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Diodes Incorporated FMMT618TA
- Part No.:
- FMMT618TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT618TA.pdf
- Description:
- TRANS NPN 20V 2.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,155
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Product details
Overview
FMMT618TA from Diodes Incorporated is a 20V NPN silicon low-saturation transistor in SOT23 package, designed for high-current switching with 2.5A continuous collector current, 50mΩ RCE(SAT), and AEC-Q101 qualification. It serves as a compact, thermally efficient switch in DC-DC modules, gate drivers, and LED drivers where low conduction loss and fast switching are critical.
For engineers reviewing the FMMT618TA datasheet, FMMT618TA pinout, FMMT618TA application, or FMMT618TA equivalent, key selection criteria include VCEO = 20V, IC = 2.5A, RCE(SAT) ≤ 150mΩ at 2.5A/50mA drive, hFE ≥ 150 up to 2A, and SOT23 thermal performance under pulsed and continuous operation.
Technical Context
This NPN transistor operates as a saturated switch with characterized hFE up to 6A and guaranteed VCE(SAT) ≤ 150mV at IC = 2.5A and IB = 50mA. Its 20V VCEO rating supports 12V rail switching, while fT = 100–140MHz enables use in medium-frequency PWM control loops.
Thermal design is enabled by RθJA = 200°C/W (steady-state) and 155°C/W (short-pulse), with junction-to-lead resistance of 194°C/W. The device is fully RoHS-compliant, halogen- and antimony-free, and qualified per AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 20V - Maximum safe collector-emitter voltage during saturation, suitable for 12V system switching |
| IC (continuous) | 2.5A - Continuous load current capability without derating at TA = 25°C on standard PCB |
| RCE(SAT) | ≤150mΩ - Low on-resistance ensures <375mW conduction loss at 2.5A, minimizing heat generation |
| hFE | 150 min @ IC = 2A - Sustains high current gain under heavy load, reducing required base drive current |
| fT | 100–140MHz - Supports fast turn-on/turn-off (ton = 170ns, toff = 400ns) in PWM-driven applications |
| PD | 625mW - Power dissipation limit on 25mm × 25mm FR4 board with 1 oz copper, defining thermal layout constraints |
Pinout & Package
Package: SOT23 - Surface-mount plastic package with matte tin-plated leads, moisture sensitivity level 1, UL 94V-0 rated, weight ≈ 0.008g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current return path | Low-impedance connection to ground or low-side reference; tied directly to PCB copper pour for thermal relief |
| 2 (Base) | Control input | Receives TTL/CMOS-compatible drive; requires ≥50mA peak for full saturation at 2.5A load |
| 3 (Collector) | Switched output | Connected to load or power rail; solder-point thermal path enables RθJL = 194°C/W for improved pulse handling |
Key Features
| Feature | Design Value |
|---|---|
| Low saturation voltage | VCE(SAT) ≤ 150mV at 2.5A/50mA - Reduces conduction loss and self-heating in high-duty-cycle switching |
| AEC-Q101 qualification | Qualified for automotive applications including engine control and body electronics - ensures reliability under temperature cycling and vibration stress |
| High current gain at 2A | hFE ≥ 150 @ IC = 2A - Enables direct microcontroller GPIO drive without external buffer stages |
| Green construction | Halogen- and antimony-free, RoHS-compliant - Meets EU environmental directives and eliminates corrosive outgassing in sealed assemblies |
Applications
| DC-DC Converter Switching Stage | LED Constant-Current Driver |
|---|---|
Use Scenario: High-efficiency buck converter operating at 200–500kHz with 12V input and 3–5A output. IC Role / Device Role / Timing Role: Low-side synchronous rectifier switch replacing Schottky diode to reduce forward drop and improve efficiency. Use Value: 50mΩ RCE(SAT) cuts conduction loss by >60% vs. typical 0.4V Schottky, enabling >92% efficiency at 3A. | Use Scenario: Automotive interior lighting module driving 10–20 white LEDs in series from 12V battery supply. IC Role / Device Role / Timing Role: Constant-current sink transistor controlled by PWM dimming signal. Use Value: Stable hFE across –40°C to +105°C ensures consistent LED current regulation without feedback compensation. |
| Gate Driver for Power MOSFETs | Industrial Solenoid Control |
