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Texas Instruments TLVH432BCDBZRG4
- Part No.:
- TLVH432BCDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432BCDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,463
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Product details
Overview
TLVH432BCDBZRG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, providing 1.24 V reference voltage with ±0.5% initial tolerance at 25°C, 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It functions as an error amplifier or comparator with integrated reference in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH432BCDBZRG4 datasheet, TLVH432BCDBZRG4 pinout, TLVH432BCDBZRG4 application, or TLVH432BCDBZRG4 equivalent, key selection criteria include reference accuracy grade (B), thermal stability over industrial/automotive temperature ranges, cathode current headroom for regulation, and compatibility with optocoupler-based secondary-side control architectures.
Technical Context
The TLVH432BCDBZRG4 implements a 3-terminal shunt topology with internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. Its open-loop configuration enables precise voltage monitoring via comparator action; closed-loop operation with resistive feedback sets output voltage from 1.24 V to 18 V.
Unlike the TLVH431, the TLVH432BCDBZRG4 uses reversed pinout (REF–CATHODE–ANODE) in SOT-23-3, enabling direct replacement in designs requiring inverted terminal mapping without PCB revision. It achieves 0.25 Ω typical dynamic impedance and maintains regulation down to 100 μA cathode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - sets minimum programmable output and defines accuracy baseline for feedback networks |
| Cathode Current Range | 100 μA to 70 mA - supports low-power monitoring and high-current shunt regulation without external gain stages |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under load transients in closed-loop configurations |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error and enables high-impedance feedback networks |
| Output Voltage Range | 1.24 V to 18 V - programmable via two external resistors, compatible with 3.3 V, 5 V, and 12 V system rails |
| Supply Headroom | ≥1.24 V - operates from ultra-low input voltages, enabling use in battery-powered and energy-harvesting systems |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size) with gull-wing leads; moisture sensitivity level 1, RoHS-compliant, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: REF | Reference input | High-impedance node sensing voltage divider output; requires ≥0.1 μA bias current for proper amplifier operation |
| Pin 2: CATHODE | Shunt current sink/output | Primary current path for regulation; connects to optocoupler LED anode or feedback network output in SMPS designs |
| Pin 3: ANODE | Common return/reference ground | System ground reference point; must be tied to power rail common; no internal substrate connection in DBZ variant |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low reference voltage | 1.24 V enables regulation of sub-2 V rails where standard 2.5 V references fail |
| B-grade accuracy | ±0.5% initial tolerance reduces calibration overhead in precision power supplies and data converters |
| Wide cathode current range | 100 μA minimum ensures stable regulation in low-power standby modes without auxiliary bias |
| Inverted SOT-23 pinout | REF–CATHODE–ANODE layout simplifies PCB routing in space-constrained flyback feedback paths |
| Integrated comparator function | Eliminates need for separate reference + comparator IC in voltage-monitoring circuits |
Applications
| Isolated Flyback SMPS Feedback | Voltage Rail Monitoring |
|---|---|
Use Scenario: Secondary-side voltage sensing in 3.3 V isolated DC-DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier; compares divided output voltage against internal 1.24 V reference. Use Value: Enables stable regulation down to 2.7 V output while maintaining loop stability across –40°C to +125°C. |
Use Scenario: Real-time detection of brownout or overvoltage on 5 V or 12 V system power rails. IC Role / Device Role / Timing Role: Precision comparator with built-in reference; triggers reset or alert when rail deviates beyond threshold. Use Value: Eliminates external reference and reduces BOM count by 2–3 components versus discrete solutions. |
| Data Converter Reference | Zener Diode Replacement |
Use Scenario: Providing stable reference voltage for 12-bit SAR ADCs in industrial sensor interfaces. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference source; supplies reference input to ADC's REFIN pin. Use Value: 0.5% initial tolerance and <12 mV full-range drift ensure ≤0.5 LSB error contribution across temperature. |
Use Scenario: Replacing 3.3 V Zener diodes in LDO pre-regulator or clamp circuits. IC Role / Device Role / Timing Role: Active shunt regulator with sharp turn-on and ultra-low leakage (<0.1 μA off-state). Use Value: Reduces quiescent current by >90% versus 3.3 V Zener, extending battery life in portable instrumentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432ACDBZRG4 | ±1% reference tolerance at 25°C; otherwise identical electrical specs and pinout | Acceptable where tighter accuracy is not required, e.g., non-critical biasing or coarse monitoring | Select TLVH432ACDBZRG4 when cost sensitivity outweighs precision requirements |
| TLVH431BCDBZRG4 | Same B-grade accuracy and thermal specs, but standard SOT-23 pinout (CATHODE–ANODE–REF) | Requires PCB layout change due to reversed REF/CATHODE placement; incompatible with TLVH432 footprint | Choose TLVH431BCDBZRG4 only if legacy design uses TLVH431 pinout and board revision is feasible |
Compared with TLVH432ACDBZRG4, the TLVH432BCDBZRG4 delivers higher initial accuracy critical for closed-loop stability in low-voltage SMPS; versus TLVH431BCDBZRG4, it eliminates layout rework in new designs targeting inverted pin mapping.
