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onsemi MJE800G
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- Part No.:
- MJE800G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
MJE800G.pdf
- Description:
- TRANS NPN DARL 60V 4A TO-126
- Quantity:
- Payment:
- Shipping:
Inventory:3,061
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Product details
Overview
MJE800G from onsemi is an NPN silicon Darlington power transistor in TO-225 package, rated for 60 VCEO, 4.0 A collector current, and 40 W power dissipation at TC = 25°C, with typical DC current gain (hFE) of 750 at IC = 1.5 A and VCE = 3.0 V - used in low-speed switching and linear amplifier stages of industrial power supplies and motor control circuits.
For engineers reviewing the MJE800G datasheet, pinout, applications, or equivalent options, key selection criteria include its built-in base-emitter resistors limiting leakage multiplication, thermal resistance RJC = 3.12°C/W, safe operating area up to second breakdown limits, and Pb-free RoHS-compliant TO-225 construction.
Technical Context
The MJE800G implements a monolithic Darlington pair with integrated base-emitter shunt resistors to suppress leakage current multiplication at high temperature. Its structure supports linear operation up to 150°C junction temperature and pulsed switching with tr/tf ≤ 10 ns under specified test conditions.
It operates within a defined active-region safe-operating area (SOA) bounded by thermal limits, bonding wire current capacity, and second breakdown - validated per Figures 5–6 in the datasheet across DC, 1 ms, 5 ms, and 100 s pulse widths at TJ(pk) = 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 Vdc - maximum collector-emitter voltage before breakdown at IC = 50 mA, defining usable voltage headroom in switching or amplifier rails. |
| IC | 4.0 Adc - continuous collector current rating at TC = 25°C, setting hard limit for sustained conduction without derating. |
| PD | 40 W - total power dissipation at case temperature 25°C; derates linearly at 0.32 W/°C above 25°C. |
| hFE | 750 (min) @ IC = 1.5 A, VCE = 3.0 V - ensures sufficient current amplification for low-base-drive switching applications. |
| VCE(sat) | 2.5 V max @ IC = 1.5 A, IB = 30 mA - defines conduction loss during saturation, directly impacting efficiency in switch-mode designs. |
| RJC | 3.12 °C/W - thermal resistance from junction to case, critical for heatsink sizing when mounting to metal chassis or extrusions. |
Pinout & Package
Package: TO-225 (Case 77-09, Style 1), plastic through-hole package with emitter (pin 1), dual collectors (pins 2 and 4), and base (pin 3); tab is electrically connected to collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Emitter | Main current exit path; referenced to ground or negative rail in common-emitter configurations. |
| Pins 2 & 4 | Collector | Parallel-connected collector terminals; provide low-inductance, high-current path to positive supply or load. |
| Pin 3 | Base | Control input for Darlington pair; requires ~30 mA drive for full saturation at 1.5 A output. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic Darlington with internal base-emitter resistors | Reduces leakage multiplication at elevated temperature, improving stability in linear amplifier bias networks. |
| High hFE = 750 min | Enables direct drive from microcontroller GPIO or logic-level signals without external pre-driver stages. |
| TO-225 package with collector-connected tab | Allows direct mechanical and thermal mounting to heatsinks while maintaining electrical connection to collector node. |
| Pb-free and RoHS-compliant construction | Meets global environmental compliance requirements for industrial and consumer end equipment without lead exemptions. |
Applications
| Industrial Power Supply | DC Motor Driver Stage |
|---|---|
Use Scenario: Used as series pass transistor in adjustable linear power supplies delivering up to 3 A at 24 V output. IC Role / Device Role / Timing Role: NPN Darlington power transistor operating in linear region to regulate output voltage via feedback-controlled base current. Use Value: High hFE reduces base drive burden; 40 W dissipation supports stable regulation under full-load conditions with adequate heatsinking. |
Use Scenario: Drives armature winding of 24 V brushed DC motors in conveyor systems and automated valves. IC Role / Device Role / Timing Role: Low-speed switching element in H-bridge half-bridge stage, controlled by PWM signal with slow slew rate. Use Value: Built-in base resistors prevent unintended turn-on due to leakage at ambient temperatures up to 85°C. |
| Audio Amplifier Output Stage | Relay/Solenoid Driver |
Use Scenario: Output device in Class AB audio amplifier delivering 10–20 W into 8 Ω speaker loads. IC Role / Device Role / Timing Role: Linear power transistor biased in active region to reproduce analog audio waveform with minimal crossover distortion. Use Value: SOA curves (Figure 6) confirm safe operation at VCE = 30 V and IC = 2 A for continuous sine-wave output. |
