MMBTA42 Equivalent & Substitute Parts

Part Overview

The MMBTA42 is an NPN bipolar junction transistor (BJT) manufactured by Good-Ark Semiconductor, designed for general-purpose switching and amplification applications. This surface-mount device operates at 300 V collector-emitter breakdown voltage with a maximum collector current of 300 mA and power dissipation of 350 mW. The part is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to supply constraints, design flexibility, or manufacturing preferences.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	300	mA
Voltage - Collector Emitter Breakdown (Max)	300	V
Vce Saturation (Max)	200	mV @ 2mA, 20mA
Current - Collector Cutoff (Max)	250	nA
DC Current Gain (hFE) Min	100	@ 10mA, 10V
Power - Max	350	mW
Frequency - Transition	50	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MMBTA42 are identified based on strict electrical and mechanical parameter equivalence. The substitution criteria are defined by the following key parameters:

Electrical Specifications:

Transistor Type: NPN
Maximum Collector Current (Ic): 300 mA
Collector-Emitter Breakdown Voltage: 300 V
Saturation Voltage (Vce): 200 mV @ 2mA, 20mA
Collector Cutoff Current (ICBO): 250 nA
DC Current Gain (hFE): 100 minimum @ 10mA, 10V
Maximum Power Dissipation: 350 mW
Transition Frequency: 50 MHz

Mechanical & Environmental Specifications:

Mounting Type: Surface Mount
Package: SOT-23-3 (TO-236-3, SC-59)
Operating Temperature: -55°C to 150°C
RoHS3 Compliance
Moisture Sensitivity Level: 1

Parts meeting all specified parameters within these ranges are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Parameter	MMBTA42 (Good-Ark)	MMBTA42 (EVVO Semi)	Match
Transistor Type	NPN	NPN	✓
Current - Collector (Ic) Max	300 mA	300 mA	✓
Voltage - Collector Emitter Breakdown (Max)	300 V	300 V	✓
Vce Saturation (Max)	200 mV @ 2mA, 20mA	200 mV @ 2mA, 20mA	✓
Current - Collector Cutoff (Max)	250 nA	250 nA	✓
DC Current Gain (hFE) Min	100 @ 10mA, 10V	100 @ 10mA, 10V	✓
Power - Max	350 mW	350 mW	✓
Frequency - Transition	50 MHz	50 MHz	✓
Operating Temperature (Max)	150°C	150°C	✓
Mounting Type	Surface Mount	Surface Mount	✓
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	✓

Engineering Selection Recommendations

The MMBTA42 manufactured by EVVO Semi is a direct parametric equivalent to the Good-Ark Semiconductor MMBTA42. Both devices share identical electrical specifications across all critical parameters including collector current, breakdown voltage, saturation characteristics, current gain, power rating, and transition frequency. Both parts maintain identical mechanical compatibility with SOT-23-3 surface-mount packaging and are fully RoHS3 compliant with MSL Level 1 rating.

Selection between these equivalent parts is based on availability, supply chain considerations, and manufacturing preferences. Both parts are classified as Active product status and are suitable for direct substitution in applications requiring NPN transistors with 300 V, 300 mA, and 350 mW specifications.

Frequently Asked Questions (FAQ)

Q: Can the MMBTA42 from EVVO Semi be used as a direct replacement for the Good-Ark MMBTA42?

A: Yes. Both devices meet identical electrical and mechanical specifications. All critical parameters including collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency are equivalent. Both use the same SOT-23-3 package and are RoHS3 compliant.

Q: Are there any differences in operating temperature ranges between these parts?

A: The Good-Ark MMBTA42 specifies an operating temperature range of -55°C to 150°C. The EVVO Semi MMBTA42 specifies a maximum operating temperature of 150°C. Both devices support the upper temperature limit of 150°C.

Q: Do both parts have the same moisture sensitivity rating?

A: Yes. Both the Good-Ark and EVVO Semi MMBTA42 devices carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the Good-Ark MMBTA42 and EVVO Semi MMBTA42 are ROHS3 compliant and REACH unaffected.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Both parts use identical SOT-23-3 surface-mount packaging (TO-236-3, SC-59). Pin configuration and footprint requirements are identical, allowing direct substitution in PCB designs without layout modifications.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution eligibility is determined by matching the following parameters: NPN transistor type, 300 mA maximum collector current, 300 V collector-emitter breakdown voltage, 200 mV saturation voltage at specified bias conditions, 250 nA collector cutoff current, 100 minimum DC current gain, 350 mW maximum power dissipation, and 50 MHz transition frequency.

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