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LM2940S-5.0
Texas Instruments
IC REG LIN 5V 1A DDPAK/TO263-3
1624 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
- (391 Ratings)
LM2940S-5.0
Product Overview
1320545
DiGi Electronics Part Number
LM2940S-5.0-DGManufacturer
Texas Instruments
LM2940S-5.0
Description
IC REG LIN 5V 1A DDPAK/TO263-3Inventory
1624 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1A TO-263 (DDPAK-3)
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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LM2940S-5.0 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
Tube
Series
-
Product Status
Last Time Buy
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
HTML Datasheet
LM2940S-5.0-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
LM2940S50
Standard Package
45
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
грудня 02, 2025
Durch die professionelle Unterstützung von DiGi Electronics konnten wir unsere Effizienz steigern.
грудня 02, 2025
The professionalism of their staff made my first purchase so comfortable.
грудня 02, 2025
The price transparency gives me confidence in every purchase.
грудня 02, 2025
The reliable logistics system reflects their commitment to quality and customer satisfaction.
грудня 02, 2025
DiGi Electronics’ support team is attentive and always willing to help.
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Frequently Asked Questions (FAQ)
LM2940S-5.0 DDPAK is marked ‘Last Time Buy’—what drop-in 1 A 5 V LDOs (TO-263-3) will still be available after 2025, and what PCB re-spin risks should I expect if I swap to MIC2937A-5.0WU today?
The only pin-equivalent, footprint-equivalent part guaranteed for long-term supply is the MIC2937A-5.0WU (Microchip). Re-spin checklist: (1) 2937A dropout is 0.6 V max @ 1 A vs. LM2940S-5.0’s 1 V—move the input cap 5 mm closer to the pins to keep ESR < 0.3 Ω and prevent 2937A instability; (2) 2937A has 75 mA ground current vs. 10 mA for LM2940S-5.0—verify the upstream 12 V rail can tolerate the extra 1 W heat in battery back-up mode; (3) 2937A reverse-battery protection is internal, but the LM2940S-5.0 needs an external diode—remove D1 or the 2937A will current-limit on automotive load-dump. Order 10% extra 2937A reels now; Microchip’s lead-time is 40 weeks vs. TI’s stock-out date of Q4-2024.
My truck-body ECU sees cold-crank down to 6.5 V; will LM2940S-5.0 still deliver 5 V @ 750 mA, or do I need a buck-boost pre-regulator, and how does this affect hold-up time on 470 µF?
LM2940S-5.0 dropout @ 750 mA is 0.75 V (typ), so 6.5 V in gives 5.75 V on the regulator input—head-room is only 0.75 V. At –40 °C the dropout curve rises 15 %, pushing you to the edge. Safe rule: maintain 1.2 V head-room under cold-crank. Solutions: (A) Use a 0.47 Ω series PTC in the 12 V rail to drop nominal voltage by 0.5 V so the LM2940S-5.0 runs cooler, or (B) front-end a tiny SOT23-5 buck-boost (TPS63020) set to 7 V. Option B recovers 6 ms extra hold-up on 470 µF because the downstream 5 V load sees 7 V stored energy instead of 6.5 V.
I’m replacing an old 7805 with LM2940S-5.0 in a D2PAK-3 on the same 2-layer 1 oz board that hits 105 °C case temp—do I need a heatsink, and how much derating should I apply vs. the MIC2940A-5.0WU competitor?
LM2940S-5.0 thermal resistance θJA on 2-layer, 300 mm² copper is 38 °C/W. At 105 °C ambient + 1 V dropout × 1 A = 1 W, junction hits 143 °C—15 °C below thermal shutdown but too close for 10-year life. Add a 15 mm × 15 mm × 10 mm alum heatsink (θSA 18 °C/W) or move to MIC2940A-5.0WU whose θJC is 3 °C/W better, giving 12 °C lower junction. Derate either part to 0.7 A above 85 °C ambient to keep MTBF > 200 kh.
Layout guy wants to place LM2940S-5.0 35 mm away from the 5 V load (GPS module) using 10 mil traces—how much load-step droop will I see at 500 mA pulsed, and can I substitute a 1 µF ceramic on the output?
10 mil trace 35 mm long has 70 mΩ round-trip; 500 mA pulse drops 35 mV, acceptable for GPS Vcc_min = 4.75 V. Bigger issue: 1 µF ceramic has ESR ≈ 5 mΩ, far below LM2940S-5.0’s 0.2 Ω minimum ESR requirement—ringing at 200 kHz is possible. Add a 1 Ω series resistor inside the 1 µF cap, or use a 22 µF POS-CAP (ESR 0.15 Ω). Keep the local 4.7 µF tantalum within 5 mm of the LM2940S-5.0 pins and place the 1 µF ceramic at the GPS supply pins to absorb RF.
Design for 24 V forklift supply hits 60 V load-dump; LM2940S-5.0 max Vin is only 26 V—what front-end clamp and TVS energy numbers prevent avalanche damage, and will BD50C0AFP2-CE2 survive instead?
LM2940S-5.0 internal absolute max is 60 V for < 1 ms, but continuous 60 V kills it. Use SMAJ33A TVS (33 V stand-off, 53 V clamp) plus 10 Ω, 2 W wire-wound resistor to absorb 3 J dump energy. BD50C0AFP2-CE2 (ROHM) has 50 V absolute max—still insufficient. Stick with LM2940S-5.0 plus TVS or switch to buck controller LM5007 (75 V rated) followed by LM2940S-5.0 as post-regulator; total BOM rises $0.18 but removes 60 V risk entirely.
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LM2940S-5.0 CAD Models
Texas Instruments LM2940S-5.0 PCB symbols & footprints
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