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Diodes Incorporated FMMT555TC
- Part No.:
- FMMT555TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT555TC.pdf
- Description:
- TRANS PNP 150V 1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:25,718
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Product details
Overview
FMMT555TC from Diodes Incorporated is a 150V PNP medium-power transistor in SOT23 package, rated for -1A continuous collector current and -150V collector-emitter breakdown voltage, with AEC-Q101 qualification for automotive reliability; used in high-voltage switching and load control circuits such as LED driver stages and power supply feedback loops.
For engineers reviewing the FMMT555TC datasheet, FMMT555TC pinout, FMMT555TC application, or FMMT555TC equivalent, key selection criteria include VCEO = -150V, IC = -1A, hFE ≥ 50 at -10mA, VCE(SAT) ≤ -300mV at -100mA/-10mA, and thermal resistance RθJA = 250°C/W under standard PCB mounting.
Technical Context
This PNP bipolar junction transistor operates in linear or saturated switching modes, supporting high-voltage off-state blocking (VCEO = -150V) and robust pulsed current handling (ICM = -2A). Its hFE ranges from 50 to 300 across IC = -10mA to -300mA, enabling stable current amplification in bias networks and discrete amplifier stages.
VBE(SAT) = -0.79V typical at -100mA/-10mA and fT = 100MHz ensure fast turn-on/turn-off behavior suitable for PWM-driven loads up to several hundred kHz, while Cobo = 10pF limits high-frequency coupling in noise-sensitive analog interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -150 V: Maximum safe collector-emitter voltage before avalanche conduction in open-base configuration. |
| IC | -1 A: Continuous DC collector current rating defining steady-state power stage capacity. |
| hFE | 50–300: DC current gain range enabling predictable base drive sizing across operating currents. |
| VCE(SAT) | -97 to -300 mV: Saturation voltage determining on-state power loss and thermal loading at IC = -100mA. |
| RθJA | 250 °C/W: Junction-to-ambient thermal resistance under standard FR-4 PCB mounting, guiding heatsinking requirements. |
| fT | 100 MHz: Transition frequency indicating usable bandwidth for small-signal amplification or high-speed switching. |
| ESD HBM | 4000 V: Human-body-model ESD tolerance ensuring robustness during board assembly and handling. |
Pinout & Package
SOT23 plastic surface-mount package with matte tin-plated leads, UL 94V-0 flammability rating, and moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emission terminal for majority carriers | Reference node for base-emitter biasing; connects to higher potential in PNP operation. |
| 2 (Base) | Control electrode | Receives negative current to enable conduction; requires current-limiting resistor in most applications. |
| 3 (Collector) | Current collection terminal | Connects to load and supply return path; carries full switched current and dissipates heat via lead. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade temperature cycling (-55°C to +150°C), vibration, and humidity stress. |
| VCEO ≥ -150V | Enables use in 100V+ DC bus switching, including industrial power supplies and motor control feedback paths. |
| IC = -1A continuous | Supports direct driving of medium-power loads like relays, solenoids, and LED strings without external buffering. |
| Green, halogen-free construction | Meets RoHS 3 and JEDEC J-STD-020 Level 1 standards for environmental compliance and solderability. |
| Low VCE(SAT) | Reduces conduction losses below 30mW at 100mA, improving efficiency in battery-powered and thermally constrained designs. |
Applications
| Automotive Lighting Control | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Switching 24V LED arrays in headlamp or interior lighting modules. IC Role / Device Role / Timing Role: PNP high-side switch controlling current flow from battery rail to LED anode. Use Value: -150V VCEO provides margin against load-dump transients; -1A rating supports multi-string configurations. | Use Scenario: Error amplifier output stage in isolated flyback or forward converter feedback loop. IC Role / Device Role / Timing Role: Discrete transistor amplifying optocoupler output to drive TL431 reference input. Use Value: hFE ≥ 50 ensures stable closed-loop regulation; low VCE(SAT) minimizes offset error at light loads. |
| DC Motor Brake Circuit | High-Voltage Sensor Interface |
