SPX2941T5-L Equivalent & Substitute Parts

Part Overview

The SPX2941T5-L is a linear voltage regulator IC from MaxLinear, Inc., designed for positive adjustable output applications with 1A current capacity in a TO-263-5 surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain compatibility across output configuration, adjustable voltage range, current rating, and thermal management characteristics while accommodating the TO-263 package family.

Key Parameters

Parameter	SPX2941T5-L
Manufacturer	MaxLinear, Inc.
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	16V
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	15.45V
Current - Output	1A
Voltage Dropout (Max)	0.55V @ 1A
Control Features	Enable
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit, Transient Voltage
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the SPX2941T5-L is determined by the following critical parameters:

Output configuration (Positive)
Output type (Adjustable)
Current rating (1A)
Package compatibility (TO-263 family)
Control features (Enable function)
Operating temperature range (-40°C ~ 125°C preferred for full compatibility)

The LM2941 series from Texas Instruments meets these core requirements. All substitute candidates maintain positive adjustable output, 1A current capacity, and TO-263 (DDPAK-5) packaging. Variations in maximum input voltage (26V vs. 16V), output voltage range (5V–20V vs. 1.25V–15.45V), and dropout voltage specifications represent design parameter differences that do not preclude functional substitution when circuit requirements fall within the substitute part's operating envelope.

Parameter Comparison

Parameter	SPX2941T5-L	LM2941CS/NOPB	LM2941CSX/NOPB	LM2941S	LM2941S/NOPB	LM2941SX	LM2941SX/NOPB
Manufacturer	MaxLinear	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Current - Output	1A	1A	1A	1A	1A	1A	1A
Voltage - Input (Max)	16V	26V	26V	26V	26V	26V	26V
Voltage - Output (Min/Fixed)	1.25V	5V	5V	5V	5V	5V	5V
Voltage - Output (Max)	15.45V	20V	20V	20V	20V	20V	20V
Voltage Dropout (Max)	0.55V @ 1A	1V @ 1A	1V @ 1A	1V @ 1A	1V @ 1A	1V @ 1A	1V @ 1A
Operating Temperature	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Last Time Buy	Active	Obsolete	Active

Engineering Selection Recommendations

For new designs and production continuity, LM2941S/NOPB and LM2941SX/NOPB are the preferred substitutes. Both parts maintain Active product status, ensuring long-term availability and supply chain stability. These variants provide extended operating temperature range (-40°C ~ 125°C), matching the SPX2941T5-L specification and supporting applications requiring full industrial temperature performance.

LM2941CSX/NOPB offers the highest inventory availability (81,438 units) with Active status and identical electrical specifications to the S-series variants. The primary consideration is the reduced operating temperature range (0°C ~ 125°C), which limits suitability to commercial temperature applications.

LM2941SX remains available with substantial inventory (88,300 units) but carries Obsolete product status, indicating no further manufacturing or support. This part is suitable only for legacy system maintenance where supply is confirmed.

LM2941S carries Last Time Buy status, signaling end-of-life transition. Inventory availability (2,100 units) is limited, and this part should not be selected for new production programs.

All substitute parts are ROHS3 compliant and maintain the TO-263 (DDPAK-5) package footprint, ensuring PCB layout compatibility with the original SPX2941T5-L design.

Frequently Asked Questions (FAQ)

Q: Can LM2941 series parts directly replace SPX2941T5-L in existing designs?

A: Yes, provided circuit design accommodates the LM2941 output voltage range (5V–20V minimum vs. 1.25V–15.45V for SPX2941T5-L) and the higher dropout voltage specification (1V vs. 0.55V). Pin configuration and package footprint are identical across the TO-263 family.

Q: What is the difference between LM2941S and LM2941SX variants?

A: Both variants share identical electrical specifications and operating temperature range (-40°C ~ 125°C). The primary distinction is packaging format: LM2941S is supplied in Tube packaging, while LM2941SX is supplied in Cut Tape (CT) & Digi-Reel format. The /NOPB suffix indicates lead-free (Pb-free) termination.

Q: Why do LM2941CS/NOPB and LM2941CSX/NOPB specify 0°C ~ 125°C operating temperature?

A: These variants are rated for commercial temperature range only. Applications requiring -40°C minimum operating temperature must use LM2941S/NOPB or LM2941SX/NOPB, which carry the extended industrial temperature specification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All LM2941 series substitutes are ROHS3 compliant, meeting current environmental and regulatory requirements. The original SPX2941T5-L is RoHS Compliant (ROHS1 equivalent).

Q: What inventory status should I prioritize for new production?

A: Select parts with Active product status: LM2941S/NOPB, LM2941SX/NOPB, or LM2941CSX/NOPB. These ensure continued availability and manufacturer support. Avoid Obsolete (LM2941SX) and Last Time Buy (LM2941S without /NOPB suffix) designations for new programs.

Q: Is the TO-263 package footprint identical across all substitute options?

A: Yes. All substitute parts use TO-263-6 D2PAK (5 Leads + Tab) packaging, ensuring direct PCB layout compatibility without redesign.

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