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Diodes Incorporated FMMT718TC
- Part No.:
- FMMT718TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT718TC.pdf
- Description:
- TRANS PNP 20V 1.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,900
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Product details
Overview
FMMT718TC from Diodes Incorporated is a 20V PNP silicon low-saturation transistor in SOT23 package, delivering -1.5A continuous collector current, < -200mV VCE(sat) at -1A, and 97mΩ equivalent on-resistance. It serves as a high-current switch in gate-driving circuits for MOSFETs and IGBTs, DC-DC converters, and battery charging systems.
For engineers reviewing the FMMT718TC datasheet, FMMT718TC pinout, FMMT718TC application, or FMMT718TC equivalent, key selection criteria include verified -20V VCEO, pulsed -6A ICM, hFE ≥150 at -2A, thermal resistance of 155°C/W (note 6), and automotive-grade variant availability (FMMT718Q).
Technical Context
This PNP bipolar junction transistor operates with emitter-grounded switching topology and is characterized for stable hFE hold-up up to -6A. Its low VCE(sat) and RCE(SAT) enable efficient power switching in high-duty-cycle applications.
The device features JEDEC-compliant ESD robustness (4kV HBM), operates across -55°C to +150°C, and uses matte tin-plated leads solderable per MIL-STD-202 Method 208 - supporting reflow and wave soldering in industrial and automotive PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -20V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC (continuous) | -1.5A - steady-state current handling capacity without thermal runaway under 25°C ambient |
| VCE(sat) | < -200mV @ -1A - ensures minimal conduction loss and heat generation during saturation |
| RCE(SAT) | 97mΩ - low equivalent on-resistance enables high-efficiency switching in compact power stages |
| hFE | 15–30 @ -6A - verified current gain retention at peak pulse conditions for reliable drive capability |
| fT | 150–180MHz - sufficient transition frequency for fast switching in DC-DC controllers up to ~1MHz |
| PD (note 6) | 806mW - maximum short-duration power dissipation on FR4 PCB with 1 oz copper |
Pinout & Package
Package: SOT23 (Type DN), surface-mount plastic case with UL 94V-0 flammability rating, moisture sensitivity level 1, and 0.008g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal | Connected to ground or higher-potential rail in high-side switch configurations |
| 2 (Base) | Control input | Receives negative bias current to turn on; requires -50mA max for full saturation at -1.5A |
| 3 (Collector) | Current sink terminal | Drives load toward ground; handles -6A peak pulses with controlled SOA |
Key Features
| Feature | Design Value |
|---|---|
| Low saturation voltage | VCE(sat) ≤ -200mV at -1A enables <200mW conduction loss in 1A switching paths |
| High pulse current capability | ICM = -6A supports transient load surges in motor gate drives and hot-swap circuits |
| Thermal performance | RθJA = 155°C/W (t ≤ 5 sec) allows sustained operation near 100°C ambient in space-constrained layouts |
| Automotive qualification path | FMMT718Q variant available with AEC-Q101 qualification, PPAP support, and IATF 16949 manufacturing |
Applications
| Gate Driver for Power Switches | DC-DC Converter Primary Switch |
|---|---|
Use Scenario: Driving gates of N-channel MOSFETs or IGBTs in half-bridge inverters and motor control modules. IC Role / Device Role / Timing Role: PNP switch providing active pull-down and fast turn-off of power device gates. Use Value: Low VCE(sat) and 270ns toff reduce switching losses and improve gate drive fidelity at 100–500kHz. | Use Scenario: High-side synchronous rectifier or primary-side switch in buck/boost regulators. IC Role / Device Role / Timing Role: Fast-switching PNP transistor controlling energy transfer in non-isolated topologies. Use Value: 150MHz fT and 68ns ton support stable operation up to 1MHz switching frequency with minimal delay skew. |
| Battery Charging Control | Industrial Load Switch |
Use Scenario: Enabling/disabling charging current paths in multi-cell Li-ion battery management systems. IC Role / Device Role / Timing Role: Precision current switch regulating charge flow between charger IC and battery pack. Use Value: -20V VCEO and -7V VEBO ensure safe operation across 12V–19.2V battery stacks with reverse polarity protection. | Use Scenario: Solid-state replacement for mechanical relays in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: Robust discrete switch handling 1.5A continuous loads with overcurrent and thermal margin. Use Value: 625mW steady-state power rating and -55°C to +150°C operating range support uncooled industrial enclosure deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP low-saturation transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25050DFH | Higher VCEO (-50V), lower IC (-0.5A), SOT23-3L package with different pinout (E-B-C vs C-B-E) | More suitable for higher-voltage, lower-current bias networks; not drop-in for gate drive due to pin mismatch | Select only if system requires >30V blocking and layout accommodates revised pin assignment |
