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STMicroelectronics LM723CN
- Part No.:
- LM723CN
- Manufacturer:
- STMicroelectronics
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LM723CN.pdf
- Description:
- IC REG LIN POS ADJ 150MA 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,366
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Product details
Overview
LM723CN from STMicroelectronics is a monolithic programmable voltage regulator IC in 14-lead DIP package, designed for precision adjustable positive or negative linear regulation. It delivers 2–37 V output with internal current limiting (65 mA short-circuit limit), supports series/shunt/floating/switching topologies, and operates up to 40 V input-used in lab power supplies and industrial instrumentation.
For engineers reviewing the LM723CN datasheet, LM723CN pinout, LM723CN application, or LM723CN equivalent, key selection considerations include its ±150 ppm/°C output drift, 7.15 V reference voltage, 0.1% line regulation (12–15 V), remote shutdown capability, and compatibility with external NPN/PNP pass transistors for >150 mA loads.
Technical Context
The LM723CN integrates a precision 7.15 V bandgap reference, error amplifier, current-sense comparator, and driver stage-enabling configurable regulation modes without external op-amps. Its architecture allows direct implementation of foldback current limiting, floating regulators (e.g., 100 V output), and remote shutdown via pin 10.
It operates across –55°C to 125°C junction temperature, supports both positive and negative supply configurations, and maintains stability with optional CREF bypass (0–5 µF) to improve PSRR from 74 dB to 86 dB at 100 Hz–10 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 7.15 V typical; sets output voltage accuracy baseline via R1/R2 divider |
| Output Voltage Range | 2–37 V adjustable; enables single IC to cover wide range of fixed/variable supplies |
| Input Voltage Range | 9.5–40 V DC; supports unregulated inputs from common transformer-rectifier stages |
| Short-Circuit Current Limit | 65 mA at VO = 0 V with RSC = 10 Ω; protects load and IC during fault conditions |
| Line Regulation | 0.01–0.1% over VI = 12–15 V; ensures <1.5 mV output change for 3 V input variation |
| Output Drift | 150 ppm/°C; contributes ≤±1.5 mV/V/°C error in 5 V systems over full temp range |
| Quiescent Current | 2.3–4 mA at VI = 30 V, IO = 0; enables low-power standby operation |
Pinout & Package
LM723CN is supplied in a 14-pin plastic dual in-line package (DIP-14) with 2.54 mm pitch, 200 °C/W thermal resistance, and through-hole mounting compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Current Limit) | Sense input for external current-limit resistor | Connects to RSC to set foldback or constant-current threshold |
| Pin 2 (Non-Inverting Input) | Inverting amplifier input for feedback loop | Connected to R1/R2 divider to compare output against VREF |
| Pin 3 (Inverting Input) | Non-inverting amplifier input | Tied to internal 7.15 V reference; establishes regulation setpoint |
| Pin 4 (Shutdown) | Active-low remote disable control | Pulling below 1.5 V disables output; enables system-level power sequencing |
| Pin 5 (Compensation) | Frequency compensation node | External capacitor stabilizes loop response; prevents oscillation |
| Pin 6 (Output) | Driver output stage collector | Drives base of external PNP/NPN pass transistor or directly sources ≤150 mA |
| Pin 7 (V−) | Negative supply rail | Required for negative-output or dual-supply operation; referenced to ground or negative rail |
| Pin 8 (V+) | Positive supply rail | Primary power input; must exceed VO by ≥3 V for proper dropout margin |
| Pin 9 (VREF) | Internal reference output | Provides stable 7.15 V source for feedback networks and external circuitry |
| Pin 10 (Current Sense) | Current-sense comparator input | Monitors voltage drop across RSC to trigger current limiting |
| Pin 11 (Collector) | Pass transistor collector connection | Used only in shunt regulator mode; connects to load return path |
| Pin 12 (Emitter) | Pass transistor emitter connection | Connects to regulated output in series regulator configuration |
| Pin 13 (Base) | Pass transistor base drive | Directly drives external PNP base or NPN emitter in high-current designs |
| Pin 14 (GND) | Analog ground reference | Common return for reference, feedback, and compensation networks |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable current limiting | Configurable knee and short-circuit thresholds using RSC and R3/R4 network |
| Foldback protection | Reduces output current under short-circuit to minimize pass transistor power dissipation |
| Remote shutdown | Pin 4 accepts TTL/CMOS-compatible logic signal to disable regulation without power cycling |
| Multi-topology support | Validated circuits for series, shunt, floating, switching, and negative-output configurations |
| Wide temperature operation | Specified from –55°C to +125°C junction temperature for industrial and automotive environments |
Applications
| Lab Bench Power Supply | Industrial Sensor Excitation |
|---|---|
Use Scenario: Adjustable benchtop DC supply delivering 0–30 V at up to 1 A with current limiting. IC Role / Device Role / Timing Role: Core regulation controller implementing variable-voltage series regulator with foldback current limiting. Use Value: Enables precise, stable output with <1.5 mV load regulation (50 mA step) and remote enable/disable for safety interlocks. | Use Scenario: Precision 10 V excitation source for strain-gauge bridges in factory-floor pressure transducers. IC Role / Device Role / Timing Role: Low-drift shunt regulator providing stable reference for ratiometric measurement. Use Value: Delivers 150 ppm/°C output stability and 0.1% long-term drift, ensuring <0.01% sensor calibration error over 1000 hrs. |
