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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated FMMT597TC

Name: FMMT597TC
Brand: Diodes Incorporated
SKU: FMMT597TC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FMMT597TC

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: FMMT597TC.pdf

Description:: TRANS PNP 300V 0.2A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Inventory:8,271

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Product details

Overview

FMMT597TC from Diodes Incorporated is a PNP high-voltage transistor in SOT23 package, rated for -300V V_CEO, -0.2A continuous collector current, and -1A peak pulse current. It serves as a high-voltage switching element in industrial power supplies, flyback controllers, and relay drivers where robust breakdown voltage and AEC-Q101 reliability are required.

For engineers reviewing the FMMT597TC datasheet, FMMT597TC pinout, FMMT597TC application, or FMMT597TC equivalent, key selection criteria include verified -300V BV_CEO, h_FE ≥ 100 at -100mA, V_CE(SAT) ≤ -250mV, thermal resistance R_θJA = 250°C/W, and SOT23 lead-free compliance per RoHS and AEC-Q101.

Technical Context

This PNP bipolar junction transistor operates with emitter-grounded configuration and supports high-voltage off-state blocking up to -300V across collector-emitter and collector-base terminals. Its static forward current transfer ratio (h_FE) remains ≥100 from -1mA to -100mA, enabling stable DC gain in linear and saturated switching modes.

The device delivers V_CE(SAT) ≤ -250mV at -100mA/-20mA drive and exhibits f_T = 75MHz, supporting moderate-speed switching in <100kHz power control circuits. Thermal performance is characterized with R_θJL = 197°C/W and derating to zero power at +150°C ambient on 15mm × 15mm 1oz FR4 copper.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-300V - enables use in 230VAC-derived offline power stages without cascading devices
I_C (cont.)	-0.2A - supports relay coil driving and low-power HV switch loads
h_FE	100 min @ -100mA - ensures reliable base drive margin in saturation
V_CE(SAT)	-250mV max @ -100mA - limits conduction loss to ≤25mW at rated current
R_θJA	250°C/W - requires minimal PCB copper area for thermal management
f_T	75MHz - supports switching up to ~10MHz with adequate gain margin
ESD HBM	4000V - provides handling robustness during assembly

Pinout & Package

SOT23-3 plastic package with matte tin-plated leads; 0.008g weight; UL 94V-0 flammability rating; moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emission terminal for majority carriers	Connected to system ground or higher potential rail in PNP high-side switch configurations
2 (Base)	Control electrode for carrier injection	Receives negative bias relative to emitter to turn on; requires current-limited drive due to β-dependent input impedance
3 (Collector)	Current collection node	Connected to high-voltage load; must maintain ≥8mm creepage distance per IEC 60950 in PCB layout

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade temperature cycling (-55°C to +150°C) and mechanical stress reliability
-300V BV_CEO	Eliminates need for series-connected transistors in 230VAC primary-side snubbers and flyback clamp circuits
Lead-free & Halogen-free	Complies with RoHS 2 and JEDEC J-STD-020 Level 1, enabling direct reflow without moisture bake
Low V_CE(SAT)	Reduces power dissipation in linear-regulator pass elements and constant-current LED drivers
High h_FE stability	Maintains ≥100 gain across -1mA to -100mA, simplifying base resistor selection in discrete logic interfaces

Applications

Industrial Power Supply

Automotive Body Control

Use Scenario: Flyback converter auxiliary winding rectifier and gate drive isolation stage.

IC Role / Device Role / Timing Role: High-voltage PNP switch controlling optocoupler LED current and feedback path enable/disable.

Use Value: -300V rating withstands reflected flyback spikes; SOT23 footprint saves board space vs. TO-92 alternatives.

Use Scenario: Window lift motor direction control via half-H-bridge discrete implementation.

IC Role / Device Role / Timing Role: High-side PNP switch enabling bidirectional motor current flow with isolated base drive.

Use Value: AEC-Q101 qualification ensures operation over full automotive temperature range; -250mV V_CE(SAT) minimizes heat generation in sealed modules.

LED Constant-Current Driver

Relay Interface Circuit

Use Scenario: Linear current regulator for high-brightness LED strings in signage and emergency lighting.

