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

STMicroelectronics LM723CD

Name: LM723CD
Brand: STMicroelectronics
SKU: LM723CD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM723CD

Manufacturer:: STMicroelectronics

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

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: LM723CD.pdf

Description:: IC REG LINEAR POS ADJ 150MA 14SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM723CD from STMicroelectronics is a monolithic programmable voltage regulator IC supporting positive or negative supply operation, adjustable output voltage from 2 V to 37 V, internal current limiting up to 150 mA, and series/shunt/switching/floating configurations. It operates with input voltages up to 40 V and features ±150 ppm/°C output voltage drift and 74–86 dB supply voltage rejection.

For engineers reviewing the LM723CD datasheet, LM723CD pinout, LM723CD application, or LM723CD equivalent, key selection criteria include its wide input range (9.5–40 V), precision reference voltage (6.8–7.5 V), adjustable current limiting via external R_SC, thermal resistance (160 °C/W in SO-14), and compatibility with NPN/PNP external pass transistors for >150 mA loads.

Technical Context

The LM723CD integrates a 7.15 V bandgap reference, error amplifier, current-sense comparator, and driver stage - enabling configurable regulation topologies without requiring dedicated controller ICs. Its architecture supports both high-side (NPN) and low-side (PNP) external pass transistor configurations, with remote shutdown and foldback current limiting implemented via dedicated pins.

It delivers stable regulation across industrial temperature range (0°C to +70°C), with line regulation as tight as 0.01% over 3 V input change and load regulation of 0.03% for 1–50 mA load variation. The device's dual-mode current limiting (fixed or foldback) and floating capability allow use in isolated or high-voltage bias supplies beyond standard ground-referenced designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	9.5 V to 40 V DC - supports wide-input industrial and telecom power rails without pre-regulation
Output Voltage Range	2 V to 37 V - adjustable via external resistor divider; enables single IC to cover multiple system rail requirements
Reference Voltage	6.8 V to 7.5 V (typ. 7.15 V) - precision bandgap reference with ±0.35 V tolerance at 25°C
Output Current (Internal)	Up to 150 mA - sufficient for low-power analog circuits or control logic without external pass devices
Current Limit Threshold	65 mA at R_SC = 10 Ω - sets short-circuit protection level; adjustable by changing R_SC
Thermal Resistance (J-A)	160 °C/W (SO-14 package) - defines maximum power dissipation before thermal shutdown under natural convection
Supply Voltage Rejection	74 dB (no C_REF) / 86 dB (5 µF C_REF) - determines ripple attenuation capability in noisy input environments

Pinout & Package

LM723CD is packaged in a 14-pin SOIC (SO-14) surface-mount package with 1.27 mm pitch, 8.55–8.75 mm width, and 5.8–6.2 mm body length per STMicroelectronics mechanical drawing PO13G.

Pin/Terminal	Circuit Role	Design Meaning
1 (V⁻)	Negative Supply Input	Connects to negative rail in dual-supply or negative-output configurations
2 (Current Sense)	Current Limit Input	Senses voltage drop across R_SC to trigger current limiting when ≥0.65 V
3 (Shutdown)	Remote Shutdown Control	Pull below 1.5 V to disable output; used for sequencing or fault isolation
4 (Non-Inverting Input)	Error Amplifier Input (+)	Connects to feedback divider; compares output voltage against internal reference
5 (Inverting Input)	Error Amplifier Input (−)	Connected to V_REF for fixed-output mode or left open for adjustable configuration
6 (Output)	Driver Output	Drives base/gate of external NPN/PNP pass transistor or directly sources ≤150 mA
7 (V⁺)	Positive Supply Input	Main power input; must be ≥3 V above regulated output in standard configurations
8 (V_REF)	Reference Voltage Output	Provides stable 7.15 V reference for feedback network or auxiliary circuitry
9 (Comp)	Frequency Compensation	Connects external capacitor to stabilize loop response and prevent oscillation
10 (Current Limit Adj)	Foldback Adjustment	Configures knee point and short-circuit current in foldback limiting mode
11 (GND)	Analog Ground	Reference node for internal circuitry; separate from power ground in mixed-signal layouts
12 (V_O)	Output Voltage Sense	High-impedance feedback node; connects to output or divider tap for regulation sensing
13 (NC)	No Connect	Internally unused; must remain unconnected per datasheet
14 (V_CC)	Positive Bias Supply	Provides internal bias; tied to V⁺ unless using floating configuration

Key Features

Feature	Design Value
Adjustable Output Voltage	2–37 V via two-resistor divider - eliminates need for multiple fixed-voltage regulators
Configurable Regulation Topology	Supports series, shunt, switching, and floating modes - enables reuse across diverse power architectures
Programmable Current Limiting	Fixed or foldback limiting set by R_SC and pin 10 - protects downstream circuitry during overload or short-circuit events
Remote Shutdown Capability	Active-low shutdown pin (Pin 3) - allows synchronized power-down in multi-rail systems
Wide Operating Temperature Range	0°C to +70°C ambient - validated for industrial-grade reliability without derating

Applications

Industrial Power Supplies

Test Equipment Bias Rails

Use Scenario: Regulated ±15 V and +5 V rails for op-amp-based signal conditioning modules in PLC I/O cards.

