Equivalent & Substitute Parts Reference for BC557C,126 (NXP USA Inc.)

Part Overview

The BC557C,126 from NXP USA Inc. is a PNP bipolar junction transistor (BJT) designed for through-hole mounting in TO-92-3 packages. It features a maximum collector-emitter voltage of 45 V, a collector current of 100 mA, and a transition frequency of 100 MHz. The device supports power dissipation of up to 500 mW and is compliant with RoHS3 and REACH requirements. This part is classified as obsolete, making it necessary to identify substitute or equivalent transistors for ongoing designs and maintenance involving BJTs in similar electrical and mechanical configurations.

Key Parameters

Parameter	Value
Transistor Type	PNP
Voltage - Collector Emitter Breakdown (Max)	45 V
Current - Collector (Ic) (Max)	100 mA
Vce Saturation (Max) @ Ib, Ic	650mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	420 @ 2mA, 5V
Power - Max	500 mW
Frequency - Transition	100MHz
Operating Temperature	150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Supplier Device Package	TO-92-3
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected
Part Status	Obsolete

Substitute Part Grouping Explanation

Substitute selection for transistors in the BJTs, PNP category is based strictly on matching the following key electrical and mechanical parameters: transistor type, collector-emitter breakdown voltage, collector current rating, collector-emitter saturation voltage, cutoff current, DC current gain, power dissipation, transition frequency, operating temperature range, mounting type, and package/case compatibility. Substitution validity is narrowly restricted to parts matching these fields as explicitly provided.

Parameter Comparison

Manufacturer Part Number	Transistor Type	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	Vce Saturation (Max)	DC Current Gain (hFE) (Min)	Power - Max	Frequency - Transition	Operating Temperature	Mounting Type	Package / Case	RoHS Status	REACH Status	Part Status
BC557C,126	PNP	45 V	100 mA	650mV @ 5mA, 100mA	420 @ 2mA, 5V	500 mW	100MHz	150°C (TJ)	Through Hole	TO-226-3, TO-92-3	ROHS3 Compliant	REACH Unaffected	Obsolete
2N3906TA	PNP	40 V	200 mA	400mV @ 5mA, 50mA	100 @ 10mA, 1V	625 mW	250MHz	-55°C ~ 150°C (TJ)	Through Hole	TO-226-3, TO-92-3	ROHS3 Compliant	REACH Unaffected	Active
2N3906TAR	PNP	40 V	200 mA	400mV @ 5mA, 50mA	100 @ 10mA, 1V	625 mW	250MHz	-55°C ~ 150°C (TJ)	Through Hole	TO-226-3, TO-92-3	ROHS3 Compliant	REACH Unaffected	Active
BC557BTF	PNP	45 V	100 mA	650mV @ 5mA, 100mA	200 @ 2mA, 5V	500 mW	150MHz	150°C (TJ)	Through Hole	TO-226-3, TO-92-3	ROHS3 Compliant	REACH Unaffected	Active
BC557BTA	PNP	45 V	100 mA	650mV @ 5mA, 100mA	200 @ 2mA, 5V	500 mW	150MHz	150°C (TJ)	Through Hole	TO-226-3, TO-92-3	ROHS3 Compliant	REACH Unaffected	Active
2N4403TA	PNP	40 V	600 mA	750mV @ 50mA, 500mA	100 @ 150mA, 2V	625 mW	200MHz	-55°C ~ 150°C (TJ)	Through Hole	TO-226-3, TO-92-3	ROHS3 Compliant	REACH Unaffected	Active
BC557ATA	PNP	45 V	100 mA	650mV @ 5mA, 100mA	110 @ 2mA, 5V	500 mW	150MHz	150°C (TJ)	Through Hole	TO-226-3, TO-92-3	-	-	Active

Engineering Selection Recommendations

Selection of substitute transistors for BC557C,126 should exclusively consider alternatives with matching or higher compliance and certification standards, including ROHS3 and REACH unaffected status. The original part is discontinued (obsolete). Substitute components listed with an "Active" part status and equivalent certification are suitable for direct use in legacy or new designs requiring transistors within the BJTs, PNP category and TO-92-3 mechanical format.

Frequently Asked Questions (FAQ)

Q1: Which electrical parameters must match when substituting a PNP BJT transistor like BC557C,126?
A1: Substitution requires matching transistor type, maximum voltage between collector and emitter, collector current rating, collector-emitter saturation voltage, DC current gain, power dissipation, transition frequency, operating temperature, mounting type, and package.

Q2: Are active substitutes compatible with TO-92-3 through-hole mounting?
A2: All listed substitutes share the TO-92-3 (TO-226-3) through-hole package specification, ensuring mechanical compatibility for PCB or prototyping use.

Q3: Is RoHS3 and REACH compliance maintained in substitute options?
A3: Substitute transistors with explicit "ROHS3 Compliant" and "REACH Unaffected" status maintain required environmental and regulatory compliance for manufacturing and distribution.

Q4: Why is it necessary to select a substitute with matching part status and certifications?
A4: The original BC557C,126 is obsolete. Selecting parts with "Active" status and identical certifications is essential to ensure availability, compliance, and reliability for new designs and ongoing maintenance.

Q5: Do substitute parts maintain similar electrical characteristics compared to BC557C,126?
A5: Substitute options are selected strictly based on provided key parameters, enabling equivalent performance in PNP BJT applications with similar collector-emitter voltage ratings, collector current capacity, and mechanical fit.

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