Texas Instruments TL430CLPR

Overview

TL430CLPR from Texas Instruments is a 3-terminal adjustable shunt voltage regulator with programmable output (3 V to 30 V), 2.5 V reference input voltage, ±0.5% initial accuracy at 25°C, 1.5 Ω typical differential resistance, and 100 mA sink capability. It replaces discrete Zener diodes in precision feedback loops for linear regulators and power supply monitoring circuits.

For engineers reviewing the TL430CLPR datasheet, TL430CLPR pinout, TL430CLPR application, or TL430CLPR equivalent, this page delivers verified electrical parameters, TO-92 package layout, thermal limits, noise performance (200 µV RMS, 0.1–10 Hz), and design-critical alternatives for voltage reference and shunt regulation use cases.

Technical Context

The TL430CLPR operates as a precision shunt regulator with an internal 2.5 V bandgap reference and high-gain error amplifier. Its output voltage is set externally via two resistors forming a voltage divider between cathode and reference terminals, enabling stable regulation across 3 V–30 V with <120 ppm/°C temperature coefficient.

It functions in continuous conduction mode with 2 mA minimum cathode current (IZK) and supports up to 100 mA sink current (IZ) while maintaining low dynamic impedance (rz ≤ 3 Ω). Thermal design must respect θJA = 140°C/W and TJ(max) = 150°C under ambient conditions from 0°C to 70°C.

Key Specifications

Pinout & Package

TL430CLPR uses the TO-92 (LP) plastic package - 3-pin, straight or formed leads, 5.34 mm max height, JEDEC TO-226 compliant. Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Reference (REF).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt regulator applications.

Compared with TL430CLPR, TL431ACLP extends thermal reliability without altering PCB layout or schematic, while LM431ACM trades regulation precision and noise performance for lower unit cost in non-critical power monitoring roles.

Availability

TL430CLPR is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage protection circuits, linear regulator output control, and VCC monitoring applications requiring stable component supply and long-term manufacturability.

Supply support for TL430CLPR 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 specializing in analog, embedded processing, and power management technologies, with over 50 years of innovation in precision analog ICs.

The TL430 product line was designed specifically for high-stability, low-noise shunt regulation in commercial power management systems - emphasizing programmability, thermal robustness, and ease of integration into feedback networks.

FAQ

What is the reference input voltage tolerance of the TL430CLPR at 25°C?

The TL430CLPR has a reference input voltage (VI(ref)) of 2.5 V with a tolerance of ±0.5% at 25°C, meaning the actual value falls between 2.4875 V and 2.5125 V. This tight tolerance directly determines output voltage accuracy when used with external resistors. The TL430CLPR maintains this specification across its full operating temperature range of 0°C to 70°C, supporting repeatable performance in commercial-grade designs.

Can the TL430CLPR replace a standard Zener diode in a voltage reference circuit?

Yes, the TL430CLPR can directly replace Zener diodes in most voltage reference and shunt regulation applications. Unlike passive Zeners, the TL430CLPR provides superior temperature stability (120 ppm/°C), lower dynamic impedance (1.5 Ω), and programmable output from 3 V to 30 V using two resistors. Its 2.5 V internal reference and 100 mA sink capability make it especially effective in feedback loops where Zener drift or poor regulation would degrade system accuracy.

What is the minimum cathode current required for regulation in the TL430CLPR?

The TL430CLPR requires a minimum cathode current (IZK) of 0.5 mA to maintain regulation near the lower knee of its operating range, with a typical value of 2 mA. Below this threshold, the device exits regulation and output voltage becomes unstable. Designers must ensure that the external resistor network and load conditions guarantee at least 2 mA cathode current under worst-case conditions - including minimum input voltage and maximum output voltage settings - to preserve TL430CLPR functionality.

How does the TL430CLPR handle thermal dissipation in TO-92 packaging?

The TL430CLPR in TO-92 (LP) packaging has a thermal impedance (θJA) of 140°C/W. At 25°C ambient, its maximum allowable power dissipation is 150 mW ((150°C − 25°C)/140°C/W). To avoid exceeding junction temperature limits, designers must calculate worst-case power (VZ × IZ) and verify it remains within this limit - especially at elevated ambient temperatures. PCB copper area and airflow significantly impact real-world thermal performance beyond the datasheet's still-air rating.

Is the TL430CLPR pin-compatible with other members of the TL43x family?

Yes, the TL430CLPR is pin-compatible with all TL43x variants in TO-92 packaging, including TL431CLP and TL432CLP. All share identical Anode–Cathode–Reference pin assignments and mechanical footprint. However, functional differences exist: TL431 offers tighter reference tolerance (±0.5% same) and extended temperature range, while TL432 features a 2.495 V reference. System-level compatibility requires verifying reference voltage, accuracy, and temperature rating requirements before substitution.