BD7844AEFV-E2 LED Driver IC: Equivalent & Substitute Parts

Part Overview

The BD7844AEFV-E2 is a 16-output linear LED driver IC manufactured by Rohm Semiconductor, designed for signage applications requiring 80mA per-channel output capability. This device operates within a 4.5V to 5.5V supply range and is packaged in a 28-HTSSOP surface mount configuration with an exposed pad.

The BD7844AEFV-E2 carries a "Not For New Designs" product status, making identification of functionally equivalent alternatives essential for ongoing production and new project development. Substitute parts must maintain compatibility across critical electrical parameters including output current, supply voltage range, package form factor, and thermal operating specifications.

Key Parameters

Parameter	BD7844AEFV-E2 Specification
Manufacturer	Rohm Semiconductor
Category	Power Management (PMIC)
Type	Linear LED Driver
Number of Outputs	16
Current - Output / Channel	80mA
Voltage - Supply (Min)	4.5V
Voltage - Supply (Max)	5.5V
Voltage - Output	20V
Package / Case	28-VSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
Internal Switch(s)	Yes
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution eligibility for the BD7844AEFV-E2 is determined by the following critical parameters:

Number of Outputs: Must equal 16 channels
Current - Output / Channel: Must support minimum 80mA per channel
Voltage - Supply Range: Must encompass or exceed 4.5V to 5.5V operating window
Voltage - Output: Must support minimum 20V output capability
Package / Case: Must be compatible with 28-pin surface mount footprint (28-HTSSOP or equivalent)
Operating Temperature: Must maintain -40°C to 85°C range
Internal Switch(s): Must include integrated switching capability
RoHS Compliance: Must meet ROHS3 standard

Substitute parts are grouped into two categories based on topology and electrical performance alignment:

Category A - Direct Topology Match (Shift Register): TLC5945PWP and TLC5948ADBQR maintain shift register topology with comparable frequency specifications and output voltage ratings.

Category B - Functional Equivalence (Linear Topology): TLC5929DBQR provides linear topology with reduced per-channel current (50mA) but maintains 16-output configuration and signage application alignment.

Category C - Alternative Architecture: MAX7304ETG+ offers 16-output linear dimming but operates at significantly lower supply voltage (1.62V to 3.6V) and reduced per-channel current (20mA), suitable only for applications with modified electrical requirements.

Parameter Comparison

Parameter	BD7844AEFV-E2	TLC5945PWP	TLC5948ADBQR	TLC5929DBQR	MAX7304ETG+
Manufacturer	Rohm Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc./Maxim Integrated
Number of Outputs	16	16	16	16	16
Current - Output / Channel	80mA	80mA	60mA	50mA	20mA
Voltage - Supply (Min)	4.5V	3V	3V	3V	1.62V
Voltage - Supply (Max)	5.5V	5.5V	5.5V	5.5V	3.6V
Voltage - Output	20V	17V	10V	10V	—
Type	Linear	Linear	Linear	Linear	Linear
Topology	—	Shift Register	Shift Register	Shift Register	—
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	28-VSSOP (0.173", 4.40mm Width)	28-PowerTSSOP (0.173", 4.40mm Width)	24-SSOP (0.154", 3.90mm Width)	24-SSOP (0.154", 3.90mm Width)	24-WFQFN Exposed Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

Primary Substitute: TLC5945PWP

The TLC5945PWP from Texas Instruments is the closest functional equivalent to the BD7844AEFV-E2. Both devices support 80mA per-channel output current, maintain identical 16-output configuration, and operate within overlapping supply voltage ranges (3V to 5.5V encompasses the BD7844AEFV-E2 requirement of 4.5V to 5.5V). The TLC5945PWP is packaged in 28-PowerTSSOP, maintaining the same 0.173" width and pin count as the original device. Output voltage capability (17V) is slightly reduced compared to the BD7844AEFV-E2 (20V) but remains suitable for most signage applications. The TLC5945PWP carries "Last Time Buy" status, indicating limited future availability.

Secondary Substitute: TLC5948ADBQR

The TLC5948ADBQR provides active product status with high inventory availability (65,400 units). This device maintains 16-output configuration and shift register topology but operates at 60mA per-channel output current, representing a 25% reduction from the BD7844AEFV-E2 specification. Supply voltage range (3V to 5.5V) and operating temperature (-40°C to 85°C) remain compatible. Package form factor changes to 24-SSOP, requiring PCB layout modification. This substitute is suitable for applications where 60mA per-channel current capacity is sufficient.

Tertiary Substitute: TLC5929DBQR

The TLC5929DBQR offers active product status with substantial inventory (8,846 units). This device maintains 16-output linear configuration and signage application alignment but provides 50mA per-channel output current. Supply voltage range (3V to 5.5V) and operating temperature specifications remain compatible. Package form factor is 24-SSOP, requiring PCB redesign. This substitute is applicable only when per-channel current requirements can be reduced to 50mA.

Not Recommended: MAX7304ETG+

The MAX7304ETG+ does not meet electrical substitution criteria for the BD7844AEFV-E2. Supply voltage range (1.62V to 3.6V) does not encompass the required 4.5V to 5.5V operating window. Per-channel output current (20mA) represents a 75% reduction from specification. Package form factor (24-WFQFN) differs from the original 28-pin configuration. This device is suitable only for applications with fundamentally different electrical requirements.

Frequently Asked Questions (FAQ)

Q: Can the TLC5945PWP directly replace the BD7844AEFV-E2 without PCB modification?

A: The TLC5945PWP maintains identical pin count (28) and package width (0.173", 4.40mm), enabling direct footprint compatibility. However, pinout verification against device datasheets is required before implementation. The "Last Time Buy" status indicates limited future availability.

Q: What is the impact of using TLC5948ADBQR at 60mA per-channel instead of 80mA?

A: The 25% current reduction affects maximum LED brightness and power delivery capability per channel. Applications must be evaluated to confirm that 60mA per-channel output current satisfies brightness and load requirements. PCB layout modification is required due to 24-SSOP package form factor.

Q: Why is the MAX7304ETG+ not suitable as a substitute?

A: The MAX7304ETG+ operates at 1.62V to 3.6V supply voltage, which does not overlap with the BD7844AEFV-E2 requirement of 4.5V to 5.5V. Per-channel output current (20mA) is insufficient for most signage applications requiring 80mA capability. This device is designed for fundamentally different application requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (TLC5945PWP, TLC5948ADBQR, TLC5929DBQR, and MAX7304ETG+) meet ROHS3 compliance standards, maintaining regulatory alignment with the original BD7844AEFV-E2.

Q: What packaging considerations apply when switching from BD7844AEFV-E2 to TLC5948ADBQR or TLC5929DBQR?

A: Both TLC5948ADBQR and TLC5929DBQR use 24-SSOP packaging, reducing pin count from 28 to 24 and changing package width from 0.173" to 0.154". PCB footprint redesign is required. Pinout mapping must be verified against individual device datasheets to ensure correct signal routing.

Q: Which substitute offers the best long-term availability?

A: The TLC5948ADBQR carries "Active" product status with the highest inventory level (65,400 units), indicating the strongest long-term availability. The TLC5945PWP is marked "Last Time Buy," indicating limited future supply. The TLC5929DBQR is also "Active" with 8,846 units in stock.

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