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Diodes Incorporated FMMT619TC
- Part No.:
- FMMT619TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT619TC.pdf
- Description:
- TRANS NPN 50V 2A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,294
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Product details
Overview
FMMT619TC from Diodes Incorporated is a 50V NPN silicon low-saturation transistor in SOT23 package, rated for 2A continuous collector current and 625mW power dissipation at +25°C. It delivers VCE(sat) < 200mV at 1A, RCE(sat) = 68mΩ, and hFE ≥ 200 at IC = 10mA/VCE = 2V - enabling efficient switching in high-current gate drive and DC-DC converter applications.
For engineers reviewing the FMMT619TC datasheet, FMMT619TC pinout, FMMT619TC application, or FMMT619TC equivalent, key selection criteria include verified low VCE(sat) under 2A load, SOT23 thermal performance with RθJA = 200°C/W (FR4, 25mm × 25mm), hFE characterization up to 6A, and complementary PNP pairing with FMMT720.
Technical Context
This NPN transistor operates as a low-loss switch in medium-power analog and digital control paths. Its BVCEO = 50V and VEBO = 7V support operation in 24V–48V systems with margin, while fT = 100MHz (typ.) enables fast switching in PWM-driven circuits up to several hundred kHz.
The device uses a planar epitaxial process optimized for saturation voltage stability across temperature. With hFE maintained ≥ 100 at IC = 2A/VCE = 2V and VBE(sat) = 0.87V (typ.) at IC = 2A/IB = 50mA, it sustains reliable drive capability without excessive base current overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50V - supports 24V/36V rail switching with 100% safety margin against transients |
| IC (continuous) | 2A - enables direct MOSFET gate charging for ≤10nF loads at 100kHz+ PWM |
| VCE(sat) | <200mV @ 1A - reduces conduction loss to <200mW per switch event |
| RCE(sat) | 68mΩ - simplifies thermal design vs. discrete alternatives requiring external current sense |
| hFE | 200–450 @ IC = 10mA–2A - ensures stable base drive across load range without gain collapse |
| fT | 100MHz (min) - supports clean edge integrity in <500ns turn-on/turn-off timing |
| PD | 625mW @ TA = +25°C - compatible with standard SOT23 PCB layouts using 25mm × 25mm 1oz copper |
Pinout & Package
Package: SOT23 (Type DN), surface-mount plastic package with matte tin-plated leads, UL 94V-0 rating, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; lowest impedance node for thermal coupling to PCB copper |
| 2 (Base) | Control input | Receives TTL/CMOS-compatible drive; requires 50mA max IB for full saturation at 2A IC |
| 3 (Collector) | Current source terminal | Switches positive rail to load; thermally coupled to lead frame for RθJL = 194°C/W path |
Key Features
| Feature | Design Value |
|---|---|
| Low saturation voltage | VCE(sat) < 200mV @ 1A enables sub-200mW conduction loss in high-duty-cycle switching |
| High current gain hold-up | hFE ≥ 100 at IC = 2A ensures robust drive margin without base current boosting |
| Complementary PNP pairing | FMMT720 matches VCEO, IC, and VCE(sat) specs for push-pull output stages |
| Automotive-grade variant available | FMMT619Q meets AEC-Q101 requirements for under-hood motor control and lighting modules |
Applications
| MOSFET Gate Driving | DC-DC Converter Switching |
|---|---|
Use Scenario: Driving N-channel MOSFET gates in synchronous buck converters operating at 200–500kHz. IC Role / Device Role / Timing Role: Low-side NPN switch providing fast, low-loss pull-down of gate node during dead-time intervals. Use Value: VCE(sat) < 200mV minimizes gate discharge energy loss; fT ≥ 100MHz ensures sub-200ns turn-off for precise timing control. | Use Scenario: High-efficiency 12V-to-5V step-down conversion in industrial power supplies with 2A output capability. IC Role / Device Role / Timing Role: Active clamp or auxiliary switch managing leakage energy and improving ZVS behavior. Use Value: RCE(sat) = 68mΩ reduces clamp conduction loss by >30% vs. standard small-signal transistors. |
| LED Constant-Current Regulation | Brushed DC Motor Control |
Use Scenario: Linear current regulation for high-brightness LED strings in architectural lighting systems. IC Role / Device Role / Timing Role: Pass transistor in adjustable constant-current sink configuration with feedback via sense resistor. Use Value: hFE ≥ 200 at IC = 1A ensures stable regulation without thermal runaway across -40°C to +105°C ambient. | Use Scenario: H-bridge low-side driver for 24V brushed DC motors in HVAC actuators and robotic joints. IC Role / Device Role / Timing Role: One quadrant switch controlling motor direction and speed via PWM duty cycle. Use Value: BVCEO = 50V withstands inductive kickback spikes up to 40V, eliminating need for external clamping diodes. |
