BC337-025G Equivalent & Substitute Parts Reference

Part Overview

The BC337-025G is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 45 V collector-emitter breakdown voltage, 800 mA maximum collector current, and 625 mW power dissipation in a Through Hole TO-92 package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	800	mA
Power - Max	625	mW
Frequency - Transition	210	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	160 @ 100mA, 1V	—
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-226)	—

Substitute Part Grouping Explanation

Substitution of the BC337-025G is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitute relationships:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown (Max): ≥ 45 V
Current - Collector (Ic) (Max): ≥ 800 mA
Power - Max: ≥ 625 mW
Mounting Type: Through Hole (for direct mechanical compatibility)
Package / Case: TO-92-3 or TO-226 compatible

Secondary Compatibility Factors:

DC Current Gain (hFE) (Min): ≥ 160 @ 100mA, 1V
Vce Saturation (Max): ≤ 700mV @ 50mA, 500mA
Operating Temperature Range: Must encompass -55°C to 150°C

Substitute parts are grouped into two categories:

Direct Substitutes (Electrical and Mechanical Equivalence): Parts meeting all primary criteria with identical or superior electrical performance and Through Hole TO-92 packaging.

Similar Substitutes (Functional Equivalence with Parameter Variations): Parts meeting core electrical requirements but with variations in transition frequency, current gain, or other secondary parameters. These remain functionally compatible within the BC337-025G application envelope.

Package Variant Substitutes (Surface Mount Alternative): The BC817-25LT1G provides electrical compatibility but uses Surface Mount SOT-23-3 packaging, requiring circuit board redesign.

Parameter Comparison

Parameter	BC337-025G	BC33725BU	BC33716BU	BC33740BU	BC337-25-AP	2N4401BU	ZTX450	BC817-25LT1G
Manufacturer	onsemi	Fairchild Semiconductor	Fairchild Semiconductor	onsemi	Micro Commercial Co	onsemi	Diodes Incorporated	onsemi
Product Status	Obsolete	Active	Active	Active	Obsolete	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V	45 V	45 V	40 V	45 V	45 V
Current - Collector (Ic) (Max)	800 mA	800 mA	800 mA	800 mA	800 mA	600 mA	1 A	500 mA
Power - Max	625 mW	625 mW	625 mW	625 mW	625 mW	625 mW	1 W	300 mW
Frequency - Transition	210 MHz	100 MHz	100 MHz	100 MHz	210 MHz	250 MHz	150 MHz	100 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	160 @ 100mA, 1V	160 @ 100mA, 1V	100 @ 100mA, 1V	250 @ 100mA, 1V	160 @ 100mA, 1V	100 @ 150mA, 1V	100 @ 150mA, 10V	160 @ 100mA, 1V
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	750mV @ 50mA, 500mA	250mV @ 15mA, 150mA	700mV @ 50mA, 500mA
Operating Temperature Range	-55 to 150°C	150°C (TJ)	150°C (TJ)	150°C (TJ)	-55 to 150°C	-55 to 150°C	-55 to 200°C	-65 to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount
Package / Case	TO-92-3 (TO-226)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	E-Line-3 (TO-92 compatible)	SOT-23-3 (TO-236)
RoHS Status	Not specified	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Replacement (No Circuit Redesign Required):

BC33725BU, BC33716BU, and BC33740BU are the primary substitutes for the BC337-025G. All three parts are manufactured by onsemi or Fairchild Semiconductor with Active product status, ensuring long-term availability and supply chain stability. These parts maintain identical electrical specifications for voltage, current, and power ratings, with Through Hole TO-92-3 packaging that provides direct mechanical compatibility.

BC33725BU and BC33740BU are preferred selections due to their Active status and ROHS3 compliance certification. BC33740BU offers superior DC current gain (250 @ 100mA, 1V) compared to the original specification (160 @ 100mA, 1V), providing enhanced switching performance. BC33725BU maintains the original gain specification while offering equivalent electrical performance.

BC33716BU is functionally equivalent but features a lower DC current gain minimum (100 @ 100mA, 1V), which may require circuit bias adjustments in gain-sensitive applications.

