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LM138T — TO-220 package (representative)
TO-220
Representative of package type
National Semiconductor Corp

LM138T

Linear Voltage Regulator · TO-220 · Analog
Part Status: Obsolete
Data last refreshed Jun 19, 2026
Manufacturer
National Semiconductor Corp
Mfr Part #
LM138T
Series
LM138
Category
Linear Voltage Regulator
Datasheet
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Availability & Pricing
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Product Attributes

Electrical & Parametric
Output Current5A
Output Voltage1.2-32 V
Input Voltage Max40 V
Physical & Thermal
Package / CaseTO-220
Mounting TypeThrough Hole
SeriesLM138
Operating Temperature-55°C ~ 150°C
Classification & Lifecycle
CategoryLinear Voltage Regulator
TypeAnalog
Part StatusObsolete

5A adjustable positive voltage regulator, 1.2-32V

Part Activity

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LM138T viewed on the web · Web User
LM138T viewed on the web · Web User
LM138T viewed on the web · Web User

Recent search and sourcing activity for LM138T.

Engineering FAQ

LM138T is marked Obsolete — how does ZDI assure authenticity?
Obsolete and end-of-life parts carry elevated counterfeit risk, which is exactly why ZDI routes every lot through the full EQuality Process™ — validation, QI-1 and QI-2/camera inspection, RoHS verification, bake and bag-and-tag, and QI-3 final inspection — with source-country supplier vetting and full lot traceability before release.
What are the key specifications of LM138T?
Output Current: 5A; Output Voltage: 1.2-32 V; Input Voltage Max: 40 V.
What package is LM138T supplied in?
LM138T is supplied in the TO-220 package, through hole, rated -55°C ~ 150°C.
Can ZDI source LM138T beyond the quantities shown?
Yes — ZD Integrated Circuits specializes in sourcing hard-to-find, obsolete, and excess electronic components through its global network, with counterfeit-avoidance inspection on every lot. Submit an RFQ with your target quantity for availability and pricing.

Documents & Media

Quality & Counterfeit Avoidance

ISO 9001 ERAI Member ESD Certified GIDEP Participant ZDI EQuality Process CAGE Code 1V8K2

ZD Integrated Circuits operates an ISO 9001-certified quality system incorporating JEDEC-standard process-control elements. In an era of global sourcing and internet procurement, standards compliance alone no longer assures component authenticity — so ZDI pioneered a multi-layered counterfeit-avoidance program: supplier analysis at the source-country level, detailed component analysis, defined inspection standards for all incoming devices, and stringent supplier rating and review. These programs let ZDI guarantee the integrity and the source of every component it ships.

Every lot moves through ZDI's EQuality Process™ — validation, QI-1 and QI-2/camera inspection, RoHS verification, bake and bag-and-tag, and QI-3 final inspection — with Quality-Manager disposition before release. Nonconforming material is quarantined; conforming material is warehoused or shipped.

✓Multi-stage EQuality Process™ inspection (QI-1 · QI-2/camera · QI-3)
✓Source-country supplier analysis, rating & review
✓Incoming inspection, RoHS verification, bake, full lot traceability
✓ESD-controlled handling · authentic parts guaranteed

LM138T is marked Obsolete. Obsolete and end-of-life parts carry elevated counterfeit risk — exactly why ZDI routes them through the full EQuality Process™ with source-country supplier vetting, inspection, and traceability.

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