BC548CZL1G Equivalent & Substitute Parts

Part Overview

The BC548CZL1G is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal amplification and switching applications. This component operates at a maximum collector current of 100 mA with a collector-emitter breakdown voltage of 30 V and a maximum power dissipation of 625 mW. The part is housed in a TO-92 through-hole package suitable for through-hole PCB assembly.

The BC548CZL1G is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Power - Max	625	mW
Frequency - Transition	300	MHz
DC Current Gain (hFE) Min @ Ic, Vce	420 @ 2mA, 5V	—
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature Range	-55 to 150	°C

Substitute Part Grouping Explanation

Substitution of the BC548CZL1G is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Criteria:

Transistor type (NPN)
Maximum collector current (100 mA)
Collector-emitter breakdown voltage (30 V)
Transition frequency (300 MHz)
DC current gain minimum specification (hFE ≥ 420 @ 2mA, 5V)

Mechanical Compatibility Criteria:

Through-hole mounting type
TO-92-3 package configuration

Substitution Classification:

Direct Substitutes (BC548CTA, BC549CTA): These parts meet all electrical parameters and package requirements. Both are active products with confirmed inventory availability. BC548CTA is manufactured by Fairchild Semiconductor; BC549CTA is manufactured by onsemi.

Similar Substitute (BC548BTA): This part meets all electrical parameters and package requirements with the exception of DC current gain specification. BC548BTA specifies a minimum hFE of 200 @ 2mA, 5V, which is lower than the BC548CZL1G specification of 420 @ 2mA, 5V. This part is manufactured by Fairchild Semiconductor and is an active product.

Parameter Comparison

Parameter	BC548CZL1G (Main)	BC548CTA	BC549CTA	BC548BTA
Manufacturer	onsemi	Fairchild Semiconductor	onsemi	Fairchild Semiconductor
Product Status	Obsolete	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN
Current - Collector (Ic) Max	100 mA	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	30 V	30 V
Power - Max	625 mW	500 mW	500 mW	500 mW
Frequency - Transition	300 MHz	300 MHz	300 MHz	300 MHz
DC Current Gain (hFE) Min @ Ic, Vce	420 @ 2mA, 5V	420 @ 2mA, 5V	420 @ 2mA, 5V	200 @ 2mA, 5V
Current - Collector Cutoff (Max)	15 nA	15 nA	15 nA	15 nA
Operating Temperature Range	-55 to 150°C	—	—	—
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3
RoHS Status	—	—	ROHS3 Compliant	—

Engineering Selection Recommendations

For Direct Substitution:

BC548CTA and BC549CTA are suitable direct replacements for the BC548CZL1G. Both parts are active products with full electrical parameter equivalence, including matching DC current gain specifications. BC549CTA carries ROHS3 compliance certification and is available in higher inventory quantities (35,685 units). BC548CTA is available from Fairchild Semiconductor with 1,749 units in stock.

For Applications with Relaxed Current Gain Requirements:

BC548BTA is suitable for applications where the minimum DC current gain specification can be reduced from 420 to 200 @ 2mA, 5V. This part maintains all other electrical and mechanical compatibility parameters. BC548BTA is an active product with 9,544 units in stock.

Compliance Considerations:

All substitute parts carry EAR99 export classification and HTSUS code 8541.21.0075. BC549CTA is explicitly ROHS3 compliant. All parts are REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can BC548CTA be used as a direct replacement for BC548CZL1G?

A: Yes. BC548CTA meets all electrical specifications including collector current (100 mA), collector-emitter breakdown voltage (30 V), transition frequency (300 MHz), and DC current gain (420 @ 2mA, 5V). The package configuration (TO-92-3 through-hole) is identical.

Q: What is the difference between BC548CTA and BC549CTA?

A: Both parts are electrically equivalent with identical maximum ratings and DC current gain specifications. The primary difference is manufacturer: BC548CTA is manufactured by Fairchild Semiconductor, while BC549CTA is manufactured by onsemi. BC549CTA carries ROHS3 compliance certification and has significantly higher inventory availability.

Q: Why is BC548BTA listed as a similar substitute rather than a direct substitute?

A: BC548BTA specifies a minimum DC current gain of 200 @ 2mA, 5V, compared to the BC548CZL1G specification of 420 @ 2mA, 5V. This lower gain specification may affect circuit performance in applications with tight gain requirements. All other electrical and mechanical parameters are equivalent.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts (BC548CTA, BC549CTA, BC548BTA) are packaged in TO-92-3 through-hole configuration, identical to the BC548CZL1G. Direct PCB substitution is mechanically compatible.

Q: What is the power dissipation difference between BC548CZL1G and the substitute parts?

A: The BC548CZL1G specifies a maximum power dissipation of 625 mW. All substitute parts (BC548CTA, BC549CTA, BC548BTA) specify 500 mW maximum power dissipation. Applications operating near the 625 mW limit require thermal analysis to confirm compatibility with the lower rating.

Q: Is BC549CTA recommended for new designs?

A: BC549CTA is an active product with ROHS3 compliance, high inventory availability, and full electrical equivalence to BC548CZL1G. It is suitable for new design implementations.

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