IC Role / Device Role / Timing Role: Pass transistor operating in active region, with emitter-follower configuration and precision shunt reference feedback.

Use Value: Stable h_FE ≥100 enables accurate current mirroring; low thermal resistance allows heatsink-free operation at 150mA.

Use Scenario: Microcontroller-driven 24VDC relay coil driver with reverse-EMF protection.

IC Role / Device Role / Timing Role: Saturated switch providing low-impedance path between relay coil and ground return.

Use Value: -1A I_CM handles relay inrush; -300V V_CEO prevents breakdown during coil flyback transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage PNP transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX653	V_CEO = -200V; h_FE = 100–300; SOT23 package	Limited to ≤200V systems; higher gain variability affects base drive design	Select when lower voltage rating suffices and tighter h_FE tolerance is not required
BC807-40	V_CEO = -45V; I_C = -500mA; same SOT23 footprint	Not suitable for >60V applications; higher continuous current but inadequate HV blocking	Choose only for low-voltage, high-current switching where -300V capability is unnecessary

Compared with ZTX653 and BC807-40, FMMT597TC uniquely delivers -300V blocking in SOT23 while maintaining AEC-Q101 qualification and consistent h_FE, making it irreplaceable in 230VAC-derived industrial and automotive HV control nodes.

Availability

FMMT597TC is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and LED constant-current drivers requiring stable component supply and long-term lifecycle support.

Supply support for FMMT597TC 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

FMMT597TC belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for reliable switching and linear operation in safety-critical, high-isolation industrial and automotive power interfaces.

FAQ

What is the maximum safe operating voltage for FMMT597TC in continuous DC applications?

The FMMT597TC is rated for -300V collector-emitter voltage (V_CEO) at T_A = +25°C, with derating above 25°C per the datasheet's thermal curve. For continuous DC use, the absolute maximum is -300V; however, design practice recommends limiting to ≤80% of rating (-240V) to ensure margin against transients and temperature-induced drift.

Does FMMT597TC require a heatsink in typical SOT23 mounting conditions?

No heatsink is required for FMMT597TC at ≤100mA continuous current on standard FR4 with 15mm × 15mm 1oz copper, as its R_θJA = 250°C/W and P_D = 500mW allow junction temperatures to remain below 150°C. At full 200mA, thermal simulation shows T_J ≈ 135°C-still within spec-but extended life requires enhanced copper pour or airflow.

Can FMMT597TC be used as a direct replacement for FMMT497 in complementary circuits?

No-FMMT597TC is PNP while FMMT497 is its NPN complement. They share identical SOT23 pinout (E-B-C), voltage/current ratings, and thermal specs, but polarity reversal means direct substitution would invert logic states and cause circuit failure unless board-level redesign accounts for emitter/collector swap and bias inversion.

Is FMMT597TC suitable for Class II (double-insulated) AC-DC adapter designs?

Yes-its -300V V_CEO and validated creepage/clearance compliance (per Diodes' AP02002 layout guidance) meet IEC 61347 and IEC 60335 requirements for reinforced insulation in Class II adapters. However, final certification requires PCB layout verification including minimum 4.0mm conductor spacing and proper solder mask definition around SOT23 pads.

FMMT597TC 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:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 200 mA

Voltage - Collector Emitter Breakdown (Max):: 300 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 20mA, 100mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 50mA, 10V

Power - Max:: 500 mW

Frequency - Transition:: 75MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

FMMT597TC FAQ

1.How can I place an order for FMMT597TC through Aetrix?

Please submit a Request for Quotation (RFQ) for FMMT597TC 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 FMMT597TC reliable?

The price and inventory of FMMT597TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT597TC is usually 5 days.

3.What payment methods are accepted for FMMT597TC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT597TC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FMMT597TC?

FMMT597TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FMMT597TC 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 FMMT597TC?

For technical support, including FMMT597TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT597TC requirements.

6.How does Aetrix verify that FMMT597TC is sourced from the original manufacturer or authorized distributors?

All FMMT597TC 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 FMMT597TC meets industry standards.

7.What is the process for return or replacement of FMMT597TC?

All FMMT597TC units undergo pre-shipment inspection (PSI). If there is an issue with FMMT597TC, 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 FMMT597TC part is unused and in its original packaging.

Return procedure for FMMT597TC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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