MJE182STU Equivalent & Substitute Parts

Part Overview

The MJE182STU is an NPN bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 3 A maximum collector current. This device is packaged in TO-126-3 through-hole configuration and is designed for general-purpose switching and amplification applications requiring moderate current handling at moderate voltage levels.

The MJE182STU is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing maintenance, repair, and new design requirements where this part number is specified or where existing inventory requires replenishment from active product lines.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	3	A
Power - Max	1.5	W
Frequency - Transition	50	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 100mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	1.7V @ 600mA, 3A	V
Current - Collector Cutoff (Max)	100	nA
Operating Temperature (Max)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—

Substitute Part Grouping Explanation

Substitution of the MJE182STU is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Transistor type: NPN polarity
Voltage rating: Collector-emitter breakdown voltage ≥ 80 V
Current rating: Collector current (Ic) ≥ 3 A
Power dissipation: Maximum power ≥ 1.5 W
Frequency response: Transition frequency ≥ 50 MHz
DC current gain: hFE ≥ 50 @ specified test conditions
Saturation voltage: Vce(sat) ≤ 1.7 V @ rated conditions
Package compatibility: Through-hole TO-126 family

Substitute Classification:

Direct Equivalent: MJE182G matches all electrical specifications and maintains identical base product lineage. This part is manufactured by onsemi and is in active product status, making it the primary replacement for obsolete MJE182STU applications.

Similar Substitute: 2N4923G shares the same voltage rating (80 V) and package family (TO-126) but operates at reduced maximum collector current (1 A versus 3 A) and lower transition frequency (3 MHz versus 50 MHz). This part is suitable only for applications where current and frequency requirements do not exceed 2N4923G specifications.

Parameter Comparison

Parameter	MJE182STU (Main)	MJE182G (Direct)	2N4923G (Similar)
Manufacturer	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	80 V
Current - Collector (Ic) (Max)	3 A	3 A	1 A
Power - Max	1.5 W	1.5 W	30 W
Frequency - Transition	50 MHz	50 MHz	3 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 100mA, 1V	50 @ 100mA, 1V	30 @ 500mA, 1V
Vce Saturation (Max) @ Ib, Ic	1.7V @ 600mA, 3A	1.7V @ 600mA, 3A	600mV @ 100mA, 1A
Current - Collector Cutoff (Max)	100 nA	100 nA	500 µA
Operating Temperature (Max)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-126-3	TO-126	TO-126
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Replacement (MJE182G):

MJE182G is the recommended substitute for MJE182STU in all applications. This part maintains electrical equivalence across all specified parameters and is manufactured by the same supplier (onsemi). MJE182G holds active product status, ensuring long-term availability and supply chain stability. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The transition from obsolete MJE182STU to active MJE182G introduces no design modifications or circuit re-qualification requirements.

For Current-Limited Applications (2N4923G):

2N4923G is suitable only for applications where maximum collector current does not exceed 1 A and transition frequency requirements do not exceed 3 MHz. This part exhibits higher maximum power dissipation (30 W) and lower saturation voltage (600 mV @ 100 mA, 1 A), making it applicable to specific low-frequency, low-current switching circuits. 2N4923G is not suitable as a general replacement for MJE182STU in circuits requiring the full 3 A current rating or 50 MHz frequency response. 2N4923G is ROHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can MJE182G be used as a direct replacement for MJE182STU without circuit modification?

A: Yes. MJE182G is electrically equivalent to MJE182STU across all specified parameters, including voltage rating, current rating, power dissipation, frequency response, and gain characteristics. No circuit modification is required. Both parts use identical TO-126 package family pinouts.

Q: What are the key differences between MJE182G and 2N4923G?

A: MJE182G and 2N4923G differ in maximum collector current (3 A versus 1 A), transition frequency (50 MHz versus 3 MHz), and saturation voltage characteristics. MJE182G is suitable for high-frequency, high-current applications, while 2N4923G is limited to low-frequency, low-current circuits. Maximum power dissipation differs significantly (1.5 W versus 30 W).

Q: Is 2N4923G a suitable replacement for MJE182STU in a 3 A application?

A: No. 2N4923G has a maximum collector current rating of 1 A, which is insufficient for applications requiring 3 A. Using 2N4923G in a 3 A circuit would exceed the device's absolute maximum ratings and result in device failure.

Q: Are there package compatibility concerns when substituting MJE182STU with MJE182G or 2N4923G?

A: All three parts use TO-126 family through-hole packages with compatible pinouts. No PCB layout modifications are required. Physical mounting and thermal characteristics remain consistent across these devices.

Q: What is the product status difference between MJE182STU and its substitutes?

A: MJE182STU is classified as obsolete, indicating discontinued manufacturing and limited availability. MJE182G and 2N4923G are both active products with ongoing manufacturing and guaranteed long-term supply. Transitioning to active products ensures design sustainability and supply chain reliability.

Q: Do MJE182G and 2N4923G meet the same environmental and regulatory standards as MJE182STU?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current environmental regulations. Compliance status is identical across all three devices.

Q: What is the primary criterion for selecting between MJE182G and 2N4923G?

A: Application current and frequency requirements determine the appropriate selection. If the circuit requires 3 A collector current or 50 MHz transition frequency, MJE182G is mandatory. If the circuit operates at ≤ 1 A and ≤ 3 MHz, 2N4923G is acceptable. For applications within 2N4923G limits, both parts are functionally compatible, though MJE182G provides additional performance margin.

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