LM4120IM5-3.3 Equivalent & Substitute Parts

Part Overview

The LM4120IM5-3.3 is a Series Voltage Reference IC from Texas Instruments, delivering a fixed 3.3V output with ±0.5% tolerance in a SOT-23-5 surface mount package. This component is classified as Obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The LM4120IM5-3.3 operates across a 2V to 12V input range with 5 mA output current capability and is suitable for applications requiring stable voltage reference generation in compact form factors.

Substiute Parts

LM4120IM5-3.3

Texas InstrumentsIn Stock: 5775LM4120IM5-3.3 Datasheet

Current PartRFQ

REF4132B33DBVR

Texas InstrumentsIn Stock: 3253REF4132B33DBVR Datasheet

MFR RecommendedRFQ

LM4120IM5-3.3/NOPB

Texas InstrumentsIn Stock: 8869LM4120IM5-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LM4120IM5X-3.3/NOPB

Texas InstrumentsIn Stock: 4659LM4120IM5X-3.3/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM4120IM5-3.3 is determined by the following critical parameters: fixed 3.3V output voltage, SOT-23-5 package compatibility, surface mount mounting type, and electrical specifications including tolerance, temperature coefficient, and input voltage range.

Substitute parts are grouped into two categories:

Parametric Equivalents maintain identical electrical specifications and packaging. These parts are direct replacements with the same tolerance (±0.5%), temperature coefficient (50 ppm/°C), output current (5 mA), and input voltage range (2V ~ 12V). Parametric equivalents differ only in product status or packaging format (Cut Tape vs. Tape & Reel).

Manufacturer Recommended Substitute offers improved electrical performance while maintaining the same 3.3V output, SOT-23-5 package, and surface mount configuration. This substitute provides tighter tolerance (±0.05%), lower temperature coefficient (30 ppm/°C), higher output current (10 mA), and extended operating temperature range (-40°C ~ 125°C), making it suitable for applications requiring enhanced stability and performance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents): LM4120IM5-3.3/NOPB and LM4120IM5X-3.3/NOPB are suitable for applications requiring identical electrical performance to the original LM4120IM5-3.3. Both parts maintain the same tolerance, temperature coefficient, and operating specifications. LM4120IM5-3.3/NOPB carries Last Time Buy status with higher inventory availability (8797 Pcs), while LM4120IM5X-3.3/NOPB also carries Last Time Buy status with 4635 Pcs available. Both are ROHS3 compliant with MSL 1 rating.

For Enhanced Performance: REF4132B33DBVR is the manufacturer-recommended substitute, offering Active product status with superior electrical characteristics. This part provides tighter tolerance (±0.05% vs. ±0.5%), lower temperature coefficient (30 ppm/°C vs. 50 ppm/°C), higher output current capability (10 mA vs. 5 mA), and extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C). REF4132B33DBVR also features lower supply current (100 µA vs. 275 µA). The input voltage range is narrower (3.35V ~ 5.5V), which must be verified against circuit requirements. REF4132B33DBVR is ROHS3 compliant with MSL 2 rating and 3200 Pcs in stock.

All substitute parts maintain SOT-23-5 package compatibility and surface mount configuration, ensuring mechanical and electrical interchangeability within the specified parameter constraints.

Frequently Asked Questions (FAQ)

Q: Can LM4120IM5-3.3/NOPB and LM4120IM5X-3.3/NOPB be used interchangeably with the original LM4120IM5-3.3?

A: Yes. Both parts are parametric equivalents with identical electrical specifications: 3.3V output, ±0.5% tolerance, 50 ppm/°C temperature coefficient, 5 mA output current, and 2V ~ 12V input range. The difference is packaging format (Tape & Reel vs. Cut Tape) and product status (Last Time Buy vs. Obsolete). Electrical performance and pin configuration are identical.

Q: What are the key differences between the parametric equivalents and REF4132B33DBVR?

A: REF4132B33DBVR offers improved specifications: ±0.05% tolerance (vs. ±0.5%), 30 ppm/°C temperature coefficient (vs. 50 ppm/°C), 10 mA output current (vs. 5 mA), 100 µA supply current (vs. 275 µA), and -40°C ~ 125°C operating range (vs. -40°C ~ 85°C). However, the input voltage range is narrower: 3.35V ~ 5.5V versus 2V ~ 12V. REF4132B33DBVR is Active status, making it the long-term solution.

Q: Is REF4132B33DBVR compatible with circuits designed for the LM4120IM5-3.3?

A: REF4132B33DBVR is pin-compatible in SOT-23-5 package and provides the same 3.3V output. However, verify that your circuit's input voltage supply falls within 3.35V ~ 5.5V range. If your design requires input voltages below 3.35V or above 5.5V, the parametric equivalents (LM4120IM5-3.3/NOPB or LM4120IM5X-3.3/NOPB) must be used instead.

Q: Why is the LM4120IM5-3.3 marked as Obsolete?

A: Obsolete status indicates the part is no longer manufactured. Parametric equivalents (LM4120IM5-3.3/NOPB and LM4120IM5X-3.3/NOPB) are available as Last Time Buy, with limited inventory. REF4132B33DBVR is the recommended long-term alternative with Active status and continuous availability.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Both are surface mount formats for the SOT-23-5 package. Tape & Reel (TR) is standard for high-volume production and automated assembly. Cut Tape (CT) is used for smaller quantities or manual assembly. Electrical specifications and pin configuration are identical.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LM4120IM5-3.3, LM4120IM5-3.3/NOPB, LM4120IM5X-3.3/NOPB, and REF4132B33DBVR are all ROHS3 compliant. Moisture sensitivity levels differ: LM4120 variants have MSL 1 (Unlimited), while REF4132B33DBVR has MSL 2 (1 Year).