A6276SLW-T LED Driver IC Equivalent & Substitute Parts

Part Overview

The A6276SLW-T is a 16-output linear LED driver IC manufactured by Allegro MicroSystems in 24-SOIC packaging. This shift register-based driver delivers 75.5mA per channel output with a 4V output voltage 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 maintain the core 16-output shift register topology while offering variations in output current, voltage ratings, package types, and active product status.

Key Parameters

Parameter	A6276SLW-T
Manufacturer	Allegro MicroSystems
Category	Power Management (PMIC)
Type	Linear
Topology	Shift Register
Number of Outputs	16
Internal Switch(s)	Yes
Voltage - Supply (Min)	4.5V
Voltage - Supply (Max)	5.5V
Voltage - Output	4V
Current - Output / Channel	75.5mA
Frequency	20MHz
Operating Temperature	-20°C ~ 85°C (TA)
Package / Case	24-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the A6276SLW-T is based on the following critical parameters:

Core Functional Requirements:

16 output channels with shift register topology
Linear driver type with internal switching capability
Supply voltage compatibility within 3V to 5.5V range (A6276SLW-T operates 4.5V–5.5V)
Output current per channel (A6276SLW-T: 75.5mA)

Substitution Criteria: Substitute parts must maintain the 16-output shift register architecture and linear topology. Output current ratings may vary (30mA to 90mA range) depending on application requirements. Package types differ across substitutes (24-SOIC, 24-TSSOP, 24-SSOP, 32-VQFN, 24-VQFN), affecting PCB layout compatibility. Supply voltage ranges expand in active substitutes (minimum 3V vs. 4.5V for the original), providing broader operational flexibility. All substitutes maintain ROHS3 compliance and MSL-1 moisture sensitivity ratings.

Parameter Comparison

Parameter	A6276SLW-T	MAX6969AUG+	MAX6979AUG+T	STP16CPPS05XTTR	STP16DPP05XTTR	TC62D749CFNAG	TLC5920DL	TLC5923RHBT	TLC59281DBQR	TLC59283RGET	TLC5928DBQ
Manufacturer	Allegro MicroSystems	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	STMicroelectronics	STMicroelectronics	Toshiba Semiconductor and Storage	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Type	Linear	Linear	Linear	Linear	Linear	Linear	Linear	Linear	Linear	Linear	Linear
Topology	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register
Number of Outputs	16	16	16	16	16	16	16	16	16	16	16
Internal Switch(s)	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes
Voltage - Supply (Min)	4.5V	3V	3V	3V	3V	3V	4.5V	3V	3V	3V	3V
Voltage - Supply (Max)	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V
Voltage - Output	4V	5.5V	5.5V	20V	20V	17V	—	17V	17V	10V	17V
Current - Output / Channel	75.5mA	55mA	55mA	40mA	40mA	90mA	30mA	80mA	35mA	45mA	35mA
Frequency	20MHz	—	—	30MHz	30MHz	—	10MHz	30MHz	35MHz	35MHz	35MHz
Operating Temperature	-20°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-20°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	24-SOIC	24-TSSOP	24-TSSOP	24-TSSOP-EP	24-TSSOP-EP	24-SSOP	48-BSSOP	32-VFQFN	24-SSOP	24-VFQFN	24-SSOP
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

All substitute parts listed are active products with current manufacturing status, ensuring long-term availability and supply chain stability. All substitutes maintain ROHS3 compliance or equivalent RoHS certification, meeting environmental and regulatory requirements.

For applications requiring closest current output matching: TC62D749CFNAG (90mA) and TLC5923RHBT (80mA) provide output current ratings nearest to the A6276SLW-T (75.5mA). Both are active products with extended temperature ranges (-40°C to 85°C).

For applications with expanded supply voltage requirements: MAX6969AUG+, MAX6979AUG+T, STP16CPPS05XTTR, STP16DPP05XTTR, and all Texas Instruments options support 3V minimum supply, enabling operation in lower-voltage systems compared to the original 4.5V minimum.

For package compatibility: Direct 24-pin package substitutes include MAX6969AUG+ and MAX6979AUG+T (24-TSSOP), TC62D749CFNAG and TLC59281DBQR (24-SSOP), and TLC5928DBQ (24-SSOP). These minimize PCB layout redesign. The TLC5920DL operates in 48-BSSOP, requiring significant layout changes. The TLC5923RHBT (32-VQFN) and TLC59283RGET (24-VQFN) offer compact footprints for space-constrained applications.

For temperature range: MAX6969AUG+, MAX6979AUG+T, STP16CPPS05XTTR, and STP16DPP05XTTR extend operation to -40°C to 125°C, suitable for industrial and automotive environments.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the A6276SLW-T with any of these substitutes without PCB modification?

A: Direct replacement without PCB modification is limited to parts sharing the same package footprint. The A6276SLW-T uses 24-SOIC packaging. Closest mechanical alternatives in 24-pin packages are MAX6969AUG+ and MAX6979AUG+T (24-TSSOP), TC62D749CFNAG and TLC59281DBQR (24-SSOP), and TLC5928DBQ (24-SSOP). Pin-to-pin compatibility must be verified against device datasheets before implementation.

Q: What is the key difference in output current between the A6276SLW-T and substitute options?

A: The A6276SLW-T delivers 75.5mA per channel. Substitutes range from 30mA (TLC5920DL) to 90mA (TC62D749CFNAG). Lower current options (30–45mA) suit applications with reduced LED brightness or lower power budgets. Higher current options (80–90mA) support brighter LED arrays or higher-impedance loads.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitutes are either ROHS3 Compliant or RoHS Compliant, meeting environmental and regulatory standards equivalent to the original A6276SLW-T.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: The A6276SLW-T carries MSL-1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. Most substitutes (MAX6969AUG+, MAX6979AUG+T, STP16CPPS05XTTR, STP16DPP05XTTR) also feature MSL-1. Texas Instruments options carry MSL-2 (1 Year), requiring controlled storage conditions and baking before reflow soldering if shelf life exceeds one year.

Q: Which substitute offers the broadest supply voltage range?

A: All active substitutes support 3V to 5.5V supply range, except the TLC5920DL, which maintains the original 4.5V to 5.5V range. The expanded 3V minimum enables operation in lower-voltage systems and provides greater design flexibility.

Q: Can I use a substitute with lower output current if my application allows?

A: Yes, if your LED load impedance and brightness requirements permit. Lower current options (30–45mA) reduce power dissipation and heat generation. Verify that the substitute's output voltage rating is compatible with your LED forward voltage specifications.

Q: What package considerations should I evaluate for substitution?

A: Package selection impacts PCB layout, thermal management, and assembly compatibility. SOIC and SSOP packages offer standard through-hole compatibility. TSSOP packages provide smaller footprints. VQFN packages (32-VQFN, 24-VQFN) offer the most compact form factors with exposed pads for enhanced thermal performance. Confirm your assembly equipment supports the selected package type.

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