A6275ELW LED Driver IC Equivalent & Substitute Parts

Part Overview

The A6275ELW is a linear LED driver IC manufactured by Allegro MicroSystems, designed for 8-output shift register applications with 75.5mA per-channel output capability. This device operates within a 4.5V to 5.5V supply range and is packaged in a 16-SOIC surface mount configuration. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

A6275ELW

Allegro MicroSystemsIn Stock: 29599A6275ELW Datasheet

Current PartRFQ

MAX6970AAE+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1149MAX6970AAE+T Datasheet

MFR RecommendedRFQ

STP08DP05TTR

STMicroelectronicsIn Stock: 2261STP08DP05TTR Datasheet

MFR RecommendedRFQ

TB62785NG

Toshiba Semiconductor and StorageIn Stock: 826TB62785NG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the A6275ELW is determined by the following core parameters:

Mandatory Compatibility Criteria:

• Topology: Shift Register
• Number of Outputs: 8
• Type: Linear
• Internal Switch(s): Yes
• Mounting Type: Surface Mount

Electrical Operating Range:

• Supply voltage overlap with 4.5V–5.5V range
• Output current capability at or above 75.5mA per channel
• Operating temperature range covering -40°C to 85°C minimum

Allowed Variations:

• Package type may differ (SOIC, SSOP, TSSOP, SDIP)
• Output voltage rating may exceed 4V
• Frequency may differ if not specified as critical
• RoHS compliance status may differ
• Product status may be Active (preferred over Obsolete)

The three substitute parts listed below meet these criteria through different trade-offs in packaging, current rating, and compliance status.

Parameter Comparison

Engineering Selection Recommendations

MAX6970AAE+T (Analog Devices Inc./Maxim Integrated)

This part is active and ROHS3 compliant. It operates across an extended supply voltage range (3V–5.5V) and supports higher output voltage (36V). However, the per-channel current output is 55mA, which is below the A6275ELW specification of 75.5mA. This part is suitable for applications where lower per-channel current is acceptable and extended temperature range (-40°C to 125°C) is beneficial. Packaging is 16-SSOP surface mount.

STP08DP05TTR (STMicroelectronics)

This part is active and ROHS3 compliant with the highest per-channel current rating (100mA), exceeding the A6275ELW requirement. It operates at 30MHz frequency and supports output voltage to 20V. The operating temperature range extends to 125°C. Moisture sensitivity is MSL 3 (168 hours), requiring controlled storage conditions. Packaging is 16-TSSOP surface mount, the smallest footprint of the three substitutes.

TB62785NG (Toshiba Semiconductor and Storage)

This part is active and ROHS3 compliant with supply voltage range matching the A6275ELW (4.5V–5.5V) and identical operating temperature range (-40°C to 85°C). However, per-channel current is 50mA, below the A6275ELW specification. Moisture sensitivity is MSL 1 (unlimited). The critical difference is mounting type: this part uses through-hole 24-SDIP packaging, requiring PCB redesign if surface mount is required.

Frequently Asked Questions (FAQ)

Q: Can MAX6970AAE+T replace A6275ELW in all applications?

A: MAX6970AAE+T meets the core functional requirements (8-output shift register, linear topology, surface mount) but delivers 55mA per channel versus 75.5mA. Substitution is valid only if the application circuit can operate with reduced per-channel current. The extended temperature range (-40°C to 125°C) and lower minimum supply voltage (3V) are additional benefits.

Q: Why does STP08DP05TTR have higher current output than the original part?

A: STP08DP05TTR is rated for 100mA per channel, exceeding the A6275ELW specification of 75.5mA. This higher rating does not prevent substitution; it indicates the device can deliver the required current with additional margin. The smaller TSSOP package and higher frequency (30MHz) are design improvements in this generation.

Q: Is TB62785NG suitable for new PCB designs?

A: TB62785NG is functionally compatible but uses through-hole 24-SDIP packaging instead of surface mount. New designs requiring surface mount technology should select MAX6970AAE+T or STP08DP05TTR. Existing through-hole designs can use TB62785NG without PCB modification.

Q: What is the impact of MSL 3 rating on STP08DP05TTR?

A: MSL 3 (168 hours) requires controlled storage and handling. The component must be used within 168 hours of opening the moisture barrier bag at 30°C/60% relative humidity. This is more restrictive than MSL 1 (unlimited) but manageable with standard manufacturing practices. MAX6970AAE+T and TB62785NG have MSL 1 and do not require special moisture control.

Q: Can I use these substitutes interchangeably on the same PCB?

A: No. Package differences (SOIC, SSOP, TSSOP, SDIP) require different PCB footprints. Select one substitute based on your PCB design constraints and performance requirements. Mixing different packages on the same board requires separate PCB layouts.

Q: Which substitute is recommended for RoHS-compliant designs?

A: All three substitutes (MAX6970AAE+T, STP08DP05TTR, TB62785NG) are ROHS3 compliant. The original A6275ELW is RoHS non-compliant. Any of the three substitutes satisfy RoHS compliance requirements.