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onsemi MJE182STU
- Part No.:
- MJE182STU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
MJE182STU.pdf
- Description:
- TRANS NPN 80V 3A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,718
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Product details
Overview
MJE182STU from ON Semiconductor is an NPN epitaxial silicon transistor designed for low-power audio amplification and high-speed switching applications. It features a collector-emitter voltage rating of 80 V, DC collector current up to 3 A, and a maximum power dissipation of 12.5 W at TC = 25°C in a TO-126 package. Its hFE ranges from 12 to 250 (IC = 100–1500 mA), supporting robust gain control in linear and switching circuits.
For engineers reviewing the MJE182STU datasheet, pinout, applications, or equivalent options, key selection criteria include its 80 V VCEO rating, 3 A IC capability, TO-126 thermal performance, and suitability for Class AB audio stages or relay drivers where moderate power handling and fast turn-on/turn-off are required.
Technical Context
The MJE182STU operates as a general-purpose bipolar junction transistor with fixed NPN polarity and epitaxial base construction, enabling stable gain and low leakage across temperature. Its safe operating area (SOA) supports pulsed currents up to 6 A and defines limits for simultaneous VCE and IC under transient conditions.
It exhibits a current gain bandwidth product (fT) of 50 MHz at VCE = 10 V and IC = 100 mA, confirming utility in low-frequency amplification and switching up to several megahertz. Output capacitance (Cob) is 30 pF at VCB = 10 V, contributing to predictable switching behavior in driver and amplifier topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 100 V - Maximum reverse bias voltage between collector and base before breakdown; enables use in 80 V rail systems with margin. |
| VCEO | 80 V - Maximum collector-emitter voltage with base open; defines upper limit for switch or amplifier output swing. |
| IC (DC) | 3 A - Continuous collector current capacity; supports medium-power loads like small relays or speaker drivers. |
| hFE (min–max) | 12–250 - DC current gain range across 100 mA–1.5 A; allows design flexibility in biasing for linear or saturated operation. |
| VCE(sat) | 0.3–1.7 V - Saturation voltage at IC = 500 mA–3 A; determines conduction loss and heat generation in switching mode. |
| fT | 50 MHz - Current gain–bandwidth product; confirms usable frequency response for audio and low-MHz digital switching. |
| Cob | 30 pF - Output capacitance at VCB = 10 V; impacts switching speed and Miller effect in common-emitter configurations. |
Pinout & Package
Package: TO-126 plastic power package with integral metal tab for heatsinking; dimensions per Fairchild Rev. A1 (16.10 × 13.06 × 4.2 mm); mounting hole ø3.20 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side reference; carries full load current in common-emitter configuration. |
| 2 (Collector) | Current source terminal | Connected to positive supply or load; handles high-voltage switching and dissipates majority of power. |
| 3 (Base) | Control input | Receives drive current to modulate collector current; requires external current-limiting resistor for safe biasing. |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO rating | 80 V enables reliable operation in 48 V and 60 V industrial power rails with safety margin. |
| TO-126 thermal performance | 12.5 W PC at TC = 25°C supports direct heatsink mounting without complex thermal interface layers. |
| Wide hFE range | 12–250 across operating current ensures consistent bias stability in production across unit-to-unit variation. |
| Low Cob | 30 pF minimizes Miller feedback, improving switching edge fidelity in pulse-width modulation drivers. |
Applications
| Audio Power Amplifier Stage | DC Motor Driver (Small) |
|---|---|
Use Scenario: Used in complementary Class AB output stage of portable audio amplifiers delivering ≤5 W into 8 Ω loads. IC Role / Device Role / Timing Role: NPN output transistor providing current gain and voltage swing amplification in push-pull topology. Use Value: 80 V VCEO and 3 A IC allow headroom for 24 V supplies and transient peaks; TO-126 package enables compact heatsinking. | Use Scenario: Drives brushed DC motors in battery-powered tools or actuators drawing up to 2.5 A continuous. IC Role / Device Role / Timing Role: Low-side switch controlling motor current path to ground in H-bridge half-bridge configuration. Use Value: 1.7 V VCE(sat) at 3 A limits conduction loss to ~5.1 W; hFE ≥12 ensures adequate base drive with microcontroller GPIO. |
| Relay Driver Circuit | Linear Voltage Regulator Pass Element |
Use Scenario: Switches 24 V/1 A electromagnetic relays in PLC I/O modules and industrial control panels. IC Role / Device Role / Timing Role: Saturated switch interfacing logic-level signals to inductive coil loads. Use Value: 6 A ICP rating accommodates relay coil inrush; built-in SOA curve validates safe turn-on without snubbers. | Use Scenario: Acts as series pass transistor in adjustable linear regulators supplying 3–12 V at up to 2 A for analog sensor subsystems. IC Role / Device Role / Timing Role: Continuously biased active element regulating output voltage via emitter-follower configuration. Use Value: 12.5 W PC at TC = 25°C supports 5 V dropout at 2 A (10 W dissipation) with modest heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJE13003 | Higher VCEO (400 V), lower hFE (5–30), TO-126 package | Better suited for flyback SMPS primary switches; less ideal for linear audio due to gain compression | Select when high-voltage isolation is critical and gain linearity is secondary |
| BD139 | Lower VCEO (80 V same), lower IC (1.5 A), TO-126, hFE 25–250 | Thermally limited to 12.5 W only at TC = 25°C but derates faster above 25°C | Prefer for cost-sensitive, lower-current (<1.2 A) linear amplifiers where thermal margin is sufficient |
Compared with MJE13003 and BD139, the MJE182STU offers superior DC current handling (3 A vs. 1.5 A or unspecified), higher fT (50 MHz vs. ~3 MHz for BD139), and optimized SOA for audio and motor drive-making it the preferred choice where sustained 2–3 A conduction and gain stability are required.
