BC337-40,116 Equivalent & Substitute Parts

Part Overview

The BC337-40,116 is an NPN bipolar junction transistor manufactured by NXP USA Inc., designed for general-purpose switching and amplification applications. This device operates at 45 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and dissipates up to 625 mW. The part is mounted in a TO-92-3 through-hole package with formed leads.

The BC337-40,116 is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades. Equivalent devices must match the electrical performance envelope and physical package specifications to ensure direct replacement without circuit redesign.

Key Parameters

Parameter	BC337-40,116	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	625	mW
Frequency - Transition	100	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	250 @ 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-226-3, TO-92-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BC337-40,116 is determined by the following critical parameters:

Voltage Rating: The collector-emitter breakdown voltage must equal or exceed 45 V to maintain circuit safety margins and prevent device failure under maximum operating conditions.

Current Rating: The maximum collector current must support the circuit's current demands. The BC337-40,116 specifies 500 mA maximum. Substitute parts with equal or higher current ratings are acceptable.

Power Dissipation: All substitute parts must support 625 mW maximum power dissipation to ensure thermal compatibility within the TO-92-3 package.

DC Current Gain (hFE): The minimum DC current gain at specified test conditions determines biasing behavior. Substitutes with hFE values at or above the original specification maintain circuit gain characteristics.

Vce Saturation: Saturation voltage affects switching speed and power loss. Substitutes with equal or lower saturation voltage are acceptable.

Package and Mounting: All substitutes must use TO-92-3 through-hole package with formed leads to ensure mechanical and electrical compatibility with existing PCB layouts.

Compliance: All substitute parts must maintain RoHS3 compliance and REACH unaffected status to meet regulatory requirements.

Substitute parts are grouped into two categories based on electrical performance:

Category A (Direct Replacement - Higher Current Capability): BC33725TA, BC33725TAR, BC33725TFR, and BC33716TA. These devices maintain the 45 V voltage rating and 625 mW power rating while offering equal or higher collector current ratings (600–800 mA) and compatible saturation characteristics.

Category B (Reduced Current Capability): 2N3904TA, 2N3904TF, and 2N3904TFR. These devices operate at 40 V breakdown voltage with reduced maximum collector current (200 mA). Use only in applications where circuit current requirements do not exceed 200 mA.

Category C (Matched Current Capability): 2N4401TA, 2N4401TF, and 2N4401TFR. These devices operate at 40 V breakdown voltage with 600 mA maximum collector current, matching the original part's current handling capability.

Parameter Comparison

Part Number	Manufacturer	Vce(BR) (V)	Ic Max (mA)	Power Max (mW)	hFE Min @ Ic, Vce	Vce Sat Max @ Ib, Ic	fT (MHz)	Temp Range (°C)	Status
BC337-40,116	NXP USA Inc.	45	500	625	250 @ 100mA, 1V	700mV @ 50mA, 500mA	100	150	Obsolete
2N3904TA	onsemi	40	200	625	100 @ 10mA, 1V	300mV @ 5mA, 50mA	300	-55 to 150	Active
2N3904TF	onsemi	40	200	625	100 @ 10mA, 1V	300mV @ 5mA, 50mA	300	-55 to 150	Active
2N3904TFR	onsemi	40	200	625	100 @ 10mA, 1V	300mV @ 5mA, 50mA	300	-55 to 150	Active
2N4401TA	onsemi	40	600	625	100 @ 150mA, 1V	750mV @ 50mA, 500mA	250	-55 to 150	Active
2N4401TF	Fairchild Semiconductor	40	600	625	100 @ 150mA, 1V	750mV @ 50mA, 500mA	250	-55 to 150	Active
2N4401TFR	onsemi	40	600	625	100 @ 150mA, 1V	750mV @ 50mA, 500mA	250	-55 to 150	Active
BC33716TA	Fairchild Semiconductor	45	800	625	100 @ 100mA, 1V	700mV @ 50mA, 500mA	100	150	Active
BC33725TA	onsemi	45	800	625	160 @ 100mA, 1V	700mV @ 50mA, 500mA	100	150	Active
BC33725TAR	onsemi	45	800	625	160 @ 100mA, 1V	700mV @ 50mA, 500mA	100	150	Active
BC33725TFR	Fairchild Semiconductor	45	800	625	160 @ 100mA, 1V	700mV @ 50mA, 500mA	100	150	Active

