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

Diodes Incorporated FMMT597TA

Name: FMMT597TA
Brand: Diodes Incorporated
SKU: FMMT597TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FMMT597TA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: FMMT597TA.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:31,492

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Product details

Overview

FMMT597TA from Diodes Incorporated is a PNP high-voltage bipolar junction 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 converters, and relay drivers where robust breakdown voltage and AEC-Q101 reliability are required.

For engineers reviewing the FMMT597TA datasheet, FMMT597TA pinout, FMMT597TA application, or FMMT597TA 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 transistor operates with emitter-grounded configuration and supports high-voltage off-state blocking up to -300V across collector-emitter and collector-base terminals. Its f_T of 75MHz enables use in moderate-speed switching applications, while low leakage (I_CBO < 1nA at -250V) ensures stable biasing in high-impedance circuits.

The device uses a planar epitaxial structure with optimized doping profiles to achieve both high breakdown voltage and usable current gain. Thermal performance is characterized with 15mm × 15mm 1oz copper on FR4, yielding 500mW steady-state power dissipation and defined transient thermal impedance curves for pulsed operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-300V - Enables direct replacement of legacy high-voltage PNP transistors in offline switch-mode power supply snubber and gate drive circuits.
I_C (cont.)	-0.2A - Supports sustained load switching in automotive body control modules and industrial solenoid drivers without derating below 100°C ambient.
h_FE	100–300 - Provides predictable base drive requirements (e.g., -20mA IB for -100mA IC), simplifying discrete driver stage design.
V_CE(SAT)	-250mV @ -100mA/-20mA - Limits conduction loss to ≤25mW at rated current, critical for thermally constrained SOT23 PCB layouts.
R_θJA	250°C/W - Requires minimum 15mm×15mm 1oz copper pad for full 500mW power handling; derates linearly above +25°C ambient.
ESD HBM	4000V - Meets IEC 61000-4-2 Level 3 immunity requirements for assembly and field operation in industrial environments.

Pinout & Package

SOT23 plastic surface-mount package with matte tin-plated leads; moisture sensitivity level 1 per J-STD-020; weight ≈ 0.008g.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Reference node for PNP operation; connected to higher potential rail in high-side switch configurations.
2 (Base)	Control input	Receives negative base current to turn on; requires current-limiting resistor referenced to emitter potential.
3 (Collector)	Output terminal	Carries load current toward ground; must maintain ≥3mm creepage/clearance from other traces in >250V applications.

Key Features

Feature	Design Value
High voltage blocking	BV_CEO = -300V - Eliminates need for series-connected transistors in 230VAC rectified bus switching.
AEC-Q101 qualification	Qualified for automotive underhood applications - supports deployment in engine control, lighting, and HVAC modules without additional stress screening.
Green compound packaging	Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb) - meets EU ELV and China RoHS environmental mandates.
Low leakage	I_CES < 1nA @ -250V - Ensures stable off-state behavior in high-impedance feedback networks and precision timing circuits.

Applications

Industrial Power Supply

Automotive Relay Driver

Use Scenario: Flyback converter auxiliary winding rectifier and gate drive circuit in 230VAC-input SMPS.

IC Role / Device Role / Timing Role: High-voltage PNP switch controlling optocoupler bias and MOSFET gate pull-up during startup and fault conditions.

Use Value: -300V rating avoids external voltage clamping; SOT23 footprint saves board space versus TO-92 alternatives.

Use Scenario: Driving 12V automotive relays in body control units with reverse-battery protection.

IC Role / Device Role / Timing Role: High-side switch enabling controlled coil energization while isolating microcontroller GPIO from inductive kickback.

Use Value: AEC-Q101 qualification ensures reliability over temperature cycling; -250mV V_CE(SAT) minimizes heat generation in sealed enclosures.

LED Streetlight Driver

Industrial Solenoid Control

Use Scenario: Constant-current regulation and overvoltage protection in outdoor LED driver secondary side.

IC Role / Device Role / Timing Role: PNP pass transistor in linear current sink configuration, shunting excess current during dimming transitions.

Use Value: Stable h_FE across -55°C to +150°C enables consistent current setting without active compensation.