Availability
TLVH432BCDBZRG4 is available at Aetrix Electronics and suitable for isolated power supplies, voltage monitoring systems, and precision data converter references requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH432BCDBZRG4 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 components.
The TLVH432BCDBZRG4 belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback and monitoring in isolated and non-isolated power systems.
FAQ
What is the reference voltage tolerance of TLVH432BCDBZRG4 at 25°C?
The TLVH432BCDBZRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.234 V to 1.246 V. This B-grade accuracy is confirmed in Section 5.7 of the official datasheet and applies across all operating conditions unless otherwise specified. The TLVH432BCDBZRG4 maintains this tolerance without requiring external calibration.
How does TLVH432BCDBZRG4 differ from TLVH431BCDBZRG4 in pin configuration?
The TLVH432BCDBZRG4 uses a REF–CATHODE–ANODE pinout in the SOT-23-3 package, whereas TLVH431BCDBZRG4 uses CATHODE–ANODE–REF. This inversion allows TLVH432BCDBZRG4 to interface directly with optocoupler anodes in flyback feedback paths without trace rerouting. Both share identical electrical characteristics, thermal ratings, and B-grade accuracy.
What is the minimum cathode current required for regulation in TLVH432BCDBZRG4?
The TLVH432BCDBZRG4 requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 of the datasheet under IK(min). This value holds across the full –40°C to +125°C temperature range and enables stable operation in low-power standby modes where traditional TL431 devices demand ≥1 mA.
Can TLVH432BCDBZRG4 replace a Zener diode in low-leakage applications?
Yes - the TLVH432BCDBZRG4 provides <0.1 μA off-state cathode current (IK(off)) at 18 V, significantly lower than typical Zener diodes. Its active regulation delivers sharper turn-on, lower dynamic impedance (0.25 Ω), and temperature-stable reference voltage, making it ideal for precision clamping and low-quiescent monitoring circuits where Zeners exhibit drift and leakage.
What is the maximum cathode voltage rating for TLVH432BCDBZRG4?
The absolute maximum cathode voltage (VKA) for TLVH432BCDBZRG4 is 20 V, per Section 5.1 of the datasheet. In recommended operation, cathode voltage may range from VREF (1.24 V) up to 18 V. Exceeding 20 V risks permanent damage, and operation above 18 V violates functional specifications even if within absolute limits.
TLVH432BCDBZRG4 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):
- 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
TLVH432BCDBZRG4 FAQ
1.How can I place an order for TLVH432BCDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432BCDBZRG4 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 TLVH432BCDBZRG4 reliable?
The price and inventory of TLVH432BCDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432BCDBZRG4 is usually 5 days.
3.What payment methods are accepted for TLVH432BCDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432BCDBZRG4 transactions.
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4.How is shipping managed for TLVH432BCDBZRG4?
TLVH432BCDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432BCDBZRG4 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 TLVH432BCDBZRG4?
For technical support, including TLVH432BCDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432BCDBZRG4 requirements.
6.How does Aetrix verify that TLVH432BCDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TLVH432BCDBZRG4 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 TLVH432BCDBZRG4 meets industry standards.
7.What is the process for return or replacement of TLVH432BCDBZRG4?
All TLVH432BCDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432BCDBZRG4, 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 TLVH432BCDBZRG4 part is unused and in its original packaging.
Return procedure for TLVH432BCDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432BCDBZRG4 Tags
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TL431AIDBZR
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LM4040CYM3-2.5-TR
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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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