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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics LM723N

Name: LM723N
Brand: STMicroelectronics
SKU: LM723N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM723N

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 14-DIP (0.300", 7.62mm)

Datasheet:: LM723N.pdf

Description:: IC REG LIN POS ADJ 150MA 14DIP

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Product details

Overview

LM723N from STMicroelectronics is a monolithic programmable voltage regulator IC supporting positive or negative supply operation in series, shunt, switching, or floating configurations. It delivers adjustable output voltage from 2 V to 37 V with internal current limiting up to 150 mA, and operates with input voltage up to 40 V. It is commonly used in lab power supplies and precision analog instrumentation requiring stable, user-configurable regulation.

For engineers reviewing the LM723N datasheet, LM723N pinout, LM723N application, or LM723N equivalent, key selection considerations include its 7.15 V internal reference voltage, ±150 ppm/°C output drift, 0.02% line regulation (VI = 12–40 V), adjustable current limiting via external RSC, and compatibility with NPN/PNP external pass transistors for higher current.

Technical Context

The LM723N integrates a precision 7.15 V bandgap reference, error amplifier, current-sense comparator, and driver stage in a single DIP-14 package. Its architecture supports both high-side and low-side current sensing through the V− and V+ pins, enabling flexible configuration as series, shunt, or floating regulator.

It implements foldback current limiting using external resistors (R3/R4) and an external sense resistor (RSC), with knee current and short-circuit current independently configurable. Remote shutdown is supported via the SHUTDOWN pin (Pin 10), which disables the output driver when pulled below 0.7 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	7.15 V typical; sets base accuracy for all output voltage calculations via external resistor dividers.
Output Voltage Range	2 V to 37 V adjustable; supports both positive and negative outputs using appropriate topology.
Input Voltage Range	9.5 V to 40 V DC; enables use with unregulated wall adapters or rectified AC rails.
Max Output Current	150 mA without external pass transistor; scalable to >1 A with external NPN/PNP devices.
Line Regulation	0.02% over VI = 12–40 V; ensures <0.7 mV change per volt input variation at 15 V output.
Output Drift	150 ppm/°C; contributes ~2.25 mV drift over 15°C ambient shift at 15 V output.
Noise (CREF = 5 µF)	2.5 µV RMS (100 Hz–10 kHz); critical for low-noise analog supply design.

Pinout & Package

LM723N is housed in a 14-pin plastic dual in-line package (DIP-14) with 2.54 mm lead pitch and standard through-hole mounting. Thermal resistance junction-to-ambient is 200 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (V−)	Negative reference input	Connects to output or ground depending on configuration; used for current sensing in shunt/floating modes.
Pin 2 (Current Sense)	Sense input for current limiting	Accepts voltage drop across external RSC to trigger foldback or constant-current limit.
Pin 3 (V+)	Positive reference input	Connects to regulated output or reference node; defines feedback point for error amplifier.
Pin 4 (Non-inv Input)	Inverting input of error amplifier	Receives scaled output voltage via R1/R2 divider; compared against internal 7.15 V reference.
Pin 5 (Inv Input)	Non-inverting input of error amplifier	Connected to internal 7.15 V reference; establishes regulation setpoint.
Pin 6 (Shutdown)	Active-low enable control	Pull below 0.7 V to disable output driver; allows remote power sequencing or fault shutdown.
Pin 7 (Comp)	Compensation node	External capacitor connects here to stabilize loop response; critical for transient performance.
Pin 8 (VCC)	Positive supply input	Accepts unregulated input up to 40 V; powers internal circuitry and driver stage.
Pin 9 (VREF)	Reference voltage output	Provides stable 7.15 V source for external biasing or auxiliary circuits.
Pin 10 (NC)	No connect	Not internally bonded; left unconnected per datasheet.
Pin 11 (Output)	Main driver output	Drives base/gate of external pass transistor or directly sources load up to 150 mA.
Pin 12 (GND)	Analog ground reference	Return path for reference, error amp, and sense circuitry; separate from power ground in sensitive designs.
Pin 13 (NC)	No connect	Not internally bonded; left unconnected.
Pin 14 (VCC−)	Negative supply input	Required only for negative-output or dual-supply operation; accepts −40 V minimum.

Key Features

Feature	Design Value
Programmable output voltage	Configured via external R1/R2 divider; supports fixed or adjustable outputs from 2 V to 37 V (positive) or −6 V to −250 V (negative).
Foldback current limiting	Reduces output current near short-circuit conditions using R3/R4 network; improves thermal safety during faults.
Remote shutdown capability	Pin 6 accepts TTL/CMOS-compatible logic signal to disable regulator without removing input power.
Internal 7.15 V reference	Stable bandgap reference with 150 ppm/°C drift; eliminates need for external reference in most designs.
Multi-topology support	Validated for series, shunt, switching, and floating configurations per Figures 13–23 in datasheet.

Applications

Lab Bench Power Supply

Industrial Sensor Signal Conditioning

Use Scenario: Adjustable benchtop DC supply delivering 0–30 V at up to 1 A using external PNP pass transistor.

IC Role / Device Role / Timing Role: Core voltage regulation controller implementing error amplification, current limiting, and remote shutdown.

