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Diodes Incorporated FMMT619QTA
- Part No.:
- FMMT619QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT619QTA.pdf
- Description:
- TRANS NPN 50V 2A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,930
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Product details
Overview
FMMT619QTA from Diodes Incorporated is a 50V NPN silicon low-saturation transistor in SOT23 package, designed for high-efficiency switching in power-conversion circuits. It delivers 2A continuous collector current, 625mW power dissipation, VCE(sat) < 200mV at 1A, RCE(sat) = 68mΩ, and hFE ≥ 200 at 1A - enabling compact, low-loss gate driving and motor control stages.
For engineers reviewing the FMMT619QTA datasheet, FMMT619QTA pinout, FMMT619QTA application, or FMMT619QTA equivalent, key selection criteria include verified low VCE(sat) under 1A–2A load, stable hFE up to 6A, thermal resistance of 155°C/W (short pulse), SOT23 lead-free compliance, and complementary pairing with FMMT720.
Technical Context
This NPN transistor operates as a saturated switch in DC-DC converters and LED/motor drivers, where low on-resistance and fast switching (ton = 170ns, toff = 750ns) minimize conduction and transition losses. Its BVCEO = 50V and VEBO = 7V support robust operation across industrial input rails and gate-drive voltage margins.
The device is characterized for hFE from 10mA to 6A, ensuring predictable current gain during transient overloads. Thermal design leverages RθJL = 194°C/W and RθJA = 155°C/W (t ≤ 5s), validated on 25mm × 25mm FR4 with 1oz copper - critical for sustained 2A operation in space-constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50V - supports 24V/36V bus systems with 100% margin against transients |
| IC (continuous) | 2A - enables direct drive of small MOSFET gates or 1W LED strings without heatsinking |
| VCE(sat) | <200mV @ 1A - reduces conduction loss to <200mW, improving efficiency in PWM stages |
| RCE(sat) | 68mΩ - provides MOSFET-like on-resistance for low-voltage switching nodes |
| hFE | 200–450 @ 1–6A - ensures reliable saturation with modest base drive (e.g., 10mA for 1A IC) |
| fT | 100–165MHz - supports clean switching up to ~10MHz PWM frequencies |
| PD (pulsed) | 806mW - allows short-duration peak loads beyond steady-state 625mW limit |
Pinout & Package
Package: SOT23 (Type DN), surface-mount, green molding compound (UL 94V-0), matte tin-plated leads, 0.008g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; requires low-impedance PCB trace for thermal and current handling |
| 2 (Base) | Control input | Driven by logic-level or op-amp output; 10mA base current sufficient for 1A collector conduction |
| 3 (Collector) | Current source terminal | Connects to load anode or MOSFET gate; collector lead serves as primary thermal path (RθJL = 194°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | ≤200mV at 1A enables sub-200mW conduction loss in 24V systems |
| High-current hFE characterization | Validated up to 6A - guarantees gain stability during motor startup surges |
| SOT23 thermal performance | RθJA = 155°C/W (t ≤ 5s) supports burst-mode operation without derating |
| Lead-free & halogen-free | RoHS 3 compliant with Br+Cl <1500ppm - meets automotive and industrial environmental mandates |
Applications
| MOSFET Gate Driving | DC-DC Converter Switching |
|---|---|
Use Scenario: Driving the gate of a 30V N-channel MOSFET in a synchronous buck converter. IC Role / Device Role / Timing Role: Low-side NPN switch providing fast turn-on/turn-off of the high-side MOSFET gate via bootstrap circuitry. Use Value: 170ns turn-on time and 68mΩ RCE(sat) reduce gate charge time and minimize shoot-through risk during transitions. | Use Scenario: Active clamping or auxiliary switching in isolated flyback or forward converters. IC Role / Device Role / Timing Role: Secondary-side saturated switch controlling snubber energy dissipation or synchronous rectification timing. Use Value: 50V VCEO withstands reflected voltage spikes; 2A IC handles peak clamp currents without saturation collapse. |
| LED Constant-Current Driver | Brushed DC Motor Control |
Use Scenario: Linear current regulation for high-brightness LEDs in architectural lighting modules. IC Role / Device Role / Timing Role: Pass transistor in adjustable constant-current sink configuration, controlled by op-amp feedback. Use Value: Stable hFE across temperature ensures ±3% current accuracy; low VCE(sat) limits thermal rise in enclosed housings. | Use Scenario: H-bridge low-side driver for 12V brushed motors in HVAC actuators or industrial valves. IC Role / Device Role / Timing Role: One quadrant switch enabling bidirectional control when paired with complementary PNP (FMMT720). Use Value: 2A continuous rating supports 500mA–1.5A motor stall currents; -55°C to +150°C operating range ensures reliability in under-hood environments. |
