A6276EA LED Driver IC Equivalent & Substitute Parts

Part Overview

The A6276EA is a linear LED driver IC manufactured by Allegro MicroSystems, designed for 16-output shift register applications with 75.5mA per-channel current capability. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The A6276EA operates from 4.5V to 5.5V supply voltage and is packaged in a 24-DIP through-hole configuration. Substitute parts maintain the core 16-output shift register topology while offering improvements in product status, compliance certifications, and packaging options.

Key Parameters

Parameter	A6276EA
Manufacturer	Allegro MicroSystems
Product Status	Obsolete
Type	Linear
Topology	Shift Register
Number of Outputs	16
Voltage - Supply (Min)	4.5V
Voltage - Supply (Max)	5.5V
Voltage - Output	4V
Current - Output / Channel	75.5mA
Frequency	20MHz
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	24-DIP (0.300", 7.62mm)
RoHS Status	RoHS non-compliant
Internal Switch(s)	Yes

Substitute Part Grouping Explanation

Substitution of the A6276EA is determined by the following critical parameters:

Topology: All substitutes maintain 16-output shift register architecture
Internal Switches: All substitutes retain internal switching capability
Supply Voltage Range: Substitutes operate within 3V to 5.5V, encompassing the A6276EA's 4.5V to 5.5V range
Output Current Capability: Substitutes range from 35mA to 120mA per channel, with the A6276EA at 75.5mA
Mounting Type: Substitutes transition from through-hole to surface-mount packages, reflecting modern manufacturing practices
Product Status: All substitutes are active products with current availability
Compliance: Substitutes are RoHS3 compliant, addressing regulatory requirements

The substitute parts are grouped by their electrical compatibility with the A6276EA's core function while offering enhanced product lifecycle status and compliance certifications.

Parameter Comparison

Parameter	A6276EA	MAX6979AUG+	TLC5926IDBQR	TLC5928PW	TLC5928PWP	TLC59291RGER	TLC5945RHBR
Manufacturer	Allegro MicroSystems	Analog Devices Inc./Maxim Integrated	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Type	Linear	Linear	Linear	Linear	Linear	Linear	Linear
Topology	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register
Number of Outputs	16	16	16	16	16	16	16
Voltage - Supply (Min)	4.5V	3V	3V	3V	3V	3V	3V
Voltage - Supply (Max)	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V
Voltage - Output	4V	5.5V	17V	17V	17V	10V	17V
Current - Output / Channel	75.5mA	55mA	120mA	35mA	35mA	50mA	80mA
Frequency	20MHz	—	30MHz	35MHz	35MHz	33MHz	30MHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	24-DIP (0.300", 7.62mm)	24-TSSOP (0.173", 4.40mm Width)	24-SSOP (0.154", 3.90mm Width)	24-TSSOP (0.173", 4.40mm Width)	24-PowerTSSOP (0.173", 4.40mm Width)	24-VFQFN Exposed Pad	32-VFQFN Exposed Pad
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Internal Switch(s)	Yes	Yes	—	Yes	Yes	Yes	Yes
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)	2 (1 Year)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

MAX6979AUG+ is recommended for applications requiring extended operating temperature range (-40°C to 125°C) and unlimited moisture sensitivity. This part is RoHS3 compliant and maintains the 16-output shift register topology with 55mA per-channel capability. Surface-mount 24-TSSOP packaging reduces board footprint compared to the A6276EA's through-hole DIP package.

TLC5926IDBQR is suitable for high-current applications requiring 120mA per-channel output. This Texas Instruments device is RoHS3 compliant and operates across the full 3V to 5.5V supply range. The 24-SSOP surface-mount package offers compact integration. Note that internal switches are not specified for this part.

TLC5928PW and TLC5928PWP are functionally equivalent Texas Instruments alternatives with 35mA per-channel capability and 35MHz frequency operation. Both are RoHS3 compliant and available in surface-mount 24-TSSOP packaging. The TLC5928PWP variant includes PowerTSSOP thermal enhancement. These parts are suitable for lower-current LED driving applications.

TLC59291RGER provides 50mA per-channel output in a compact 24-VFQFN surface-mount package with exposed pad for thermal management. This part is RoHS3 compliant and operates at 33MHz frequency, offering a balance between current capability and package density.

TLC5945RHBR is designed for applications requiring 80mA per-channel output with thermal management. The 32-VFQFN surface-mount package with exposed pad provides enhanced heat dissipation. This part is RoHS3 compliant and specified for backlight applications.

All substitute parts are active products with current manufacturing status and RoHS3 compliance, addressing regulatory and supply chain continuity requirements absent in the obsolete A6276EA.

Frequently Asked Questions (FAQ)

Q: Can the A6276EA be directly replaced with any of these substitutes without circuit modification?

A: Direct replacement depends on application requirements. All substitutes maintain the 16-output shift register topology and internal switching capability. However, differences in output current capability (35mA to 120mA), output voltage ratings (4V to 17V), and package types (through-hole to surface-mount) require circuit evaluation. The A6276EA's 75.5mA per-channel output is most closely matched by TLC5945RHBR (80mA) and TLC5926IDBQR (120mA).

Q: What are the packaging implications of switching from the A6276EA to surface-mount alternatives?

A: The A6276EA uses 24-DIP through-hole packaging (0.300", 7.62mm pitch). All substitutes employ surface-mount packages: 24-TSSOP (0.173" width), 24-SSOP (0.154" width), or 24-VFQFN/32-VFQFN. Surface-mount packages reduce board footprint and enable automated assembly but require PCB redesign and compatible manufacturing processes.

Q: Which substitute is best for new designs requiring RoHS3 compliance?

A: All substitute parts listed are RoHS3 compliant. Selection should be based on specific electrical requirements: MAX6979AUG+ for extended temperature range, TLC5926IDBQR for maximum current capability, TLC5928PW/PWP for lower-current applications, TLC59291RGER for compact packaging, or TLC5945RHBR for thermal management in backlight applications.

Q: How do supply voltage ranges affect substitution?

A: The A6276EA operates from 4.5V to 5.5V. All substitutes operate from 3V to 5.5V, providing broader supply voltage compatibility. Applications using the A6276EA's minimum 4.5V supply will function with any substitute. Applications requiring operation below 4.5V are not compatible with the A6276EA but are compatible with all listed substitutes.

Q: What is the significance of internal switches in the comparison?

A: Internal switches enable the IC to directly drive LED loads without external switching elements. The A6276EA, MAX6979AUG+, TLC5928PW, TLC5928PWP, TLC59291RGER, and TLC5945RHBR all include internal switches. The TLC5926IDBQR does not specify internal switches, requiring external switching circuitry for LED driving applications.

Q: Are there frequency differences that affect circuit design?

A: The A6276EA operates at 20MHz. Substitutes range from 30MHz to 35MHz. Higher frequency operation may reduce EMI in some applications but does not affect basic shift register functionality. Frequency differences do not prevent substitution in standard LED driver applications.

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