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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

STMicroelectronics LM236Z-AP

Name: LM236Z-AP
Brand: STMicroelectronics
SKU: LM236Z-AP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM236Z-AP

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: LM236Z-AP.pdf

Description:: IC VREF SHUNT 2% TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,041

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Product details

Overview

LM236Z-AP from STMicroelectronics is a precision 2.5V shunt voltage reference IC in TO-92 package, functioning as an adjustable Zener-like regulator with 0.2Ω dynamic impedance, ±5mV initial tolerance at 1mA, and guaranteed temperature stability over –25°C to +85°C. It enables accurate biasing in analog sensor signal conditioning circuits requiring low-drift references.

For engineers reviewing the LM236Z-AP datasheet, LM236Z-AP pinout, LM236Z-AP application, or LM236Z-AP equivalent, key selection criteria include its 400µA–10mA operating current range, 3.5mV max temperature coefficient (–25°C to +85°C), adjustable reference voltage via external potentiometer, and compatibility with precision power regulators and buffered reference designs.

Technical Context

The LM236Z-AP operates as a two-terminal (with third-terminal adjustment) shunt reference, using bandgap-derived Zener topology to achieve stable 2.5V output with minimal thermal drift. Its third pin (ADJ) allows trimming of breakdown voltage without altering temperature coefficient, supporting circuit-level calibration.

It delivers 0.2Ω dynamic impedance at 1mA reverse current and maintains ≤6mV total voltage change across full 400µA–10mA operating range and full temperature span. Long-term stability is rated at 20ppm typical after 1000 hours at 25°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.49V typical at 1mA, 2.44–2.54V min/max - sets precise DC bias point for ADCs and op-amp feedback networks
Dynamic Impedance	0.2Ω typical at 1mA - ensures <1mV output shift per 1mA load variation, critical for high-resolution measurement systems
Operating Current Range	400µA to 10mA - supports ultra-low-power sensor nodes and high-current reference buffering without external gain stages
Temp. Coefficient	3.5mV max over –25°C to +85°C - enables <10ppm/°C effective drift when adjusted to 2.49V, suitable for industrial-grade instrumentation
Long-Term Stability	20ppm typical (1000h @ 25°C) - reduces recalibration frequency in field-deployed test equipment and process controllers
Reverse Voltage Change	≤6mV over full current/temperature range - guarantees consistent reference accuracy across supply variations and ambient shifts

Pinout & Package

LM236Z-AP is supplied in TO-92 plastic package (bulk or ammopack), with bottom-view pinout: Pin 1 = V− (cathode), Pin 2 = ADJ (adjust), Pin 3 = V+ (anode). The ADJ pin enables external resistor/potentiometer connection to fine-tune reference voltage while preserving temperature coefficient integrity.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (V−)	Cathode / Reference Output	Primary 2.5V reference node; connects to load or op-amp inverting input in shunt configuration
Pin 2 (ADJ)	Adjust Terminal	Enables external voltage division to trim VR from ~2.4V to ~2.6V without degrading tempco performance
Pin 3 (V+)	Anode / Current Sink	Current return path; ties to ground or negative rail in standard shunt regulator topology

Key Features

Feature	Design Value
Adjustable Reference Voltage	External potentiometer on ADJ pin enables ±50mV tuning around 2.49V while maintaining low tempco
Low Dynamic Impedance	0.2Ω typical ensures minimal output perturbation under varying load or supply ripple conditions
Wide Operating Current	400µA–10mA range supports both battery-powered sensors and high-accuracy active references
Guaranteed Temp Stability	Specified over –25°C to +85°C with 3.5mV max drift - validated for industrial control environments

Applications

Precision Power Regulator

Wide Input Range Reference

Use Scenario: Stable 2.5V supply for 16-bit SAR ADCs in programmable logic controllers with 12–24V unregulated input rails.

IC Role / Device Role / Timing Role: Shunt reference providing regulated bias for ADC internal reference buffer and external op-amp driver stages.

Use Value: 0.2Ω impedance and 6mV total voltage variation ensure <0.01% reference error across temperature and line changes.

Use Scenario: Reference source for isolated DC-DC converter feedback in telecom power modules with 36–75V input range.

IC Role / Device Role / Timing Role: Primary voltage setpoint generator in optocoupler-coupled secondary-side regulation loop.

Use Value: 400µA minimum operating current enables reliable startup even during light-load brownout conditions.

Adjustable Shunt Regulator

Low-Noise Buffered Reference

Use Scenario: Programmable voltage threshold detector in battery management ICs where trip points must be calibrated per cell chemistry.

IC Role / Device Role / Timing Role: Adjustable shunt element setting comparator reference via ADJ pin and external 10kΩ potentiometer.

