Texas Instruments LM236H-2.5/NOPB

Overview

LM236H-2.5/NOPB from Texas Instruments is a precision 2.5V shunt voltage reference diode designed for stable low-voltage referencing in analog and mixed-signal circuits. It delivers ±1% initial tolerance, 0.2Ω dynamic impedance, and operates across −25°C to +85°C with 400 μA to 10 mA supply current range-enabling use in 5V-supplied instrumentation and op-amp biasing.

For engineers reviewing the LM236H-2.5/NOPB datasheet, LM236H-2.5/NOPB pinout, LM236H-2.5/NOPB application, or LM236H-2.5/NOPB equivalent, key selection criteria include temperature stability (±9 mV over −25°C to +85°C), trimmable reference voltage, low dynamic impedance for noise-sensitive references, and TO-92 metal-can package compatibility with legacy industrial layouts.

Technical Context

The LM236H-2.5/NOPB functions as a two-terminal shunt regulator with a third terminal enabling external trimming of both reference voltage and temperature coefficient. Its monolithic IC structure integrates a low-temperature-coefficient zener-like core with on-chip compensation, eliminating need for external thermal matching in basic configurations.

Unlike series references, it regulates by sinking excess current through its cathode–anode path, requiring only an external series resistor for operation. The trim pin allows adjustment of breakdown voltage without altering temperature drift characteristics-enabling optimization for either accuracy or stability depending on system requirements.

Key Specifications

Pinout & Package

LM236H-2.5/NOPB uses a 3-pin TO-metal-can (NDV) package with center-anode, left-cathode, right-trim configuration (bottom view). The metal can serves as mechanical shield and thermal path, supporting robust operation in noisy industrial environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDR and LM336Z-2.5/NOPB, the LM236H-2.5/NOPB uniquely balances industrial temperature range, trimmable stability, and metal-can EMI resilience-making it optimal for embedded measurement systems needing long-term drift control without redesign.

Availability

LM236H-2.5/NOPB is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and analog front-end calibration requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LM236H-2.5/NOPB 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 90 years of innovation in precision analog components.

The LM236 series belongs to TI's precision voltage reference product line, engineered specifically for industrial and test equipment demanding stable, trimmable, and temperature-resilient shunt references in harsh operating environments.

FAQ

What is the maximum operating temperature for LM236H-2.5/NOPB?

The LM236H-2.5/NOPB is rated for operation from −25°C to +85°C ambient temperature, with a maximum junction temperature of 125°C. This makes it suitable for industrial control cabinets and automotive under-hood applications where ambient temperatures exceed commercial-grade limits. Thermal resistance (θ_JA) is 440°C/W in the TO-metal-can package, so proper heatsinking or airflow should be considered at upper current limits.

Can LM236H-2.5/NOPB be used as a negative voltage reference?

Yes, the LM236H-2.5/NOPB can be configured as a negative voltage reference by reversing its polarity-connecting the cathode to system ground and the anode to a negative rail. In this mode, it regulates −2.5V relative to ground, maintaining the same 0.2Ω dynamic impedance and ±9 mV temperature stability. The trim pin remains functional for adjusting the magnitude of the negative reference.

How do I adjust the reference voltage of LM236H-2.5/NOPB?

To adjust the reference voltage of LM236H-2.5/NOPB, connect a 10 kΩ potentiometer between the cathode (Pin 1) and trim (Pin 3), with the wiper tied to anode (Pin 2). Adjusting the pot changes the effective zener voltage without affecting temperature coefficient-typical trim range is ±70 mV around 2.490 V. For minimum drift, adjust to exactly 2.490 V using a calibrated DMM at 25°C before final soldering.

Is LM236H-2.5/NOPB RoHS compliant?

Yes, LM236H-2.5/NOPB is RoHS compliant (lead-free), as confirmed by Texas Instruments' packaging documentation. The "/NOPB" suffix explicitly denotes lead-free finish, and the device meets JEDEC J-STD-609 Category 1 requirements. It is compatible with standard Pb-free reflow profiles, including peak temperatures up to 260°C for 10 seconds in the TO-metal-can package.

What is the purpose of the trim pin on LM236H-2.5/NOPB?

The trim pin (Pin 3) on LM236H-2.5/NOPB provides independent control over both reference voltage and temperature coefficient. By connecting an external potentiometer, users can adjust the breakdown voltage ±70 mV while simultaneously minimizing temperature-induced drift-achieving <10 ppm/°C stability. This dual-adjustment capability is unique to the LM136/LM236 family and eliminates the need for matched diode networks in high-stability designs.