BETASupply9.5–40 V
Adjustable precision regulator
LM723 Specifications
Review LM723 electrical specifications, operating conditions and package details.
Package view
Key specifications
Set the output voltage and current limit with external resistors.
Output range2–37 V · circuit dependent
Commercial ambient0–70 °C
Reference7.15 V typical
Package details
LM723CN · PDIP-14
| Property | Details |
|---|---|
| Manufacturer | STMicroelectronics |
| Part number | LM723CN |
| Package | PDIP-14 |
| Connections | 14 pins |
| Mounting | Through-hole |
| Lead pitch | 2.54 mm |
| Package code | PDIP-14 |
| Thermal reference | See operating and package limits |
Operating reference
ST LM723C selected grade
Manufacturer specifications 5 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Supply range | 9.5–40 V | Maintain input/output headroom |
| Output range | 2–37 V | Appropriate external circuit required |
| Ambient | 0–70°C | LM723C; not extended-grade LM723 |
| Reference | 6.8–7.5 V; 7.15 V typical | IREF = 160 µA |
| Internal output capability | Up to 150 mA | Package dissipation and headroom limit actual use |
No specifications match. Try a parameter name or a unit.
Do not substitute extended-grade limits for the commercial parts.
Regulation and reference
25°C, manufacturer test circuit
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Line regulation | 0.01% typical; 0.1% max | 12–15 V input |
| Wide-range line regulation | 0.1% typical; 0.5% max | 12–40 V input |
| Load regulation | 0.03% typical; 0.2% max | 1–50 mA |
| Quiescent current | 2.3 mA typical; 4 mA max | 30 V input; no load |
| Ripple rejection | 74 dB typical | 100 Hz–10 kHz; no reference bypass |
| Current limit | 65 mA typical | RSC = 10 Ω; output shorted |
No specifications match. Try a parameter name or a unit.
Regulation values exclude changing junction temperature.
Five-volt circuit
Nominal calculation
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Input | 12 V | V+12 and VC11 |
| Reference divider | 4.3 kΩ / 10 kΩ | VREF6 → 4.3k → IN+5 → 10k → GND |
| Nominal output | 7.15 × 10 / 14.3 = 5 V | Reference and resistor tolerances remain |
| Current sense | 10 Ω | OUT10/CL2 → resistor → regulated output/CS3 |
| Feedback | 3 kΩ to IN−4 | From the regulated output |
| Compensation | 100 pF | COMP13 to IN−4 |
| Load | 1 kΩ | About 5 mA and 25 mW |
No specifications match. Try a parameter name or a unit.
No external pass transistor is needed for this small example.
Thermal and stress limits
LM723CN · PDIP-14
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Lead pitch | 2.54 mm | Through-hole |
| Input stress ceiling | 40 V | Do not exceed |
| Reference output stress current | 25 mA | LM723C absolute maximum; avoid designing at it |
| Maximum junction | 125°C | Selected commercial grade |
| θJA reference | 200°C/W DIP; 160°C/W SO14 | Manufacturer reference mounting |
| Storage | −65 to +150°C | Unpowered |
No specifications match. Try a parameter name or a unit.
A headline current limit does not remove the package power limit.
External connections
Physical package contacts
Manufacturer specifications 14 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| 1 · NC | Unused contact | Leave unconnected. |
| 2 · CL | Current-limit transistor base | Connect to OUT10 before the 10 Ω sense resistor. |
| 3 · CS | Current-sense transistor emitter | Connect to the regulated output after the sense resistor. |
| 4 · IN− | Error amplifier feedback | Connect to the regulated output through 3 kΩ; connect compensation capacitor here. |
| 5 · IN+ | Error amplifier reference input | Connect to the 4.3 kΩ / 10 kΩ reference-divider junction. |
| 6 · VREF | Nominal 7.15 V reference | Connect 4.3 kΩ to IN+5; 10 kΩ from IN+5 to ground. |
| 7 · V− | Control-circuit return | Connect to ground. |
| 8 · NC | Unused contact | Leave unconnected. |
| 9 · VZ | Internal zener connection | Leave open in this positive-output example. |
| 10 · OUT | Internal pass emitter | Connect CL2 and the input side of the 10 Ω sense resistor. |
| 11 · VC | Pass-transistor collector | Connect to +12 V. |
| 12 · V+ | Control-circuit positive supply | Connect to +12 V; bypass locally to ground. |
| 13 · COMP | Frequency compensation | Connect 100 pF between COMP13 and IN−4. |
| 14 · NC | Unused contact | Leave unconnected. |
No specifications match. Try a parameter name or a unit.
Connect all supply and return contacts; leave only explicitly unused contacts open.
Connections by function
Select a pin for its function, connection guidance and electrical notes.