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LM3940IS-3.3 The Texas Instruments LM3940IS-3.3 is a 1A low-dropout linear voltage regulator providing a fixed 3.3V output. It operates from a 4.5V to 5.5V input and is suitable for systems requiring both 5V and 3.3V logic.
Mfr Part #:

LM3940IS-3.3

Available from 2 distributors
Mfr Name: Texas Instruments
Texas Instruments
The Texas Instruments LM3940IS-3.3 is a 1A low-dropout linear voltage regulator providing a fixed 3.3V output. It operates from a 4.5V to 5.5V input and is suitable for systems requiring both 5V and 3.3V logic.
✓ Total Stock: 3,264 pcs
$ Price Range: $0.28

LM3940IS-3.3 Available from 2 distributors

✓ Authorised
✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
Xingangxin ✓
Non-Authorised Inventory information
3,235 pcs
On Request
3235 pcs On Request 1 On Request On Request On Request On Request On Request
Akira Global ✓
Non-Authorised Inventory information
29 pcs
On Request
29 pcs On Request 1 On Request On Request On Request On Request On Request
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LM3940IS-3.3 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Accuracy
Current
Load Capacitance
Mounting Type
Noise
Number of Regulators
Operating Temperature
Output Configuration
Output Current
Output Type
Output Voltage
PSRR
Protection Features
Quiescent Current
Supplier Device Package
Voltage
Voltage Dropout (Max)
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LM3940IS-3.3 Description

Short technical summary and product information.

The LM3940IS-3.3 is a 1-Amp low-dropout (LDO) linear voltage regulator from Texas Instruments, designed to deliver a stable 3.3V output from a 5V supply. This makes it ideal for mixed-voltage systems where a 5V primary power bus is present alongside 3.3V logic.

 

Key electrical specifications include an input voltage range of 4.5V to 5.5V and a maximum output current of 1A. The regulator features a low noise level of 150 µVrms and a Power Supply Rejection Ratio (PSRR) of 32 dB at 100 KHz. Its typical quiescent current is 0.11 mA. The device offers excellent load regulation and built-in protection against over-temperature and short circuits.

 

The LM3940IS-3.3 is available in a DDPAK/TO-263-3 surface-mount package, minimizing board space while providing good power dissipation. The TO-220 package variant can typically deliver the full 1A load current without an additional heatsink. The operating temperature range is -40°C to 125°C.

LM3940IS-3.3 Quick Information

Product Type: Linear Voltage Regulator
Series: LM3940
Canonical Name: LM3940IS-3.3 1-A, 3.3V Fixed Output Low-Dropout Linear Voltage Regulator
Subcategory: Low-Dropout (LDO) Regulators

LM3940IS-3.3 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

LM3940IS-3.3 Estimated Pricing

Qty Low High
1+ $0.28 $0.28

Estimated market price range - modelled values for guidance only, not live distributor offers.

LM3940IS-3.3 Features

  • 1-Amp output current capability.
  • Fixed 3.3V output voltage.
  • Low 4.5V to 5.5V input voltage range.
  • Surface mount DDPAK/TO-263-3 package.
  • Built-in over-temperature protection.

LM3940IS-3.3 Applications

  • Ideal for 5V to 3.3V conversion.
  • Suitable for mixed-voltage systems.
  • Powering 3.3V logic from 5V bus.
  • General purpose voltage regulation.

LM3940IS-3.3 FAQs

7 frequently asked questions generated from this part’s specifications.
What is the input voltage range for the LM3940IS-3.3?

The input voltage range is 4.5V to 5.5V.

What output voltage does the LM3940IS-3.3 provide?

The output voltage is fixed at 3.3V.

What is the maximum output current?

The maximum output current is 1A.

What is the dropout voltage of the LM3940IS-3.3?

The typical dropout voltage is 310mV.

What is the operating temperature range?

The operating temperature range is -40°C to 125°C.

What package is the LM3940IS-3.3 available in?

It is available in a DDPAK/TO-263-3 surface-mount package.

What protection features does the LM3940IS-3.3 include?

It includes over-temperature protection and short-circuit protection.

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