LP2981-33DBVRE4 Equivalent & Substitute Parts

Part Overview

The LP2981-33DBVRE4 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 100mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides positive fixed output configuration with integrated enable control and comprehensive protection features including over-current, over-temperature, and short-circuit protection.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	3.3V
Output Current	100mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.37V @ 100mA
Quiescent Current	95 µA
PSRR	63dB (1kHz)
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LP2981-33DBVRE4 is determined by the following critical parameters:

Fixed output voltage of 3.3V
Output current capability of 100mA
Maximum input voltage of 16V
Dropout voltage specification of 0.37V @ 100mA
SOT-23-5 package configuration
Operating temperature range of -40°C to 125°C
Enable control feature
Over-current, over-temperature, and short-circuit protection

Substitute parts are grouped into two categories: Texas Instruments LP2981 series variants (parametric equivalents and manufacturer-recommended alternatives) and cross-manufacturer alternatives from STMicroelectronics. All listed substitutes maintain identical electrical specifications and package requirements, with differences limited to product status and packaging format (Cut Tape, Digi-Reel, or Tape & Reel).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	Inventory
LP2981-33DBVRE4	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Obsolete	708 Pcs
LP2981IM5X-3.3/NOPB	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	12302 Pcs
LP2981-33DBVR	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	69150 Pcs
LP2981-33DBVT	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Last Time Buy	4490 Pcs
LP2981A-33DBVR	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	56100 Pcs
LP2981A-33DBVT	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Last Time Buy	1900 Pcs
LP2981A-33DBVTG4	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Discontinued at DiGi Electronics	23637 Pcs
LP2981AIM5-3.3/NOPB	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	4948 Pcs
LP2981AIM5X-3.3/NOPB	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	7272 Pcs
LP2981IM5-3.3/NOPB	Texas Instruments	3.3V	100mA	16V	0.37V @ 100mA	95 µA	SOT-23-5	Active	18400 Pcs
LD2981ABM33TR	STMicroelectronics	3.3V	100mA	16V	0.375V @ 100mA	150 µA	SOT-23-5	Active	24300 Pcs

Engineering Selection Recommendations

For applications requiring an immediate replacement for the obsolete LP2981-33DBVRE4, the following selection criteria apply:

Primary Recommendation: LP2981-33DBVR (Texas Instruments) offers the highest inventory availability (69150 Pcs) with Active product status, ensuring long-term supply continuity and full ROHS3 compliance.

Alternative Selections: LP2981IM5-3.3/NOPB and LP2981AIM5X-3.3/NOPB provide Active status with substantial inventory levels (18400 Pcs and 7272 Pcs respectively) and identical electrical performance.

Cross-Manufacturer Option: LD2981ABM33TR (STMicroelectronics) maintains parametric equivalence with Active status and 24300 Pcs inventory. This part exhibits marginally higher quiescent current (150 µA versus 95 µA) and dropout voltage (0.375V versus 0.37V), which remain within acceptable tolerance for most applications.

Avoid: LP2981-33DBVT and LP2981A-33DBVT carry Last Time Buy status, indicating limited future availability. LP2981A-33DBVTG4 is discontinued at DiGi Electronics and should not be selected for new designs.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can LP2981-33DBVR directly replace LP2981-33DBVRE4 without circuit modification?

A: Yes. Both parts share identical electrical specifications (3.3V output, 100mA current, 0.37V dropout voltage, 95 µA quiescent current) and SOT-23-5 package configuration. Pin-for-pin compatibility is maintained across all control and protection features.

Q: What is the difference between LP2981IM5X-3.3/NOPB and LP2981AIM5X-3.3/NOPB?

A: Both parts deliver identical electrical performance and package specifications. The primary difference is product status: LP2981IM5X-3.3/NOPB is Active with 12302 Pcs inventory, while LP2981AIM5X-3.3/NOPB is Active with 7272 Pcs inventory. Selection should prioritize availability requirements.

Q: Is the STMicroelectronics LD2981ABM33TR suitable as a substitute?

A: Yes, with minor parameter variance. The LD2981ABM33TR maintains 3.3V output, 100mA current, and SOT-23-5 packaging. Quiescent current is 150 µA (versus 95 µA) and dropout voltage is 0.375V (versus 0.37V). These differences are negligible for most applications and do not affect functional compatibility.

Q: What packaging formats are available for LP2981 substitutes?

A: Substitutes are supplied in three formats: Cut Tape (CT), Cut Tape & Digi-Reel (CT & Digi-Reel), and Tape & Reel (TR). Selection depends on assembly volume and handling requirements. All formats maintain identical electrical and mechanical specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitutes, including the cross-manufacturer LD2981ABM33TR, carry ROHS3 Compliant certification and REACH Unaffected status, ensuring regulatory compliance for applications subject to environmental restrictions.

Q: Which substitute offers the best long-term availability?

A: LP2981-33DBVR is the optimal choice for long-term supply assurance, combining Active product status with the highest inventory level (69150 Pcs) among all substitutes.

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