BC33716 Equivalent & Substitute Parts

Part Overview

The BC33716 is an NPN bipolar junction transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 800 mA maximum collector current. This through-hole TO-92-3 package device is designed for small-signal switching and amplification applications with a maximum power dissipation of 625 mW and transition frequency of 100 MHz.

The BC33716 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and redesign applications where the original part is no longer readily procurable from the original manufacturer.

Key Parameters

Parameter	BC33716 Specification
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	45 V
Current - Collector (Ic) (Max)	800 mA
Power - Max	625 mW
Frequency - Transition	100 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 1V
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA
Operating Temperature (TJ)	150°C
Mounting Type	Through Hole
Package / Case	TO-92-3 (TO-226AA)

Substitute Part Grouping Explanation

Substitute parts for the BC33716 are classified into two categories based on electrical and mechanical parameter alignment:

Parametric Equivalent: Parts that match all critical electrical specifications and package configuration, enabling direct replacement without circuit modification.

Similar Equivalent: Parts that maintain the same transistor type (NPN), voltage rating, and through-hole mounting but may exceed the original specifications in current capacity, power dissipation, or frequency response. These parts are functionally compatible but operate with enhanced performance margins.

The substitution logic is based on the following key parameters:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 45 V minimum
Current - Collector (Ic) (Max): 800 mA minimum
Mounting Type: Through Hole
Package Compatibility: TO-92-3 or TO-92 compatible

Parameter Comparison

Parameter	BC33716 (onsemi)	BC33716BU (Fairchild)	ZTX450 (Diodes Inc.)
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V
Current - Collector (Ic) (Max)	800 mA	800 mA	1 A
Power - Max	625 mW	625 mW	1 W
Frequency - Transition	100 MHz	100 MHz	150 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 1V	100 @ 100mA, 1V	100 @ 150mA, 10V
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	250mV @ 15mA, 150mA
Current - Collector Cutoff (Max)	100nA	100nA	100nA
Operating Temperature (TJ)	150°C	150°C	-55°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	E-Line (TO-92 compatible)
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

BC33716BU (Fairchild Semiconductor): This part is a parametric equivalent offering identical electrical specifications and package configuration to the BC33716. The BC33716BU maintains active product status with established supply chain availability. This part is suitable for direct substitution in all applications where the BC33716 was originally specified.

ZTX450 (Diodes Incorporated): This part is a similar equivalent that exceeds the BC33716 specifications in collector current capacity (1 A vs. 800 mA), power dissipation (1 W vs. 625 mW), and transition frequency (150 MHz vs. 100 MHz). The ZTX450 operates across an extended temperature range (-55°C to 200°C) compared to the BC33716 (150°C maximum). The ZTX450 features improved saturation voltage characteristics (250mV vs. 700mV at specified conditions). This part is compatible with through-hole TO-92 mounting and maintains active product status with RoHS3 compliance certification. The ZTX450 is suitable for applications requiring enhanced performance margins or extended operating temperature ranges.

Both substitute parts maintain the same transistor type (NPN), voltage rating (45 V), and through-hole mounting configuration as the original BC33716, ensuring mechanical and electrical compatibility within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can BC33716BU be used as a direct replacement for BC33716?

A: Yes. The BC33716BU is a parametric equivalent with identical electrical specifications and package configuration. All electrical parameters, including collector current, voltage rating, power dissipation, frequency response, and saturation characteristics, match the BC33716 specification. The BC33716BU is suitable for direct substitution without circuit modification.

Q: What are the advantages of using ZTX450 instead of BC33716?

A: The ZTX450 provides enhanced performance specifications including higher collector current capacity (1 A vs. 800 mA), increased power dissipation capability (1 W vs. 625 mW), higher transition frequency (150 MHz vs. 100 MHz), and extended operating temperature range (-55°C to 200°C vs. 150°C maximum). The ZTX450 also features lower saturation voltage (250mV vs. 700mV), reducing power loss in switching applications. These enhancements provide greater design margin and performance headroom.

Q: Are there package compatibility considerations between BC33716 and ZTX450?

A: Both parts use through-hole mounting in TO-92 compatible packages. The BC33716 uses TO-92-3 (TO-226AA) package, while the ZTX450 uses E-Line package designated as TO-92 compatible. Both packages have identical pin configurations and footprints, enabling mechanical interchangeability on standard through-hole PCB layouts.

Q: What is the product status significance for component selection?

A: The BC33716 is classified as obsolete, indicating the original manufacturer (onsemi) has discontinued production. BC33716BU (Fairchild Semiconductor) and ZTX450 (Diodes Incorporated) maintain active product status, ensuring continued availability from authorized distributors and established supply chain support for current and future production requirements.

Q: Are there compliance or certification differences between the substitute parts?

A: BC33716BU carries standard REACH Unaffected and EAR99 ECCN classifications matching the original BC33716. ZTX450 additionally carries RoHS3 compliance certification, indicating compliance with Restriction of Hazardous Substances regulations. Both parts maintain Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity requirements during storage and handling.

Q: Can ZTX450 be used in all applications designed for BC33716?

A: The ZTX450 is functionally compatible with BC33716 applications due to matching transistor type, voltage rating, and through-hole mounting. The enhanced specifications of ZTX450 (higher current, power, and frequency) provide performance margin without creating incompatibility. Applications requiring the specific saturation voltage or thermal characteristics of the BC33716 should verify ZTX450 performance in the target circuit before production implementation.

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