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onsemi MJD127TF
- Part No.:
- MJD127TF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MJD127TF.pdf
- Description:
- TRANS PNP DARL 100V 8A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:6,128
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Product details
Overview
MJD127TF from ON Semiconductor is a PNP Darlington transistor with built-in damper diode, rated for -100 V VCEO, -8 A IC, and 1.5 W power dissipation in TO-252-2L package; used in high-current linear regulation, relay driving, and industrial motor control circuits.
For engineers reviewing the MJD127TF datasheet, pinout, applications, or equivalent options, key selection criteria include verified DC current gain (hFE = 100–12,000 at IC = -4 A), collector-emitter saturation voltage (VCE(sat) = -2 V @ IC = -4 A, IB = -16 mA), and integrated E-C damper diode functionality.
Technical Context
The MJD127TF implements a monolithic PNP Darlington pair with emitter-follower output stage and an integrated reverse-biased damper diode across emitter-collector. It operates within -55 °C to +150 °C junction temperature range and supports continuous collector current up to -8 A under specified thermal conditions.
Its Darlington configuration delivers high DC current gain (min 100 at IC = -8 A) while maintaining low base drive requirements; the built-in damper diode eliminates need for external flyback protection in inductive load switching applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -100 V - Maximum safe collector-emitter voltage before breakdown; enables use in 48 V and 72 V industrial DC systems. |
| IC | -8 A - Continuous collector current rating; supports direct drive of solenoids, contactors, and small DC motors. |
| hFE | 100–12,000 - Wide DC current gain range; allows flexible base bias design from low-power microcontroller GPIOs to dedicated driver stages. |
| VCE(sat) | -2 V @ IC = -4 A - Low saturation voltage reduces conduction loss and thermal stress in linear or switching operation. |
| TJ | -55 °C to +150 °C - Extended junction temperature range supports deployment in under-hood automotive and industrial enclosures without forced cooling. |
| Cob | 300 pF @ VCB = -10 V - Output capacitance impacts switching speed; suitable for <100 kHz PWM and linear control, not RF. |
Pinout & Package
Package: TO-252-2L (DPAK), surface-mount, single-die plastic-encapsulated PNP Darlington transistor with integrated emitter-collector damper diode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input terminal | Receives base current to enable Darlington conduction; requires current-limiting resistor when driven from logic-level sources. |
| 2 (Collector) | Main current sink node | Connected to positive rail in high-side switch configurations; carries full load current to emitter. |
| 3 (Emitter) | Current return path & damper anode | Common reference for load; internal damper diode anode connects here, cathode to collector (pin 2). |
Key Features
| Feature | Design Value |
|---|---|
| Built-in emitter-collector damper diode | Eliminates external flyback diode in relay/solenoid drivers; reduces BOM count and PCB area by ~2 components. |
| High hFE at high current | Min 100 at IC = -8 A ensures reliable saturation with ≤80 mA base drive-compatible with standard logic buffers. |
| TO-252-2L thermally enhanced package | Low thermal resistance (RθJA ≈ 62 °C/W typical) enables 1.5 W dissipation with minimal copper pour on standard FR-4. |
| Electrically similar to TIP127 | Direct functional replacement for through-hole TIP127 in SMT designs; preserves legacy circuit behavior while enabling automated assembly. |
Applications
| Industrial Relay Driver | DC Motor Direction Control |
|---|---|
Use Scenario: Driving 24 V/48 V industrial relays with coil inductance >100 mH and hold current 20–100 mA. IC Role / Device Role / Timing Role: High-gain PNP Darlington switch providing low-loss current sinking path for relay coil return. Use Value: Integrated damper diode clamps inductive kickback, preventing voltage spikes > -100 V and eliminating external diode placement and routing. | Use Scenario: Bidirectional H-bridge half-bridge leg for 12–48 V brushed DC motors up to 5 A continuous. IC Role / Device Role / Timing Role: High-current PNP switch in high-side position; paired with NPN counterpart for direction reversal. Use Value: VCE(sat) ≤ -2 V at -4 A minimizes conduction loss and heat generation during forward conduction phase. |
| Linear Voltage Regulator Pass Element | Power Supply OR-ing Circuit |
Use Scenario: Series pass transistor in adjustable linear regulators delivering 3–12 V at up to 5 A for analog sensor subsystems. IC Role / Device Role / Timing Role: Thermally stable PNP pass element operating in active region with fixed base bias network. Use Value: hFE stability over -40 °C to +125 °C ensures consistent loop gain and output regulation across ambient extremes. | Use Scenario: Redundant 24 V DC input OR-ing in industrial PLC backplanes requiring fault-isolated dual supplies. IC Role / Device Role / Timing Role: PNP-based ideal diode controller front-end; emitter tied to supply, collector to load rail. Use Value: Low VBE(sat) (-4.5 V typ.) and high hFE allow precise base control for <100 mV forward drop in discrete OR-ing implementation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BDW93C | VCEO = -100 V, IC = -12 A, no integrated damper diode, TO-126 package | Requires external flyback diode; higher current rating but larger footprint and no SMT compatibility | Select when higher current headroom is needed and board space permits through-hole mounting. |
| ON Semiconductor MJD122TF | PNP Darlington, same TO-252-2L, but VCEO = -60 V, IC = -5 A, no damper diode | Limited to ≤48 V systems; lacks integrated protection-requires external diode for inductive loads | Choose only if lower voltage rating suffices and damper diode is added externally. |
Compared with BDW93C and MJD122TF, the MJD127TF uniquely combines SMT-compatible TO-252-2L packaging, -100 V rating, -8 A capability, and built-in damper diode-reducing component count and layout complexity in space-constrained industrial controls.