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 |
|---|---|---|---|
| ZXTN2010Z | VCEO = 60V, VCE(sat) = 150mV @ 1A, hFE = 250 @ 1A - higher voltage rating but lower max IC (1.5A) | Better for 48V systems; unsuitable for sustained 2A loads | Select if system requires >50V breakdown margin and can accept reduced current capacity |
| MMBT6427 | VCEO = 45V, VCE(sat) = 250mV @ 1A, hFE = 150 @ 1A - lower voltage, higher saturation, lower gain | Limited to 24V designs with relaxed efficiency targets | Choose only for cost-sensitive, non-thermal-critical 24V applications where 200mV VCE(sat) is acceptable |
Compared with ZXTN2010Z and MMBT6427, FMMT619QTA uniquely balances 50V rating, 2A current, and sub-200mV saturation - making it optimal for industrial 24–36V power stages where both headroom and thermal efficiency are constrained.
Availability
FMMT619QTA is available at Aetrix Electronics and suitable for MOSFET gate driving, DC-DC converter switching, and brushed DC motor control requiring stable component supply, RoHS-compliant packaging, and SOT23 thermal performance.
Supply support for FMMT619QTA 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 and signal integrity solutions for industrial, computing, and automotive markets.
FMMT619QTA belongs to Diodes' FMMT series of low-saturation bipolar transistors, engineered specifically for high-efficiency switching in space-constrained power conversion and interface circuits.
FAQ
What is the maximum continuous collector current for FMMT619QTA?
The FMMT619QTA supports 2A continuous collector current at TA = +25°C on a 25mm × 25mm FR4 board with 1oz copper. Derating begins above 25°C per Figure 2 in the datasheet, reaching zero at 150°C ambient. This rating assumes proper PCB copper pour and airflow conditions typical in industrial power modules.
Is FMMT619QTA pin-compatible with FMMT619TA or FMMT619TC?
Yes - all FMMT619 variants (QTA, TA, TC) share identical SOT23 (Type DN) mechanical outline, pin assignment (E-B-C), and electrical specifications. The suffix denotes tape-and-reel packaging: QTA = 7-inch reel, 3,000 units; TA = same; TC = 13-inch reel, 10,000 units. No functional or layout differences exist between them.
Does FMMT619QTA meet automotive qualification standards?
No - FMMT619QTA is an industrial-grade part. Diodes offers the automotive-qualified FMMT619Q (separate datasheet DS33237), which undergoes AEC-Q101 stress testing and supports extended temperature operation (-40°C to +150°C). FMMT619QTA is rated for -55°C to +150°C but lacks AEC-Q101 certification and automotive PPAP documentation.
How does the hFE behavior change at high collector currents?
hFE remains ≥200 up to IC = 2A (VCE = 2V), then decreases to ≥40 at IC = 6A - confirming robust high-current gain hold-up. This allows reliable saturation with fixed base drive (e.g., 50mA IB for 2A IC), avoiding thermal runaway in motor-start or inrush scenarios where gain collapse would otherwise occur.
FMMT619QTA 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:
- 300 @ 200mA, 2V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 165MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT619QTA FAQ
1.How can I place an order for FMMT619QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT619QTA 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 FMMT619QTA reliable?
The price and inventory of FMMT619QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT619QTA is usually 5 days.
3.What payment methods are accepted for FMMT619QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT619QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT619QTA?
FMMT619QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT619QTA 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 FMMT619QTA?
For technical support, including FMMT619QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT619QTA requirements.
6.How does Aetrix verify that FMMT619QTA is sourced from the original manufacturer or authorized distributors?
All FMMT619QTA 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 FMMT619QTA meets industry standards.
7.What is the process for return or replacement of FMMT619QTA?
All FMMT619QTA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT619QTA, 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 FMMT619QTA part is unused and in its original packaging.
Return procedure for FMMT619QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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