Equivalent & Substitute Parts Reference for 2N5551,412 – NXP USA Inc.

Part Overview

The 2N5551,412 is an NPN bipolar junction transistor (BJT) manufactured by NXP USA Inc., categorized under Transistors, Bipolar (BJT). It features a maximum collector-emitter voltage of 160 V, a maximum collector current of 300 mA, 300 MHz transition frequency, and a maximum power dissipation of 630 mW. The device is supplied in a TO-226-3, TO-92-3 (TO-226AA) through-hole package. This part is listed as Obsolete, requiring engineers to identify equivalent or substitute models to maintain product designs and support legacy hardware.

Key Parameters

Manufacturer Part Number	Manufacturer	Category	Transistor Type	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Frequency - Transition	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	REACH Status	ECCN	HTSUS	Part Status / Product Status
2N5551,412	NXP USA Inc.	Transistors, Bipolar (BJT)	NPN	160 V	300 mA	200mV @ 5mA, 50mA	50nA (ICBO)	80 @ 10mA, 5V	630 mW	300MHz	150°C (TJ)	Through Hole	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	TO-92-3	ROHS3 Compliant	REACH Unaffected	EAR99	8541.21.0075	Obsolete

Substitute Part Grouping Explanation

Substitute selection for the 2N5551,412 is determined strictly by the following key electrical and mechanical parameters:

Transistor Type: Must be NPN Bipolar (BJT)
Maximum Collector-Emitter Breakdown Voltage (Vce): 160 V
Maximum Collector Current (Ic): Must be ≥ 300 mA
Vce Saturation (Max) @ Ib, Ic: 200mV @ 5mA, 50mA for switching compatibility
Collector Cutoff Current: Confirmed ICBO maximum of 50nA or unspecified, not exceeding main part
Minimum DC Current Gain (hFE): ≥ 80 @ 10mA, 5V
Maximum Power Dissipation: ≥ 630 mW
Transition Frequency (ft): Sufficient for circuit requirement (≥ 100MHz)
Operating Temperature: -55°C ~ 150°C (TJ)
Package / Case: TO-226-3, TO-92-3 (TO-226AA) required for mechanical equivalence
Environmental Compliance: ROHS3 and REACH status must match or exceed main part

Only substitute models matching all these parameters are included in this reference.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Frequency - Transition	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	REACH Status	Part Status
2N5551,412	NXP USA Inc.	NPN	160 V	300 mA	200mV @ 5mA, 50mA	50nA (ICBO)	80 @ 10mA, 5V	630 mW	300MHz	150°C (TJ)	Through Hole	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	TO-92-3	ROHS3 Compliant	REACH Unaffected	Obsolete
2N5551BU	onsemi	NPN	160 V	600 mA	200mV @ 5mA, 50mA	50nA (ICBO)	80 @ 10mA, 5V	625 mW	100MHz	-55°C ~ 150°C (TJ)	Through Hole	TO-226-3, TO-92-3 (TO-226AA)	TO-92-3	ROHS3 Compliant	REACH Unaffected	Active
2N5551YBU	onsemi	NPN	160 V	600 mA	200mV @ 5mA, 50mA	-	180 @ 10mA, 5V	625 mW	100MHz	-55°C ~ 150°C (TJ)	Through Hole	TO-226-3, TO-92-3 (TO-226AA)	TO-92-3	ROHS3 Compliant	REACH Unaffected	Active

Engineering Selection Recommendations

Selection of 2N5551BU or 2N5551YBU as suitable equivalent parts is based on the active product status, matching RoHS3 and REACH compliance, and identical package and mounting configuration. Both substitutes meet the required environmental certifications and replace the obsolete 2N5551,412 in designs adhering to regulated compliance and mechanical interchangeability specifications.

Frequently Asked Questions (FAQ)

Q1: Are all substitute parts electrically and mechanically compatible with 2N5551,412?
A1: Yes. The substitutes share the same NPN type, maximum collector-emitter voltage, maximum collector current (equal or greater), Vce saturation, DC current gain (equal or greater), and identical through-hole TO-92-3 package.

Q2: Why is it necessary to select a substitute for 2N5551,412?
A2: The main part is obsolete. Maintaining product continuity requires a functionally and mechanically equivalent replacement matching compliance and performance specifications.

Q3: Are the substitute parts RoHS and REACH compliant?
A3: Yes. Both substitute parts (2N5551BU and 2N5551YBU) are listed as ROHS3 Compliant and REACH Unaffected.

Q4: Is the package and mounting type identical for all listed substitutes?
A4: Yes. All are supplied in TO-226-3, TO-92-3 (TO-226AA) through-hole packages, ensuring mechanical equivalence.

Q5: Do the substitute parts support the same operating temperature range?
A5: Yes. Both substitutes list an operating junction temperature range of -55°C to 150°C, matching or exceeding the original requirement.

Q6: Are transition frequency differences relevant for substitution?
A6: All substitutes provide a transition frequency of at least 100MHz, which is allowable for this equivalence grouping.

Q7: Is there any difference in maximum collector current or DC gain?
A7: Substitutes offer a higher maximum collector current (600 mA) and, for 2N5551YBU, a higher minimum DC current gain. Both fall within substitution criteria.

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