Availability
MJD127TF is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor controllers, linear regulator pass elements, and redundant power OR-ing circuits requiring stable component supply and long-term manufacturability.
Supply support for MJD127TF 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 supplier focused on energy-efficient electronics, delivering power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MJD127TF belongs to ON Semiconductor's high-voltage PNP Darlington transistor family, designed specifically for robust, high-current switching in industrial automation, power supplies, and electromechanical control systems.
FAQ
What is the maximum continuous collector current rating for the MJD127TF?
The MJD127TF is rated for -8 A continuous collector current (IC) at TA = 25 °C with sufficient heatsinking. Derating applies above 25 °C ambient; at 100 °C ambient, max IC drops to approximately -4.5 A per the thermal derating curve in the official datasheet. This rating assumes proper PCB copper area per TO-252-2L thermal guidelines.
Does the MJD127TF include an integrated damper diode, and how is it connected?
Yes, the MJD127TF integrates a damper diode between emitter and collector. The diode's anode is connected to the emitter (pin 3) and cathode to the collector (pin 2), enabling automatic clamping of inductive kickback voltages. This eliminates the need for an external flyback diode in relay or solenoid driver applications using the MJD127TF.
What is the DC current gain (hFE) range of the MJD127TF at different operating points?
The MJD127TF exhibits hFE = 1000–12,000 at IC = -4 A and hFE = 100 at IC = -8 A (both at VCE = -4 V). This wide gain range supports both precision biasing at moderate currents and robust saturation at full load, making the MJD127TF adaptable across multiple drive architectures without redesign.
Can the MJD127TF be used as a direct replacement for the through-hole TIP127 in new designs?
The MJD127TF is electrically similar to the TIP127 and shares identical voltage/current ratings and Darlington topology, but uses TO-252-2L surface-mount packaging instead of TO-220. It is not pin-compatible due to differing pinout and mounting; however, it serves as a functional SMT upgrade path when board layout is revised to accommodate the DPAK footprint and thermal pad requirements.
What is the collector-emitter saturation voltage (VCE(sat)) of the MJD127TF under typical switching conditions?
The MJD127TF specifies VCE(sat) = -2 V at IC = -4 A and IB = -16 mA, and -4 V at IC = -8 A and IB = -80 mA. These values reflect actual measured saturation performance under pulsed test conditions (≤380 µs pulse width, ≤2% duty cycle), confirming low conduction loss suitable for high-efficiency linear and PWM-driven loads using the MJD127TF.
MJD127TF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP - Darlington
- Current - Collector (Ic) (Max):
- 8 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 4V @ 80mA, 8A
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 1000 @ 4A, 4V
- Power - Max:
- 1.75 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MJD127TF FAQ
1.How can I place an order for MJD127TF through Aetrix?
Please submit a Request for Quotation (RFQ) for MJD127TF 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 MJD127TF reliable?
The price and inventory of MJD127TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD127TF is usually 5 days.
3.What payment methods are accepted for MJD127TF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD127TF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJD127TF?
MJD127TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJD127TF 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 MJD127TF?
For technical support, including MJD127TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD127TF requirements.
6.How does Aetrix verify that MJD127TF is sourced from the original manufacturer or authorized distributors?
All MJD127TF 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 MJD127TF meets industry standards.
7.What is the process for return or replacement of MJD127TF?
All MJD127TF units undergo pre-shipment inspection (PSI). If there is an issue with MJD127TF, 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 MJD127TF part is unused and in its original packaging.
Return procedure for MJD127TF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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