A6277SLW LED Driver IC Equivalent & Substitute Parts

Part Overview

The A6277SLW is an 8-output linear LED driver IC manufactured by Allegro MicroSystems, packaged in 20-SOIC format with 150mA per-channel output capability. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The shift register topology with internal switching enables direct LED array control in lighting and signage applications.

Key Parameters

Parameter	A6277SLW
Manufacturer	Allegro MicroSystems
Category	Power Management (PMIC)
Type	Linear LED Driver
Topology	Shift Register
Number of Outputs	8
Current per Channel	150mA
Supply Voltage Range	4.5V to 5.5V
Output Voltage	4V
Operating Temperature	-40°C to 85°C
Package	20-SOIC
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the A6277SLW is determined by the following mandatory parameters:

Topology: Shift register architecture with 8 outputs (required for pin-compatible or functional equivalence)
Output Configuration: 8-channel linear driver with internal switching capability
Supply Voltage Compatibility: Minimum 4.5V operation to support the original 4.5V–5.5V range
Current Capability: Minimum 120mA per channel to meet or exceed the 150mA specification
Package Compatibility: Surface mount or through-hole packages acceptable for redesign scenarios
Product Status: Active status preferred for long-term availability

The three substitute parts listed below meet these core criteria while offering improved compliance and extended temperature ranges.

Parameter Comparison

Parameter	A6277SLW	TLC5916IDR	STP08DP05XTTR	MAX6968APE+
Manufacturer	Allegro MicroSystems	Texas Instruments	STMicroelectronics	Analog Devices Inc./Maxim
Type	Linear LED Driver	Linear LED Driver	Linear LED Driver	Linear LED Driver
Topology	Shift Register	Shift Register	Shift Register	Shift Register
Number of Outputs	8	8	8	8
Current per Channel	150mA	120mA	100mA	55mA
Supply Voltage (Min)	4.5V	3V	3V	3V
Supply Voltage (Max)	5.5V	5.5V	5.5V	5.5V
Output Voltage	4V	20V	20V	5.5V
Operating Temperature	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package	20-SOIC	16-SOIC	16-HTSSOP	16-DIP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Through Hole
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

TLC5916IDR (Texas Instruments) is the primary substitute for direct functional replacement. It maintains surface-mount form factor compatibility with 16-SOIC packaging, delivers 120mA per-channel output (80% of original specification), and operates across the full 3V–5.5V supply range. Active product status ensures long-term availability. ROHS3 compliance and unlimited MSL rating support modern manufacturing environments.

STP08DP05XTTR (STMicroelectronics) provides an alternative with 100mA per-channel capability in a compact 16-HTSSOP package. Higher output voltage rating (20V) accommodates extended LED string configurations. Active status and ROHS3 compliance are confirmed. MSL-3 rating requires controlled moisture handling during storage and assembly.

MAX6968APE+ (Analog Devices Inc./Maxim Integrated) offers through-hole 16-DIP packaging for legacy board designs or prototyping applications. Output current is limited to 55mA per channel, suitable only for low-power LED applications. Active product status and ROHS3 compliance are maintained. This option is recommended only when surface-mount redesign is not feasible.

All three substitutes provide 8-output shift register architecture with internal switching, meeting the core functional requirements of the obsolete A6277SLW.

Frequently Asked Questions (FAQ)

Q: Can TLC5916IDR directly replace A6277SLW in existing PCB layouts?

A: No. TLC5916IDR uses 16-SOIC packaging versus the original 20-SOIC, requiring PCB redesign. Pin count and signal routing differ. Functional equivalence is confirmed; physical substitution without layout modification is not possible.

Q: What is the impact of reduced current output in substitute parts?

A: TLC5916IDR delivers 120mA per channel (80% of A6277SLW specification). STP08DP05XTTR delivers 100mA per channel (67% of specification). MAX6968APE+ delivers 55mA per channel (37% of specification). Current derating affects maximum LED brightness and string length. Verify LED forward current requirements against selected substitute before implementation.

Q: Are all substitutes RoHS compliant?

A: Yes. TLC5916IDR, STP08DP05XTTR, and MAX6968APE+ are all ROHS3 compliant. The original A6277SLW is RoHS non-compliant, making substitution necessary for regulatory compliance in new designs.

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

A: All three substitutes carry active product status. TLC5916IDR and MAX6968APE+ have unlimited MSL ratings (1), supporting indefinite storage. STP08DP05XTTR has MSL-3 rating, requiring controlled moisture exposure (168-hour limit after bag opening).

Q: Can MAX6968APE+ be used in surface-mount applications?

A: No. MAX6968APE+ is through-hole only (16-DIP package). It is suitable for prototype boards or legacy designs requiring DIP packaging. For surface-mount production, select TLC5916IDR or STP08DP05XTTR.

Q: What is the temperature operating range difference?

A: A6277SLW operates -40°C to 85°C. All substitutes extend to -40°C to 125°C, providing 40°C additional headroom for high-temperature applications.

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