Use Scenario: Low-voltage logic-level gate driver stage interfacing MCU GPIO to 30V N-channel power MOSFET. IC Role / Device Role / Timing Role: Fast-switching NPN pull-down element providing rapid gate discharge (toff = 400ns). Use Value: 140MHz fT and low Cobo = 23pF minimize Miller effect, enabling clean 10–20ns gate fall times. | Use Scenario: PLC output module switching 24V DC solenoids drawing up to 2A steady-state current. IC Role / Device Role / Timing Role: Robust, thermally stable switching transistor with integrated transient suppression capability. Use Value: AEC-Q101 qualification and 150°C max TJ allow reliable operation in unventilated industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN low-saturation transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN2020ZTA | VCEO = 20V, IC = 3A, RCE(SAT) = 35mΩ @ 2A - lower saturation but higher leakage (ICBO = 200nA vs. 100nA) | Better for ultra-low-loss 2A switching; less suitable for low-leakage standby circuits | Prefer when minimizing conduction loss dominates over leakage-critical sleep modes |
| MMBT6427LT1G | VCEO = 15V, IC = 1.5A, RCE(SAT) = 120mΩ @ 1A - lower voltage rating and reduced current capacity | Limited to 5–12V systems with <1.5A loads; not AEC-Q101 qualified | Select only for cost-sensitive non-automotive consumer applications with relaxed voltage/current margins |
Compared with ZXTN2020ZTA and MMBT6427LT1G, FMMT618TA delivers balanced performance: AEC-Q101 compliance and 2.5A/20V capability fill the mid-range gap between high-performance and general-purpose transistors, making it optimal for automotive and industrial 12V switching where reliability and thermal margin are prioritized.
Availability
FMMT618TA is available at Aetrix Electronics and suitable for DC-DC modules, gate drivers, and LED drivers requiring stable component supply, automotive-grade traceability, and long-term production continuity.
Supply support for FMMT618TA 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.
The FMMT618TA belongs to Diodes' AEC-Q101-qualified low-saturation transistor product line, engineered for robust, thermally efficient switching in space-constrained power conversion and load-driving applications.
FAQ
What is the maximum continuous collector current for FMMT618TA at 70°C ambient?
At TA = 70°C, the maximum continuous collector current is derated to approximately 1.8A based on the 200°C/W RθJA and 150°C max junction temperature. This assumes mounting on a 25mm × 25mm FR4 board with 1 oz copper and still air conditions, per Note 6 in the datasheet.
Is FMMT618TA pin-compatible with its complementary PNP counterpart FMMT718TA?
Yes - both devices share identical SOT23 pinout (Emitter-Base-Collector), enabling direct layout reuse in push-pull or H-bridge configurations. However, FMMT718TA has VCEO = –20V and IC = –2.5A, requiring reversed biasing and matching base drive polarity.
Does FMMT618TA require a base resistor when driven by a 3.3V microcontroller GPIO?
Yes - a base resistor is required to limit IB to ≤500mA and ensure proper saturation. For 2.5A IC and hFE ≥ 150, minimum IB = 16.7mA; with 3.3V GPIO and VBE(sat) ≈ 0.89V, a 150Ω resistor delivers ~16.7mA and satisfies safe drive requirements.
Can FMMT618TA be used in linear regulator pass transistor applications?
No - it is optimized for saturated switching, not linear operation. Its RCE(SAT) specification and thermal derating curves assume pulsed or switched duty cycles. Linear use would exceed safe operating area limits due to simultaneous high VCE and IC, risking thermal runaway without active heatsinking.
FMMT618TA 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:
- NPN
- Current - Collector (Ic) (Max):
- 2.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 20 V
- Vce Saturation (Max) @ Ib, Ic:
- 200mV @ 50mA, 2.5A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 200 @ 2A, 2V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 140MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT618TA FAQ
1.How can I place an order for FMMT618TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT618TA 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 FMMT618TA reliable?
The price and inventory of FMMT618TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT618TA is usually 5 days.
3.What payment methods are accepted for FMMT618TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT618TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT618TA?
FMMT618TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT618TA 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 FMMT618TA?
For technical support, including FMMT618TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT618TA requirements.
6.How does Aetrix verify that FMMT618TA is sourced from the original manufacturer or authorized distributors?
All FMMT618TA 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 FMMT618TA meets industry standards.
7.What is the process for return or replacement of FMMT618TA?
All FMMT618TA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT618TA, 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 FMMT618TA part is unused and in its original packaging.
Return procedure for FMMT618TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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