Use Scenario: Dynamic braking of 48V BLDC motor phases during emergency stop. IC Role / Device Role / Timing Role: Fast-turnoff PNP switch sinking phase current into ground through braking resistor. Use Value: fT = 100MHz enables sub-microsecond switching; -2A ICM handles short-duration regenerative surges. | Use Scenario: Level-shifting and isolation interface between 120V AC-sensing circuitry and 3.3V microcontroller GPIO. IC Role / Device Role / Timing Role: High-voltage PNP buffer isolating MCU from mains-referenced signal conditioning. Use Value: -160V VCBO withstands peak AC line voltages; Cobo = 10pF limits capacitive coupling noise injection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX653 | VCEO = -100V, IC = -1A, hFE = 100–800, SOT23 package | Limited to ≤100V systems; higher hFE reduces base drive burden but lower voltage margin risks avalanche in 120V+ rails. | Select when cost sensitivity outweighs voltage derating needs and base drive current must be minimized. |
| MMBT5401 | VCEO = -160V, IC = -0.6A, hFE = 60–250, SOT23 package | Lower IC restricts use to ≤600mA loads; identical voltage rating allows drop-in replacement where current demand is reduced. | Choose for legacy designs requiring same footprint with relaxed current requirements and tighter hFE distribution. |
Compared with ZTX653 and MMBT5401, FMMT555TC uniquely balances -150V blocking, -1A current, and AEC-Q101 qualification-making it optimal for automotive and industrial 100–150V switching where reliability and voltage margin are non-negotiable.
Availability
FMMT555TC is available at Aetrix Electronics and suitable for automotive lighting control, industrial power supply feedback, DC motor brake circuits, and high-voltage sensor interface applications requiring stable component supply and long-term manufacturability.
Supply support for FMMT555TC 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
FMMT555TC belongs to Diodes' AEC-Q101-qualified SOT23 transistor family, designed specifically for high-voltage, medium-current switching in harsh-environment automotive and industrial power systems.
FAQ
What is the maximum allowable junction temperature for FMMT555TC?
The FMMT555TC has an operating junction temperature range of -55°C to +150°C. This upper limit is defined by its silicon process and packaging integrity, and must not be exceeded even transiently during pulse operation. Derating of power dissipation begins above +25°C ambient, following the RθJA = 250°C/W curve provided in the datasheet.
Is FMMT555TC pin-compatible with FMMT455?
No-FMMT555TC (PNP) and FMMT455 (NPN) are complementary devices with identical SOT23 pinout (Emitter-Base-Collector), but opposite polarity and biasing requirements. Their electrical characteristics differ significantly: FMMT455 has VCEO = +150V and IC = +1A, making them functionally matched but not interchangeable without circuit redesign.
Does FMMT555TC require a heatsink in standard SOT23 mounting?
Under standard conditions (15mm × 15mm 1oz copper pad on FR-4), no external heatsink is required for ≤300mW power dissipation. At its rated 500mW PD, junction temperature rise reaches 125°C above ambient-so heatsinking or enhanced copper area is needed for sustained operation near maximum ratings, especially above +70°C ambient.
Can FMMT555TC be used in linear amplifier configurations?
Yes-its hFE stability (50–300) and fT = 100MHz support Class-A and AB small-signal amplification, particularly in high-input-impedance PNP emitter-follower or differential pair stages. However, thermal limitations and lack of guaranteed linearity specs mean it's optimized for switching; precision analog use requires individual unit characterization.
FMMT555TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 50 @ 300mA, 10V
- Power - Max:
- 500 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT555TC FAQ
1.How can I place an order for FMMT555TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT555TC 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 FMMT555TC reliable?
The price and inventory of FMMT555TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT555TC is usually 5 days.
3.What payment methods are accepted for FMMT555TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT555TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT555TC?
FMMT555TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT555TC 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 FMMT555TC?
For technical support, including FMMT555TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT555TC requirements.
6.How does Aetrix verify that FMMT555TC is sourced from the original manufacturer or authorized distributors?
All FMMT555TC 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 FMMT555TC meets industry standards.
7.What is the process for return or replacement of FMMT555TC?
All FMMT555TC units undergo pre-shipment inspection (PSI). If there is an issue with FMMT555TC, 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 FMMT555TC part is unused and in its original packaging.
Return procedure for FMMT555TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT555TC Tags
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Diodes Incorporated
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Diodes Incorporated
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