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LM340 -
Series 3-Terminal Positive Regulators
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Features
| | Complete specifications at 1A load |
| | Output voltage tolerances of ±2% at Tj = 25°C and ±4% over the temperature range (LM340A) |
| | Line regulation of 0.01% of VOUT/V of [Delta]VIN at 1A load (LM340A) |
| | Load regulation of 0.3% of VOUT/A (LM340A) |
| | Internal thermal overload protection |
| | Internal short-circuit current limit |
| | Output transistor safe area protection |
| | P+ Product Enhancement tested |
General Description
The LM140/LM340A/LM340/LM78XXC monolithic 3-terminal positive voltage regulators employ internal current-limiting, thermal shutdown and safe-area compensation, making them essentially indestructible. More...
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Typical Application
click for larger image
| Parameters | Values |
| Output Current |
1000 mA |
| Output Voltage |
7.5, 12, 15, 8, 5 Volt |
| Input Min Voltage |
7.5, 14.8, 10.5, 17.9 Volt |
| Input Max Voltage |
35 Volt |
| Adjustable Output |
No |
| On/Off Pin |
No |
| Error Flag |
No |
| Temperature Min |
0 deg C |
| Temperature Max |
70, 125 deg C |
| RegType |
Linear Regulator |
Typical Performance
*click for larger image
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Also Recommended
| LP38690▲ | Lower Quiescent Current, Stable With Ceramic Output Capacitors |
| LP38692▲ | Lower Quiescent Current, Stable With Ceramic Output Capacitors & Enable Pin |
| LP8340▲ | Improved Dropout Voltage, Supply Current |
Additional Resources
Application Notes

Connection Diagram
*click for larger image
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Datasheet
Package Availability, Models, Samples & Pricing
| Obsolete Part | Alternate Part or
Supplier | Source | Last Time Buy Date |
LM340AK-5.0
| NONE
| NONE
| 08 Sep 1999
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LM340AS-5.0
| LM340AT-5.0
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM340ASX-5.0
| LM340AT-5.0
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM340AT-12
| NONE
| NONE
| 06 Sep 2000
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LM340AT-15
| NONE
| NONE
| 06 Sep 2000
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LM340K-12
| LM140K-12
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM340K-15
| LM117 STEEL
| NSCE
| 03 Dec 2008
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LM340LAH-12
| LM140H-12/883
| NATIONAL SEMICONDUCTOR
| 03 Dec 2008
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LM340LAH-15
| NONE
| NONE
| 08 Sep 1999
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LM340LAH-5.0
| LM140H-5.0/883
| NATIONAL SEMICONDUCTOR
| 03 Dec 2008
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LM340LAZ-12
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LM340LAZ-15
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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General Description
The LM140/LM340A/LM340/LM78XXC monolithic 3-terminal positive voltage regulators employ internal current-limiting, thermal shutdown and safe-area compensation, making them essentially indestructible. If adequate heat sinking is provided, they can deliver over 1.0A output current. They are intended as fixed voltage regulators in a wide range of applications including local (on-card) regulation for elimination of noise and distribution problems associated with single-point regulation. In addition to use as fixed voltage regulators, these devices can be used with external components to obtain adjustable output voltages and currents.
Considerable effort was expended to make the entire series of regulators easy to use and minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if the regulator is located far from the filter capacitor of the power supply.
The 5V, 12V, and 15V regulator options are available in the steel TO-3 power package. The LM340A/LM340/LM78XXC series is available in the TO-220 plastic power package, and the LM340-5.0 is available in the SOT-223 package, as well as the LM340-5.0 and LM340-12 in the surface-mount TO-263 package.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LM340AS-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340ASX-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340AT-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340MP-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340MPX-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340S-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340S-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340SX-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340SX-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340T-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340T-15 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM340T-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM7808CT | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
Application Notes
| Title | Size in Kbytes |
Date |
 |
| AN-103: Application Note 103 LM340 Series Three Terminal Positive Regulators |
421 Kbytes |
3-Oct-02 |
Download |
| AN-1529: Application Note 1529 LM3430 Evaluation Board |
2770 Kbytes |
21-Aug-07 |
Download |
AN-1529 (Chinese): Application Note 1529 LM3430 Evaluation Board
|
789 Kbytes |
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| AN-298: Application Note 298 Isolation Techniques for Signal Conditioning |
379 Kbytes |
2-Oct-02 |
Download |
| AN-181: Application Note 181 3-Terminal Regulator Is Adjustable |
165 Kbytes |
1-May-04 |
Download |
| AN-1148: Application Note 1148 Linear Regulators: Theory Of Operation and Compensation |
200 Kbytes |
10-May-04 |
Download |
AN-1148 (Japanese): Application Note 1148 Linear Regulators: Theory Of Operation and Compensation
 |
216 Kbytes |
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AN-1148 (Chinese): Application Note 1148 Linear Regulators: Theory Of Operation and Compensation
|
396 Kbytes |
|
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| AN-127: Application Note 127 LM143 Monolithic High Voltage Operational Amplifier Applications |
441 Kbytes |
2-May-04 |
Download |
| AN-1192: Application Note 1192 Overture™ Series High Power Solutions |
548 Kbytes |
15-Jun-04 |
Download |
More Application Notes
| Title | Size in Kbytes |
Date |
 |
| AN-1982: Application Note 1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool |
63 Kbytes |
15-Jul-09 |
Download |
| AN-1545: Application Note 1545 LM3404/LM3404HV Evaluation Board |
665 Kbytes |
14-Aug-09 |
Download |
AN-1545 (Chinese): Application Note 1545 LM3404/LM3404HV Evaluation Board
|
493 Kbytes |
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| AN-182: Application Note 182 Improving Power Supply Reliability with IC Power Regulators |
27 Kbytes |
3-Oct-02 |
Download |
| AN-1853: Application Note 1853 COT Drivers Control LED Ripple Current |
158 Kbytes |
23-Sep-08 |
Download |
| AN-1954: Application Note 1954 LM3409 Demonstration Board |
607 Kbytes |
11-Jun-09 |
Download |
AN-1954 (Chinese): Application Note 1954 LM3409 Demonstration Board
|
502 Kbytes |
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[Information as of 8-Nov-2009]
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