Availability
MJE182STU is available at Aetrix Electronics and suitable for audio amplifier designs, relay driver circuits, DC motor control, and linear regulator pass elements requiring stable component supply and long-term manufacturability.
Supply support for MJE182STU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MJE182STU belongs to ON Semiconductor's legacy general-purpose bipolar transistor family, originally developed by Fairchild for robust, cost-effective linear amplification and medium-power switching in non-critical industrial and consumer equipment.
FAQ
What is the maximum continuous collector current rating for the MJE182STU?
The MJE182STU has a maximum DC collector current (IC) rating of 3 A at ambient temperature (Ta = 25°C). This rating assumes proper heatsinking and adherence to the device's safe operating area (SOA) curve. At elevated case temperatures, derating applies per the power derating graph in the datasheet, where dissipation drops linearly beyond TC = 25°C.
Does the MJE182STU have a built-in base-emitter resistor?
No, the MJE182STU is a standard discrete NPN bipolar junction transistor without any integrated base resistors. External base current limiting is required for reliable operation. The device uses a three-terminal TO-126 configuration (Emitter, Collector, Base), and all biasing must be implemented externally using discrete resistors or active drive circuitry.
Can the MJE182STU be used in audio amplifier output stages?
Yes, the MJE182STU is explicitly specified for low-power audio amplifier applications in its datasheet. Its 80 V VCEO, 3 A IC, and hFE range of 12–250 support Class AB push-pull output stages driving 4–8 Ω loads at up to ~5 W. Thermal performance in TO-126 allows direct heatsink mounting, making it suitable for compact audio modules.
What is the typical saturation voltage of the MJE182STU at 3 A collector current?
The MJE182STU exhibits a typical VCE(sat) of 1.7 V at IC = 3 A and IB = 600 mA, as specified in the datasheet. This value reflects the voltage drop across the collector-emitter junction when fully saturated, directly impacting conduction losses and thermal design in switching applications such as relay or motor control.
Is the MJE182STU RoHS compliant and lead-free?
Yes, the MJE182STU is RoHS compliant and lead-free. As part of ON Semiconductor's post-Fairchild integration, the device meets JEDEC JS-709B and EU RoHS Directive 2011/65/EU requirements. The TO-126 package uses matte tin (Sn) lead finish, and full compliance documentation is available through ON Semiconductor's quality portal.
MJE182STU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.7V @ 600mA, 3A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 50 @ 100mA, 1V
- Power - Max:
- 1.5 W
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126-3
MJE182STU FAQ
1.How can I place an order for MJE182STU through Aetrix?
Please submit a Request for Quotation (RFQ) for MJE182STU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MJE182STU reliable?
The price and inventory of MJE182STU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE182STU is usually 5 days.
3.What payment methods are accepted for MJE182STU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE182STU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJE182STU?
MJE182STU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJE182STU order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MJE182STU?
For technical support, including MJE182STU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE182STU requirements.
6.How does Aetrix verify that MJE182STU is sourced from the original manufacturer or authorized distributors?
All MJE182STU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MJE182STU meets industry standards.
7.What is the process for return or replacement of MJE182STU?
All MJE182STU units undergo pre-shipment inspection (PSI). If there is an issue with MJE182STU, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MJE182STU part is unused and in its original packaging.
Return procedure for MJE182STU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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