A6276SA LED Driver IC Equivalent & Substitute Parts

Part Overview

The A6276SA is a linear LED driver IC manufactured by Allegro MicroSystems, designed for 16-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 24-DIP through-hole configuration. The A6276SA is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. Substitute parts maintain the core functionality of 16-output linear shift register LED driving while offering improved product status, enhanced compliance certifications, and alternative packaging options suitable for modern manufacturing processes.

Key Parameters

Parameter	A6276SA
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	-20°C ~ 85°C
Mounting Type	Through Hole
Package / Case	24-DIP (0.300", 7.62mm)
RoHS Status	RoHS non-compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the A6276SA is determined by the following critical parameters:

Core Functionality: All substitute parts maintain 16-output linear shift register topology with internal switching capability
Supply Voltage Compatibility: Substitute parts must operate within or encompass the 4.5V to 5.5V supply range of the original device
Output Current Capability: Substitute parts range from 35mA to 100mA per channel, accommodating various LED driving requirements
Frequency Performance: Substitute parts operate at 15MHz to 35MHz, supporting the 20MHz baseline of the A6276SA
Operating Temperature Range: Substitute parts support -20°C to 85°C minimum, with several extending to -40°C to 125°C
Packaging: Substitute parts transition from through-hole to surface-mount technologies (TSSOP, SSOP, HTQFP, VQFN, LSSOP), reflecting modern PCB assembly standards
Compliance Status: All substitute parts are RoHS3 compliant and carry active product status, ensuring long-term availability and regulatory alignment

Parameter Comparison

Part Number	Manufacturer	Product Status	Type	Outputs	Supply Min (V)	Supply Max (V)	Output Voltage (V)	Current/Channel (mA)	Frequency (MHz)	Temp Range (°C)	Package	Mounting	RoHS
A6276SA	Allegro MicroSystems	Obsolete	Linear	16	4.5	5.5	4	75.5	20	-20 ~ 85	24-DIP	Through Hole	Non-compliant
STP16CPS05TTR	STMicroelectronics	Active	Linear	16	3	5.5	20	100	30	-40 ~ 125	24-TSSOP	Surface Mount	ROHS3
TB62747AFNG,C8EL	Toshiba Semiconductor and Storage	Active	Linear	16	3	5.5	26	45	—	-40 ~ 85	24-LSSOP	Surface Mount	ROHS3
TLC59025IDBQR	Texas Instruments	Active	Linear	16	3	5.5	17	45	30	-40 ~ 85	24-SSOP	Surface Mount	ROHS3
TLC5904PZP	Texas Instruments	Active	Linear	16	4.5	5.5	17	80, 120	15	-20 ~ 85	100-HTQFP	Surface Mount	ROHS3
TLC5921DAPR	Texas Instruments	Active	Linear	16	4.5	5.5	17	80	20	-20 ~ 85	32-HTSSOP	Surface Mount	ROHS3
TLC5923DAPR	Texas Instruments	Active	Linear	16	3	5.5	17	80	30	-40 ~ 85	32-HTSSOP	Surface Mount	ROHS3
TLC5924DAPR	Texas Instruments	Active	Linear	16	3	5.5	15	80	30	-40 ~ 85	32-HTSSOP	Surface Mount	ROHS3
TLC59281DBQR	Texas Instruments	Active	Linear	16	3	5.5	17	35	35	-40 ~ 85	24-SSOP	Surface Mount	ROHS3
TLC59282RGET	Texas Instruments	Active	Linear	16	3	5.5	17	45	35	-40 ~ 85	24-VQFN	Surface Mount	ROHS3
TLC59283RGET	Texas Instruments	Active	Linear	16	3	5.5	10	45	35	-40 ~ 85	24-VQFN	Surface Mount	ROHS3

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement: STP16CPS05TTR (STMicroelectronics) provides the closest functional match with enhanced specifications. It maintains 16-output linear shift register topology, supports the 4.5V to 5.5V supply range, and delivers 100mA per-channel output capability. The device is RoHS3 compliant with active product status, ensuring long-term availability. The 24-TSSOP surface-mount package requires PCB redesign but offers superior thermal performance and manufacturing compatibility compared to the through-hole 24-DIP original.

Alternative for Constrained Supply Voltage (3V Minimum): TLC5923DAPR (Texas Instruments) extends the minimum supply voltage to 3V while maintaining 4.5V to 5.5V compatibility. This device delivers 80mA per-channel output, operates at 30MHz, and supports the extended temperature range of -40°C to 85°C. The 32-HTSSOP package provides thermal management advantages for high-current applications.

