BC337ZL1 Equivalent & Substitute Parts

Part Overview

The BC337ZL1 is an NPN bipolar junction transistor manufactured by onsemi, rated for 45V collector-emitter breakdown voltage and 800mA maximum collector current. This through-hole TO-92 package device is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design support and production requirements. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	800	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 100mA, 1V	—
Power - Max	625	mW
Frequency - Transition	210	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226)	—

Substitute Part Grouping Explanation

Substitution of the BC337ZL1 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Transistor Type: NPN
Current - Collector (Ic) Max: 800 mA
Voltage - Collector Emitter Breakdown (Max): 45 V
Vce Saturation (Max) @ Ib, Ic: 700mV @ 50mA, 500mA
Current - Collector Cutoff (Max): 100 nA
DC Current Gain (hFE) Min @ Ic, Vce: 100 @ 100mA, 1V (minimum)
Power - Max: 625 mW
Mounting Type: Through Hole
Package / Case: TO-92-3 (TO-226)

Acceptable Variation Parameters:

Frequency - Transition: 100 MHz or higher (BC337ZL1 specifies 210 MHz)
DC Current Gain (hFE) Min: 100 or higher (higher values acceptable)
Operating Temperature: Maximum of 150°C or higher (BC337ZL1 specifies -55°C to 150°C)
Product Status: Active preferred over obsolete for long-term availability

All identified substitute parts meet or exceed the mandatory electrical specifications of the BC337ZL1 while maintaining identical mechanical compatibility through the TO-92-3 package format.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	hFE Min @ 100mA, 1V	Frequency MHz	Power mW	Package	Status
BC337ZL1	onsemi	800	45	100	210	625	TO-92-3	Obsolete
BC33716TA	Fairchild Semiconductor	800	45	100	100	625	TO-92-3	Active
BC33725BU	Fairchild Semiconductor	800	45	160	100	625	TO-92-3	Active
BC33725TA	onsemi	800	45	160	100	625	TO-92-3	Active
BC33725TAR	onsemi	800	45	160	100	625	TO-92-3	Active
BC33725TFR	Fairchild Semiconductor	800	45	160	100	625	TO-92-3	Active
BC33740TA	onsemi	800	45	250	100	625	TO-92-3	Active
BC337-25-AP	Micro Commercial Co	800	45	160	210	625	TO-92-3	Obsolete

Engineering Selection Recommendations

Primary Substitutes (Active Status, RoHS3 Compliant):

BC33725TA and BC33725TAR (onsemi) are direct functional equivalents with active product status and RoHS3 compliance. Both devices maintain identical electrical ratings to the BC337ZL1 with enhanced DC current gain (hFE Min = 160 vs. 100). onsemi manufacturing continuity provides supply chain consistency for applications currently using BC337ZL1.

BC33740TA (onsemi) provides the highest DC current gain (hFE Min = 250) while maintaining all other electrical specifications. This device is suitable for applications where increased current amplification is beneficial or neutral to circuit operation.

Secondary Substitutes (Active Status, Fairchild Semiconductor):

BC33725BU and BC33725TFR (Fairchild Semiconductor) offer active product status with identical electrical performance to onsemi BC33725 variants. BC33725BU is supplied in bulk packaging, while BC33725TFR is supplied in cut tape format. Both devices provide RoHS compliance and equivalent functionality.

BC33716TA (Fairchild Semiconductor) maintains the original hFE Min specification of 100, matching the BC337ZL1 baseline current gain requirement. This device is appropriate for applications with strict gain specifications.

Obsolete Alternatives:

BC337-25-AP (Micro Commercial Co) retains the 210 MHz transition frequency of the BC337ZL1 and RoHS3 compliance but carries obsolete product status. This part is suitable only for legacy system maintenance where existing inventory exists.

Frequently Asked Questions (FAQ)

Q: Can BC33725TA directly replace BC337ZL1 in existing designs?

A: Yes. BC33725TA meets all mandatory electrical parameters of BC337ZL1 (800mA Ic, 45V Vce(br), 625mW power, TO-92-3 package). The higher DC current gain (160 vs. 100) is a performance enhancement that does not compromise compatibility. Physical pin configuration and package dimensions are identical.

Q: What is the difference between BC33725TA and BC33740TA?

A: Both devices are electrically equivalent except for DC current gain. BC33725TA specifies hFE Min of 160, while BC33740TA specifies hFE Min of 250. Selection depends on circuit bias requirements. Higher gain in BC33740TA reduces base current requirements for equivalent collector current.

Q: Why do some substitutes have lower transition frequency (100 MHz vs. 210 MHz)?

A: Transition frequency (fT) is a performance parameter that does not affect substitutability for most applications. The BC337ZL1 specifies 210 MHz; most active substitutes specify 100 MHz. Both frequencies exceed typical small-signal switching requirements. Applications requiring frequencies above 100 MHz should use BC337-25-AP or BC337ZL1 directly.

Q: Are all substitute parts RoHS compliant?

A: Active substitute parts (BC33725TA, BC33725TAR, BC33740TA, BC33725BU, BC33725TFR, BC33716TA) are RoHS3 compliant. The original BC337ZL1 is RoHS non-compliant. BC337-25-AP is RoHS3 compliant but obsolete.

Q: What packaging formats are available for substitutes?

A: BC33725TA and BC33725TAR are supplied in cut tape (CT) format. BC33725BU is supplied in bulk. BC33716TA, BC33725TFR, and BC33740TA packaging formats are specified as cut tape or standard distribution. All maintain identical TO-92-3 physical package dimensions.

Q: Can I use BC33740TA if my circuit is designed for BC337ZL1 with hFE = 100?

A: Yes. BC33740TA with hFE Min = 250 is a superset of BC337ZL1 specifications. Higher current gain reduces base current requirements but does not create incompatibility. Circuit operation remains valid across the full range of specified gain values.

Q: Which substitute offers the best long-term availability?

A: BC33725TA and BC33725TAR (onsemi) and BC33740TA (onsemi) carry active product status from a major manufacturer, providing superior long-term availability compared to obsolete alternatives. Fairchild Semiconductor variants (BC33725BU, BC33725TFR, BC33716TA) also maintain active status.

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