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Diodes Incorporated FMMT6520TA
- Part No.:
- FMMT6520TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT6520TA.pdf
- Description:
- TRANS PNP 350V 0.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:67,120
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Product details
Overview
FMMT6520TA from Diodes Incorporated is a 350V PNP silicon planar high-voltage transistor in SOT-23 package, rated for -500mA continuous collector current and -350V collector-emitter breakdown voltage, with 330mW power dissipation; used in high-voltage power switching applications such as flyback converters and relay drivers.
For engineers reviewing the FMMT6520TA datasheet, FMMT6520TA pinout, FMMT6520TA application, or FMMT6520TA equivalent, key selection criteria include VCEO = -350V, IC = -500mA, hFE = 20–200 (at IC = -1mA to -100mA), VCE(sat) ≤ -1000mV at IC = -50mA, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This PNP bipolar junction transistor operates in linear or saturated switching mode, with guaranteed BVCEO ≥ -350V and low leakage (ICBO ≤ -50nA at VCB = -250V). Its fT = 50MHz enables moderate-speed switching in high-voltage DC-DC stages.
Thermal design is constrained by RθJA = 379°C/W on FR4 PCB with minimum pad layout; RθJL = 350°C/W supports lead-solder-point thermal relief. The device is qualified to AEC-Q101, confirming suitability for automotive power control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -350V - supports high-side switching in 200–300V DC bus applications without avalanche stress |
| IC (cont.) | -500mA - enables driving medium-power loads like solenoids or small relays directly |
| PD | 330mW - limits continuous operation to <150mA at VCE ≈ -2V in ambient air without heatsinking |
| hFE | 20–200 - wide gain range allows flexible base drive design across load currents from 1mA to 100mA |
| VCE(sat) | -300 to -1000mV - ensures low conduction loss when saturated with IB/IC = 0.1 |
| fT | 50MHz - supports switching frequencies up to ~5MHz with acceptable gain roll-off in amplifier configurations |
| Package | SOT-23 - surface-mount footprint compatible with automated assembly and space-constrained PCB layouts |
Pinout & Package
Package: SOT-23, plastic molded case, matte tin-plated terminals, moisture sensitivity level 1 per J-STD-020, weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Reference node for PNP current flow; connects to higher potential rail in high-side switch configuration |
| 2 (Base) | Control input | Receives negative base current to turn on; requires current-limiting resistor referenced to emitter |
| 3 (Collector) | Output terminal | Carries load current to ground or lower-potential node; must withstand -350V reverse bias when off |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power control systems requiring extended temperature (-55°C to +150°C) and reliability screening |
| VCEO ≥ -350V | Enables direct use in 230VAC rectified bus (≈325V peak) with margin for transients |
| Lead-free & halogen-free | Complies with RoHS and Diodes Inc.'s "Green" policy; suitable for environmentally regulated industrial and automotive production |
| Low ICBO (≤ -50nA) | Minimizes standby power loss in always-on high-voltage hold circuits |
Applications
| High-Voltage Flyback Switch | Automotive Relay Driver |
|---|---|
Use Scenario: Primary-side switching in isolated 12–24V input flyback converters delivering 5–24V outputs at ≤10W. IC Role / Device Role / Timing Role: High-voltage PNP switch controlling energy transfer into transformer primary winding during ON phase. Use Value: -350V VCEO provides 30% margin over 24V-input flyback reflected voltage spikes; SOT-23 enables compact transformer-isolated PSU layout. | Use Scenario: Driving 12V automotive relays (e.g., HVAC, lighting, fuel pump) from microcontroller GPIO pins. IC Role / Device Role / Timing Role: Medium-current PNP interface buffer amplifying logic-level signals to deliver ≥100mA coil current. Use Value: hFE ≥ 20 at IC = -100mA ensures reliable saturation with 5–10mA base drive; AEC-Q101 rating guarantees operation across vehicle temperature extremes. |
| Industrial HV Bias Supply | LED String Current Regulator |
