy in battery-powered devices |
| Wide cathode current range | 100 μA to 70 mA - supports both micro-power monitoring and high-current shunt regulation without external amplification |
| Stable without output capacitor | Internally compensated - eliminates BOM cost and layout area for stabilization capacitor in most applications |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Provides precise, low-drift reference voltage for SAR and delta-sigma ADCs/DACs in instrumentation and sensor interfaces. IC Role / Device Role / Timing Role: Shunt regulator acting as programmable reference source; replaces discrete Zener + op-amp combinations. Use Value: 0.5% tolerance and –40°C to +125°C stability ensure consistent converter LSB accuracy across environmental conditions. | Use Scenario: Implements isolated feedback loop in 3.3 V/5 V flyback converters using optocoupler-coupled error signal. IC Role / Device Role / Timing Role: Error amplifier and voltage reference combined in single device; regulates output by adjusting optocoupler LED current. Use Value: 1.24 V reference enables regulation of sub-3 V outputs (e.g., 2.7 V) unattainable with TL431-based solutions. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replaces 1.2–1.5 V Zener diodes in on-board LDO supervision and low-voltage bias generation. IC Role / Device Role / Timing Role: Precision shunt element with sharp turn-on characteristic and ultra-low leakage (<0.1 μA off-state). Use Value: 0.25 Ω dynamic impedance yields <1 mV load regulation error over 10–100 mA cathode current swing. | Use Scenario: Monitors 1.8 V, 2.5 V, or 3.3 V rails for undervoltage lockout or fault detection in microcontroller systems. IC Role / Device Role / Timing Role: Comparator with integrated reference; triggers reset or alert when rail drops below threshold. Use Value: Open-loop gain >100 dB and 0.5 μA reference current allow direct connection to rail without attenuation or buffering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432ACDBZTG4 | 1% reference voltage tolerance at 25°C vs. 0.5% for TLVH432BCDBZTG4 | Acceptable where ±1% system-level voltage accuracy suffices, e.g., non-precision power sequencing | Select when cost sensitivity outweighs need for highest reference accuracy |
| TLVH432BIDBZT | Same 0.5% tolerance but rated for –40°C to +125°C with different packaging (no G4 suffix indicating tape-and-reel standardization) | Identical electrical performance; differs only in packaging and reel specification compliance | Choose when full automotive temperature range is required and TI's standard tape-and-reel format is not mandatory |
Compared with TLVH432ACDBZTG4, the TLVH432BCDBZTG4 provides tighter reference accuracy critical for high-resolution data acquisition; compared with TLVH432BIDBZT, it offers identical B-grade tolerance and Q-temp rating but with TI's standard G4 tape-and-reel packaging for automated assembly compatibility.
Availability
TLVH432BCDBZTG4 is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision voltage monitoring, and data converter reference applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH432BCDBZTG4 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 power management, signal chain, and high-reliability ICs.
The TLVH432BCDBZTG4 belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy voltage reference and error amplification in isolated and non-isolated power conversion systems.
FAQ
What is the reference voltage tolerance of TLVH432BCDBZTG4 at 25°C?
The TLVH432BCDBZTG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal reference with a range of 1.234 V to 1.246 V. This B-grade accuracy is confirmed in Section 5.7 of the official TI datasheet SLVS555N. The TLVH432BCDBZTG4 maintains this tolerance across its full operating temperature range when used within recommended conditions.
How does TLVH432BCDBZTG4 differ from TLVH431BCDBZTG4?
The TLVH432BCDBZTG4 and TLVH431BCDBZTG4 share identical electrical specifications including reference voltage, tolerance, and cathode current range, but differ exclusively in pinout: TLVH432BCDBZTG4 uses REF–CATHODE–ANODE (1–2–3), while TLVH431BCDBZTG4 uses CATHODE–REF–ANODE (1–2–3). This difference is documented in Figures 4-4 and 4-5 of the TI datasheet and requires PCB layout revision if substituting one for the other.
Can TLVH432BCDBZTG4 operate with cathode voltage below 1.24 V?
No - the TLVH432BCDBZTG4 requires a minimum cathode-to-anode voltage of 1.24 V to enter regulation, as stated in the "Low-voltage operation" feature and Section 5.3 Recommended Operating Conditions. Below this threshold, the device remains in cutoff with off-state cathode current ≤0.1 μA. Attempting operation below 1.24 V results in no regulation and undefined output behavior.
What is the minimum cathode current required for regulation in TLVH432BCDBZTG4?
The TLVH432BCDBZTG4 requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 Electrical Characteristics (IK(min) = 60–100 μA, with 100 μA being the maximum value across grades and temperatures). Supplying less than 100 μA may cause loss of regulation, increased output impedance, or unstable operation - verified in Figure 5-5 and Section 7.1 Overview of the TLVH432BCDBZTG4 datasheet.
Is TLVH432BCDBZTG4 stable without an output capacitor?
Yes - the TLVH432BCDBZTG4 is internally compensated and stable without an output capacitor between cathode and anode, as explicitly stated in Section 7.3 Feature Description. However, if an output capacitor is added for noise filtering or transient response improvement, Figures 5-15 through 5-17 provide phase margin vs. capacitive load data to guide selection and avoid instability in the TLVH432BCDBZTG4 application.
TLVH432BCDBZTG4 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:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH432BCDBZTG4 FAQ
1.How can I place an order for TLVH432BCDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432BCDBZTG4 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 TLVH432BCDBZTG4 reliable?
The price and inventory of TLVH432BCDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432BCDBZTG4 is usually 5 days.
3.What payment methods are accepted for TLVH432BCDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432BCDBZTG4 transactions.
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4.How is shipping managed for TLVH432BCDBZTG4?
TLVH432BCDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432BCDBZTG4 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 TLVH432BCDBZTG4?
For technical support, including TLVH432BCDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432BCDBZTG4 requirements.
6.How does Aetrix verify that TLVH432BCDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH432BCDBZTG4 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 TLVH432BCDBZTG4 meets industry standards.
7.What is the process for return or replacement of TLVH432BCDBZTG4?
All TLVH432BCDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432BCDBZTG4, 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 TLVH432BCDBZTG4 part is unused and in its original packaging.
Return procedure for TLVH432BCDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432BCDBZTG4 Tags
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