| DMT3005LKQ | PNP MOSFET (not BJT); -30V VDS, -5A ID, no base current requirement, but higher gate charge and slower switching | Better for static switching; unsuitable for linear-mode or high-frequency gate driving due to lack of fT and hFE linearity | Prefer for always-on load switching; avoid where precise current gain or fast edge control is needed |
Compared with ZXTN25050DFH and DMT3005LKQ, FMMT718TC offers optimal balance of -20V rating, -1.5A continuous current, sub-200mV saturation, and 150MHz bandwidth - making it uniquely suited for high-efficiency, medium-voltage gate driving where BJT linearity and speed matter.
Availability
FMMT718TC is available at Aetrix Electronics and suitable for gate drivers, DC-DC converters, and battery charging circuits requiring stable component supply, RoHS/Green compliance, and SOT23 footprint compatibility.
Supply support for FMMT718TC 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.
FMMT718TC belongs to Diodes' FMMT series of low-saturation transistors, engineered specifically for high-efficiency power switching in space-constrained, thermally demanding applications such as automotive body electronics and industrial power supplies.
FAQ
What is the maximum allowable base current for FMMT718TC?
The absolute maximum base current is -500mA, but typical design practice limits IB to -50mA for -1.5A collector current to maintain safe SOA and prevent secondary breakdown. The datasheet specifies VBE(sat) = -0.87V at -1.5A/-50mA, confirming this as the validated drive condition for full saturation.
Does FMMT718TC support automotive qualification?
FMMT718TC itself is not AEC-Q101 qualified, but Diodes offers the FMMT718Q variant - identical electrically and mechanically - which is fully qualified to AEC-Q101, manufactured in IATF 16949 facilities, and PPAP-capable for automotive applications.
How does thermal resistance change between steady-state and short-pulse operation?
RθJA is 200°C/W for steady-state (note 5) and improves to 155°C/W for t ≤ 5 sec (note 6), reflecting reduced thermal impedance during transient operation. This allows brief overloads up to 806mW without exceeding junction temperature limits, critical for surge handling in charging and motor start circuits.
Can FMMT718TC replace an NPN transistor in the same circuit?
No - FMMT718TC is a PNP device with complementary polarity to NPN types like FMMT618. Direct substitution would invert logic and require redesign of bias network, supply rails, and signal referencing. Use only in circuits designed for PNP high-side or emitter-follower configurations.
FMMT718TC 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):
- 1.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 20 V
- Vce Saturation (Max) @ Ib, Ic:
- 220mV @ 50mA, 1.5A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 100mA, 2V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 180MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT718TC FAQ
1.How can I place an order for FMMT718TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT718TC 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 FMMT718TC reliable?
The price and inventory of FMMT718TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT718TC is usually 5 days.
3.What payment methods are accepted for FMMT718TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT718TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT718TC?
FMMT718TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT718TC 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 FMMT718TC?
For technical support, including FMMT718TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT718TC requirements.
6.How does Aetrix verify that FMMT718TC is sourced from the original manufacturer or authorized distributors?
All FMMT718TC 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 FMMT718TC meets industry standards.
7.What is the process for return or replacement of FMMT718TC?
All FMMT718TC units undergo pre-shipment inspection (PSI). If there is an issue with FMMT718TC, 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 FMMT718TC part is unused and in its original packaging.
Return procedure for FMMT718TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT718TC Tags
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