LM3940IS-3.3/NOPBIn StockTexas Instruments
LM3940IS-3.3/NOPB is a 1A low dropout linear regulator converting 5V to 3.3V output with only 0.31V typical dropout voltage. Features fixed 3.3V output, up to 1A load current, and 7.5V absolute maximum input. From $1.42, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- TO-XXX (Inc. DPAK)
- Pin Count
- 4
- Lifecycle
- ACTIVE
- Datasheet
- LM3940IS-3.3/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.4225(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 1A output current capability with only 0.31V typical dropout voltage for efficient 5V-to-3.3V conversion
- Fixed 3.3V output voltage with tight regulation, ideal for direct microcontroller and logic supply
- Wide input voltage range 4.5V to 5.5V with 7.5V absolute maximum for robust system compatibility
- TO-92/DPAK package options enable both through-hole and surface-mount board designs
- RoHS-compliant (Pb-free) construction meeting modern environmental and compliance requirements
Applications
The LM3940IS-3.3/NOPB is widely used in embedded systems and IoT devices that require a stable 3.3V supply derived from a 5V bus, such as microcontroller boards, FPGAs, and sensor modules. It suits portable consumer electronics and industrial control equipment where low dropout voltage minimizes power dissipation and extends battery life. The component also fits telecommunications and data-acquisition hardware needing a dependable point-of-load regulator with minimal external components.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Not Compliant |
| YTEOL | 15 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 1V |
| Dropout Voltage1-Nom | 0.31V |
| Input Voltage Absolute-Max | 7.5V |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 4.5V |
| JESD-30 Code | R-PSSO-G3 |
| JESD-609 Code | e3 |
| Line Regulation-Max | 0.04% |
| Load Regulation-Max | 0.08% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 1A |
| Output Voltage1-Max | 3.47V |
| Output Voltage1-Min | 3.13V |
| Output Voltage1-Nom | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SMSIP3H,.55TB |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 245 |
| Qualification Status | Not Qualified |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 2.54mm |
| Terminal Position | SINGLE |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 5.2% |
| ## LM3940IS-3.3/NOPB Alternates Showing results | Image |
| Package | TO-XXX (Inc. DPAK) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LM3940IS-3.3/NOPB:
Regulator, 3.3V, 1V Dropout, BIPolar, PSSO3
Regulator, 3.3V, 1V Dropout, BIPolar, PSSO3
suggested
suggested
Frequently Asked Questions
What is the dropout voltage of the LM3940IS-3.3/NOPB?
The LM3940IS-3.3/NOPB has a typical dropout voltage of 0.31V and a maximum of 1V at full 1A load current, allowing reliable 3.3V output from a 4.5V to 5.5V input supply without excessive headroom.
What applications is the LM3940IS-3.3/NOPB best suited for?
It is ideal for powering 3.3V microcontrollers, FPGAs, wireless modules, and sensor ICs directly from a 5V system bus. Its low dropout and 1A current rating make it suitable for embedded systems, IoT devices, industrial controllers, and any design converting a standard 5V rail to 3.3V logic voltage.
What package is the LM3940IS-3.3/NOPB available in?
The LM3940IS-3.3/NOPB is available in the TO-92/DPAK style surface-mount package (TO-XXX family), offering a compact, low-profile footprint suitable for surface-mount PCB assembly in space-constrained designs.
Is the LM3940IS-3.3/NOPB RoHS compliant?
Yes, the LM3940IS-3.3/NOPB carries a Pb-free (RoHS) designation, meaning it uses lead-free solder finish and complies with RoHS environmental directives, making it suitable for products sold in EU and other regulated markets.
Where can I buy the LM3940IS-3.3/NOPB and what is the price?
The LM3940IS-3.3/NOPB is available from FindMyChip starting at $1.42 per unit. Stock is available globally with worldwide shipping, and you can submit a quote request directly on the product page for bulk pricing.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $2.2760 | $2.28 |
| 3+ | $1.7070 | $5.12 |
| 16+ | $1.4225 | $22.76 |
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