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onsemi MJE701STU
- Part No.:
- MJE701STU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
MJE701STU.pdf
- Description:
- TRANS PNP DARL 60V 4A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,303
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Product details
Overview
MJE701STU from Fairchild Semiconductor is a PNP epitaxial silicon Darlington transistor in TO-126 package, rated for -60 V VCEO, -4 A IC, and 40 W PC at TC = 25°C; features monolithic construction with built-in base-emitter resistors (R1 ≈ 10 kΩ, R2 ≈ 0.6 kΩ) and minimum hFE = 750 at IC = -1.5 A; used in high-gain linear amplification and medium-power switching in industrial control power stages.
For engineers reviewing the MJE701STU datasheet, pinout, applications, or equivalent options, key selection criteria include verified VCEO/VCBO ratings, DC current gain consistency across IC = -1.5 A to -4 A, saturation voltage behavior under defined IB drive, thermal derating profile, and compatibility with complementary NPN MJE801 devices in push-pull configurations.
Technical Context
This Darlington pair integrates two PNP transistors on a single die with embedded biasing resistors, enabling simplified base drive and stable high-current amplification without external resistor networks. It operates as a single-stage high-beta switch or linear amplifier with guaranteed hFE ≥ 750 at IC = -1.5 A and -2 A, and exhibits VCE(sat) ≤ -2.8 V at IC = -2 A / IB = -40 mA.
The device uses epitaxial base technology for improved frequency response and ruggedness, with junction temperature limited to 150°C and storage range spanning -55°C to +150°C. Its safe operating area (SOA) is characterized up to 5 ms pulse width, supporting transient load handling in relay drivers and motor control interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -60 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines usable voltage headroom in DC/AC switching applications. |
| IC | -4 A - Continuous collector current rating; sets maximum steady-state load current capability with adequate heatsinking. |
| PC | 40 W - Maximum power dissipation at case temperature 25°C; requires thermal design to maintain TC ≤ 25°C for full rating. |
| hFE | 750 (min.) - DC current gain at VCE = -3 V, IC = -1.5 A; enables low-base-drive-current switching in driver circuits. |
| VCE(sat) | -2.8 V - Collector-emitter saturation voltage at IC = -2 A, IB = -40 mA; determines conduction loss and heat generation in on-state operation. |
| TJ | 150°C - Maximum allowable junction temperature; constrains thermal design margin and long-term reliability under sustained load. |
Pinout & Package
Package: TO-126 - Three-lead plastic power package with metal tab for heatsink mounting; lead spacing and outline conform to JEDEC TO-126 standard; tab is electrically connected to collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal of Darlington pair | Reference node for current sourcing; polarity-sensitive connection in PNP configuration; must be at highest potential in circuit. |
| 2 (Collector) | Collector terminal (connected to metal tab) | Main current output path; electrically tied to heatsink; requires isolation if heatsink is grounded or at different potential. |
| 3 (Base) | Input control terminal with internal bias network | Accepts base current through integrated R1/R2 network; simplifies drive requirements versus discrete Darlington or standard PNP. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic Darlington structure | Single-die integration eliminates inter-device parameter mismatch and improves thermal coupling for consistent gain and switching behavior. |
| Built-in base-emitter resistors (R1 ≈ 10 kΩ, R2 ≈ 0.6 kΩ) | Reduces external component count and PCB footprint; provides self-biasing for predictable turn-on threshold and stable quiescent operation. |
| Complementary pairing with MJE801 | Enables matched push-pull output stages in Class-B amplifiers or H-bridge motor drivers without gain or VBE skew compensation. |
| High hFE ≥ 750 at IC = -1.5 A | Lowers required base drive current by >10× versus standard PNP transistors, easing microcontroller GPIO or logic-level driver interface. |
Applications
| Relay Driver Stage | Linear Voltage Regulator Pass Element |
|---|---|
Use Scenario: Driving 24 VDC industrial relays with coil resistance ~200 Ω requiring ~120 mA hold current and higher inrush. IC Role / Device Role / Timing Role: High-gain PNP Darlington switch providing low-input-current, high-output-current amplification between logic-level control and relay coil. Use Value: Enables direct drive from 3.3 V/5 V MCU outputs without additional transistor staging; VCE(sat) ≤ -2.8 V ensures minimal dropout and coil energization margin. | Use Scenario: Pass element in adjustable negative linear regulator delivering -15 V @ 1.5 A with 3 V input-to-output differential. IC Role / Device Role / Timing Role: Series pass transistor regulating output voltage via feedback-controlled base current in emitter-follower configuration. Use Value: High hFE minimizes base drive current burden on error amplifier; 40 W PC supports continuous operation with appropriate heatsinking. |
| DC Motor Direction Control (Half-Bridge) | High-Current LED Dimming Circuit |
Use Scenario: Low-side PNP switch in half-bridge topology controlling direction of 24 V brushed DC motor drawing up to 3 A peak. IC Role / Device Role / Timing Role: Complementary high-current switching element paired with NPN MJE801; handles reverse current flow during PWM commutation. Use Value: Matched VCEO/IC ratings and SOA with MJE801 ensure symmetrical switching performance and thermal balance in bidirectional drive. | Use Scenario: Constant-current sink for high-brightness white LED strings (12 V supply, 350 mA per string, 5 strings). IC Role / Device Role / Timing Role: Linear current-regulating element controlled by op-amp feedback loop; dissipates excess power as heat during dimming. Use Value: Stable hFE across operating range ensures accurate current mirroring; TO-126 package allows direct heatsink attachment for thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MPSA92 | Lower IC (-500 mA), no built-in resistors, TO-92 package; hFE = 40–120, VCEO = -300 V. | Not suitable for >1 A loads or space-constrained layouts; lacks integrated biasing, requiring external resistors. | Select only for low-current, high-voltage signal switching where gain stability and power handling are secondary. |
| STMicroelectronics BD140 | TO-126 package, -1.5 A IC, -80 V VCEO, no built-in resistors; hFE = 40–250, VCE(sat) = -0.5 V typical at IC = -0.5 A. | Lower current rating and no internal bias network; requires external base drive design; better VCE(sat) at light loads but inferior gain at full rating. | Prefer when lower saturation loss at sub-1 A is critical and board space permits discrete bias components. |
Compared with MPSA92 and BD140, the MJE701STU delivers superior current gain at high collector currents, integrated biasing for simplified layout, and proven 4 A/40 W capability in industrial-grade TO-126 packaging-making it optimal for medium-power PNP switching where drive simplicity and thermal robustness are prioritized.