IC Role / Device Role / Timing Role: Primary voltage regulator providing stable analog supply with <0.15% load regulation over 1–50 mA.

Use Value: Enables consistent ADC/DAC performance by minimizing supply-induced offset drift and noise coupling.

Use Scenario: Programmable 3–30 V output for calibrating multimeters and sourcing test currents in bench instruments.

IC Role / Device Role / Timing Role: Adjustable linear regulator with remote shutdown for safe output enable/disable during calibration sequences.

Use Value: Eliminates need for discrete op-amp/error amp designs while maintaining <1.5 mV load regulation at 50 mA.

Telecom Line Card Bias

Legacy System Voltage Translation

Use Scenario: +24 V and −24 V bias generation for analog front-end amplifiers in DSL line cards operating from 48 V DC input.

IC Role / Device Role / Timing Role: Floating regulator configured with external PNP pass transistor to deliver 1 A at 24 V with foldback limiting.

Use Value: Achieves <15 mV load regulation at full current while protecting against line faults via programmable current limit.

Use Scenario: Replacement of obsolete 78Lxx/79Lxx regulators in legacy medical monitoring equipment requiring 5 V and −5 V rails.

IC Role / Device Role / Timing Role: Drop-in compatible regulator with identical SO-14 footprint and pin-compatible V_REF/shutdown interface.

Use Value: Maintains existing PCB layout while extending operating range to 40 V input and adding programmable current limiting.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL783CP	Higher max input voltage (125 V), fixed 1.25 V reference, no internal current sense comparator	Requires external current-sense circuitry for limiting; better suited for ultra-high-voltage (>60 V) applications	Select TL783CP only when input exceeds 40 V and external current-limit design is acceptable
LT1083CP	Higher output current (7.5 A), fixed 1.25 V reference, no V_REF output or shutdown pin	Lacks programmable shutdown and reference output; optimized for high-current, low-dropout use cases	Choose LT1083CP when >150 mA continuous output is required and reference sharing is unnecessary

Compared with TL783CP and LT1083CP, the LM723CD uniquely combines an integrated 7.15 V reference, dedicated shutdown and current-sense inputs, and support for both positive/negative/floating topologies - making it optimal for multi-rail, fault-aware, and space-constrained industrial designs where flexibility outweighs raw current capability.

Availability

LM723CD is available at Aetrix Electronics and suitable for industrial power supplies, test equipment bias rails, telecom line card bias, and legacy system voltage translation requiring stable component supply and long-term obsolescence management.

Supply support for LM723CD 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog portfolio coverage.

The LM723 product line was designed as a general-purpose programmable regulator platform for industrial and instrumentation applications where configurability, reliability, and wide input/output range are prioritized over integration density.

FAQ

What is the minimum input-to-output voltage difference required for stable regulation?

The LM723CD requires a minimum dropout voltage of 3 V between input and output for reliable operation, as specified in the VO–VI parameter (3–38 V). This ensures sufficient headroom for internal error amplifier and driver stage biasing. Below this margin, regulation degrades rapidly, and output may collapse under load - especially at high junction temperatures or near current limit thresholds.

Can the LM723CD regulate negative output voltages?

Yes - the LM723CD supports negative output configurations using its dual-supply architecture. Pin 1 (V⁻) connects to the most negative rail, and the feedback network references ground. Figure 15 in the datasheet shows a working −15 V design with 1 mV line regulation and 2 mV load regulation at 100 mA, confirming validated negative regulation capability.

How does the foldback current limiting differ from fixed current limiting?

Foldback limiting reduces output current as output voltage drops during a short circuit - e.g., from 65 mA at nominal output to ~20 mA at 0 V - minimizing power dissipation in the pass transistor. Fixed limiting holds current constant at 65 mA regardless of output voltage, risking thermal failure. Foldback is enabled by connecting Pin 10 to appropriate resistor networks per Figure 18.

Is the V_REF pin (Pin 8) internally buffered?

Yes - Pin 8 provides a buffered 7.15 V reference with ±0.35 V tolerance and can source up to 25 mA (LM723C spec). It is electrically isolated from the main regulator loop and may power external comparators or ADC references without affecting regulation accuracy, provided load current remains within datasheet limits.

LM723CD Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

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):: 4 mA

Current - Supply (Max):: -

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

Control Features:: -

Protection Features:: Over Current

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SO

LM723CD FAQ

1.How can I place an order for LM723CD through Aetrix?

Please submit a Request for Quotation (RFQ) for LM723CD 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 LM723CD reliable?

The price and inventory of LM723CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM723CD is usually 5 days.

3.What payment methods are accepted for LM723CD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM723CD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM723CD?

LM723CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM723CD 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 LM723CD?

For technical support, including LM723CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM723CD requirements.

6.How does Aetrix verify that LM723CD is sourced from the original manufacturer or authorized distributors?

All LM723CD 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 LM723CD meets industry standards.

7.What is the process for return or replacement of LM723CD?

All LM723CD units undergo pre-shipment inspection (PSI). If there is an issue with LM723CD, 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 LM723CD part is unused and in its original packaging.

Return procedure for LM723CD:

1.Submit a request within 90 days.

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

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