BC328-16-AP Equivalent & Substitute Parts

Part Overview

The BC328-16-AP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 800 mA, collector-emitter breakdown voltage of 25 V, and maximum power dissipation of 625 mW in a Through Hole TO-92 package.

The BC328-16-AP 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 applications utilizing this transistor.

Key Parameters

Parameter	BC328-16-AP
Transistor Type	PNP
Current - Collector (Ic) (Max)	800 mA
Voltage - Collector Emitter Breakdown (Max)	25 V
Power - Max	625 mW
Frequency - Transition	260 MHz
DC Current Gain (hFE) (Min)	100 @ 100mA, 1V
Operating Temperature Range	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-92-3 (TO-226AA)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the BC328-16-AP is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor polarity must be PNP
Maximum collector current must equal or exceed 800 mA
Maximum collector-emitter breakdown voltage must equal or exceed 25 V
Maximum power dissipation must equal or exceed 625 mW
DC current gain (hFE) must meet or exceed 100 at comparable operating points
Operating temperature range must encompass the application requirements

Mechanical Compatibility Criteria:

Mounting type must be Through Hole
Package must be TO-92 or TO-92 compatible form factor
Lead configuration must support direct board-level substitution

The ZTX549STZ meets all substitution criteria with enhanced electrical specifications and active product status.

Parameter Comparison

Parameter	BC328-16-AP	ZTX549STZ	Compatibility
Transistor Type	PNP	PNP	Match
Current - Collector (Ic) (Max)	800 mA	1 A	Substitute exceeds requirement
Voltage - Collector Emitter Breakdown (Max)	25 V	30 V	Substitute exceeds requirement
Power - Max	625 mW	1 W	Substitute exceeds requirement
Frequency - Transition	260 MHz	100 MHz	Substitute lower; application dependent
DC Current Gain (hFE) (Min)	100 @ 100mA, 1V	100 @ 500mA, 2V	Comparable minimum gain
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 200°C	Substitute exceeds range
Mounting Type	Through Hole	Through Hole	Match
Package / Case	TO-92-3	E-Line-3 (TO-92 compatible)	Compatible form factor
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match

Engineering Selection Recommendations

BC328-16-AP Status: Obsolete product with 1073 units in current inventory.

ZTX549STZ Status: Active product with 20200 units in current inventory.

The ZTX549STZ is a direct substitute for the BC328-16-AP based on electrical parameter compatibility and mechanical form factor alignment. The substitute device provides enhanced specifications across collector current (1 A vs. 800 mA), breakdown voltage (30 V vs. 25 V), and power dissipation (1 W vs. 625 mW). Both devices maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

The transition frequency of the ZTX549STZ (100 MHz) is lower than the BC328-16-AP (260 MHz). Applications requiring high-frequency operation above 100 MHz must evaluate this parameter against specific circuit requirements.

The ZTX549STZ supports an extended operating temperature range (-55°C to 200°C junction temperature) compared to the BC328-16-AP (-55°C to 150°C), providing additional thermal margin for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the ZTX549STZ directly replace the BC328-16-AP in existing designs?

A: Yes. The ZTX549STZ meets all electrical and mechanical substitution criteria. Both devices are PNP transistors in TO-92 compatible packages with Through Hole mounting. The substitute provides equal or superior performance across current, voltage, and power specifications.

Q: What is the primary difference between these two transistors?

A: The ZTX549STZ provides higher maximum ratings (1 A collector current, 30 V breakdown voltage, 1 W power) and extended operating temperature range (-55°C to 200°C). The BC328-16-AP offers higher transition frequency (260 MHz vs. 100 MHz). Selection depends on application frequency requirements and thermal operating conditions.

Q: Are there package compatibility concerns?

A: No. The ZTX549STZ is supplied in E-Line-3 package with formed leads, which is TO-92 compatible. Both devices support Through Hole mounting with identical lead spacing and configuration, enabling direct board-level substitution without layout modifications.

Q: Do both devices meet current compliance requirements?

A: Yes. Both the BC328-16-AP and ZTX549STZ are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity). Both carry EAR99 ECCN classification.

Q: Which device should be selected for new designs?

A: The ZTX549STZ is recommended for new designs. It is an active product with robust supply availability (20200 units in stock), whereas the BC328-16-AP is obsolete. The ZTX549STZ provides superior electrical specifications and extended operating temperature range without performance compromise for most general-purpose switching and amplification applications.

Q: Is the lower transition frequency of the ZTX549STZ a limitation?

A: The 100 MHz transition frequency of the ZTX549STZ is suitable for general-purpose switching applications and low-to-mid frequency amplification circuits. Applications requiring operation above 100 MHz must verify frequency response requirements against specific circuit specifications.

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