A6277SA LED Driver IC Equivalent & Substitute Parts

Part Overview

The A6277SA is an 8-output linear LED driver IC manufactured by Allegro MicroSystems, designed for shift register-based dimming applications. This device operates with internal switching capability and supports 150mA per output channel. The A6277SA is classified as obsolete, making identification of functionally equivalent active alternatives essential for new designs and production continuity.

Substiute Parts

A6277SA

Allegro MicroSystemsIn Stock: 931A6277SA Datasheet

Current PartRFQ

MAX6970AUE+T

Analog Devices Inc./Maxim IntegratedIn Stock: 736MAX6970AUE+T Datasheet

MFR RecommendedRFQ

TB62785NG

Toshiba Semiconductor and StorageIn Stock: 826TB62785NG Datasheet

MFR RecommendedRFQ

TLC5917IPW

Texas InstrumentsIn Stock: 3715TLC5917IPW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A6277SA is determined by the following critical parameters:

• Output Configuration: 8-output shift register topology with internal switching
• Supply Voltage Range: 4.5V to 5.5V nominal operation
• Output Current Capability: Per-channel current rating
• Package Type: Through-hole or surface-mount compatibility
• Product Status: Active alternatives required for ongoing production

Three active substitute parts meet the core functional requirements of the A6277SA while offering improvements in product status and compliance:

1. MAX6970AUE+T (Analog Devices Inc./Maxim Integrated) – Surface-mount alternative with extended temperature range and ROHS3 compliance
2. TB62785NG (Toshiba Semiconductor and Storage) – Through-hole alternative maintaining similar supply voltage specifications
3. TLC5917IPW (Texas Instruments) – Surface-mount alternative with extended temperature range and higher frequency capability

Parameter Comparison

Engineering Selection Recommendations

For Through-Hole PCB Designs: TB62785NG is the primary substitute for through-hole applications. It maintains the same supply voltage range (4.5V–5.5V) and operating temperature specification (-40°C ~ 85°C) as the A6277SA. The 24-SDIP package accommodates through-hole mounting. Output current per channel is 50mA, which is lower than the A6277SA's 150mA rating. TB62785NG holds active product status and ROHS3 compliance.

For Surface-Mount PCB Designs: TLC5917IPW is recommended for new surface-mount designs. It provides 120mA per-channel output current, closer to the A6277SA specification than MAX6970AUE+T. The 16-TSSOP package reduces board footprint. TLC5917IPW operates across 3V–5.5V supply range and -40°C ~ 125°C temperature range, offering extended thermal capability. Active product status and ROHS3 compliance are confirmed.

For Extended Temperature Applications: Both MAX6970AUE+T and TLC5917IPW support -40°C ~ 125°C operating range, exceeding the A6277SA's -40°C ~ 85°C specification. Selection between these depends on mounting type and output current requirements.

Compliance Considerations: All three substitute parts are ROHS3 compliant, addressing the A6277SA's RoHS non-compliant status. All three maintain MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can MAX6970AUE+T directly replace A6277SA in existing through-hole designs? A: No. MAX6970AUE+T uses 16-TSSOP surface-mount packaging, incompatible with through-hole PCB layouts designed for 20-DIP. TB62785NG is the appropriate through-hole substitute.

Q: What is the impact of lower output current in substitute parts? A: MAX6970AUE+T provides 55mA and TB62785NG provides 50mA per channel, compared to A6277SA's 150mA. Applications requiring full 150mA per output must use TLC5917IPW (120mA) or redesign current distribution. Verify load requirements before substitution.

Q: Are all substitute parts RoHS compliant? A: Yes. MAX6970AUE+T, TB62785NG, and TLC5917IPW all hold ROHS3 compliance status, addressing the A6277SA's RoHS non-compliant classification.

Q: Which substitute supports the widest supply voltage range? A: MAX6970AUE+T and TLC5917IPW both operate from 3V minimum supply, compared to A6277SA's 4.5V minimum. This provides greater design flexibility for lower-voltage applications.

Q: Is package footprint a critical consideration? A: Yes. Through-hole designs require TB62785NG (24-SDIP). Surface-mount designs can use MAX6970AUE+T or TLC5917IPW (both 16-TSSOP). PCB layout compatibility is mandatory before substitution.

Q: What is the temperature operating range difference? A: A6277SA operates -40°C ~ 85°C. MAX6970AUE+T and TLC5917IPW extend to -40°C ~ 125°C. TB62785NG matches the original -40°C ~ 85°C range. Select based on thermal environment requirements.

Q: Can multiple substitute parts be used interchangeably in the same design? A: No. Each substitute has distinct electrical characteristics (output voltage, current per channel, frequency) and package types. Select one substitute based on mounting type and electrical requirements, then maintain consistency across production.