PCA9624PW,118 LED Driver IC - Equivalent & Substitute Parts

Part Overview

The PCA9624PW,118 is an 8-output linear PWM LED driver IC manufactured by NXP USA Inc., designed for backlight applications with 100mA per-channel output capability. This component operates across a 2.3V to 5.5V supply range and features PWM dimming functionality at frequencies between 100kHz and 1MHz. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	PCA9624PW,118
Manufacturer	NXP USA Inc.
Category	Power Management (PMIC)
Number of Outputs	8
Current - Output / Channel	100mA
Voltage - Supply (Min)	2.3V
Voltage - Supply (Max)	5.5V
Voltage - Output	40V
Frequency	100kHz ~ 1MHz
Dimming	PWM
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	24-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the PCA9624PW,118 are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Linear driver topology with internal switching capability
PWM or equivalent dimming control
Surface mount packaging suitable for automated assembly
Operating temperature range of -40°C to 85°C minimum
ROHS3 compliance and MSL rating of 1 or 2
Supply voltage range overlap with 2.3V–5.5V window
Output current capability of 65mA or greater per channel

Substitute Parts Identified:

PCA9955BTWJ – NXP Semiconductors active product with 16 outputs, 65mA per channel, 28-HTSSOP package
IS31BL3230-QFLS2-TR – Lumissil Microsystems with 8 outputs, 90mA per channel, PWM dimming, 16-QFN package (obsolete status)
HEF4794BT-Q100J – Nexperia USA Inc. with 8 outputs, 40mA per channel, shift register topology, 16-SOIC package (automotive qualified)

Parameter Comparison

Parameter	PCA9624PW,118	PCA9955BTWJ	IS31BL3230-QFLS2-TR	HEF4794BT-Q100J
Manufacturer	NXP USA Inc.	NXP Semiconductors	Lumissil Microsystems	Nexperia USA Inc.
Number of Outputs	8	16	8	8
Current - Output / Channel	100mA	65mA	90mA	40mA
Voltage - Supply (Min)	2.3V	3V	2.7V	3V
Voltage - Supply (Max)	5.5V	5.5V	5.5V	15V
Dimming	PWM	Not specified	PWM	Not specified
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	24-TSSOP	28-HTSSOP	16-QFN (3x3)	16-SOIC
Product Status	Obsolete	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1	1	3	1

Engineering Selection Recommendations

PCA9955BTWJ is the primary recommended substitute. It is an active NXP product with identical supply voltage range (3V–5.5V), matching operating temperature (-40°C to 85°C), MSL rating of 1, and ROHS3 compliance. The 16-output configuration provides functional expansion over the original 8-output design. The 65mA per-channel output is lower than the original 100mA specification; applications requiring full 100mA per channel must evaluate load requirements independently.

IS31BL3230-QFLS2-TR offers the closest electrical match with 90mA per-channel output and PWM dimming identical to the original part. However, this part carries obsolete status and MSL rating of 3 (168 hours), requiring controlled storage conditions. This option is suitable only when active alternatives cannot meet design constraints.

HEF4794BT-Q100J provides an alternative with extended temperature range (-40°C to 125°C) and automotive AEC-Q100 qualification. The 40mA per-channel output and shift register topology represent significant functional differences. This part is appropriate for automotive applications or designs requiring extended temperature operation where output current requirements are lower.

Frequently Asked Questions (FAQ)

Q: Can PCA9955BTWJ directly replace PCA9624PW,118 in existing designs?

A: PCA9955BTWJ is functionally compatible for backlight applications within the overlapping supply voltage range (3V–5.5V). The 16-output configuration accommodates the original 8-output requirement. The 65mA per-channel output is lower than the original 100mA specification; designs operating at or near 100mA per channel must be re-evaluated for current headroom.

Q: What is the significance of the MSL rating difference between PCA9624PW,118 and IS31BL3230-QFLS2-TR?

A: PCA9624PW,118 carries MSL 1 (unlimited shelf life), while IS31BL3230-QFLS2-TR carries MSL 3 (168-hour floor life after moisture exposure). MSL 3 components require controlled storage and handling procedures to prevent moisture absorption, increasing supply chain complexity.

Q: Why does HEF4794BT-Q100J have a higher maximum supply voltage (15V) than the original part?

A: HEF4794BT-Q100J is designed for broader industrial and automotive applications. The extended voltage range does not affect compatibility with 5.5V maximum designs; the part operates safely within the original supply window.

Q: Are package differences between these parts significant for PCB redesign?

A: Yes. PCA9624PW,118 uses 24-TSSOP, while substitutes use 28-HTSSOP, 16-QFN, or 16-SOIC packages. Each package has different footprint dimensions, pin counts, and thermal characteristics. PCB layout redesign is required for any package change.

Q: Which substitute is recommended for new production designs?

A: PCA9955BTWJ is recommended for new designs due to active product status, matching operating temperature range, MSL 1 rating, and availability. Designs must accommodate the 16-output configuration and 65mA per-channel output specification.

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