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Diodes Incorporated FMMT6517TA
- Part No.:
- FMMT6517TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT6517TA.pdf
- Description:
- TRANS NPN 350V 0.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:418,926
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Product details
Overview
FMMT6517TA from Diodes Incorporated is a 350V NPN high-voltage transistor in SOT23 package, rated for 500mA collector current and 350mW power dissipation, with hFE ≥20 at IC=1mA and VCE=10V. It serves as a high-voltage switching element in flyback snubbers, relay drivers, and industrial power supply protection circuits.
For engineers reviewing the FMMT6517TA datasheet, FMMT6517TA pinout, FMMT6517TA application, or FMMT6517TA equivalent, key selection criteria include BVCEO ≥350V, IC=500mA capability, SOT23 thermal resistance (RθJA = 403°C/W on minimal pad), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This NPN bipolar junction transistor operates with a minimum collector-emitter breakdown voltage of 350V and supports continuous collector currents up to 500mA. Its gain (hFE) ranges from 20–200 depending on bias conditions, with VCE(SAT) ≤0.35V at IC=20mA/IB=2mA.
Designed for high-voltage switching, it features low output capacitance (COBO = 6pF @ 20V), fT = 50MHz, and ESD robustness (HBM = 4kV). Thermal performance is specified for both minimal PCB pad (RθJA = 403°C/W) and enhanced 15mm×15mm copper layout (RθJA = 357°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO / VCEO | 350V - enables use in >300V DC bus switching and flyback clamp circuits |
| IC(max) | 500mA - supports medium-power load switching without external amplification |
| PD(max) | 350mW - requires thermal derating above 25°C ambient per published curve |
| hFE | 20–200 - provides design flexibility across low- and medium-current drive stages |
| VCE(SAT) | ≤0.35V @ IC=20mA/IB=2mA - minimizes conduction loss in saturated switch mode |
| fT | 50MHz - supports moderate-speed switching up to ~5–10MHz practical operation |
| ESD HBM | 4,000V - enhances handling robustness during assembly and board-level integration |
Pinout & Package
SOT23 plastic surface-mount package with matte tin-plated leads; moisture sensitivity level 1; weight ≈0.008g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; must maintain <7V reverse bias vs base |
| 2 (Base) | Control input | Drives transistor into saturation or cutoff; IB ≤25mA absolute max |
| 3 (Collector) | High-voltage output node | Handles up to 350V potential; connects to inductive loads or HV rails |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling and humidity testing |
| 350V breakdown rating | Enables direct interface with 230VAC rectified rails and telecom -48V systems with margin |
| Lead-free & halogen-free | Complies with RoHS 3 (2015/863/EU) and meets "Green" definition (<900ppm Br/Cl, <1000ppm Sb) |
| SOT23 footprint | Enables high-density PCB layouts while maintaining manufacturability on standard SMT lines |
Applications
| Industrial Power Supply Protection | Automotive Relay Driver |
|---|---|
Use Scenario: Overvoltage clamping in offline SMPS feedback loops and Zener-assisted crowbar circuits. IC Role / Device Role / Timing Role: High-voltage NPN switch triggering protection latch when primary-side voltage exceeds threshold. Use Value: 350V BVCEO ensures reliable operation across universal AC input ranges (85–265VAC) with safety margin. | Use Scenario: Driving 12V/24V automotive relays in body control modules and lighting controllers. IC Role / Device Role / Timing Role: Low-side switch controlling relay coil current with fast turn-on/turn-off via base drive. Use Value: AEC-Q101 qualification guarantees stable operation over -40°C to +125°C ambient with no parameter drift. |
| Flyback Snubber Circuit | High-Voltage Signal Level Shifting |
Use Scenario: Absorbing leakage inductance energy in flyback transformer secondary-side snubbers. IC Role / Device Role / Timing Role: Fast-switching NPN clamp that conducts transient spikes and dissipates energy in series RC network. Use Value: 50MHz fT and low COBO (6pF) minimize delay and ringing during high-dV/dt events. | Use Scenario: Translating logic-level signals to 100–300V domains in PLC I/O isolation stages. IC Role / Device Role / Timing Role: Level-shifting buffer isolating microcontroller GPIO from high-side gate drivers or sensor interfaces. Use Value: 350V VCEO allows direct connection to HV nodes without external voltage dividers or optocouplers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX653 | BVCEO = 300V (50V lower); hFE min = 100 @ IC=10mA; PD = 1W in SOT89 | Higher power dissipation but lower voltage rating; requires larger footprint | Select when higher current (>500mA) and thermal headroom are prioritized over voltage margin |
| FMMT6520 | Complementary PNP device; same BVCEO = 350V, IC = 500mA, SOT23 package | Used in push-pull or complementary switching topologies, not direct replacement | Choose only for matched pair designs requiring symmetrical high-voltage NPN/PNP operation |
Compared with ZTX653 and FMMT6520, FMMT6517TA uniquely balances 350V rating, SOT23 compactness, and AEC-Q101 compliance-making it optimal for space-constrained, automotive-qualified high-voltage switching where voltage margin and footprint are critical.
