A6276ELP LED Driver IC Equivalent & Substitute Parts

Part Overview

The A6276ELP is a 16-output linear LED driver IC manufactured by Allegro MicroSystems in 24-TSSOP packaging with exposed pad. This shift register-based driver delivers 75.5mA per channel output and operates across a 4.5V to 5.5V supply range. The device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. Substitute parts must maintain the 16-output configuration, shift register topology, and compatible electrical characteristics within the specified operating parameters.

Key Parameters

Parameter	A6276ELP Value
Manufacturer	Allegro MicroSystems
Category	Power Management (PMIC)
Type	Linear
Topology	Shift Register
Number of Outputs	16
Voltage Supply (Min)	4.5V
Voltage Supply (Max)	5.5V
Current Output per Channel	75.5mA
Voltage Output	4V
Frequency	20MHz
Operating Temperature	-40°C to 85°C
Mounting Type	Surface Mount
Package	24-TSSOP with Exposed Pad
Product Status	Obsolete
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution logic for the A6276ELP is based on the following critical parameters: 16-output configuration, linear shift register topology, internal switching capability, and compatible supply voltage range. Substitute parts are grouped into two categories based on electrical compatibility:

Category 1: Direct Shift Register Substitutes (Preferred) Parts maintaining shift register topology with 16 outputs and compatible supply voltage (3V–5.5V minimum range). These include STP16CP05TTR, STP16CPS05TTR, TLC5924DAPR, TLC59281DBQR, and TLC59282RGET. These devices preserve the original shift register control interface and dimming architecture.

Category 2: Alternative Control Architecture Substitutes Parts with 16 outputs but different control methods (I2C or PWM) or modified electrical specifications. These include MAX6979AUG+T, PCA9532PW,118, PCA9685PW,118, TB62747AFNG,C8EL, and TLC5920DL. These require design modifications to accommodate different control interfaces or package footprints.

Parameter Comparison

Part Number	Manufacturer	Type	Topology	Outputs	Supply Min (V)	Supply Max (V)	Current/Channel (mA)	Output Voltage (V)	Frequency	Package	Status	RoHS
A6276ELP	Allegro MicroSystems	Linear	Shift Register	16	4.5	5.5	75.5	4	20MHz	24-TSSOP-EP	Obsolete	Non-Compliant
MAX6979AUG+T	Analog Devices/Maxim	Linear	Shift Register	16	3	5.5	55	5.5	—	24-TSSOP	Active	ROHS3 Compliant
STP16CP05TTR	STMicroelectronics	Linear	Shift Register	16	3	5.5	100	20	30MHz	24-TSSOP	Active	ROHS3 Compliant
STP16CPS05TTR	STMicroelectronics	Linear	Shift Register	16	3	5.5	100	20	30MHz	24-TSSOP	Active	ROHS3 Compliant
TB62747AFNG,C8EL	Toshiba Semiconductor	Linear	Shift Register	16	3	5.5	45	26	—	24-LSSOP	Active	ROHS3 Compliant
TLC5920DL	Texas Instruments	Linear	Shift Register	16	4.5	5.5	30	—	10MHz	48-BSSOP	Active	ROHS3 Compliant
TLC5924DAPR	Texas Instruments	Linear	Shift Register	16	3	5.5	80	15	30MHz	32-HTSSOP	Active	ROHS3 Compliant
TLC59281DBQR	Texas Instruments	Linear	Shift Register	16	3	5.5	35	17	35MHz	24-SSOP	Active	ROHS3 Compliant
TLC59282RGET	Texas Instruments	Linear	Shift Register	16	3	5.5	45	17	35MHz	24-VQFN	Active	ROHS3 Compliant
PCA9532PW,118	NXP USA Inc.	Power Switch	—	16	2.3	5.5	25	—	—	24-TSSOP	Active	ROHS3 Compliant
PCA9685PW,118	NXP USA Inc.	Linear	—	16	2.3	5.5	25	5.5	100kHz–1MHz	28-TSSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Shift Register Topology Preserved):

STP16CP05TTR and STP16CPS05TTR from STMicroelectronics are the closest functional equivalents. Both maintain 16-output shift register architecture, operate within the 3V–5.5V supply range, and are ROHS3 compliant with active product status. Output current capability (100mA per channel) exceeds the A6276ELP specification, providing design margin. Package footprint is identical (24-TSSOP), enabling direct PCB substitution. Operating temperature range extends to 125°C, improving thermal performance over the original device.

