MMBT2484 NPN Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The MMBT2484 is an NPN bipolar junction transistor manufactured by onsemi, housed in a surface mount SOT-23-3 (TO-236) package. This device is rated for 60 V collector-emitter breakdown voltage and 100 mA maximum collector current with 350 mW power dissipation. The MMBT2484 is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production applications. Substitute parts must maintain electrical compatibility within the specified parameter ranges while offering active product status and current manufacturing availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector-Emitter Breakdown Voltage (Max)	60	V
Collector Current (Max)	100	mA
Power Dissipation (Max)	350	mW
Vce Saturation (Max) @ Ib, Ic	350 mV @ 100 µA, 1 mA	—
DC Current Gain (hFE Min) @ Ic, Vce	100 @ 10 µA, 5 V	—
Collector Cutoff Current (Max)	10	nA
Operating Temperature Range	−55 to +150	°C
Package / Case	SOT-23-3 (TO-236)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitute parts for the MMBT2484 are classified into two categories based on electrical parameter compatibility:

Direct Substitutes (Identical Electrical Specifications): Parts that maintain the same collector-emitter breakdown voltage (60 V), collector current rating (100 mA), and saturation voltage characteristics. These parts are functionally interchangeable with the MMBT2484 in applications where the original specifications are required. Direct substitutes differ only in packaging format (Cut Tape vs. Tape & Reel) or product status (Active vs. Obsolete).

Similar Substitutes (Enhanced or Modified Specifications): Parts that exceed the MMBT2484 specifications in one or more parameters while maintaining compatibility with the SOT-23-3 package and surface mount mounting type. These include devices with higher breakdown voltage (65 V), increased power dissipation (300 mW), or enhanced frequency response (100 MHz transition frequency). Similar substitutes are suitable for applications where the MMBT2484 specifications represent minimum requirements.

Critical Substitution Parameters:

Collector-Emitter Breakdown Voltage: Must equal or exceed 60 V
Collector Current Rating: Must equal or exceed 100 mA
Package Type: Must be SOT-23-3 (TO-236) surface mount
Mounting Type: Must be surface mount
Operating Temperature Range: Must encompass −55 to +150 °C

Parameter Comparison

Part Number	Manufacturer	Product Status	Vce(BR) Max (V)	Ic Max (mA)	Power Max (mW)	hFE Min @ Ic, Vce	Vce Sat Max (mV)	Package	RoHS Status
MMBT2484	onsemi	Obsolete	60	100	350	100 @ 10 µA, 5 V	350 @ 100 µA, 1 mA	SOT-23-3	Not Specified
MMBT2484LT1G	onsemi	Active	60	100	225	250 @ 1 mA, 5 V	350 @ 100 µA, 1 mA	SOT-23-3	ROHS3 Compliant
MMBT2484LT3G	onsemi	Active	60	100	225	250 @ 1 mA, 5 V	350 @ 100 µA, 1 mA	SOT-23-3	ROHS3 Compliant
BC846ALT1G	onsemi	Active	65	100	300	110 @ 2 mA, 5 V	600 @ 5 mA, 100 mA	SOT-23-3	ROHS3 Compliant
BC846ALT3G	onsemi	Active	65	100	300	110 @ 2 mA, 5 V	600 @ 5 mA, 100 mA	SOT-23-3	ROHS3 Compliant
BC846BLT1G	onsemi	Active	65	100	300	200 @ 2 mA, 5 V	600 @ 5 mA, 100 mA	SOT-23-3	ROHS3 Compliant
BC846BLT3G	onsemi	Active	65	100	300	200 @ 2 mA, 5 V	600 @ 5 mA, 100 mA	SOT-23-3	ROHS3 Compliant
MMBT6429LT1G	onsemi	Active	45	200	225	500 @ 100 µA, 5 V	600 @ 5 mA, 100 mA	SOT-23-3	ROHS3 Compliant
SBC846ALT1G	onsemi	Active	65	100	300	110 @ 2 mA, 5 V	600 @ 5 mA, 100 mA	SOT-23-3	ROHS3 Compliant
SBC846BLT1G	onsemi	Active	65	100	300	200 @ 2 mA, 5 V	600 @ 5 mA, 100 mA	SOT-23-3	ROHS3 Compliant
SBC846BLT3G	onsemi	Active	65	100	300	200 @ 2 mA, 5 V	600 @ 5 mA, 100 mA	SOT-23-3	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes for Obsolete MMBT2484:

MMBT2484LT1G and MMBT2484LT3G are direct electrical equivalents of the MMBT2484, maintaining identical collector-emitter breakdown voltage (60 V) and collector current rating (100 mA). Both parts are manufactured by onsemi and are classified as Active products with ROHS3 compliance. The primary difference between these two parts is packaging format: MMBT2484LT1G is supplied in Cut Tape (CT) & Digi-Reel® format, while MMBT2484LT3G is supplied in Tape & Reel (TR) format. Selection between these two should be based on procurement and assembly line requirements. Both parts are suitable for direct replacement in existing MMBT2484 applications without circuit modification.

