BUJ103AD,118 Equivalent & Substitute Parts Reference

Part Overview

The WeEn Semiconductors BUJ103AD,118 is an NPN bipolar junction transistor (BJT) specified for 400 V, 4 A, and 80 W power handling, presented in a surface-mount DPAK package. The device is RoHS compliant and classified under Transistors, Bipolar (BJT). This part remains Active with available inventory. When BUJ103AD,118 is in short supply or to standardize sourcing, it is necessary to identify alternative models that fall within the same electrical and mechanical parameters as defined for this product category.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	400 V
Current - Collector (Ic) (Max)	4 A
Vce Saturation (Max) @ Ib, Ic	1V @ 600mA, 3A
Current - Collector Cutoff (Max)	100µA
DC Current Gain (hFE) (Min) @ Ic, Vce	13 @ 500mA, 5V
Power - Max	80 W
Operating Temperature	150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution is determined by matching the following key parameters between BUJ103AD,118 and candidate transistors:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 400 V
Current - Collector (Ic) (Max): At least 4 A
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type: Surface Mount
Operating Temperature: 150°C (TJ)
Compliance: RoHS or ROHS3, MSL 1

Other supporting parameters such as Vce(sat), hFE, and maximum power are used to confirm functional and package compatibility within the product category.

Parameter Comparison

Parameter	BUJ103AD,118 WeEn Semiconductors	FJD3305H1TM onsemi	FJD5304DTF onsemi	FJD5555TM onsemi	MJD50G onsemi	STLD128DNT4 STMicroelectronics
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	400 V	400 V	400 V	400 V	400 V	400 V
Current - Collector (Ic) (Max)	4 A	4 A	4 A	5 A	1 A	4 A
Vce Saturation (Max)	1V @ 600mA, 3A	1V @ 1A, 4A	1.5V @ 500mA, 2.5A	1.5V @ 1A, 3.5A	1V @ 200mA, 1A	1V @ 400mA, 2A
Current - Collector Cutoff (Max)	100µA	1µA (ICBO)	100µA	-	200µA	250µA
DC Current Gain (hFE) (Min) @ Ic, Vce	13 @ 500mA, 5V	8 @ 2A, 5V	8 @ 2A, 5V	20 @ 800mA, 3V	30 @ 300mA, 10V	8 @ 2A, 5V
Power - Max	80 W	1.1 W	30 W	1.34 W	1.56 W	20 W
Operating Temperature	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	-65°C ~ 150°C (TJ)	150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All compared substitute parts have RoHS or ROHS3 compliance and an MSL rating of 1 (Unlimited). Product status varies: FJD3305H1TM is Last Time Buy, while others remain Active. Selection among these substitutes can be based directly on compliance, product status, and industry certification as detailed; parts marked as Active and compliant meet substitute requirements based on supplied parameters.

Frequently Asked Questions (FAQ)

What parameters are critical when selecting substitutes for BUJ103AD,118?

Key parameters include transistor type (NPN), voltage rating (400 V), collector current (minimum 4 A), power rating, package (TO-252-3, DPAK), mounting type (Surface Mount), and RoHS compliance.

Are all listed substitutes compatible with the TO-252-3, DPAK footprint?

Yes. All substitutes specify the TO-252-3, DPAK (2 Leads + Tab), SC-63 package, enabling drop-in replacement within this package class.

Do product status or supplier differences impact selection?

Parts designated as Active are directly interchangeable on product status criteria. "Last Time Buy" indicates limited future supply and should be considered accordingly within project timelines.

Is it necessary to match power dissipation ratings exactly?

Match the power rating as closely as possible within the catalogued product category. All listed substitutes fall within surface-mount power BJT norms as defined in the source data.

Are there RoHS or moisture sensitivity differences among substitutes?

All substitutes listed hold RoHS or ROHS3 compliance and MSL 1 (Unlimited), ensuring consistent requirements for lead-free and moisture handling protocols.

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