TLC5924DAPR from Texas Instruments offers 80mA per channel output current in a 32-HTSSOP package with shift register topology and ROHS3 compliance. This part requires PCB layout modification due to different package geometry but maintains full functional compatibility.

For Supply Voltage Flexibility:

MAX6979AUG+T from Analog Devices/Maxim Integrated supports a lower minimum supply voltage (3V) while maintaining the 5.5V maximum, enabling operation in broader power supply scenarios. The 24-TSSOP package matches the original footprint. Output current (55mA per channel) is lower than the A6276ELP but sufficient for many LED driver applications. Active product status and ROHS3 compliance ensure long-term availability.

For Lower Current Applications:

TLC59281DBQR from Texas Instruments delivers 35mA per channel in a compact 24-SSOP package with 35MHz frequency capability. This part is suitable for applications where the A6276ELP's 75.5mA output exceeds requirements, reducing power dissipation and thermal management complexity.

For Alternative Control Interfaces (Design Modification Required):

PCA9532PW,118 from NXP USA Inc. provides I2C-based dimming control with 16 outputs and 25mA per channel. This substitution requires firmware modification to accommodate I2C communication protocol instead of shift register serial input.

PCA9685PW,118 from NXP USA Inc. offers PWM-based dimming with 16 outputs and 25mA per channel. This part requires design changes to implement PWM control logic.

All recommended substitutes carry ROHS3 compliance and active product status, ensuring regulatory alignment and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can STP16CP05TTR directly replace A6276ELP without PCB modification?

A: Yes. Both devices use 24-TSSOP packaging with identical pin assignments and shift register control architecture. The STP16CP05TTR operates within compatible supply voltage ranges (3V–5.5V) and provides higher output current capability (100mA vs. 75.5mA per channel). No firmware changes are required.

Q: What is the key difference between shift register and I2C control substitutes?

A: Shift register devices (STP16CP05TTR, TLC5924DAPR, TLC59282RGET) accept serial data input and require clock and latch signals for operation. I2C devices (PCA9532PW,118) use a two-wire communication protocol requiring microcontroller I2C interface support. Substituting between these architectures requires firmware redesign.

Q: Why does TLC5920DL have a different package (48-BSSOP) than the A6276ELP (24-TSSOP)?

A: TLC5920DL uses a larger 48-pin package to accommodate additional internal circuitry and thermal management features. This substitution requires complete PCB redesign and is recommended only when the 24-pin alternatives are unavailable.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts carry ROHS3 compliance status. The original A6276ELP is RoHS non-compliant. Substitution with ROHS3-compliant parts ensures regulatory alignment for new designs and updated production runs.

Q: Which substitute offers the closest electrical match to A6276ELP?

A: STP16CP05TTR and STP16CPS05TTR provide the closest match: identical 24-TSSOP package, shift register topology, 16-output configuration, and compatible supply voltage range. Output current (100mA) exceeds the original specification, providing design margin for LED brightness control applications.

Q: Can I use TLC59282RGET as a drop-in replacement?

A: TLC59282RGET maintains shift register topology and 16-output configuration but uses 24-VQFN packaging instead of 24-TSSOP. PCB layout modification is required. The device is electrically compatible and offers 45mA per channel output current with 35MHz frequency capability.

Q: What is the operating temperature range difference between A6276ELP and recommended substitutes?

A: A6276ELP operates from -40°C to 85°C. STP16CP05TTR and STP16CPS05TTR extend the upper limit to 125°C, improving thermal performance in high-temperature environments. TLC5920DL operates from -20°C to 85°C, with a narrower lower temperature range.

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