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PCA9955BTWJ LED Driver IC Equivalent & Substitute Parts
Part Overview
The PCA9955BTWJ is a 16-output linear LED driver IC manufactured by NXP Semiconductors, designed for backlight applications. This active product operates across a 3V to 5.5V supply range with 65mA per-channel output capability in a 28-HTSSOP surface mount package. The device is ROHS3 compliant with MSL 1 rating, indicating unlimited moisture tolerance.
Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter set. Alternative sources may be required due to inventory availability, supply chain optimization, or application-specific grade requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Number of Outputs | 16 |
| Current - Output / Channel | 65mA |
| Voltage - Supply (Min) | 3V |
| Voltage - Supply (Max) | 5.5V |
| Type | Linear |
| Internal Switch(s) | Yes |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 28-TSSOP (0.173", 4.40mm Width) Exposed Pad |
| RoHS Status | ROHS3 Compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitution eligibility for the PCA9955BTWJ is determined by the following critical parameters:
- 16 output channels with linear driver topology
- 65mA maximum output current per channel
- 3V to 5.5V supply voltage range
- Surface mount packaging with exposed pad configuration
- Active product status with current manufacturing support
- ROHS3 compliance and MSL 1 rating
The PCA9955BTW/Q900J maintains full parametric equivalence across all electrical specifications and mechanical dimensions. The LED1642GWQTR represents a functional alternative with modified electrical characteristics (40mA per-channel output, PWM dimming topology, 24-QFN package) suitable for applications where these parameter variations are acceptable.
Parameter Comparison
| Parameter | PCA9955BTWJ | PCA9955BTW/Q900J | LED1642GWQTR |
|---|---|---|---|
| Manufacturer | NXP Semiconductors | NXP USA Inc. | STMicroelectronics |
| Number of Outputs | 16 | 16 | 16 |
| Current - Output / Channel | 65mA | 65mA | 40mA |
| Voltage - Supply (Min) | 3V | 3V | 3V |
| Voltage - Supply (Max) | 5.5V | 5.5V | 5.5V |
| Type | Linear | Linear | Linear |
| Internal Switch(s) | Yes | Yes | Yes |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 28-TSSOP (0.173", 4.40mm Width) Exposed Pad | 28-TSSOP (0.173", 4.40mm Width) Exposed Pad | 24-VFQFN Exposed Pad |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) |
Engineering Selection Recommendations
The PCA9955BTW/Q900J is a direct parametric equivalent to the PCA9955BTWJ. Both devices share identical electrical specifications, package dimensions, and compliance certifications. Selection between these two NXP variants is based on inventory availability and automotive-grade qualification status of the BTW/Q900J variant.
The LED1642GWQTR from STMicroelectronics is functionally compatible for applications where the following parameter modifications are acceptable: reduced per-channel output current (40mA versus 65mA), PWM-based dimming topology, shift register control architecture, and alternative package form factor (24-QFN versus 28-TSSOP). This device introduces a higher moisture sensitivity level (MSL 3) requiring controlled storage conditions. Selection of the LED1642GWQTR is appropriate when application requirements align with its specified electrical and mechanical characteristics.
All three devices maintain active product status with current manufacturing support and ROHS3 compliance.
Frequently Asked Questions (FAQ)
Q: Can the PCA9955BTW/Q900J be used as a direct replacement for the PCA9955BTWJ?
A: Yes. Both devices are parametrically equivalent across all electrical specifications, supply voltage range, output current rating, and package dimensions. PCB layout and firmware integration remain unchanged.
Q: What are the key differences between the PCA9955BTWJ and LED1642GWQTR?
A: The LED1642GWQTR operates at 40mA per-channel output current compared to 65mA for the PCA9955BTWJ. The LED1642GWQTR uses PWM-based dimming with shift register control, while the PCA9955BTWJ uses linear dimming. Package form factors differ: 24-QFN for the LED1642GWQTR versus 28-TSSOP for the PCA9955BTWJ. Moisture sensitivity is higher for the LED1642GWQTR (MSL 3 versus MSL 1).
Q: Is the LED1642GWQTR suitable for backlight applications?
A: The LED1642GWQTR is specified for signage applications. Substitution into backlight designs requires confirmation that the 40mA per-channel output current and PWM dimming topology meet application requirements.
Q: What packaging considerations apply to the LED1642GWQTR?
A: The LED1642GWQTR uses a 24-VFQFN package with exposed pad, differing from the 28-TSSOP package of the PCA9955BTWJ. PCB layout modifications are required. The MSL 3 rating requires controlled storage at specified humidity and temperature conditions.
Q: Are all three devices ROHS3 compliant?
A: Yes. The PCA9955BTWJ, PCA9955BTW/Q900J, and LED1642GWQTR are all ROHS3 compliant with REACH unaffected status.
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