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Texas Instruments TLVH432ACDBZRG4
- Part No.:
- TLVH432ACDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432ACDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,631
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Product details
Overview
TLVH432ACDBZRG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, providing 1.24 V reference voltage with ±1% 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 TLVH432ACDBZRG4 datasheet, TLVH432ACDBZRG4 pinout, TLVH432ACDBZRG4 application, or TLVH432ACDBZRG4 equivalent, key selection criteria include reference accuracy over temperature, dynamic impedance (0.25 Ω), minimum cathode current (100 μA), and compatibility with optocoupler-based secondary-side regulation in 3.3 V systems.
Technical Context
The TLVH432ACDBZRG4 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 operation enables comparator functionality with built-in threshold; closed-loop configuration with external resistors sets output voltage from VREF to 18 V.
Unlike the TLVH431, the TLVH432 variant uses reversed pinout in SOT-23-3 (REF–CATHODE–ANODE) and SOT-89 packages, enabling direct integration into legacy layouts requiring cathode-to-ground topology. Thermal stability is specified across –40°C to +125°C with typical VREF drift of ±11 mV for Q-grade devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - defines minimum programmable output and sets accuracy baseline for voltage monitoring or regulation. |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power biasing and high-current shunt regulation without external amplification. |
| Dynamic Impedance | 0.25 Ω typical - ensures stable regulation under load transients; total circuit impedance scales with external resistor ratio. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments without derating. |
| VREF vs Cathode Voltage | –1.5 to –2.7 mV/V - quantifies reference voltage sensitivity to cathode supply variation; critical for unregulated input rails. |
| Reference Input Current | 0.1–0.5 μA - enables high-impedance feedback networks; reduces power loss in battery-powered applications. |
| Output Voltage Range | VREF to 18 V - achieved via two external resistors; supports wide-range programmability without discrete Zener arrays. |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size) with gull-wing leads; moisture sensitivity level 1, RoHS-compliant, Pb-free terminal finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference input | High-impedance node sensing feedback voltage; requires ≥0.1 μA bias current to maintain regulation. |
| 2 - CATHODE | Shunt current output | Sinks regulated current to ANODE; connects to optocoupler LED anode in isolated SMPS feedback paths. |
| 3 - ANODE | Common return | Typically connected to system ground or negative rail; serves as current sink reference and thermal path. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use with 1.8 V, 2.5 V, and 3.3 V rails where traditional 2.5 V references fail. |
| Sharp turn-on characteristic | High open-loop gain (>80 dB) - delivers fast comparator response with integrated 1.24 V threshold, eliminating external reference. |
| Stable without output capacitor | Internally compensated - removes need for cathode-to-anode bypass cap in most configurations, reducing BOM count. |
| Zener diode replacement | Leakage <0.1 μA at 18 V - improves efficiency in standby modes versus standard Zeners with >10 μA leakage. |
| Pinout flexibility | TLVH432-specific REF–CATHODE–ANODE order - matches layout requirements of optocoupler-coupled feedback circuits. |
Applications
| Secondary-Side Regulation | Voltage Monitoring |
|---|---|
|
Use Scenario: Isolated 3.3 V flyback converter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Error amplifier and precision voltage reference on secondary side. Use Value: Enables regulation down to 2.7 V output (1.24 V reference + 1.4 V opto-LED drop), meeting tight 3.3 V ±3% spec. |
Use Scenario: Real-time monitoring of 5 V and 12 V power rails in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Adjustable threshold detector comparing rail voltage against resistor-divided reference. Use Value: 100 μA minimum cathode current allows direct connection to rail without burdening LDO output; ±1% accuracy ensures reliable fault detection. |
| Comparator with Integrated Reference | Adjustable Voltage Reference |
|
Use Scenario: Overvoltage lockout circuit triggering shutdown when 24 V supply exceeds 27.5 V. IC Role / Device Role / Timing Role: Open-loop comparator with built-in 1.24 V reference and high-gain output stage. Use Value: Eliminates external reference IC and comparator; sharp turn-on ensures clean 50 ns response to overvoltage events. |
Use Scenario: Programmable reference for 12-bit SAR ADC in battery-powered data logger. IC Role / Device Role / Timing Role: Precision adjustable reference source set by R1/R2 network per Figure 6-2. Use Value: 0.25 Ω dynamic impedance maintains <0.5 LSB error across 10 kΩ load variations; 0.5 μA Iref minimizes divider current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432IDBZRG4 | Same pinout and function; ±1.5% VREF tolerance at 25°C (I-grade), –40°C to +85°C operating range. | Lower accuracy and narrower temperature range; suitable for commercial-grade power supplies. | Select when cost sensitivity outweighs precision and extended temperature needs. |
| TLVH431ACDBZR | Same A-grade accuracy but TLVH431 pinout (CATHODE–REF–ANODE); requires PCB layout change. | Compatible in non-isolated applications; not drop-in for optocoupler-coupled designs using TLVH432 pinout. | Choose only if redesigning layout to accommodate cathode-first orientation and verifying stability with new feedback path. |
Compared with TLVH432ACDBZRG4, TLVH432IDBZRG4 trades accuracy and temperature range for lower cost, while TLVH431ACDBZR demands layout revision due to incompatible pin mapping-neither offers pin-compatible replacement without hardware modification.
