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A6276SLW LED Driver IC Equivalent & Substitute Parts
Part Overview
The A6276SLW 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 operates within a 4.5V to 5.5V supply range and is packaged in 24-SOIC format. The product is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the core functionality of 16-output linear shift register topology while offering variations in electrical performance, packaging, and product status.
Substiute Parts
Key Parameters
| Parameter | A6276SLW |
|---|---|
| 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) |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the A6276SLW is determined by the following core parameters:
Mandatory Compatibility Criteria:
- Topology: Shift Register (all substitutes maintain this topology)
- Number of Outputs: 16 (all substitutes provide 16 outputs)
- Internal Switches: Yes (all substitutes include internal switching capability)
- Supply Voltage Range: Minimum 3V to 5.5V maximum (all substitutes support the A6276SLW operating range of 4.5V to 5.5V)
Variable Parameters Affecting Substitution:
- Current per Channel: Ranges from 35mA to 120mA across substitutes
- Output Voltage: Ranges from 3V to 20V across substitutes
- Operating Frequency: Ranges from 20MHz to 35MHz
- Package Type: 24-SOIC, 24-TSSOP, 24-SSOP, 24-VQFN, 28-HTSSOP, 32-VQFN
- Operating Temperature Range: -40°C to 125°C (extended range available)
- Product Status: Active, Last Time Buy, or Obsolete
Substitutes are grouped by electrical performance capability and packaging compatibility. Selection depends on specific application requirements for current handling, output voltage, frequency response, and thermal operating range.
Parameter Comparison
| Part Number | Manufacturer | Outputs | Supply Min (V) | Supply Max (V) | Output Voltage | Current/Channel (mA) | Frequency (MHz) | Package | Temp Range (°C) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A6276SLW | Allegro MicroSystems | 16 | 4.5 | 5.5 | 4V | 75.5 | 20 | 24-SOIC | -20 ~ 85 | Obsolete | Non-compliant |
| MAX6979AUG+ | Analog Devices Inc./Maxim Integrated | 16 | 3 | 5.5 | 5.5V | 55 | — | 24-TSSOP | -40 ~ 125 | Active | ROHS3 Compliant |
| STP16DPP05XTTR | STMicroelectronics | 16 | 3 | 5.5 | 20V | 40 | 30 | 24-TSSOP-EP | -40 ~ 125 | Active | ROHS3 Compliant |
| TLC5923RHBR | Texas Instruments | 16 | 3 | 5.5 | 17V | 80 | 30 | 32-VQFN (5x5) | -40 ~ 85 | Active | ROHS3 Compliant |
| TLC5924RHBT | Texas Instruments | 16 | 3 | 5.5 | 15V | 80 | 30 | 32-VQFN (5x5) | -40 ~ 85 | Last Time Buy | ROHS3 Compliant |
| TLC5927IDBQR | Texas Instruments | 16 | 3 | 5.5 | 17V | 120 | 30 | 24-SSOP | -40 ~ 85 | Active | ROHS3 Compliant |
| TLC5928PW | Texas Instruments | 16 | 3 | 5.5 | 17V | 35 | 35 | 24-TSSOP | -40 ~ 85 | Active | ROHS3 Compliant |
| TLC59291RGET | Texas Instruments | 16 | 3 | 5.5 | 10V | 50 | 33 | 24-VQFN (4x4) | -40 ~ 85 | Active | ROHS3 Compliant |
| TLC5929RGET | Texas Instruments | 16 | 3 | 5.5 | 10V | 50 | 20 | 24-VQFN (4x4) | -40 ~ 85 | Active | ROHS3 Compliant |
| TLC5944PWP | Texas Instruments | 16 | 3 | 5.5 | 3V ~ 15V | 60 | 30 | 28-HTSSOP | -40 ~ 85 | Active | ROHS3 Compliant |
| TLC5948APWPR | Texas Instruments | 16 | 3 | 5.5 | 10V | 60 | — | 24-HTSSOP | -40 ~ 85 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement (Minimum Design Changes): MAX6979AUG+ and TLC5927IDBQR are active products with ROHS3 compliance. MAX6979AUG+ operates at extended temperature range (-40°C to 125°C) and provides 55mA per channel. TLC5927IDBQR delivers higher current capability at 120mA per channel with standard operating range (-40°C to 85°C).
For Compact Packaging: TLC59291RGET and TLC5929RGET offer 24-VQFN (4x4) packages with 50mA per-channel output, suitable for space-constrained applications. Both are active products with ROHS3 compliance and operate across -40°C to 85°C.
For Higher Current Applications: TLC5923RHBR and TLC5924RHBT provide 80mA per-channel in 32-VQFN (5x5) packages. TLC5923RHBR is active; TLC5924RHBT is Last Time Buy status. Both support -40°C to 85°C operating range.
For Lower Current Requirements: TLC5928PW delivers 35mA per channel with the highest frequency rating (35MHz) in 24-TSSOP package, suitable for applications requiring reduced power dissipation.
Compliance Consideration: All substitute parts listed are ROHS3 compliant, addressing the non-compliance status of the obsolete A6276SLW. Active product status is preferred for long-term availability; Last Time Buy status (TLC5924RHBT) indicates limited future supply.
Frequently Asked Questions (FAQ)
Q: Can any of these substitutes directly replace the A6276SLW without PCB redesign?
A: Direct replacement depends on package compatibility. The A6276SLW uses 24-SOIC packaging. Substitutes using 24-TSSOP, 24-SSOP, 24-VQFN, or 24-HTSSOP packages require PCB layout modifications due to different pin pitch and footprint dimensions. Substitutes in 32-VQFN packages require significant redesign.
Q: What is the primary difference between TLC5927IDBQR and TLC5928PW?
A: TLC5927IDBQR provides 120mA per-channel output current in 24-SSOP package, while TLC5928PW delivers 35mA per-channel in 24-TSSOP package. Selection depends on application current requirements and available board space.
Q: Are all substitutes compatible with the 4.5V to 5.5V supply range of the A6276SLW?
A: Yes. All substitute parts support a minimum supply voltage of 3V and maximum of 5.5V, encompassing the A6276SLW operating range of 4.5V to 5.5V.
Q: What does "Last Time Buy" status mean for TLC5924RHBT?
A: Last Time Buy indicates the manufacturer has announced end-of-life for this product. Existing inventory may be available, but future production is not guaranteed. For new designs, active products such as TLC5923RHBR are recommended.
Q: How do output voltage ratings affect substitution?
A: Output voltage ratings indicate the maximum voltage the driver can source to LED loads. The A6276SLW supports 4V output. Substitutes range from 3V to 20V output capability. Higher output voltage ratings provide greater design flexibility for different LED string configurations but do not prevent substitution if the application requires lower voltages.
Q: Which substitute offers the best thermal performance for extended temperature applications?
A: MAX6979AUG+ operates across -40°C to 125°C, the widest temperature range among substitutes. This extended range is beneficial for industrial and automotive applications requiring operation beyond standard -40°C to 85°C limits.
Q: Is RoHS compliance mandatory for all substitutes?
A: All listed substitutes are ROHS3 compliant. The original A6276SLW is RoHS non-compliant. For applications subject to RoHS regulations, any substitute part satisfies compliance requirements.
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