BC337-112 Equivalent & Substitute Parts Reference

Part Overview

The BC337-112 is an NPN bipolar junction transistor manufactured by NXP USA Inc., designed for small-signal switching and amplification applications. It features a maximum collector current of 500 mA, collector-emitter breakdown voltage of 45 V, and a transition frequency of 100 MHz in a TO-92-3 through-hole package.

The BC337-112 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems and applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	500	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	700 mV @ 50 mA, 500 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 100 mA, 1 V	—
Power - Max	625	mW
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the BC337-112 is determined by strict electrical and mechanical parameter matching within the NPN bipolar transistor category. The following parameters establish the substitution criteria:

Critical Matching Parameters:

Transistor polarity: NPN
Collector-emitter breakdown voltage: 45 V (minimum requirement)
Package type: TO-92-3 through-hole configuration
Mounting type: Through hole
DC current gain (hFE): minimum 100 @ 100 mA, 1 V
Transition frequency: 100 MHz
Maximum power dissipation: 625 mW
Operating temperature range: 150°C (TJ)

Allowable Variation:

Collector current (Ic) maximum: Equal to or greater than 500 mA
Vce saturation: Equal to or less than 700 mV @ specified conditions
Collector cutoff current (ICBO): Equal to or less than 100 nA

Substitute parts must meet or exceed all critical parameters and remain within allowable variations to ensure functional and thermal compatibility in existing circuit designs.

Parameter Comparison

Parameter	BC337-112 (Main Part)	BC33716BU (Substitute)	Compatibility
Manufacturer	NXP USA Inc.	Fairchild Semiconductor	Different manufacturer
Product Status	Obsolete	Active	Substitute is in active production
Transistor Type	NPN	NPN	Match
Current - Collector (Ic) Max	500 mA	800 mA	Substitute exceeds requirement
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	Match
Vce Saturation (Max) @ Ib, Ic	700 mV @ 50 mA, 500 mA	700 mV @ 50 mA, 500 mA	Match
Current - Collector Cutoff (Max)	100 nA	100 nA	Match
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 100 mA, 1 V	100 @ 100 mA, 1 V	Match
Power - Max	625 mW	625 mW	Match
Frequency - Transition	100 MHz	100 MHz	Match
Operating Temperature (TJ)	150°C	150°C	Match
Mounting Type	Through Hole	Through Hole	Match
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	Match

Engineering Selection Recommendations

The BC33716BU manufactured by Fairchild Semiconductor is a direct substitute for the obsolete BC337-112. Selection of this substitute is based on the following engineering criteria:

Electrical Compatibility: All critical electrical parameters match or exceed the BC337-112 specifications. The BC33716BU provides a maximum collector current of 800 mA, which exceeds the 500 mA requirement of the original part, offering improved current handling capability without compromising circuit performance.

Package and Mounting Compatibility: Both parts utilize the TO-92-3 through-hole package with identical lead configuration (TO-226AA formed leads), ensuring direct mechanical and electrical compatibility in existing PCB layouts without design modification.

Product Status and Supply: The BC33716BU is in active production status with substantial inventory availability (73,196 pieces), whereas the BC337-112 is obsolete. This substitution ensures long-term supply chain continuity and reduces procurement risk.

Compliance and Regulatory Status: Both parts carry identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications, maintaining regulatory compliance for export and trade purposes.

Frequently Asked Questions (FAQ)

Q: Can the BC33716BU be used as a direct replacement for the BC337-112 without circuit modification?

A: Yes. The BC33716BU meets all electrical and mechanical specifications of the BC337-112. The higher maximum collector current (800 mA vs. 500 mA) does not require circuit modification and provides additional design margin.

Q: Are there any thermal considerations when substituting the BC33716BU for the BC337-112?

A: Both parts have identical maximum power dissipation (625 mW) and operating temperature ratings (150°C TJ). Thermal performance is equivalent, and existing thermal management provisions remain adequate.

Q: Does the TO-92-3 package pinout differ between the BC337-112 and BC33716BU?

A: No. Both parts use the standard TO-92-3 (TO-226AA) package with identical lead assignments: Base (B), Collector (C), and Emitter (E). Pin-for-pin compatibility is confirmed.

Q: What is the significance of the higher collector current rating on the BC33716BU?

A: The BC33716BU's 800 mA maximum collector current exceeds the BC337-112's 500 mA rating. This provides additional operational headroom and allows the substitute to handle higher current demands without saturation, improving circuit reliability in applications approaching the original part's current limits.

Q: Are there any differences in DC current gain (hFE) between these parts?

A: No. Both parts specify a minimum DC current gain of 100 @ 100 mA, 1 V. Amplification characteristics are identical.

Q: How does the active production status of the BC33716BU affect long-term availability?

A: The BC33716BU is in active production, ensuring consistent availability and stable pricing compared to the obsolete BC337-112. This substitution eliminates supply chain discontinuity risks associated with end-of-life components.

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