BD2045AFJ-E2 Equivalent & Substitute Parts

Part Overview

The BD2045AFJ-E2 is a Power Management IC (PMIC) manufactured by Rohm Semiconductor, classified as a Power Switch/Driver with 1:1 N-Channel configuration. This component operates as a USB Switch with high-side output configuration, rated for 250mA maximum output current and 80mOhm typical on-resistance. The BD2045AFJ-E2 is currently marked as Obsolete, making identification of equivalent and substitute parts essential for ongoing design support and component procurement.

Substiute Parts

BD2045AFJ-E2

Rohm SemiconductorIn Stock: 34218BD2045AFJ-E2 Datasheet

Current PartRFQ

BD2055AFJ-E2

Rohm SemiconductorIn Stock: 15653BD2055AFJ-E2 Datasheet

Parametric EquivalentRFQ

MAX1607ESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 4253MAX1607ESA+ Datasheet

SimilarRFQ

MAX1607ESA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 27689MAX1607ESA+T Datasheet

SimilarRFQ

MAX1922ESA+

Analog Devices Inc./Maxim IntegratedIn Stock: 2142MAX1922ESA+ Datasheet

SimilarRFQ

MAX1922ESA+C71073

Analog Devices Inc./Maxim IntegratedIn Stock: 2495MAX1922ESA+C71073 Datasheet

SimilarRFQ

MAX1922ESA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3356MAX1922ESA+T Datasheet

SimilarRFQ

TPS2045AD

Texas InstrumentsIn Stock: 2191TPS2045AD Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BD2045AFJ-E2 is determined by the following critical parameters:

Primary Matching Criteria:

• Switch Type: USB Switch or General Purpose
• Output Configuration: High Side
• Number of Outputs: 1
• Ratio - Input:Output: 1:1
• Voltage - Load: 2.7V ~ 5.5V (minimum requirement)
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C ~ 85°C (TA) or compatible subset

Secondary Consideration:

• Current - Output (Max): Substitute must meet or exceed 250mA
• Rds On (Typ): Lower or equal values are acceptable
• Output Type: N-Channel preferred; P-Channel variants available with design considerations

Substitute parts are grouped into two categories:

Parametric Equivalent: BD2055AFJ-E2 (Rohm Semiconductor) — Direct N-Channel equivalent with identical electrical specifications and package.

Similar Alternatives: MAX1607ESA+, MAX1607ESA+T, MAX1922ESA+, MAX1922ESA+C71073, MAX1922ESA+T (Analog Devices Inc./Maxim Integrated), and TPS2045AD (Texas Instruments) — These parts share the same package, voltage range, and high-side configuration but differ in output type (P-Channel vs. N-Channel) or current rating.

Parameter Comparison

Engineering Selection Recommendations

Direct Parametric Equivalent: BD2055AFJ-E2 is the primary substitute for BD2045AFJ-E2. Both parts are manufactured by Rohm Semiconductor with identical electrical specifications, package configuration, and operating temperature range. BD2055AFJ-E2 carries a "Not For New Designs" status, indicating limited long-term availability. For new designs, this part should be considered a transitional solution only.

Active Alternatives with Design Considerations:

TPS2045AD (Texas Instruments) provides the closest functional match among active products. It maintains N-Channel output type, identical current rating (250mA), matching on-resistance (80mOhm), and compatible voltage range. The operating temperature range is 0°C ~ 85°C, which is narrower than the original part. This part is suitable for applications not requiring the extended -40°C lower temperature limit.

MAX1607ESA+ and MAX1607ESA+T (Analog Devices Inc./Maxim Integrated) are active alternatives with higher current capability (700mA) and lower on-resistance (60mOhm). These parts use P-Channel output configuration, requiring circuit topology adjustment. Both maintain the 2.7V ~ 5.5V voltage range and 8-SOIC package.

MAX1922ESA+, MAX1922ESA+C71073, and MAX1922ESA+T (Analog Devices Inc./Maxim Integrated) offer the highest current rating (1A) among available substitutes with 70mOhm on-resistance. These P-Channel devices require design modification and are available in multiple packaging variants. All three variants maintain active product status and full compliance certifications.

Compliance and Certification: All substitute parts listed are ROHS3 Compliant, REACH Unaffected, and carry EAR99 ECCN classification, matching the original BD2045AFJ-E2 regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can BD2055AFJ-E2 be used as a direct replacement for BD2045AFJ-E2? A: Yes. BD2055AFJ-E2 is a parametric equivalent with identical electrical specifications, package, and operating temperature range. However, BD2055AFJ-E2 is marked "Not For New Designs," indicating limited future availability. It is suitable for legacy system support only.

Q: What is the primary difference between N-Channel and P-Channel substitutes? A: N-Channel devices (BD2045AFJ-E2, BD2055AFJ-E2, TPS2045AD) and P-Channel devices (MAX1607 and MAX1922 series) differ in gate drive polarity and circuit topology requirements. N-Channel substitutes require minimal circuit modification. P-Channel alternatives require redesign of the control logic and gate drive circuitry.

Q: Can MAX1607ESA+ or MAX1922ESA+ replace BD2045AFJ-E2 without circuit modification? A: No. These parts use P-Channel output configuration, requiring circuit topology changes. However, they offer superior electrical performance (lower on-resistance, higher current capability) and active product status, making them suitable for new designs with appropriate circuit redesign.

Q: What is the temperature operating range limitation of TPS2045AD? A: TPS2045AD operates from 0°C ~ 85°C, compared to BD2045AFJ-E2's -40°C ~ 85°C range. Applications requiring operation below 0°C must use alternative substitutes or the original part.

Q: Are all substitute parts available in 8-SOIC package? A: Yes. All listed substitutes use the 8-SOIC (0.154", 3.90mm Width) package, ensuring mechanical compatibility with existing PCB layouts.

Q: Which substitute offers the best long-term availability? A: MAX1607ESA+T, MAX1922ESA+, MAX1922ESA+C71073, and MAX1922ESA+T all carry "Active" product status from Analog Devices Inc./Maxim Integrated, indicating ongoing production and long-term availability. TPS2045AD from Texas Instruments also maintains active status.

Q: What are the key electrical differences between substitute options? A: Current rating ranges from 250mA (BD2055AFJ-E2, TPS2045AD) to 1A (MAX1922 series). On-resistance varies from 60mOhm (MAX1607 series) to 80mOhm (BD2055AFJ-E2, TPS2045AD). All maintain the 2.7V ~ 5.5V load voltage specification and high-side output configuration.