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LM2940T-5.0/NOPB
Texas Instruments
IC REG LINEAR 5V 1A TO220-3
25460 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1A TO-220-3
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Minimum 1
5.0 / 5.0
- (56 Ratings)
LM2940T-5.0/NOPB
Product Overview
1364531
DiGi Electronics Part Number
LM2940T-5.0/NOPB-DGManufacturer
Texas Instruments
LM2940T-5.0/NOPB
Description
IC REG LINEAR 5V 1A TO220-3Inventory
25460 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1A TO-220-3
Quantity
Minimum 1
Minimum 1
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Warranty & Returns
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LM2940T-5.0/NOPB Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
Tube
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
Through Hole
Package / Case
TO-220-3
Supplier Device Package
TO-220-3
Base Product Number
LM2940
Datasheet & Documents
HTML Datasheet
LM2940T-5.0/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM2940T50NOPB
*LM2940T-5.0/NOPB
-LM2940T-5.0-NDR
-LM2940T-5.0/NOPB-DG
LM2940T-5.0-NDR
Standard Package
45
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
처음 주문인데, 직원들이 친절하고 전문적이었어요. 배송도 빠르고 포장도 깔끔했어요.
de desembre 02, 2025
Freunde empfehlen mir immer wieder die attraktiven Preise bei DiGi Electronics.
de desembre 02, 2025
They made solving my issues easy with their cheerful and helpful demeanor.
de desembre 02, 2025
The company’s post-sale support is consistent and reliable every time.
de desembre 02, 2025
The promptness of their support has helped me troubleshoot issues seamlessly.
de desembre 02, 2025
The overall shopping experience was hassle-free, thanks to the well-designed website and attentive customer service.
de desembre 02, 2025
The checkout process is smooth and straightforward, enhancing the overall shopping experience.
de desembre 02, 2025
Fast delivery combined with secure packaging made the experience excellent.
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Frequently Asked Questions (FAQ)
When designing in the LM2940T-5.0/NOPB, how do I ensure thermal stability under full 1A load with a high input voltage like 15V?
When using the LM2940T-5.0/NOPB with a 15V input and 5V output at 1A, the power dissipation is (15V - 5V) × 1A = 10W. The TO-220-3 package has a thermal resistance of approximately 50°C/W (junction-to-ambient without heatsink), which would result in a 500°C rise—far exceeding the 125°C max junction temperature. Always use a heatsink with low thermal resistance, and consider derating current or reducing input voltage if sustained high load is expected. Monitor junction temperature in situ or use thermal vias in PCB design to improve heat dissipation.
Can the LM2940T-5.0/NOPB replace an LM7805 in an industrial control circuit with noisy 12V input?
Yes, the LM2940T-5.0/NOPB is a better choice than LM7805 in such applications due to its lower dropout voltage (1V vs. ~2V) and better PSRR (64dB at 120Hz vs. typically 50–60dB). This means the LM2940T-5.0/NOPB maintains regulation more effectively under lower headroom and rejects more ripple, critical in noisy industrial environments. However, ensure thermal design accounts for similar or higher dissipation under dropout conditions. Also verify that the input does not exceed 26V, as LM7805 typically tolerates up to 35V.
What are the risks of using the LM2940T-5.0/NOPB in automotive applications with reverse battery events?
The LM2940T-5.0/NOPB includes built-in reverse polarity protection, making it robust against common automotive reverse battery faults. However, while the device protects itself, ensure input current is limited during reverse conditions to avoid excessive heating or damage to external components. Use in conjunction with a series diode or external MOSFET protection if sustained reverse voltage is expected. Always validate performance under load dump and cold crank conditions—though the device operates from -40°C to 125°C, power cycling under low input voltage (near dropout) may affect downstream stability.
How does the quiescent current of the LM2940T-5.0/NOPB affect battery life in always-on embedded systems?
The LM2940T-5.0/NOPB draws up to 10 mA quiescent current (and up to 15 mA supply current), which is relatively high for always-on, battery-powered applications. For example, in a 3.7V Li-ion system powering a 5V logic rail via boost converter first, this current alone could drain several percent of battery capacity daily. Consider duty-cycling the regulator or using a lower-Iq LDO (e.g., TPS7A02) when ultra-low standby power is required. The LM2940T-5.0/NOPB is better suited for line-powered or periodically active systems where its robustness outweighs leakage concerns.
What are the key design trade-offs between the LM2940T-5.0/NOPB and the AMS1117-5.0 in a 5V microcontroller power supply?
The LM2940T-5.0/NOPB offers superior thermal regulation, full 1A current capability, integrated protections (over current, over temperature, reverse polarity), and stable operation with low-ESR output capacitors—unlike the AMS1117-5.0, which requires higher ESR for stability. However, the AMS1117 is available in smaller SMD packages and has lower quiescent current (~5 mA). Use the LM2940T-5.0/NOPB when reliability, ruggedness, and through-hole mounting are priorities (e.g., industrial controls); choose AMS1117 only if board space or cost is critical and external protections are provided.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM2940T-5.0/NOPB CAD Models
Texas Instruments LM2940T-5.0/NOPB PCB symbols & footprints
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