Availability
MJE701STU is available at Aetrix Electronics and suitable for industrial motor control, relay interfacing, linear regulator pass elements, and high-current LED dimming applications requiring stable component supply and long-lifecycle support.
Supply support for MJE701STU 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2016.
The MJE701STU belongs to Fairchild's legacy general-purpose power transistor family designed for robust, cost-effective medium-power linear and switching applications in industrial and consumer equipment.
FAQ
What is the maximum continuous collector current rating for MJE701STU?
The MJE701STU is rated for -4 A continuous collector current (IC) at case temperature TC = 25°C. Derating is required above 25°C per the published power derating curve; at TC = 100°C, the usable IC drops to approximately -2.5 A to maintain safe junction temperature. This rating assumes proper heatsinking and airflow per TO-126 thermal guidelines.
Does MJE701STU have built-in base resistors, and what are their values?
Yes, the MJE701STU features monolithic integration of two base-emitter resistors: R1 ≈ 10 kΩ and R2 ≈ 0.6 kΩ, as shown in the equivalent circuit diagram. These resistors provide self-biasing to stabilize turn-on behavior and reduce external component count. Their values are process-trimmed and not user-adjustable; they enable reliable operation with simple voltage-driven base inputs.
What is the collector-emitter saturation voltage (VCE(sat)) of MJE701STU under typical operating conditions?
The MJE701STU specifies VCE(sat) = -2.8 V maximum at IC = -2 A and IB = -40 mA. At lower currents (e.g., IC = -1.5 A), VCE(sat) is typically -2.5 V. This value reflects conduction loss during saturated switching and directly impacts power dissipation and system efficiency in on-state operation.
Is MJE701STU pin-compatible with other devices in the MJE700 series?
Yes, all MJE700-series devices-including MJE700, MJE701, MJE702, and MJE703-share identical TO-126 pinout (Emitter-Collector-Base) and mechanical footprint. However, electrical ratings differ: MJE701 and MJE700 share -60 V VCEO, while MJE702/MJE703 are rated for -80 V. Always verify voltage and current requirements against the specific variant.
What is the junction-to-case thermal resistance (RθJC) of MJE701STU?
The datasheet does not explicitly list RθJC for MJE701STU. However, based on TO-126 package characterization and thermal curves in the Fairchild document, typical RθJC for this construction is ~1.5°C/W. For precise thermal design, users should apply the provided power derating curve and assume worst-case junction temperature rise using measured case temperature and actual dissipated power.
MJE701STU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- PNP - Darlington
- Current - Collector (Ic) (Max):
- 4 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 2.8V @ 40mA, 2A
- Current - Collector Cutoff (Max):
- 100µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 750 @ 2A, 3V
- Power - Max:
- 40 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126-3
MJE701STU FAQ
1.How can I place an order for MJE701STU through Aetrix?
Please submit a Request for Quotation (RFQ) for MJE701STU 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 MJE701STU reliable?
The price and inventory of MJE701STU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE701STU is usually 5 days.
3.What payment methods are accepted for MJE701STU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE701STU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJE701STU?
MJE701STU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJE701STU 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 MJE701STU?
For technical support, including MJE701STU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE701STU requirements.
6.How does Aetrix verify that MJE701STU is sourced from the original manufacturer or authorized distributors?
All MJE701STU 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 MJE701STU meets industry standards.
7.What is the process for return or replacement of MJE701STU?
All MJE701STU units undergo pre-shipment inspection (PSI). If there is an issue with MJE701STU, 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 MJE701STU part is unused and in its original packaging.
Return procedure for MJE701STU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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