Availability
FMMT6517TA is available at Aetrix Electronics and suitable for industrial power supply protection, automotive relay driving, flyback snubber circuits, and high-voltage signal level shifting requiring stable component supply and long-term lifecycle support.
Supply support for FMMT6517TA 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 and manufacturing operations across Asia and the Americas.
FMMT6517TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for robust switching in automotive, industrial, and telecom power systems where reliability under high-voltage stress is essential.
FAQ
What is the maximum safe operating voltage for FMMT6517TA in continuous DC applications?
The FMMT6517TA is rated for VCEO = 350V and VCBO = 350V under DC conditions at TA = 25°C. For continuous operation, derating is required above 25°C ambient per the thermal curve; at 100°C junction temperature, maximum recommended VCEO drops to approximately 280V to ensure long-term reliability and avoid avalanche degradation.
Can FMMT6517TA be used in linear amplifier configurations?
No - FMMT6517TA is optimized for switching operation, not linear amplification. Its hFE variation across IC (20–200) and lack of specified linearity parameters (e.g., distortion, frequency response in common-emitter mode) make it unsuitable for analog gain stages. It should be operated in saturation/cutoff regions for digital or power switching.
Is the SOT23 package of FMMT6517TA compatible with standard reflow profiles?
Yes - the SOT23 package uses matte tin-plated leads compliant with MIL-STD-202 Method 208 and is rated for moisture sensitivity level 1 (J-STD-020), meaning it can be stored indefinitely at ≤30°C/60% RH and processed using standard lead-free reflow profiles (peak 260°C, 20–40 sec above 217°C) without baking.
How does the AEC-Q101 qualification impact FMMT6517TA's use in non-automotive applications?
AEC-Q101 qualification confirms rigorous stress testing (temperature cycling, HTGB, HTRB, ESD), resulting in higher parametric consistency and longer field life. In industrial or telecom applications, this translates to reduced infant mortality, tighter hFE distribution, and improved reliability under thermal shock - even when automotive environmental extremes are not required.
FMMT6517TA 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):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 350 V
- Vce Saturation (Max) @ Ib, Ic:
- 1V @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 20 @ 50mA, 10V
- Power - Max:
- 330 mW
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT6517TA FAQ
1.How can I place an order for FMMT6517TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT6517TA 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 FMMT6517TA reliable?
The price and inventory of FMMT6517TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT6517TA is usually 5 days.
3.What payment methods are accepted for FMMT6517TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT6517TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT6517TA?
FMMT6517TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT6517TA 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 FMMT6517TA?
For technical support, including FMMT6517TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT6517TA requirements.
6.How does Aetrix verify that FMMT6517TA is sourced from the original manufacturer or authorized distributors?
All FMMT6517TA 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 FMMT6517TA meets industry standards.
7.What is the process for return or replacement of FMMT6517TA?
All FMMT6517TA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT6517TA, 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 FMMT6517TA part is unused and in its original packaging.
Return procedure for FMMT6517TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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