Texas Instruments LM336-2.5 MDC

Overview

LM336-2.5 MDC from Texas Instruments is a precision 2.5-V shunt voltage reference diode optimized for low-temperature-coefficient operation, 0.27-Ω dynamic impedance, ±1% initial tolerance at 25°C, and stable performance across 0°C to 70°C. It functions as a programmable Zener with adjustable temperature coefficient via the ADJ pin and is used in digital voltmeters, precision power supply feedback loops, and op-amp reference circuits requiring stable low-voltage bias.

For engineers reviewing the LM336-2.5 MDC datasheet, LM336-2.5 MDC pinout, LM336-2.5 MDC application, or LM336-2.5 MDC equivalent, key selection criteria include its 400 µA–10 mA operating current range, 3.5 mV max temperature drift over full range, 2.6 mV max current-induced voltage change at 25°C, trimmable reference voltage, and SOIC-8 package compatibility with standard reflow profiles.

Technical Context

The LM336-2.5 MDC implements an integrated bandgap-derived shunt regulator architecture with internal trimming capability on the ADJ terminal, enabling precise adjustment of both output voltage and temperature coefficient. Its circuit includes a high-gain error amplifier driving a series pass element, with external resistor networks allowing calibration of V_Z and dV_Z/dT.

It operates exclusively in shunt mode-requiring an external current-setting resistor-and supports bidirectional polarity use (positive or negative reference). Unlike series regulators, it does not regulate input-to-output dropout; instead, it maintains 2.5 V across its cathode-anode terminals when biased within its specified current window.

Key Specifications

Pinout & Package

DIESALE (Y) package: Unpackaged silicon die with no leads, bond pads only; requires custom mounting, wire bonding, or flip-chip integration. Not compatible with standard PCB footprints or automated placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDR and REF200AIDR, the LM336-2.5 MDC uniquely supports direct temperature coefficient trimming via ADJ, offers lower dynamic impedance (0.27 Ω), and targets cost-sensitive industrial designs where die-level integration reduces footprint-though it lacks automotive qualification and has narrower temperature range.

Availability

LM336-2.5 MDC is available at Aetrix Electronics and suitable for precision instrumentation, industrial power supplies, and sensor interface circuits requiring stable component supply with traceable lot history and long-term continuity planning.

Supply support for LM336-2.5 MDC 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 industrial-grade components.

The LM336 family was designed for high-stability, low-drift voltage referencing in measurement and control systems-emphasizing manufacturability, ease of trimming, and robustness in unregulated supply environments.

FAQ

What is the operating temperature range for the LM336-2.5 MDC?

The LM336-2.5 MDC is characterized for operation from 0°C to 70°C. This range applies specifically to the LM336-2.5 variant; note that the LM236-2.5 extends to −25°C, and the LM336B-2.5 shares the same 0°C–70°C rating. The LM336-2.5 MDC die form inherits this specification and must be thermally managed within these limits during system operation.

Can the LM336-2.5 MDC be used as a negative voltage reference?

Yes, the LM336-2.5 MDC can be configured as a negative voltage reference by reversing its polarity: connect the ANODE to the system's most positive potential and the CATHODE to the negative reference node. In this configuration, it regulates −2.5 V relative to ANODE, maintaining the same 2.5-V differential. This bidirectional capability eliminates need for separate positive/negative reference parts in dual-supply designs.

How is the ADJ pin used to trim temperature coefficient in the LM336-2.5 MDC?

The ADJ pin on the LM336-2.5 MDC connects to an external resistor divider between CATHODE and ANODE. Adjusting this network changes the internal error amplifier's setpoint and bias current distribution, directly altering both output voltage and its temperature coefficient. Per TI application notes, a 10-kΩ potentiometer between CATHODE and ADJ-with ADJ-to-ANODE tied to a fixed resistor-enables fine-tuning to <1.8 mV total drift over 0°C–70°C.

What is the maximum power dissipation limit for the LM336-2.5 MDC in a typical PCB layout?

The LM336-2.5 MDC, supplied as a DIESALE (Y) bare die, has no defined θ_JA; its thermal performance depends entirely on the host substrate and heatsinking. As a guideline, TI specifies a maximum junction temperature of 150°C. Assuming a worst-case ambient of 70°C and conservative board-conducted thermal resistance of 100°C/W, safe continuous power dissipation is limited to ≤0.8 W (i.e., (150 − 70)/100). Actual derating must be validated with thermal simulation or IR imaging.

Does the LM336-2.5 MDC require an external capacitor for stability?

No, the LM336-2.5 MDC does not require an external capacitor for basic DC stability. Its internal compensation ensures unconditional stability under all specified operating conditions. However, a 10-nF ceramic capacitor placed directly across CATHODE–ANODE is recommended in noisy environments to suppress high-frequency ripple (<100 kHz) and improve PSRR-particularly when used near switching regulators or digital ICs sharing the same ground plane.