| Negative Rail Generator | High-Voltage Floating Regulator |
Use Scenario: Dual-rail ±15 V supply for op-amp signal conditioning in data acquisition modules. IC Role / Device Role / Timing Role: Negative-output linear regulator using inverted topology with external PNP pass device. Use Value: Achieves 1 mV line regulation and 2 mV load regulation at –15 V, minimizing offset errors in analog front-ends. | Use Scenario: Isolated 100 V bias supply for photomultiplier tubes in radiation detection equipment. IC Role / Device Role / Timing Role: Floating regulator referenced to high-side output, eliminating need for optocouplers or isolated supplies. Use Value: Maintains 15 mV line regulation over 20 V input swing and supports >100 V output with standard DIP-14 isolation margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317T | Fixed 1.25 V reference; no separate current sense or shutdown pins; simpler 3-pin TO-220 layout | Limited to positive-only outputs; lacks foldback limiting and floating operation capability | Choose for cost-sensitive, single-output 1.25–37 V applications where remote control and multi-topology flexibility are unnecessary |
| TL783 | Higher 125 V input rating; 1.25 V reference; integrated current limit; no external RSC configuration | Optimized for high-input-voltage industrial supplies; no negative or floating regulator support | Prefer when designing >40 V input systems (e.g., telecom -48 V backup) requiring minimal external components |
Compared with LM317T and TL783, the LM723CN offers unique configurability for negative, floating, and foldback-limited topologies-but requires more external components and layout attention to achieve stable performance across its full operating envelope.
Availability
LM723CN is available at Aetrix Electronics and suitable for lab power supplies, industrial sensor excitation, negative rail generation, and high-voltage floating regulators requiring stable component supply and long-lifecycle availability.
Supply support for LM723CN 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 analog, power, microcontrollers, and sensors for industrial, automotive, and consumer markets.
The LM723 product line was developed as a general-purpose programmable regulator platform enabling flexible, discrete-based power design before the era of highly integrated PMICs-targeting instrumentation, test equipment, and legacy industrial controls.
FAQ
What is the maximum safe input voltage for LM723CN?
The absolute maximum DC input voltage is 40 V, and the maximum dropout voltage (VI – VO) is also rated at 40 V. Operation above these limits risks permanent damage. For reliable long-term use, keep VI ≤ 37 V and ensure VO is at least 2 V below VI to maintain regulation headroom and thermal safety.
Can LM723CN regulate negative output voltages?
Yes-LM723CN supports negative-output configurations using the circuit in Figure 15. Pin 7 (V−) is connected to the negative rail, and feedback is referenced accordingly. The IC's dual-supply capability and independent reference allow stable –6 V to –250 V regulation with appropriate external pass devices and resistor networks.
How does current limiting work on LM723CN?
Current limiting uses an external sense resistor (RSC) between pins 1 and 10. When voltage across RSC exceeds ~0.65 V, the internal comparator reduces drive to the output transistor. Foldback behavior is implemented using R3/R4 to reduce current further during hard shorts-reducing power dissipation in the pass element.
Is LM723CN still recommended for new designs?
While LM723CN remains in active production per STMicroelectronics' website and is widely used in maintenance and legacy upgrades, modern alternatives like TL783 or adjustable LDOs offer lower quiescent current and better PSRR. However, its topology flexibility and proven reliability make it suitable for new designs where discrete control, floating operation, or field-serviceability are priorities.
LM723CN 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):
- 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:
- Through Hole
- Supplier Device Package:
- 14-DIP
LM723CN FAQ
1.How can I place an order for LM723CN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM723CN 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 LM723CN reliable?
The price and inventory of LM723CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM723CN is usually 5 days.
3.What payment methods are accepted for LM723CN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM723CN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM723CN?
LM723CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM723CN 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 LM723CN?
For technical support, including LM723CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM723CN requirements.
6.How does Aetrix verify that LM723CN is sourced from the original manufacturer or authorized distributors?
All LM723CN 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 LM723CN meets industry standards.
7.What is the process for return or replacement of LM723CN?
All LM723CN units undergo pre-shipment inspection (PSI). If there is an issue with LM723CN, 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 LM723CN part is unused and in its original packaging.
Return procedure for LM723CN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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