PAM2842TJR Equivalent & Substitute Parts

Part Overview

The PAM2842TJR is a LED Driver IC manufactured by Diodes Incorporated, classified as a Power Management PMIC. This device integrates a 1-output DC-DC regulator with SEPIC, Step-Down (Buck), and Step-Up (Boost) topologies, delivering 4.6A switch current in a 40-QFN (6x6) package. The PAM2842TJR supports analog and PWM dimming for backlight applications and operates across -40°C to 85°C.

The PAM2842TJR is marked as Obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support long-term product support for applications currently using this component.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	PAM2842TJR
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	SEPIC, Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1
Voltage Supply (Min)	5.5V
Voltage Supply (Max)	40V
Current Output / Channel	4.6A (Switch)
Dimming	Analog, PWM
Package / Case	40-WFQFN Exposed Pad
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PAM2842TJR is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: SEPIC, Step-Down (Buck), Step-Up (Boost) capability
Number of Outputs: 1 output configuration
Current Output / Channel: 4.6A (Switch) or higher
Voltage Supply Range: Minimum 5.5V to maximum 40V or compatible range
Dimming Support: Analog and/or PWM dimming capability
Package Type: Surface mount with exposed pad preferred for thermal performance
Operating Temperature: -40°C to 85°C or extended range
Product Status: Active preferred for long-term availability
Compliance: ROHS3 compliant, MSL 1

Substitute Categories:

Direct Topology Match (SEPIC + Buck + Boost): LT3955IUHE#PBF, LT3519IMS-2#TRPBF — These devices maintain all three topologies with comparable current ratings and voltage ranges.
Dual Topology Match (SEPIC + Boost or Buck + Boost): LM3410YMFX/NOPB, LT3519EMS-2#TRPBF, LT3519IMS#TRPBF — These provide two of the three topologies with reduced current output but active product status.
Single Topology Alternatives (Boost or Buck): FAN5333ASX, LM3406HVMHX/NOPB, LM3435SQ/NOPB, LM3642TLE-LT/NOPB, LT3932IUFD#TRPBF — These offer single-topology solutions suitable for specific application requirements where full topology flexibility is not required.

Parameter Comparison

Parameter	PAM2842TJR	LT3955IUHE#PBF	LT3519IMS-2#TRPBF	LM3410YMFX/NOPB	LT3932IUFD#TRPBF	FAN5333ASX
Manufacturer	Diodes Inc.	Analog Devices	Analog Devices	Texas Instruments	Analog Devices	onsemi
Topology	SEPIC, Buck, Boost	Flyback, SEPIC, Buck, Boost	SEPIC, Buck, Boost	SEPIC, Boost	Buck	Boost
Number of Outputs	1	1	1	1	1	1
Voltage Supply (Min)	5.5V	4.5V	3V	2.7V	3.6V	1.8V
Voltage Supply (Max)	40V	60V	30V	5.5V	36V	5.5V
Current Output / Channel	4.6A (Switch)	4.6A (Switch)	750mA (Switch)	2.8A (Switch)	2A	1.5A (Switch)
Dimming	Analog, PWM	Analog, PWM	Analog, PWM	PWM	Analog, PWM	Analog, PWM
Package / Case	40-WFQFN Exposed Pad	36-WFQFN Exposed Pad	16-TFSOP	SC-74A, SOT-753	28-WFQFN Exposed Pad	SC-74A, SOT-753
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Highest Compatibility):

LT3955IUHE#PBF (Analog Devices) is the primary substitute. It maintains identical topology coverage (SEPIC, Buck, Boost), matches the 4.6A switch current specification, and extends the maximum supply voltage to 60V. Operating temperature extends to 125°C. Active product status ensures long-term availability. ROHS3 compliant with MSL 1. Package is 36-WFQFN with exposed pad, requiring PCB layout verification for thermal performance equivalence.

Tier 2 - High Compatibility (Topology Match with Current Reduction):

LT3519IMS-2#TRPBF (Analog Devices) provides SEPIC, Buck, and Boost topologies with reduced switch current (750mA). Suitable for applications where 4.6A is not required. Supply voltage range 3V to 30V. Operating temperature -40°C to 125°C. Active status. 16-MSOP package requires significant PCB layout redesign.

Tier 3 - Application-Specific Alternatives:

LM3410YMFX/NOPB (Texas Instruments) offers SEPIC and Boost topologies with 2.8A switch current. Limited to 2.7V to 5.5V supply range, suitable for low-voltage backlight applications. Active status, -40°C to 125°C operating range. SOT-23-5 package significantly reduces board space.

LT3932IUFD#TRPBF (Analog Devices) provides Buck topology only with 2A current. Supply range 3.6V to 36V. Automotive grade. Active status. 28-QFN package. Suitable for step-down applications where boost capability is not required.

Compliance Verification:

All substitute parts maintain ROHS3 compliance and MSL 1 rating. All are active products with established supply chains. Extended operating temperature ranges (to 125°C) provide design margin beyond the original PAM2842TJR specification.

Frequently Asked Questions (FAQ)

Q: Can LT3955IUHE#PBF directly replace PAM2842TJR without PCB modifications?

A: LT3955IUHE#PBF maintains functional equivalence in topology, current rating, and dimming capability. However, the package differs (36-QFN vs. 40-QFN). PCB layout verification is required, particularly for thermal pad sizing and trace routing. Pin-to-pin compatibility must be confirmed against specific application schematics.

Q: Why does LT3519IMS-2#TRPBF have lower current output (750mA vs. 4.6A)?

A: LT3519IMS-2#TRPBF is designed for lower-power LED driver applications. It maintains the same topology flexibility but with reduced switch current capacity. Selection depends on application power requirements. For 4.6A applications, this part is not suitable.

Q: Is FAN5333ASX suitable for applications requiring SEPIC or Buck topology?

A: No. FAN5333ASX provides only Boost topology. It is suitable only for applications where step-up voltage conversion is the sole requirement. Applications requiring SEPIC or Buck functionality must select alternatives from Tier 1 or Tier 2.

Q: What is the impact of operating temperature differences between PAM2842TJR (-40°C to 85°C) and substitute parts (-40°C to 125°C)?

A: Substitute parts with extended temperature ranges provide additional design margin and are suitable for applications operating within the original PAM2842TJR temperature specification. The extended range does not create compatibility issues; it provides additional operational headroom.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 rating, matching the original PAM2842TJR compliance profile.

Q: Which substitute part has the smallest package footprint?

A: FAN5333ASX and LM3410YMFX/NOPB both use SOT-23-5 packages, providing the smallest footprint. LM3642TLE-LT/NOPB uses 9-DSBGA (1.6x1.6), the most compact option. Package selection depends on application space constraints and thermal requirements.

Q: Can multiple substitute parts be used in the same design for different circuit sections?

A: Yes. Different sections of a design may have different topology and current requirements. Tier 3 alternatives (LT3932IUFD#TRPBF for buck-only sections, FAN5333ASX for boost-only sections) can be used alongside Tier 1 or Tier 2 parts where full topology flexibility is required.

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