Engineering Selection Recommendations

For Direct Replacement with Enhanced Current Capability:

Select BC33725TA, BC33725TAR, or BC33725TFR when the circuit design permits higher collector current handling. These parts maintain the original 45 V voltage rating and 100 MHz transition frequency. BC33725TA and BC33725TAR are manufactured by onsemi with high inventory availability (65,300 and 10,204 units respectively). BC33725TFR is supplied by Fairchild Semiconductor with 16,865 units in stock. All three variants are active products with RoHS3 compliance and REACH unaffected status.

For Voltage-Matched Substitution:

BC33716TA provides an alternative with 45 V rating and 800 mA current capability. Manufactured by Fairchild Semiconductor with 14,100 units available, this part maintains compatibility with the original voltage specification and saturation characteristics.

For Reduced Current Applications:

2N4401TA, 2N4401TF, and 2N4401TFR are suitable when circuit current requirements do not exceed 600 mA. These parts operate at 40 V breakdown voltage, which is 5 V lower than the original specification. Use only in applications where the reduced voltage margin does not compromise circuit safety. 2N4401TA (onsemi, 89,662 units) and 2N4401TFR (onsemi, 24,100 units) offer high availability. All variants are active products with full compliance certifications.

For Low-Current Applications Only:

2N3904TA, 2N3904TF, and 2N3904TFR are restricted to circuits requiring maximum 200 mA collector current. The 40 V voltage rating and reduced current gain (100 vs. 250 minimum) make these parts unsuitable for applications matching the original BC337-40,116 specifications. 2N3904TFR offers the highest inventory (22,042 units). These parts are active products with extended temperature range (-55°C to 150°C) and full compliance.

All recommended substitutes are active products with RoHS3 compliance and REACH unaffected status, ensuring regulatory compliance and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can I use 2N3904 series transistors as a direct replacement for BC337-40,116?

A: No. The 2N3904 series has a maximum collector current of 200 mA, which is insufficient for circuits designed for the BC337-40,116's 500 mA rating. Additionally, the 40 V breakdown voltage is 5 V lower than the original specification. Use 2N3904 only in applications with current requirements below 200 mA.

Q: What is the difference between BC33725TA, BC33725TAR, and BC33725TFR?

A: All three parts are electrically identical NPN transistors with 45 V breakdown voltage, 800 mA maximum collector current, and 625 mW power dissipation. The differences are manufacturer (onsemi for TA and TAR; Fairchild for TFR) and packaging designation (TA and TAR indicate tape and reel; TFR indicates tape and reel from Fairchild). Select based on supplier availability and procurement requirements.

Q: Can I substitute a 2N4401 for BC337-40,116 in a high-voltage application?

A: No. The 2N4401 series operates at 40 V breakdown voltage, which is 5 V lower than the BC337-40,116. In applications requiring the full 45 V rating, use BC33725TA, BC33725TAR, BC33725TFR, or BC33716TA instead.

Q: Are all substitute parts in the same TO-92-3 package?

A: Yes. All substitute parts listed use the TO-92-3 through-hole package with formed leads, ensuring mechanical compatibility with existing PCB layouts. No board redesign is required.

Q: What is the significance of the hFE (DC Current Gain) difference between BC337-40,116 and BC33725 series?

A: The BC337-40,116 specifies a minimum hFE of 250 at 100 mA and 1 V, while BC33725 series specifies 160 at the same conditions. The lower hFE in BC33725 requires slightly higher base current for the same collector current. In most applications, this difference is negligible. Verify biasing calculations if the circuit operates near the hFE specification limit.

Q: Which substitute offers the best inventory availability?

A: 2N3904TFR (onsemi) has the highest inventory at 22,042 units. For parts matching the original voltage and current specifications, BC33725TA (onsemi) offers 65,300 units in stock.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: Can I use BC33716TA instead of BC33725TA?

A: Yes. Both parts have identical electrical specifications (45 V, 800 mA, 625 mW, 100 MHz) and the same TO-92-3 package. The primary difference is manufacturer (Fairchild for BC33716TA; onsemi for BC33725TA). Select based on supplier availability and procurement preferences.

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