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LM2940SX-5.0/NOPB
Texas Instruments
IC REG LIN 5V 1A DDPAK/TO263-3
18964 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1A TO-263 (DDPAK-3)
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5.0 / 5.0
- (389 Ratings)
LM2940SX-5.0/NOPB
Product Overview
1360437
DiGi Electronics Part Number
LM2940SX-5.0/NOPB-DGManufacturer
Texas Instruments
LM2940SX-5.0/NOPB
Description
IC REG LIN 5V 1A DDPAK/TO263-3Inventory
18964 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1A TO-263 (DDPAK-3)
Quantity
Minimum 1
Minimum 1
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LM2940SX-5.0/NOPB Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Output Configuration
Positive
Output Type
Fixed
Number of Regulators
1
Voltage - Input (Max)
26V
Voltage - Output (Min/Fixed)
5V
Voltage - Output (Max)
-
Voltage Dropout (Max)
1V @ 1A
Current - Output
1A
Current - Quiescent (Iq)
10 mA
Current - Supply (Max)
15 mA
PSRR
64dB (120Hz)
Control Features
-
Protection Features
Over Current, Over Temperature, Reverse Polarity, Short Circuit
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Supplier Device Package
TO-263 (DDPAK-3)
Base Product Number
LM2940
Datasheet & Documents
Manufacturer Product Page
LM2940SX-5.0/NOPB Specifications
HTML Datasheet
LM2940SX-5.0/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Affected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
-LM2940SX-5.0/NOPBCT-DG
LM2940SX-5.0/NOPBDKR
LM2940SX-5.0/NOPBTR
LM2940SX-5.0TR-NDR
LM2940SX50NOPB
LM2940SX-5.0/NOPBCT
-LM2940SX-5.0/NOPBCT
Standard Package
500
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
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de desembre 02, 2025
商品カテゴリーが整理されており、欲しいものに簡単にアクセスできました。
de desembre 02, 2025
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de desembre 02, 2025
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de desembre 02, 2025
Super fast shipping and courteous support made my shopping experience delightful.
de desembre 02, 2025
The order arrived swiftly, protected by sustainable packaging solutions.
de desembre 02, 2025
Fast shipping combined with excellent after-sales service makes DiGi Electronics a trusted partner.
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Frequently Asked Questions (FAQ)
Can the LM2940SX-5.0/NOPB safely replace an LM7805 in a high-temperature industrial application where ambient temperatures reach 70°C and the input voltage is 12V?
While both the LM2940SX-5.0/NOPB and LM7805 provide 5V fixed output, the LM2940SX-5.0/NOPB is a better choice for high-temperature environments due to its superior thermal performance in the TO-263 (DDPAK-3) package and lower dropout voltage (1V max at 1A vs. ~2V for the LM7805). However, at 12V input and 1A load, power dissipation reaches 7W—requiring a substantial heatsink even with the LM2940SX-5.0/NOPB. Ensure junction temperature stays below 125°C by calculating thermal resistance (θJA) with your PCB layout and heatsink. The LM2940SX-5.0/NOPB also includes reverse polarity protection, which the standard LM7805 lacks—a critical advantage in field-deployed systems.
What are the risks of using the LM2940SX-5.0/NOPB in a battery-powered system with a 9V lithium pack that drops to 6.5V under load, and how does dropout voltage affect runtime?
The LM2940SX-5.0/NOPB has a maximum dropout voltage of 1V at 1A, meaning it requires at least 6V input to maintain regulation. As your 9V lithium pack sags to 6.5V under load, the regulator will enter dropout, causing output instability and reduced efficiency. This not only risks microcontroller resets but also increases quiescent current draw during brownout conditions. Consider using a low-dropout (LDO) alternative like the TPS7A4700 (dropout ~200mV) or switching to a buck converter for better efficiency. If you must use the LM2940SX-5.0/NOPB, limit load current to <500mA to reduce dropout and extend usable battery life.
Is the LM2940SX-5.0/NOPB a drop-in replacement for the older LM2940CT-5.0 in a legacy through-hole design, and what layout changes are needed for the TO-263 package?
The LM2940SX-5.0/NOPB (TO-263 surface-mount) is electrically equivalent to the through-hole LM2940CT-5.0 but not a mechanical drop-in. You’ll need to redesign the PCB to accommodate surface mounting, with careful attention to thermal pad soldering and copper pour for heat dissipation. The tab on the LM2940SX-5.0/NOPB must be connected to ground and tied to a large copper area (≥1 in²) on the top and bottom layers with thermal vias to meet thermal requirements. Unlike the TO-220 package, the TO-263 relies heavily on PCB conduction for cooling—poor layout can lead to thermal shutdown even at moderate loads.
How does the LM2940SX-5.0/NOPB compare to the MIC2940A-5.0WT in terms of reverse polarity protection and long-term reliability in automotive environments?
Both the LM2940SX-5.0/NOPB and MIC2940A-5.0WT offer reverse polarity protection and similar dropout performance, but the LM2940SX-5.0/NOPB has a wider operating temperature range (-40°C to 125°C vs. -40°C to 125°C nominal for MIC2940A, but with less proven field data in harsh environments). Texas Instruments provides more extensive reliability testing documentation for the LM2940SX-5.0/NOPB, including HTRB and ESD robustness, which is critical for automotive under-hood applications. Additionally, the LM2940SX-5.0/NOPB’s MSL 3 rating requires controlled storage and baking if exposed to moisture—important for high-humidity assembly lines. For mission-critical automotive designs, the LM2940SX-5.0/NOPB is often preferred due to TI’s qualification heritage and broader support ecosystem.
Can the LM2940SX-5.0/NOPB handle input voltage transients up to 30V in a 24V industrial system without external protection, and what failure modes should I anticipate?
The LM2940SX-5.0/NOPB has a maximum input voltage rating of 26V, so 30V transients—common in 24V industrial systems due to inductive load switching—will exceed its absolute maximum rating and likely cause catastrophic failure. Even brief overvoltage events can degrade the internal pass transistor or trigger latch-up. To safely use the LM2940SX-5.0/NOPB in such environments, add a TVS diode (e.g., SMAJ28A) at the input and consider a series fuse or PTC resettable fuse for fault containment. Alternatively, use a regulator with higher input tolerance like the LM2941CT (30V max) or a pre-regulator stage. Without protection, repeated transients will lead to premature failure, especially under load, making system reliability unacceptable for industrial deployments.
Quality Assurance (QC)
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LM2940SX-5.0/NOPB CAD Models
Texas Instruments LM2940SX-5.0/NOPB PCB symbols & footprints
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