Similar Substitutes with Enhanced Specifications:

BC846ALT1G, BC846ALT3G, BC846BLT1G, and BC846BLT3G are similar substitutes offering enhanced electrical specifications. These parts feature 65 V collector-emitter breakdown voltage (5 V higher than MMBT2484), 300 mW power dissipation (compared to 350 mW in the original), and 100 MHz transition frequency. The BC846 series variants differ in DC current gain: BC846A variants specify 110 hFE minimum at 2 mA collector current, while BC846B variants specify 200 hFE minimum at the same operating point. All BC846 variants are ROHS3 compliant and Active products. These parts are suitable for applications where the MMBT2484 specifications represent minimum requirements and where enhanced voltage rating provides design margin.

Automotive-Grade Alternatives:

SBC846ALT1G, SBC846BLT1G, and SBC846BLT3G are automotive-grade equivalents of the BC846 series, qualified to AEC-Q101 standard. These parts maintain identical electrical specifications to their BC846 counterparts (65 V breakdown voltage, 100 mA collector current, 300 mW power dissipation) and are suitable for automotive and high-reliability applications requiring AEC-Q101 qualification. Selection of automotive-grade parts is required for applications subject to automotive industry standards.

Not Recommended:

MMBT6429LT1G is not recommended as a substitute for the MMBT2484. Although both parts share the SOT-23-3 package and surface mount mounting type, the MMBT6429LT1G has a maximum collector-emitter breakdown voltage of 45 V, which is below the MMBT2484 specification of 60 V. This part is suitable only for applications with lower voltage requirements and higher current capability (200 mA vs. 100 mA).

Frequently Asked Questions (FAQ)

Q: Can MMBT2484LT1G and MMBT2484LT3G be used interchangeably with the obsolete MMBT2484?

A: Yes. MMBT2484LT1G and MMBT2484LT3G are direct electrical equivalents of the MMBT2484, maintaining identical collector-emitter breakdown voltage (60 V), collector current rating (100 mA), and saturation voltage characteristics. The only difference is packaging format (Cut Tape vs. Tape & Reel). Both are suitable for direct replacement without circuit modification.

Q: What is the difference between BC846A and BC846B variants?

A: The primary difference is DC current gain (hFE). BC846A variants specify a minimum hFE of 110 at 2 mA collector current and 5 V collector-emitter voltage. BC846B variants specify a minimum hFE of 200 at the same operating point. Both variants share identical breakdown voltage (65 V), collector current rating (100 mA), and package type (SOT-23-3).

Q: Are SBC846 parts suitable for non-automotive applications?

A: SBC846 parts are automotive-grade transistors qualified to AEC-Q101 standard. While they can be used in non-automotive applications, they are specifically designed and qualified for automotive environments. For non-automotive applications, BC846 variants are appropriate alternatives with identical electrical specifications.

Q: Can BC846 series parts replace MMBT2484 in all applications?

A: BC846 series parts have a higher collector-emitter breakdown voltage (65 V vs. 60 V) and lower power dissipation rating (300 mW vs. 350 mW). They are suitable for applications where the MMBT2484 specifications represent minimum requirements. Applications requiring the full 350 mW power dissipation capability should use MMBT2484LT1G or MMBT2484LT3G instead.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials in electrical and electronic equipment. All active substitute parts listed are ROHS3 compliant, making them suitable for applications subject to environmental and regulatory requirements.

Q: Why is MMBT6429LT1G not recommended as a substitute?

A: MMBT6429LT1G has a maximum collector-emitter breakdown voltage of 45 V, which is below the MMBT2484 specification of 60 V. Using this part in circuits designed for 60 V operation would result in device failure. This part is suitable only for applications with lower voltage requirements.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape (CT) & Digi-Reel® packaging supplies components on tape that can be cut to length for manual or semi-automated assembly. Tape & Reel (TR) packaging supplies components on continuous tape wound on a reel for automated pick-and-place assembly. Selection depends on assembly line equipment and production volume requirements.

Q: Are all substitute parts available in the same package type?

A: Yes. All substitute parts listed are housed in SOT-23-3 (TO-236) surface mount packages, maintaining mechanical and electrical compatibility with the MMBT2484. Pin configuration and footprint are identical across all listed parts.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message