BD18KA5FP-E2 Equivalent & Substitute Parts

Part Overview

The BD18KA5FP-E2 is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed for positive fixed 1.8V output at 500mA in a TO-252 surface mount package. This Active product provides regulated power supply functionality with integrated over-current, over-temperature, and soft-start protection features. Substitute parts are identified based on matching output voltage, current rating, package type, and operating temperature range to ensure functional equivalence in circuit applications.

Substiute Parts

BD18KA5FP-E2

Rohm SemiconductorIn Stock: 18552BD18KA5FP-E2 Datasheet

Current PartRFQ

LP38691DT-1.8/NOPB

National SemiconductorIn Stock: 776LP38691DT-1.8/NOPB Datasheet

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LP38691DTX-1.8/NOPB

National SemiconductorIn Stock: 1370LP38691DTX-1.8/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BD18KA5FP-E2 are qualified based on the following critical parameters:

• Fixed output voltage of 1.8V
• Output current rating of 500mA
• TO-252-3 package configuration (DPAK with 2 Leads + Tab, SC-63)
• Surface mount mounting type
• Active product status
• Compatible operating temperature range (-40°C minimum, 105°C minimum maximum)

The LP38691 series from National Semiconductor meets these substitution criteria. Both LP38691DT-1.8/NOPB and LP38691DTX-1.8/NOPB variants provide identical electrical specifications for the regulated output and current delivery, with package equivalence in TO-252-3 format.

Parameter Comparison

Engineering Selection Recommendations

Both LP38691 variants qualify as functional substitutes for the BD18KA5FP-E2 based on matching output voltage, current rating, and package configuration. The LP38691 series demonstrates superior quiescent current performance (55 µA versus 550 µA) and extended maximum input voltage tolerance (10V versus 5.5V), with operating temperature range extending to 125°C. Both substitute parts maintain Active product status. Selection between LP38691DT-1.8/NOPB (Tape & Reel packaging) and LP38691DTX-1.8/NOPB (Bulk packaging) depends on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the BD18KA5FP-E2?

A: Substitution requires matching fixed output voltage (1.8V), output current rating (500mA), TO-252-3 package configuration, and compatible operating temperature range. Both electrical and mechanical parameters must align for direct circuit replacement.

Q: Are the LP38691 variants pin-compatible with the BD18KA5FP-E2?

A: Yes. Both LP38691DT-1.8/NOPB and LP38691DTX-1.8/NOPB use the TO-252-3 DPAK package with identical pin configuration (2 Leads + Tab, SC-63), enabling direct board-level substitution.

Q: What is the difference between LP38691DT-1.8/NOPB and LP38691DTX-1.8/NOPB?

A: The primary difference is packaging format. LP38691DT-1.8/NOPB is supplied in Tape & Reel format, while LP38691DTX-1.8/NOPB is supplied in Bulk format. Electrical specifications and package type are identical.

Q: Can the BD18KA5FP-E2 be used in applications requiring higher input voltage tolerance?

A: The BD18KA5FP-E2 is specified for maximum input voltage of 5.5V. Applications requiring higher input voltage tolerance should use LP38691 variants, which support up to 10V input.

Q: Are there temperature range considerations when substituting?

A: The BD18KA5FP-E2 operates from -40°C to 105°C. LP38691 variants extend the maximum operating temperature to 125°C, providing broader thermal margin in high-temperature environments.