Low-Current Applications: TLC59281DBQR (Texas Instruments) is suitable for applications requiring 35mA per-channel output. Operating at 3V to 5.5V supply range with 35MHz frequency capability, this device is packaged in 24-SSOP format and maintains RoHS3 compliance with active product status.

High-Current Applications: TLC5904PZP (Texas Instruments) supports dual output current ratings of 80mA and 120mA per channel, accommodating demanding LED driving requirements. The 100-HTQFP package provides enhanced thermal dissipation. Supply voltage range is restricted to 4.5V to 5.5V, matching the original A6276SA specification.

Compact Package Requirement: TLC59282RGET and TLC59283RGET (Texas Instruments) offer the smallest footprint in 24-VQFN (4x4) format with 45mA per-channel output capability. Both devices support 3V to 5.5V supply range and operate at 35MHz with -40°C to 85°C temperature range.

All substitute parts carry RoHS3 compliance and active product status, eliminating obsolescence risk and ensuring regulatory alignment for new designs.

Frequently Asked Questions (FAQ)

Q: Can the A6276SA be directly replaced with a surface-mount substitute without circuit modification?

A: Direct pin-for-pin replacement is not possible due to package format differences. The A6276SA uses 24-DIP through-hole packaging, while all substitute parts employ surface-mount technologies (TSSOP, SSOP, HTQFP, VQFN, LSSOP). PCB redesign is required to accommodate the new package footprint. However, the functional shift register topology and 16-output configuration remain consistent across all substitutes.

Q: Which substitute part best matches the A6276SA supply voltage range?

A: STP16CPS05TTR and TLC5904PZP maintain the original 4.5V to 5.5V supply voltage range. However, most Texas Instruments substitutes (TLC59025IDBQR, TLC5923DAPR, TLC5924DAPR, TLC59281DBQR, TLC59282RGET, TLC59283RGET) extend the minimum supply voltage to 3V, providing greater design flexibility while maintaining 5.5V maximum compatibility.

Q: What is the significance of the output voltage parameter in selecting a substitute?

A: Output voltage indicates the maximum voltage the driver can deliver to LED loads. The A6276SA specifies 4V output voltage, while substitutes range from 10V to 26V. Higher output voltage capability allows driving LED strings with greater forward voltage drops. Selection should be based on the specific LED load requirements in the application circuit.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. The original A6276SA is RoHS non-compliant, making substitution necessary for applications requiring regulatory compliance with current environmental standards.

Q: How does the frequency specification affect substitute selection?

A: Frequency indicates the maximum serial clock speed for shift register operation. The A6276SA operates at 20MHz. Substitute parts range from 15MHz to 35MHz. Higher frequency capability provides design margin for faster data transfer rates. For applications operating at or below 20MHz, all substitutes are compatible.

Q: What is the impact of different output current ratings on circuit design?

A: Output current per channel determines the maximum LED current the driver can supply. The A6276SA provides 75.5mA per channel. Substitutes range from 35mA to 120mA. Selection must match the LED current requirements. Lower-current substitutes (35mA, 45mA) are suitable for indicator LEDs, while higher-current options (80mA, 100mA, 120mA) support brighter display applications.

Q: Which substitute offers the best thermal performance?

A: TLC5904PZP in 100-HTQFP package and TLC5921DAPR/TLC5923DAPR/TLC5924DAPR in 32-HTSSOP packages provide enhanced thermal dissipation through larger package footprints and exposed pad designs. These are recommended for high-current or high-frequency applications where thermal management is critical.

Q: Can substitutes with 3V minimum supply voltage replace the A6276SA in 5V-only systems?

A: Yes. All substitutes with 3V minimum supply voltage are fully compatible with 5V-only systems, as they support the full 3V to 5.5V range. This provides design flexibility for future applications requiring lower supply voltages.

Q: What is the MSL (Moisture Sensitivity Level) consideration for substitute selection?

A: MSL ratings indicate moisture sensitivity during storage and handling. The A6276SA has MSL 1 (unlimited shelf life). Most substitutes carry MSL 2 or MSL 3 ratings, requiring controlled storage conditions. MSL 2 allows 1 year of dry storage, while MSL 3 requires 168-hour dry bake before reflow soldering. Manufacturing processes must accommodate these requirements.

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