Use Value: Enables precise, stable output with <1.5 mV load regulation (IO = 1 A) and foldback protection during accidental shorts.

Use Scenario: Low-drift ±15 V dual supply for op-amp-based strain gauge amplifiers in factory-floor sensors.

IC Role / Device Role / Timing Role: Dual-rail regulator providing symmetric, temperature-stable analog power with matched drift characteristics.

Use Value: Delivers ±15 V with ≤1 mV line regulation and 150 ppm/°C output drift-critical for sub-mV-level measurement accuracy.

Telecom Line Card Bias Supply

Legacy Test Equipment Voltage Reference

Use Scenario: +48 V to +5 V/−5 V isolated bias rail for line interface ICs in telecom central office equipment.

IC Role / Device Role / Timing Role: Floating regulator configured per Figure 19 to generate isolated secondary rails from primary 48 V bus.

Use Value: Supports 100 V floating operation with 15 mV line regulation over 20 V input swing-ensuring clean bias under varying load conditions.

Use Scenario: Stable 7.15 V reference source for calibration circuits in vintage multimeters and oscilloscopes.

IC Role / Device Role / Timing Role: Precision reference generator using Pin 9 (VREF) output with external buffering and filtering.

Use Value: Provides 7.15 V ±0.2 V over −55°C to +125°C with 0.1%/1000 hrs long-term stability-meeting metrology-grade requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM317LZ	Fixed 1.25 V reference; no external current sense or shutdown pin; max 100 mA output.	Limited to positive-adjustable only; no negative or floating operation; no foldback limiting.	Choose for simpler, lower-cost single-rail supplies where 1.25 V reference suffices and current <100 mA.
TL783CP	Higher input voltage rating (125 V); fixed 1.25 V reference; no internal current sense comparator.	Supports >100 V inputs but lacks programmable current limiting and remote shutdown functionality.	Prefer for ultra-high-input-voltage applications (e.g., vacuum tube heaters) where foldback and shutdown are not required.

Compared with LM317LZ and TL783CP, the LM723N uniquely combines a precision 7.15 V reference, full current-sense architecture, remote shutdown, and multi-topology flexibility-making it the only option among the three capable of negative, floating, and foldback-limited designs.

Availability

LM723N is available at Aetrix Electronics and suitable for lab power supplies, industrial sensor signal conditioning, telecom line card bias supplies, and legacy test equipment requiring stable component supply and long-lifecycle support.

Supply support for LM723N 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LM723 product line was developed as a general-purpose programmable regulator platform for analog power system design-emphasizing configurability, reliability, and wide operating range over integrated simplicity.

FAQ

What is the maximum safe input voltage for LM723N?

The absolute maximum DC input voltage (VI) for LM723N is 40 V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term use, keep VI ≤ 36 V with adequate derating margin, especially at elevated ambient temperatures where junction temperature must remain ≤150°C.

Can LM723N be used for negative voltage regulation?

Yes-LM723N supports negative output configurations, as shown in Figure 15 (negative voltage regulator) and Figure 20 (negative floating regulator). It requires connection of Pin 14 (VCC−) to a negative supply rail (≥−40 V), with Pin 1 (V−) tied to the negative output. The internal reference remains referenced to ground, enabling accurate regulation of negative outputs down to −250 V in floating mode.

How does the foldback current limiting work on LM723N?

Foldback limiting uses external resistors R3 and R4 (plus RSC) to reduce output current as output voltage drops toward zero. When VO decreases, the voltage across R4 rises, reducing the effective current-sense threshold. This causes the knee current (IKNEE) and short-circuit current (ISHORTCKT) to scale inversely with output voltage-lowering power dissipation during sustained shorts and improving thermal safety.

Is LM723N RoHS-compliant and lead-free?

Yes-LM723N is manufactured by STMicroelectronics in RoHS-compliant, lead-free packaging per EU Directive 2011/65/EU. The DIP-14 package uses matte tin plating on leads, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 for through-hole assembly. Full compliance documentation is available in ST's official product change notices (PCNs) for order code LM723N.

LM723N Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 14-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Adjustable

Number of Regulators:: 1

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 2V

Voltage - Output (Max):: 37V

Voltage Dropout (Max):: -

Current - Output:: 150mA

Current - Quiescent (Iq):: 5 mA

Current - Supply (Max):: -

PSRR:: 86db ~ 74dB (100Hz ~ 10kHz)

Control Features:: -

Protection Features:: Over Current

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-DIP

LM723N FAQ

1.How can I place an order for LM723N through Aetrix?

Please submit a Request for Quotation (RFQ) for LM723N 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 LM723N reliable?

The price and inventory of LM723N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM723N is usually 5 days.

3.What payment methods are accepted for LM723N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM723N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM723N?

LM723N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM723N 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 LM723N?

For technical support, including LM723N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM723N requirements.

6.How does Aetrix verify that LM723N is sourced from the original manufacturer or authorized distributors?

All LM723N 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 LM723N meets industry standards.

7.What is the process for return or replacement of LM723N?

All LM723N units undergo pre-shipment inspection (PSI). If there is an issue with LM723N, 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 LM723N part is unused and in its original packaging.

Return procedure for LM723N:

1.Submit a request within 90 days.

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

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