Availability
TLVH432ACDBZRG4 is available at Aetrix Electronics and suitable for isolated SMPS feedback, voltage monitoring, comparator circuits, and adjustable reference designs requiring stable component supply across automotive, industrial, and telecom applications.
Supply support for TLVH432ACDBZRG4 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 precision analog ICs and power management solutions.
The TLVH43x family was designed specifically for low-voltage shunt regulation and integrated reference applications in space-constrained, thermally demanding systems-targeting isolated power supplies, battery monitors, and programmable instrumentation.
FAQ
What is the reference voltage tolerance of TLVH432ACDBZRG4 at 25°C?
The TLVH432ACDBZRG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal VREF with min/max values of 1.228 V and 1.252 V. This A-grade specification is confirmed in Section 5.6 of the SLVS555N datasheet and applies across all package variants including the DBZ SOT-23-3 form factor used in TLVH432ACDBZRG4.
How does TLVH432ACDBZRG4 differ from TLVH431ACDBZR in pin configuration?
TLVH432ACDBZRG4 uses REF–CATHODE–ANODE pinout (Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE) in its SOT-23-3 package, whereas TLVH431ACDBZR uses CATHODE–REF–ANODE (Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE). This reversal enables TLVH432ACDBZRG4 to interface directly with optocoupler anodes in secondary-side regulation without signal inversion or layout changes.
What is the minimum cathode current required for regulation in TLVH432ACDBZRG4?
The TLVH432ACDBZRG4 requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 (IK(min)) of the datasheet. This value holds across the full operating temperature range (–40°C to +125°C) and is critical for stable operation in low-power feedback paths such as those found in energy-harvesting or battery-backed systems.
Can TLVH432ACDBZRG4 operate without an output capacitor between cathode and anode?
Yes, TLVH432ACDBZRG4 is internally compensated and stable without an output capacitor between cathode and anode under typical conditions. Section 7.3 explicitly states this capability. However, capacitive loads >1 nF may reduce phase margin; Figures 5-15 through 5-17 provide guidance for selecting stabilizing capacitance when needed for specific layout or noise requirements.
What is the dynamic impedance of TLVH432ACDBZRG4 and how does it affect regulation performance?
The TLVH432ACDBZRG4 has a typical dynamic impedance of 0.25 Ω, measured at 1 kHz with cathode current from 0.1 mA to 70 mA. This low value ensures minimal output voltage deviation under load steps-e.g., a 10 mA transient induces only 2.5 mV shift-making it suitable for precision regulation in ADC references and closed-loop SMPS error amplifiers.
TLVH432ACDBZRG4 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:
- ±1%
- 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
TLVH432ACDBZRG4 FAQ
1.How can I place an order for TLVH432ACDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432ACDBZRG4 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 TLVH432ACDBZRG4 reliable?
The price and inventory of TLVH432ACDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432ACDBZRG4 is usually 5 days.
3.What payment methods are accepted for TLVH432ACDBZRG4?
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TLVH432ACDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432ACDBZRG4 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 TLVH432ACDBZRG4?
For technical support, including TLVH432ACDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432ACDBZRG4 requirements.
6.How does Aetrix verify that TLVH432ACDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TLVH432ACDBZRG4 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 TLVH432ACDBZRG4 meets industry standards.
7.What is the process for return or replacement of TLVH432ACDBZRG4?
All TLVH432ACDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432ACDBZRG4, 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 TLVH432ACDBZRG4 part is unused and in its original packaging.
Return procedure for TLVH432ACDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432ACDBZRG4 Tags
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TL431BQDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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