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 |
|---|---|---|---|
| ZXTN2012ZTA | VCEO = 60V, VCE(sat) = 150mV @ 1A, hFE = 250 @ 1A - higher voltage rating but lower gain at 2A | Better for 48V bus designs; less suitable for high-gain linear regulation above 1.5A | Select when system transient tolerance exceeds 50V and thermal margin is constrained |
| MMBT6427LT1G | VCEO = 40V, VCE(sat) = 250mV @ 1A, hFE = 150 @ 1A - lower voltage and higher saturation loss | Limited to 24V systems; requires larger base drive for same collector current | Choose only if cost sensitivity outweighs efficiency and thermal performance requirements |
Compared with ZXTN2012ZTA and MMBT6427LT1G, FMMT619TC offers optimal balance of 50V rating, 200mV saturation, and 2A-rated gain - making it preferred for 24–36V industrial switching where reliability and thermal headroom are critical.
Availability
FMMT619TC is available at Aetrix Electronics and suitable for MOSFET gate driving, DC-DC converter switching, and brushed DC motor control requiring stable component supply and consistent SOT23 thermal performance.
Supply support for FMMT619TC 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 power management, signal integrity, and protection solutions.
FMMT619TC belongs to Diodes' FMMT series of low-saturation transistors designed specifically for high-efficiency switching in space-constrained industrial and automotive power stages.
FAQ
What is the maximum safe operating temperature for FMMT619TC?
The FMMT619TC has an operating junction temperature range of –55°C to +150°C. At ambient temperatures up to +85°C, its 625mW power dissipation rating remains valid on standard FR4 PCBs with 25mm × 25mm 1oz copper. Derating begins linearly beyond +25°C at 3.13mW/°C per the RθJA = 200°C/W specification.
Does FMMT619TC require a heatsink in typical SOT23 applications?
No external heatsink is required for FMMT619TC in standard SOT23 mounting configurations. Its RθJA = 200°C/W (on 25mm × 25mm FR4) allows full 2A operation at +25°C ambient without exceeding 150°C junction temperature. Thermal performance improves significantly with additional copper pour or internal layers.
How does FMMT619TC compare to FMMT619TA in terms of electrical performance?
FMMT619TC and FMMT619TA share identical die and electrical specifications - including VCEO, IC, VCE(sat), and hFE. The only difference is packaging: FMMT619TC ships in 13-inch reels (10,000 units), while FMMT619TA uses 7-inch reels (3,000 units). Both use SOT23 (Type DN) with identical pinout and thermal characteristics.
Can FMMT619TC be used in linear amplifier configurations?
FMMT619TC is optimized for switching operation, not linear amplification. While its hFE is characterized up to 6A, the datasheet provides no linearity, distortion, or frequency response data for analog gain stages. For linear applications, Diodes recommends dedicated RF or audio transistors such as the ZTX653 or BC847 series.
FMMT619TC 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 A
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Vce Saturation (Max) @ Ib, Ic:
- 220mV @ 50mA, 2A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 200 @ 1A, 2V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 165MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT619TC FAQ
1.How can I place an order for FMMT619TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT619TC 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 FMMT619TC reliable?
The price and inventory of FMMT619TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT619TC is usually 5 days.
3.What payment methods are accepted for FMMT619TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT619TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT619TC?
FMMT619TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT619TC 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 FMMT619TC?
For technical support, including FMMT619TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT619TC requirements.
6.How does Aetrix verify that FMMT619TC is sourced from the original manufacturer or authorized distributors?
All FMMT619TC 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 FMMT619TC meets industry standards.
7.What is the process for return or replacement of FMMT619TC?
All FMMT619TC units undergo pre-shipment inspection (PSI). If there is an issue with FMMT619TC, 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 FMMT619TC part is unused and in its original packaging.
Return procedure for FMMT619TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT619TC Tags
-
MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
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MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
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MMBT2222ALT1G
onsemi
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