Use Scenario: Switches 24 V DC relays and 12 V solenoids in building automation and HVAC control panels. IC Role / Device Role / Timing Role: Single-ended switch connecting relay coil to ground; driven by optocoupler-isolated logic signal. Use Value: VCEO = 60 V provides 2.5× margin over 24 V nominal supply, accommodating inductive kickback without snubber. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TIP122 | VCEO = 100 V, hFE = 1000 min, same TO-225 package but higher voltage rating and gain. | Preferred where >60 V supply rails or higher gain margin is required; not drop-in due to different SOA boundaries. | Select TIP122 if system voltage exceeds 60 V or if lower base drive current (<20 mA) is needed at 2 A load. |
| MJE13009 | VCEO = 400 V, IC = 12 A, TO-220 package - higher voltage/current but incompatible pinout and thermal interface. | Suitable for flyback or SMPS primary-side switching; not interchangeable due to package and SOA mismatch. | Choose MJE13009 only for high-voltage AC-DC conversion; requires PCB redesign and thermal analysis. |
Compared with TIP122 and MJE13009, the MJE800G offers optimized balance of 60 V rating, 4 A capability, and TO-225 mechanical compatibility for cost-sensitive industrial linear and low-speed switching roles - neither alternative matches its exact voltage-current-thermal tradeoff in this footprint.
Availability
MJE800G is available at Aetrix Electronics and suitable for industrial power supplies, DC motor drivers, audio amplifier output stages, and relay/solenoid control circuits requiring stable component supply and long-term manufacturability.
Supply support for MJE800G 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MJE800G belongs to onsemi's legacy complementary Darlington power transistor family designed for robust, cost-effective linear amplification and low-speed switching in industrial control and power management systems.
FAQ
What is the maximum junction temperature for the MJE800G?
The MJE800G has an operating junction temperature range of –55°C to +150°C. This upper limit governs thermal design - when case temperature reaches 100°C, power dissipation must be reduced to 12 W (per derating curve in Figure 1), ensuring MJE800G remains within safe SOA boundaries during continuous operation.
Does the MJE800G have built-in protection features?
The MJE800G incorporates monolithic construction with integrated base-emitter shunt resistors to limit leakage current multiplication at high temperature - a passive reliability feature that improves bias stability in linear amplifier applications. It does not include thermal shutdown, overcurrent, or ESD protection circuitry.
Can the MJE800G replace the MJE700G in a circuit?
No - the MJE800G is NPN while the MJE700G is PNP, making them complementary rather than interchangeable. Swapping them would invert polarity and likely cause circuit failure. Both share TO-225 packaging and similar ratings, but their current flow direction and biasing requirements are fundamentally opposite.
What is the safe operating area (SOA) limitation for the MJE800G at DC operation?
At DC operation and TC = 25°C, the MJE800G's SOA is limited by thermal dissipation (40 W) and second breakdown. Per Figure 6, it supports up to 4 A at 10 V, 2 A at 30 V, or 1 A at 60 V - exceeding these combinations risks localized junction failure even if average power appears acceptable.
Is the MJE800G suitable for PWM motor control?
The MJE800G is rated for low-speed switching only - its switching times (tr/tf ≤ 10 ns under test) apply to single-pulse conditions, not repetitive PWM. For 1–20 kHz motor PWM, use dedicated MOSFETs or IGBTs; the MJE800G is best suited for <100 Hz on/off control or linear regulation where switching losses are minimized.
MJE800G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 4 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 2.5V @ 30mA, 1.5A
- Current - Collector Cutoff (Max):
- 100µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 750 @ 1.5A, 3V
- Power - Max:
- 40 W
- Frequency - Transition:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126
MJE800G FAQ
1.How can I place an order for MJE800G through Aetrix?
Please submit a Request for Quotation (RFQ) for MJE800G 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 MJE800G reliable?
The price and inventory of MJE800G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE800G is usually 5 days.
3.What payment methods are accepted for MJE800G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE800G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJE800G?
MJE800G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJE800G 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 MJE800G?
For technical support, including MJE800G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE800G requirements.
6.How does Aetrix verify that MJE800G is sourced from the original manufacturer or authorized distributors?
All MJE800G 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 MJE800G meets industry standards.
7.What is the process for return or replacement of MJE800G?
All MJE800G units undergo pre-shipment inspection (PSI). If there is an issue with MJE800G, 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 MJE800G part is unused and in its original packaging.
Return procedure for MJE800G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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