LM3940ISX-3.3/NOPB is out of stock and can be placed on backorder.
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Linear Voltage Regulator IC Positive Fixed 1 Output 1A TO-263 (DDPAK-3)
Image shown is a representation only. Exact specifications should be obtained from the product data sheet.
Linear Voltage Regulator IC Positive Fixed 1 Output 1A TO-263 (DDPAK-3)
What is a Voltage Regulator Another Teaching Moment | Digi-Key Electronics

LM3940ISX-3.3/NOPB

DigiKey Part Number
LM3940ISX-3.3/NOPBTR-ND - Tape & Reel (TR)
LM3940ISX-3.3/NOPBCT-ND - Cut Tape (CT)
LM3940ISX-3.3/NOPBDKR-ND - Digi-Reel®
Manufacturer
Manufacturer Product Number
LM3940ISX-3.3/NOPB
Description
IC REG LINEAR 3.3V 1A TO263
Manufacturer Standard Lead Time
12 Weeks
Customer Reference
Detailed Description
Linear Voltage Regulator IC Positive Fixed 1 Output 1A TO-263 (DDPAK-3)
Datasheet
 Datasheet
EDA/CAD Models
LM3940ISX-3.3/NOPB Models
Product Attributes
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Category
Voltage Dropout (Max)
0.2V @ 100mA
Mfr
Current - Output
Packaging
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Protection Features
Over Temperature, Short Circuit
Part Status
Active
Operating Temperature
-40°C ~ 125°C
Output Configuration
Mounting Type
Surface Mount
Output Type
Package / Case
TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Number of Regulators
1
Supplier Device Package
TO-263 (DDPAK-3)
Voltage - Input (Max)
7.5V
Base Product Number
Voltage - Output (Min/Fixed)
3.3V
Environmental & Export Classifications
Product Questions and Answers
Additional Resources
Substitutes (9)
Part NumberManufacturerQuantity AvailableDigiKey Part NumberUnit PriceSubstitute Type
TC1262-3.3VEBTRMicrochip Technology3,315TC1262-3.3VEBTR-ND$1.16000Similar
MIC2940A-3.3WU-TRMicrochip Technology1,768MIC2940A-3.3WU-TR-ND$2.67000Similar
MIC2937A-3.3WU-TRMicrochip Technology1,500MIC2937A-3.3WU-TR-ND$3.19000Similar
MIC2940A-3.3WUMicrochip Technology255576-1135-ND$2.67000Similar
MIC2937A-3.3WUMicrochip Technology35576-1131-ND$3.19000Similar
In-Stock: 0
500 past due; estimated in-stock on 22-Oct-2026
Request Stock Notification
All prices are in USD
Cut Tape (CT) & Digi-Reel®
QuantityUnit PriceExt Price
1$2.29000$2.29
10$1.69400$16.94
25$1.54600$38.65
100$1.38240$138.24
250$1.30452$326.13
* All Digi-Reel orders will add a $7.00 reeling fee.
Tape & Reel (TR)
QuantityUnit PriceExt Price
500$1.25756$628.78
1,000$1.21889$1,218.89
1,500$1.19953$1,799.30
2,500$1.17808$2,945.20
3,500$1.16554$4,079.39
5,000$1.15348$5,767.40
Tariff Status: Tariff may apply if shipping to the United States. Tariff costs are calculated and will be displayed in the shopping cart.