Use Scenario: Generating stable -100 to -300V bias rails for op-amp supplies or sensor front-ends in test equipment. IC Role / Device Role / Timing Role: Linear pass element in series-regulated negative HV supply, dissipating up to 330mW. Use Value: Low ICBO and tight VBE(on) tolerance (-2.0V max) ensure predictable regulation accuracy and minimal quiescent drift. | Use Scenario: Constant-current sink for 3–5 white LED strings in signage or backlighting, operating from 24–48V DC bus. IC Role / Device Role / Timing Role: High-voltage PNP current mirror reference or active sink in analog dimming circuits. Use Value: VCEO = -350V accommodates full-string forward voltage (up to 150V) plus ripple; fT = 50MHz supports PWM dimming up to 10kHz without phase lag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX653 | VCEO = -300V, IC = -1A, SOT-89 package | Higher current but lower voltage rating; larger thermal mass | Select when >500mA load current required and board space permits SOT-89 |
| FMMT6517 | Complementary NPN part (VCEO = +350V, IC = +500mA), same SOT-23 footprint | Used in push-pull or level-shifting topologies requiring matched pair | Choose for dual-transistor designs where complementary symmetry is needed |
Compared with ZTX653 and FMMT6517, FMMT6520TA uniquely balances -350V rating, SOT-23 compactness, and AEC-Q101 compliance-making it optimal for space-constrained, high-reliability automotive and industrial HV switching where strict voltage margin and qualification matter most.
Availability
FMMT6520TA is available at Aetrix Electronics and suitable for high-voltage power switches, automotive relay drivers, and industrial bias supplies requiring stable component supply and long-term manufacturability.
Supply support for FMMT6520TA 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.
FMMT6520TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for robust, AEC-Q101-compliant switching in automotive power management and industrial HV control systems.
FAQ
What is the maximum safe operating voltage for FMMT6520TA in continuous DC applications?
The absolute maximum collector-emitter voltage is -350V (VCEO). For reliable long-term operation, design should maintain ≤80% of this rating (i.e., ≤-280V) under worst-case conditions including transients and temperature derating, especially in automotive environments where load-dump spikes may occur.
Can FMMT6520TA be used in linear regulator configurations?
Yes-it supports linear operation with VCE > VCE(sat), but power dissipation must stay within 330mW at 25°C ambient. Derating is required above 25°C (379°C/W RθJA); for example, at 85°C ambient, max allowable PD drops to ~180mW, limiting usable IC·VCE product accordingly.
Is FMMT6520TA pin-compatible with standard SOT-23 PNP transistors like MMBT3906?
No-FMMT6520TA uses E-B-C pinout (Emitter=Pin1, Base=Pin2, Collector=Pin3), whereas MMBT3906 uses E-C-B. Swapping them without board revision will cause functional failure or damage due to reversed collector/emitter connections.
Does FMMT6520TA require external protection diodes in inductive switching applications?
Yes-when switching inductive loads (e.g., relays, solenoids), a reverse-biased flyback diode (e.g., 1N4007) must be placed across the load to clamp VCE spikes exceeding -350V. The transistor's lack of built-in avalanche capability means unclamped inductive kick can cause immediate breakdown.
FMMT6520TA 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):
- 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
FMMT6520TA FAQ
1.How can I place an order for FMMT6520TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT6520TA 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 FMMT6520TA reliable?
The price and inventory of FMMT6520TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT6520TA is usually 5 days.
3.What payment methods are accepted for FMMT6520TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT6520TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT6520TA?
FMMT6520TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT6520TA 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 FMMT6520TA?
For technical support, including FMMT6520TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT6520TA requirements.
6.How does Aetrix verify that FMMT6520TA is sourced from the original manufacturer or authorized distributors?
All FMMT6520TA 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 FMMT6520TA meets industry standards.
7.What is the process for return or replacement of FMMT6520TA?
All FMMT6520TA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT6520TA, 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 FMMT6520TA part is unused and in its original packaging.
Return procedure for FMMT6520TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT6520TA Tags
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