Use Value: Trimmed 2.49V operation minimizes temperature coefficient to <5ppm/°C, improving SOC estimation accuracy.

Use Scenario: Low-noise reference for audio DACs in professional mixing consoles requiring <10nV/√Hz noise floor.

IC Role / Device Role / Timing Role: Pre-buffered 2.5V source feeding unity-gain op-amp stage to isolate noise-sensitive analog signal paths.

Use Value: 20ppm long-term stability and sub-10mV peak-to-peak noise support 24-bit audio resolution over product lifetime.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDBVR	2.495V nominal, 0.2Ω impedance, but requires ≥1mA cathode current and lacks dedicated ADJ pin for tempco-preserving tuning	Fixed-reference use only; unsuitable for circuits requiring post-calibration voltage trim	Select when fixed 2.5V output suffices and cost sensitivity outweighs adjustability needs
REF200AIDR	2.048V output, 0.5Ω impedance, integrated current source, no ADJ pin, ±10ppm/°C tempco	Designed for current-source-based references; incompatible with Zener-style shunt topologies	Select only for dual-output current-sink reference designs, not as direct LM236Z-AP replacement

Compared with TL431ACDBVR and REF200AIDR, LM236Z-AP uniquely supports post-manufacturing voltage calibration without sacrificing temperature stability-critical for high-accuracy industrial calibration equipment and sensor front-ends where unit-to-unit tolerance correction is required.

Availability

LM236Z-AP is available at Aetrix Electronics and suitable for precision power regulators, wide-input-range references, adjustable shunt regulators, and low-noise buffered references requiring stable component supply across industrial, test & measurement, and sensor interface applications.

Supply support for LM236Z-AP 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, analog components, and MEMS sensors for industrial, automotive, and consumer markets.

LM236Z-AP belongs to ST's precision voltage reference product line, engineered specifically for applications demanding low tempco, wide current operation, and field-adjustable output-targeting industrial instrumentation, process control, and high-fidelity data acquisition systems.

FAQ

What is the correct pinout orientation for LM236Z-AP in TO-92 package?

The LM236Z-AP TO-92 uses bottom-view pinout: Pin 1 (left) is V− (cathode/reference output), Pin 2 (center) is ADJ (adjust terminal), Pin 3 (right) is V+ (anode/current sink). This matches ST's May 2007 Rev 3 datasheet Figure 1 and Table 3 ordering information.

Can LM236Z-AP be used without connecting the ADJ pin?

Yes - leaving ADJ unconnected configures LM236Z-AP as a fixed 2.5V shunt reference with typical 2.49V output. The ADJ pin is optional; open-circuit operation maintains full specification compliance including 0.2Ω impedance and 3.5mV temperature coefficient.

What is the minimum operating current to guarantee specified voltage accuracy?

The LM236Z-AP guarantees reference voltage accuracy down to 400µA reverse current, as confirmed in Table 2 (Electrical Characteristics) of the ST datasheet. Below this, VR may deviate beyond the ±50mV initial tolerance band, especially at temperature extremes.

How does LM236Z-AP differ from LM336Z-AP?

LM236Z-AP is rated for –25°C to +85°C operation, while LM336Z-AP is limited to 0°C to +70°C. Both share identical electrical specs and pinout, but LM236Z-AP supports broader industrial ambient ranges and has tighter temperature coefficient limits (3.5mV vs. 9mV max over respective ranges).

LM236Z-AP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Series:: -

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 2.49V

Voltage - Output (Max):: -

Current - Output:: 10 mA

Tolerance:: ±2%

Temperature Coefficient:: -

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: -

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 400 µA

Operating Temperature:: -25°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

LM236Z-AP FAQ

1.How can I place an order for LM236Z-AP through Aetrix?

Please submit a Request for Quotation (RFQ) for LM236Z-AP 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 LM236Z-AP reliable?

The price and inventory of LM236Z-AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM236Z-AP is usually 5 days.

3.What payment methods are accepted for LM236Z-AP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM236Z-AP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM236Z-AP?

LM236Z-AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM236Z-AP 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 LM236Z-AP?

For technical support, including LM236Z-AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM236Z-AP requirements.

6.How does Aetrix verify that LM236Z-AP is sourced from the original manufacturer or authorized distributors?

All LM236Z-AP 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 LM236Z-AP meets industry standards.

7.What is the process for return or replacement of LM236Z-AP?

All LM236Z-AP units undergo pre-shipment inspection (PSI). If there is an issue with LM236Z-AP, 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 LM236Z-AP part is unused and in its original packaging.

Return procedure for LM236Z-AP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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