BC337-16 B1G Equivalent & Substitute Parts

Part Overview

The BC337-16 B1G is an NPN bipolar junction transistor manufactured by Taiwan Semiconductor Corporation, designed for general-purpose switching and amplification applications. Rated for 45 V collector-emitter breakdown voltage and 800 mA maximum collector current, this device operates across a wide temperature range from -55°C to 150°C. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility within specified electrical and mechanical parameters. Substitute parts must satisfy the same voltage, current, power dissipation, and package requirements to ensure direct replacement capability.

Key Parameters

Parameter	BC337-16 B1G	Unit
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, 5V	—
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BC337-16 B1G is determined by strict alignment of electrical and mechanical parameters within the following criteria:

Primary Substitution Parameters:

Transistor Type: NPN (mandatory match)
Voltage - Collector Emitter Breakdown (Max): Equal to or greater than 45 V
Current - Collector (Ic) (Max): Equal to or greater than 800 mA
Power - Max: Equal to or greater than 625 mW
Mounting Type: Through Hole (mandatory match)
Package / Case: TO-92-3 or compatible form factor

Secondary Compatibility Parameters:

DC Current Gain (hFE): Minimum 100 at specified operating point
Vce Saturation: Lower values indicate improved switching performance
Frequency - Transition: Equal to or greater than 100 MHz
Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Substitute parts are grouped based on whether they meet, exceed, or fall short of these parameters. Parts that exceed specifications remain functionally compatible for the BC337-16 B1G application space.

Parameter Comparison

Parameter	BC337-16 B1G	KSC1008YBU	ZTX450	Unit
Transistor Type	NPN	NPN	NPN	—
Voltage - Collector Emitter Breakdown (Max)	45	60	45	V
Current - Collector (Ic) (Max)	800	700	1000	mA
Power - Max	625	800	1000	mW
Frequency - Transition	100	50	150	MHz
DC Current Gain (hFE) (Min)	100 @ 100mA, 5V	120 @ 50mA, 2V	100 @ 150mA, 10V	—
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	400mV @ 50mA, 500mA	250mV @ 15mA, 150mA	—
Operating Temperature (Max)	150	150	200	°C
Operating Temperature (Min)	-55	Not specified	-55	°C
Mounting Type	Through Hole	Through Hole	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	E-Line-3 (TO-92 compatible)	—
Product Status	Obsolete	Active	Active	—
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	—

Engineering Selection Recommendations

ZTX450 (Diodes Incorporated) is the primary substitute for BC337-16 B1G applications. This part exceeds all critical electrical parameters: 1 A maximum collector current (versus 800 mA), 1 W power dissipation (versus 625 mW), and 150 MHz transition frequency (versus 100 MHz). The ZTX450 maintains identical 45 V collector-emitter breakdown voltage and extends the operating temperature range to -55°C to 200°C. The E-Line-3 package is mechanically compatible with TO-92 form factor requirements. Both parts carry ROHS3 compliance and REACH unaffected status. The ZTX450 is currently in active production with 1600 units in stock.

KSC1008YBU (Fairchild Semiconductor) serves as a secondary substitute with specific application constraints. This part meets the NPN type and TO-92-3 package requirements with higher voltage rating (60 V) and improved power dissipation (800 mW). However, the maximum collector current is 700 mA, which falls below the BC337-16 B1G specification of 800 mA. The transition frequency of 50 MHz is also lower than the original 100 MHz specification. The KSC1008YBU is suitable only for applications where collector current does not exceed 700 mA and frequency response requirements are less stringent. This part is currently in active production with 135885 units in stock.

Selection between ZTX450 and KSC1008YBU depends on application current and frequency requirements. For applications requiring full parameter compatibility with the BC337-16 B1G, ZTX450 is the appropriate choice. For current-limited applications below 700 mA, KSC1008YBU provides an alternative with enhanced voltage margin.

Frequently Asked Questions (FAQ)

Q: Can the KSC1008YBU directly replace the BC337-16 B1G in all applications?

A: No. The KSC1008YBU has a maximum collector current rating of 700 mA, which is 100 mA below the BC337-16 B1G specification of 800 mA. Applications requiring collector currents between 700 mA and 800 mA cannot use the KSC1008YBU. Additionally, the transition frequency is 50 MHz compared to 100 MHz for the original part. Use KSC1008YBU only in applications where collector current remains below 700 mA and frequency response is not critical.

Q: Is the ZTX450 a direct pin-compatible replacement?

A: The ZTX450 uses an E-Line-3 package, which is mechanically compatible with TO-92 form factor. Pin configuration and lead spacing are compatible with standard TO-92 PCB layouts. However, the E-Line package may have slightly different physical dimensions. Verify PCB footprint compatibility before assembly.

Q: What is the significance of the higher power rating on substitute parts?

A: The ZTX450 (1 W) and KSC1008YBU (800 mW) both exceed the BC337-16 B1G power rating of 625 mW. Higher power ratings indicate greater thermal capability and margin for transient conditions. This does not change the application requirements but provides additional design margin.

Q: Why does the BC337-16 B1G show as obsolete?

A: The BC337-16 B1G is classified as obsolete by the manufacturer. Although 1107 units remain in stock, new production has ceased. The ZTX450 and KSC1008YBU are both in active production status, ensuring long-term availability for new designs.

Q: Are there temperature range differences between substitutes?

A: The BC337-16 B1G operates from -55°C to 150°C. The ZTX450 extends this range to -55°C to 200°C, providing additional high-temperature capability. The KSC1008YBU specifies only a maximum temperature of 150°C without a documented minimum temperature. For applications requiring the full -55°C to 150°C range, ZTX450 is the preferred substitute.

Q: What does ROHS3 compliance mean for substitution?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. Both the BC337-16 B1G and ZTX450 carry ROHS3 compliance. The KSC1008YBU compliance status is not specified in available data. For applications requiring documented ROHS3 compliance, ZTX450 is the appropriate choice.

Q: Can I use the ZTX450 in a circuit designed for 100 mA collector current?

A: Yes. The ZTX450 is rated for 1 A maximum collector current, so it operates safely at 100 mA. The higher current rating provides design margin without affecting circuit operation at lower currents.

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