SPX2815AT-L Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The SPX2815AT-L is a linear voltage regulator IC manufactured by MaxLinear, Inc., designed for positive adjustable output applications with 1.5A current capacity in a TO-263-3 surface mount package. This device is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and production continuity. The SPX2815AT-L operates across an input voltage range of up to 10V with adjustable output from 1.25V to 15V, featuring integrated over-current and over-temperature protection suitable for general-purpose power management applications.

Key Parameters

Parameter	SPX2815AT-L
Manufacturer	MaxLinear, Inc.
Output Configuration	Positive Adjustable
Output Current	1.5A
Input Voltage (Max)	10V
Output Voltage Range	1.25V to 15V
Dropout Voltage (Max)	1.2V @ 1.5A
PSRR	75dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	-40°C to 125°C
Package	TO-263-3 (D2PAK)
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the SPX2815AT-L are selected based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Output configuration: Positive adjustable
Output current rating: 1.5A minimum
Package type: TO-263 (D2PAK) surface mount
Output voltage range: Minimum 1.25V adjustable output
Protection features: Over-current and over-temperature protection
Operating temperature range: Support for -40°C to 125°C or compatible subset

Secondary Compatibility Factors:

Input voltage rating: Must support minimum 10V input (higher ratings acceptable)
Dropout voltage: Maximum 1.5V @ 1.5A (SPX2815AT-L specifies 1.2V)
PSRR: 75dB or higher at 120Hz
RoHS and REACH compliance status

All listed substitutes meet or exceed the core electrical specifications of the SPX2815AT-L while maintaining identical package footprint and pinout compatibility.

Parameter Comparison

Part Number	Manufacturer	Input Voltage (Max)	Output Voltage Range	Output Current	Dropout Voltage @ 1.5A	PSRR (120Hz)	Operating Temp	Package	Product Status
SPX2815AT-L	MaxLinear, Inc.	10V	1.25V to 15V	1.5A	1.2V	75dB	-40°C to 125°C	TO-263-3	Discontinued
LD1086D2MTR	STMicroelectronics	30V	1.25V to 28.5V	1.5A	1.5V	88dB	-40°C to 125°C	D2PAK	Active
LM1086CS-ADJ	Texas Instruments	29V	1.2V to 15V	1.5A	1.5V	75dB	0°C to 125°C	TO-263	Last Time Buy
LM1086CS-ADJ/NOPB	Texas Instruments	29V	1.2V to 15V	1.5A	1.5V	75dB	0°C to 125°C	TO-263	Active
LM1086CSX-ADJ/NOPB	Texas Instruments	29V	1.2V to 15V	1.5A	1.5V	75dB	0°C to 125°C	TO-263	Active
LM1086IS-ADJ/NOPB	Texas Instruments	29V	1.2V to 15V	1.5A	1.5V	75dB	-40°C to 125°C	TO-263	Active
LM1086ISX-ADJ/NOPB	Texas Instruments	29V	1.2V to 15V	1.5A	1.5V	75dB	-40°C to 125°C	TO-263	Active
LT1086CM#PBF	Analog Devices Inc.	25V	1.25V to 24.6V	1.5A	1.5V	75dB	0°C to 125°C	DDPAK-3	Active
LT1086CM#TRPBF	Analog Devices Inc.	25V	1.25V to 24.6V	1.5A	1.5V	75dB	0°C to 125°C	DDPAK-3	Active
LT1086IM#PBF	Analog Devices Inc.	25V	1.25V to 24.6V	1.5A	1.5V	75dB	-40°C to 125°C	DDPAK-3	Active
LT1086IM#TRPBF	Analog Devices Inc.	25V	1.25V to 24.6V	1.5A	1.5V	75dB	-40°C to 125°C	DDPAK-3	Active

Engineering Selection Recommendations

Primary Recommendation: LM1086IS-ADJ/NOPB or LM1086ISX-ADJ/NOPB

These Texas Instruments parts provide the closest functional match to the SPX2815AT-L. Both maintain the full -40°C to 125°C operating temperature range, identical 1.5A output current, and equivalent PSRR performance. The LM1086ISX-ADJ/NOPB variant offers higher inventory availability (16,157 units) in cut tape packaging, supporting high-volume production requirements. Both parts carry ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.

Secondary Recommendation: LT1086IM#TRPBF or LT1086IM#PBF

Analog Devices LT1086 variants maintain full -40°C to 125°C temperature range compatibility and deliver superior PSRR performance (75dB). These parts support input voltages up to 25V and output adjustment to 24.6V, providing extended operating margins. MSL rating of 1 (unlimited moisture sensitivity) offers superior handling characteristics compared to the SPX2815AT-L's MSL-3 rating. Tape & reel packaging (LT1086IM#TRPBF) supports automated assembly workflows.

Alternative: LD1086D2MTR

The STMicroelectronics LD1086D2MTR offers the highest input voltage rating (30V) and superior PSRR (88dB), with MSL-1 moisture sensitivity. This part is suitable for applications requiring extended input voltage headroom. Product status is active with 2,488 units in stock.

Not Recommended: LM1086CS-ADJ

This part carries "Last Time Buy" status, indicating discontinued production. While functionally compatible, it does not provide long-term supply security.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SPX2815AT-L with any of these substitutes without PCB modification?

A: Yes. All listed substitutes use identical TO-263 (D2PAK) package footprints with matching pinout configurations. No PCB layout changes are required for mechanical or electrical compatibility.

Q: What is the difference between LM1086CS-ADJ and LM1086CS-ADJ/NOPB?

A: The "/NOPB" suffix indicates lead-free (no-lead) plating, meeting RoHS requirements. Both parts are electrically identical. The /NOPB variant is preferred for new designs to ensure regulatory compliance.

Q: Why do some substitutes have higher input voltage ratings than the SPX2815AT-L?

A: Higher input voltage ratings (25V to 30V) provide design flexibility for applications with variable input sources. These parts remain fully functional at the SPX2815AT-L's 10V maximum input specification. The higher rating does not affect performance at lower voltages.

Q: What does the "X" suffix mean in LM1086CSX-ADJ/NOPB and LM1086ISX-ADJ/NOPB?

A: The "X" suffix indicates cut tape and Digi-Reel packaging, optimized for automated pick-and-place assembly. Parts without the "X" suffix are supplied in tube packaging for manual handling.

Q: Are there temperature range differences I should consider?

A: Yes. The SPX2815AT-L and most recommended substitutes operate from -40°C to 125°C. The LM1086CS-ADJ and LM1086CSX-ADJ/NOPB variants operate from 0°C to 125°C, limiting use in applications requiring sub-zero temperature performance. For full temperature range compatibility, select LM1086IS-ADJ/NOPB, LM1086ISX-ADJ/NOPB, or Analog Devices LT1086 variants.

Q: What is MSL (Moisture Sensitivity Level) and why does it matter?

A: MSL indicates how long a component can be stored in ambient conditions before requiring baking before reflow soldering. SPX2815AT-L has MSL-3 (168 hours). Substitutes with MSL-1 (unlimited) offer superior shelf life and reduced handling risk during manufacturing. This is particularly important for long-term inventory management.

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

A: LM1086ISX-ADJ/NOPB (Texas Instruments) with 16,157 units in stock and active product status provides the strongest supply position. LT1086IM#TRPBF (Analog Devices) with 2,749 units also maintains active status with established market presence.

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