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LM2940LD-5.0/NOPB
Texas Instruments
IC REG LINEAR 5V 1A 8WSON
2793 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1A 8-WSON (4x4)
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5.0 / 5.0
- (54 Ratings)
LM2940LD-5.0/NOPB
Product Overview
1330466
DiGi Electronics Part Number
LM2940LD-5.0/NOPB-DGManufacturer
Texas Instruments
LM2940LD-5.0/NOPB
Description
IC REG LINEAR 5V 1A 8WSONInventory
2793 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1A 8-WSON (4x4)
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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LM2940LD-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
8-WDFN Exposed Pad
Supplier Device Package
8-WSON (4x4)
Base Product Number
LM2940
Datasheet & Documents
HTML Datasheet
LM2940LD-5.0/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-35172-6
LM2940LD50NOPB
296-35172-1
296-35172-2
LM2940LD-5.0/NOPB-DG
-LM2940LD
Standard Package
1,000
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
Intuitive design elements guide users naturally through the various sections.
de desembre 02, 2025
I highly recommend DiGi Electronics for their exceptional quality and support.
de desembre 02, 2025
The online platform is well-organized, allowing me to find what I need effortlessly every time.
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Frequently Asked Questions (FAQ)
Can the LM2940LD-5.0/NOPB reliably replace an LM7805 in a 12V automotive application with frequent load transients, and what design risks should I consider?
Yes, the LM2940LD-5.0/NOPB can replace an LM7805 in a 12V automotive system, but with important caveats. Unlike the through-hole LM7805, the LM2940LD-5.0/NOPB is a surface-mount 8-WSON device with a lower dropout voltage (1V max at 1A), making it more efficient. However, its exposed pad requires proper thermal management—ensure a solid ground plane and adequate copper pour for heat dissipation. Additionally, while both offer overcurrent and thermal shutdown, the LM2940LD-5.0/NOPB includes reverse polarity protection, which is critical in automotive environments. Be cautious of input voltage spikes above 26V; use a TVS diode if load dump conditions are expected. Always validate transient response with your actual load profile.
What are the thermal risks when using the LM2940LD-5.0/NOPB at 1A output with a 15V input in a compact PCB layout without forced airflow?
Operating the LM2940LD-5.0/NOPB at 1A with a 15V input results in a 10V dropout, dissipating 10W of power—exceeding its 8W package rating. This creates a high risk of thermal runaway, even with the exposed pad. The junction temperature can easily surpass the 125°C limit in ambient temperatures above 50°C without significant copper heatsinking. To mitigate this, increase the PCB copper area connected to the thermal pad (recommend ≥2 in² of 2oz copper), use thermal vias, and consider derating the output current or reducing input voltage. For sustained high-power operation, evaluate switching regulators like the TPS5430 instead.
How does the LM2940LD-5.0/NOPB compare to the MIC2940A-5.0BM in terms of dropout voltage, quiescent current, and long-term reliability in battery-powered industrial sensors?
The LM2940LD-5.0/NOPB has a higher dropout voltage (1V max at 1A) compared to the MIC2940A-5.0BM (typically 0.5V at 1A), making the latter more suitable for low-headroom battery applications. Additionally, the LM2940LD-5.0/NOPB draws 10mA quiescent current, while the MIC2940A-5.0BM uses only 250µA—critical for long-life sensor nodes. However, the LM2940LD-5.0/NOPB offers superior reverse polarity protection and operates up to 125°C, beneficial in harsh environments. For battery longevity, the MIC2940A is preferable; for ruggedness and integrated protection, the LM2940LD-5.0/NOPB may justify its higher power draw.
Is the LM2940LD-5.0/NOPB suitable for 24V industrial systems where input voltage can briefly spike to 30V during switching events?
No, the LM2940LD-5.0/NOPB is not suitable for 24V systems with 30V transients, as its maximum input voltage is 26V. Exceeding this can cause immediate damage, even with short-duration spikes. In industrial settings with inductive loads or relay switching, use a pre-regulator (e.g., a buck converter like the LM2596) to step down to 12–15V before the LM2940LD-5.0/NOPB, or select a regulator rated for 40V+ inputs such as the LT1086CT-5. Always include input filtering and a transient voltage suppressor (TVS) rated for 28V clamping to protect against surges.
What layout practices are critical to prevent oscillation or instability in the LM2940LD-5.0/NOPB when used with long input/output traces in a noisy environment?
To ensure stability with the LM2940LD-5.0/NOPB, minimize loop area by placing input and output capacitors as close as possible to the IC—use low-ESR ceramic capacitors (e.g., 10µF X5R) on both pins. Avoid long traces between the regulator and capacitors, as parasitic inductance can cause ringing or oscillation. The exposed thermal pad must be soldered to a solid ground plane with multiple vias to reduce thermal resistance and ground impedance. In noisy environments, add a small ferrite bead on the input line and consider a π-filter if EMI is a concern. Poor layout can induce instability even with correct capacitance values, so follow TI’s recommended PCB layout guidelines precisely.
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LM2940LD-5.0/NOPB CAD Models
Texas Instruments LM2940LD-5.0/NOPB PCB symbols & footprints
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