MJE181 Equivalent & Substitute Parts

Part Overview

The MJE181 is a through-hole NPN bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 3 A maximum collector current. The device is housed in a TO-126 package and operates across a temperature range of -65°C to 150°C. The MJE181 is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The MJE181G serves as the direct active substitute, maintaining electrical and mechanical compatibility while offering current product availability and improved compliance status.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	3	A
Voltage - Collector Emitter Breakdown (Max)	60	V
Vce Saturation (Max) @ Ib, Ic	1.7 @ 600mA, 3A	V
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 100mA, 1V	—
Frequency - Transition	50	MHz
Operating Temperature Range	-65 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—

Substitute Part Grouping Explanation

Substitution of the MJE181 with the MJE181G is based on electrical parameter equivalence and mechanical compatibility. Both devices share identical specifications for the following critical parameters:

Transistor Type: NPN
Maximum Collector Current (Ic): 3 A
Maximum Collector-Emitter Breakdown Voltage: 60 V
Saturation Voltage (Vce): 1.7 V @ 600mA, 3A
Collector Cutoff Current (ICBO): 100 nA
DC Current Gain (hFE): 50 @ 100mA, 1V
Transition Frequency: 50 MHz
Operating Temperature Range: -65°C to 150°C
Package Configuration: TO-126-3 through-hole

The MJE181G maintains full electrical compatibility with the MJE181 across all specified operating conditions and load requirements. Both devices are classified within the same base product family (MJE181 series) and utilize identical package geometry, enabling direct mechanical substitution without circuit board redesign.

Parameter Comparison

Parameter	MJE181	MJE181G	Match
Transistor Type	NPN	NPN	✓
Current - Collector (Ic) (Max)	3 A	3 A	✓
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	✓
Vce Saturation (Max) @ Ib, Ic	1.7V @ 600mA, 3A	1.7V @ 600mA, 3A	✓
Current - Collector Cutoff (Max)	100 nA	100 nA	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 100mA, 1V	50 @ 100mA, 1V	✓
Frequency - Transition	50 MHz	50 MHz	✓
Operating Temperature Range	-65°C to 150°C	-65°C to 150°C	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	TO-126-3	TO-126-3	✓
Product Status	Obsolete	Active	—
RoHS Status	Non-compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

The MJE181G is the direct equivalent substitute for the obsolete MJE181 transistor. Selection of the MJE181G is based on the following engineering criteria:

Product Status: The MJE181 is classified as obsolete, creating supply chain risk for new production and long-term support. The MJE181G maintains active product status with current manufacturing and distribution availability.

Electrical Equivalence: All electrical parameters are identical between the MJE181 and MJE181G, including collector current rating, breakdown voltage, saturation characteristics, current gain, and frequency response. No circuit modifications are required for substitution.

Mechanical Compatibility: Both devices utilize the TO-126-3 package configuration with identical pin assignments and through-hole mounting characteristics. Direct board-level substitution is possible without layout changes.

Compliance Status: The MJE181G is ROHS3 compliant, whereas the MJE181 is non-compliant. For applications subject to RoHS regulations or customer compliance requirements, the MJE181G satisfies regulatory obligations. Both devices maintain REACH Unaffected status and EAR99 export classification.

Moisture Sensitivity: The MJE181G carries Not Applicable moisture sensitivity level, indicating no special handling requirements during storage or assembly. The MJE181 specifies MSL 1 (Unlimited), which is equivalent in practical terms.

For new designs and production transitions, the MJE181G is the recommended selection. For legacy system maintenance where the MJE181 remains available, both parts are electrically interchangeable.

Frequently Asked Questions (FAQ)

Q: Can the MJE181G be used as a direct replacement for the MJE181 in existing circuits?

A: Yes. The MJE181G is electrically and mechanically equivalent to the MJE181. All electrical parameters, including collector current, breakdown voltage, saturation voltage, current gain, and frequency response, are identical. The TO-126-3 package configuration is the same, enabling direct substitution without circuit modifications or board redesign.

Q: What is the primary reason to substitute the MJE181 with the MJE181G?

A: The MJE181 is classified as obsolete, creating supply availability concerns. The MJE181G is an active product with current manufacturing and distribution support. Additionally, the MJE181G is ROHS3 compliant, whereas the MJE181 is non-compliant, making the MJE181G preferable for applications subject to regulatory requirements.

Q: Are there any electrical performance differences between the MJE181 and MJE181G?

A: No. Both devices share identical electrical specifications across all rated parameters: 3 A maximum collector current, 60 V breakdown voltage, 1.7 V saturation voltage, 50 MHz transition frequency, and -65°C to 150°C operating temperature range. Performance in circuit operation is equivalent.

Q: What is the package configuration for both the MJE181 and MJE181G?

A: Both devices are housed in the TO-126-3 through-hole package. This package type features three leads and is designed for insertion into standard through-hole circuit board patterns. Pin assignments and mechanical dimensions are identical between the two parts.

Q: Does the MJE181G require different handling or storage procedures compared to the MJE181?

A: The MJE181G specifies Not Applicable moisture sensitivity level, indicating standard handling procedures are sufficient. The MJE181 specifies MSL 1 (Unlimited), which is equivalent in practical application. Both devices can be stored and handled using standard component management practices.

Q: Are there any compliance or certification differences between the MJE181 and MJE181G?

A: Yes. The MJE181G is ROHS3 compliant, whereas the MJE181 is non-compliant. Both devices are REACH Unaffected and carry EAR99 export classification. For applications requiring RoHS compliance, the MJE181G is the appropriate selection.

Q: Can the MJE181G be used in high-temperature applications?

A: Yes. The MJE181G operates across the temperature range of -65°C to 150°C, identical to the MJE181. Both devices are suitable for applications requiring extended temperature operation within this range.

Q: What is the maximum power dissipation for the MJE181G?

A: The MJE181G is rated for 1.5 W maximum power dissipation. This specification differs from the MJE181, which is rated for 12.5 W. However, both devices maintain identical electrical performance specifications for collector current, voltage, and gain characteristics. Application power requirements should be evaluated against the 1.5 W rating of the MJE181G.

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