Use Scenario: Controlling 24VDC industrial solenoids in PLC I/O modules with fast turn-off response.

IC Role / Device Role / Timing Role: Discrete high-voltage switch interfacing FPGA outputs to inductive loads requiring >200V flyback suppression.

Use Value: -1A I_CM withstands repetitive inductive spikes; low C_obo (10pF) reduces capacitive coupling noise in dense I/O layouts.

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 = -300V, I_C = -0.5A, h_FE = 100–300, SOT89 package	Larger thermal mass and higher current capability but requires larger PCB area and different layout	Select when >0.2A continuous current or improved thermal margin is needed; not drop-in compatible due to 3-pin SOT89 footprint
FMMT591	Complementary NPN type, same SOT23 package, V_CEO = +300V, I_C = +0.2A	Used in push-pull or complementary switching stages rather than standalone high-side switch	Choose for matched pair designs requiring symmetrical voltage/current ratings; shares identical thermal and mechanical specs

Compared with ZTX653 and FMMT591, FMMT597TA uniquely balances ultra-high voltage blocking, compact SOT23 size, and AEC-Q101 qualification-making it optimal for space-constrained automotive and industrial high-side switching where reliability and footprint are co-prioritized.

Availability

FMMT597TA is available at Aetrix Electronics and suitable for industrial power supplies, automotive relay drivers, LED streetlight drivers, and industrial solenoid control systems requiring stable component supply and long-term lifecycle support.

Supply support for FMMT597TA 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 the Americas.

FMMT597TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for reliable switching in automotive, industrial, and lighting applications demanding >250V breakdown and AEC-Q101 compliance.

FAQ

What is the maximum safe operating voltage for FMMT597TA in continuous DC applications?

The absolute maximum collector-emitter voltage (V_CEO) is -300V at T_A = +25°C. For continuous DC operation, design must maintain ≥20% voltage margin (≤ -240V) and ensure PCB creepage/clearance complies with IEC 60664-1 for working voltages above 250V. Derating applies above +25°C ambient per the published derating curve.

Can FMMT597TA replace older PN2907 or MPSA92 transistors in existing designs?

FMMT597TA offers superior -300V V_CEO versus PN2907 (-60V) and MPSA92 (-300V but TO-92 only), with identical SOT23 footprint and compatible pinout (E-B-C). However, its lower I_C (-0.2A vs. -0.5A for MPSA92) requires verification of peak current demands before substitution in high-current legacy circuits.

How does the AEC-Q101 qualification impact FMMT597TA's use in non-automotive applications?

AEC-Q101 qualification subjects FMMT597TA to accelerated stress tests including HTSL, TC, and ESD-resulting in proven reliability for 15+ years in harsh environments. This makes it preferred for industrial equipment, outdoor lighting, and medical auxiliary power where extended lifetime and failure rate predictability are critical, even outside automotive contexts.

What thermal design guidance applies when using FMMT597TA at its full 500mW power rating?

To sustain 500mW, the device must be mounted on a 15mm × 15mm 1oz copper pad on FR4 with no adjacent heat sources. The measured R_θJA of 250°C/W assumes still air; forced airflow or internal layer copper pours reduce junction temperature. Exceeding 150°C T_J risks parametric shift and long-term degradation.

FMMT597TA 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):: 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

FMMT597TA FAQ

1.How can I place an order for FMMT597TA through Aetrix?

Please submit a Request for Quotation (RFQ) for FMMT597TA 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 FMMT597TA reliable?

The price and inventory of FMMT597TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT597TA is usually 5 days.

3.What payment methods are accepted for FMMT597TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT597TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FMMT597TA?

FMMT597TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FMMT597TA 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 FMMT597TA?

For technical support, including FMMT597TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT597TA requirements.

6.How does Aetrix verify that FMMT597TA is sourced from the original manufacturer or authorized distributors?

All FMMT597TA 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 FMMT597TA meets industry standards.

7.What is the process for return or replacement of FMMT597TA?

All FMMT597TA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT597TA, 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 FMMT597TA part is unused and in its original packaging.

Return procedure for FMMT597TA:

1.Submit a request within 90 days.

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

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