For Applications Requiring Enhanced Performance:

BC337-25-AP provides identical electrical specifications to the BC337-025G, including 210 MHz transition frequency and 160 DC current gain. However, this part is classified as Obsolete, limiting its suitability for new designs requiring long-term component availability.

ZTX450 offers superior current handling (1 A maximum) and power dissipation (1 W), with extended operating temperature range (-55°C to 200°C). This part is suitable for applications requiring higher current capacity or thermal margin. The E-Line-3 package is mechanically compatible with TO-92 footprints.

For Surface Mount Applications:

BC817-25LT1G provides electrical compatibility with reduced power dissipation (300 mW) and current rating (500 mA). This part requires circuit board redesign due to SOT-23-3 Surface Mount packaging. Selection is appropriate only when surface mount technology is specified in the design.

For Current-Limited Applications:

2N4401BU is suitable for applications where maximum collector current is limited to 600 mA. This part features 250 MHz transition frequency, exceeding the original BC337-025G specification. However, the 40 V collector-emitter breakdown voltage is below the 45 V specification, requiring voltage margin verification in the application circuit.

Frequently Asked Questions (FAQ)

Q: Can BC33725BU directly replace BC337-025G without circuit modification?

A: Yes. BC33725BU maintains identical electrical specifications for voltage (45 V), current (800 mA), power (625 mW), and saturation characteristics. The Through Hole TO-92-3 package provides direct mechanical compatibility. No circuit redesign is required.

Q: What is the difference between BC33716BU and BC33740BU?

A: Both parts are electrically equivalent to BC337-025G in voltage, current, and power ratings. The primary difference is DC current gain: BC33716BU specifies 100 @ 100mA, 1V, while BC33740BU specifies 250 @ 100mA, 1V. BC33740BU provides stronger switching performance and is preferred for applications sensitive to base drive requirements.

Q: Why is 2N4401BU listed as a substitute if it has only 40 V breakdown voltage?

A: 2N4401BU meets the core functional requirements for NPN switching transistors with 600 mA current capacity and 625 mW power dissipation. The 40 V rating is 5 V below the BC337-025G specification. This part is suitable only for applications where the actual operating voltage is confirmed to remain below 40 V. Voltage margin verification is required before selection.

Q: Can ZTX450 be used in place of BC337-025G?

A: ZTX450 is functionally compatible with superior electrical performance: 1 A current capacity (vs. 800 mA) and 1 W power dissipation (vs. 625 mW). The E-Line-3 package is mechanically compatible with TO-92 footprints. ZTX450 is suitable for applications requiring higher current or thermal margin. No circuit modification is required for direct substitution.

Q: Is BC817-25LT1G a suitable replacement?

A: BC817-25LT1G provides electrical compatibility but uses Surface Mount SOT-23-3 packaging instead of Through Hole TO-92. This part is suitable only for new designs incorporating surface mount technology. Existing through-hole circuit boards require redesign. The 500 mA current rating and 300 mW power dissipation are reduced compared to BC337-025G, limiting applicability to lower-power circuits.

Q: What is the impact of reduced transition frequency in BC33725BU and BC33716BU?

A: Both parts specify 100 MHz transition frequency compared to BC337-025G at 210 MHz. This reduction affects high-frequency switching performance. For applications operating below 100 MHz, the difference is not significant. Applications requiring switching frequencies above 100 MHz should retain BC337-025G or BC337-25-AP specifications.

Q: Are all substitute parts RoHS3 compliant?

A: BC33740BU, BC33716BU, BC337-25-AP, 2N4401BU, ZTX450, and BC817-25LT1G are all ROHS3 compliant. BC33725BU compliance status is not specified in the provided data. All parts maintain REACH Unaffected status.

Q: What is the inventory status of substitute parts?

A: BC33725BU has the highest inventory (25,400 pcs), followed by BC33716BU (73,196 pcs) and BC817-25LT1G (245,644 pcs). BC33740BU has 5,861 pcs available. All substitute parts are classified as New Original In Stock, ensuring immediate availability for procurement.

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