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Renesas 3SK255-T2-A
- Part No.:
- 3SK255-T2-A
- Manufacturer:
- Renesas
- Category:
- Single FETs, MOSFETs
- Package:
- -
- Datasheet:
-
3SK255-T2-A.pdf
- Description:
- RF MOSFET
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
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Product details
Overview
3SK255-T2-A from NEC (now Renesas Electronics) is an N-channel dual-gate silicon MOSFET designed for RF amplification in UHF TV tuners. It operates at low VDS = 3.5 V, delivers 18.0 dB typical power gain and 1.8 dB typical noise figure at 900 MHz, and uses a 4-pin Super Mini Mold package.
For engineers reviewing the 3SK255-T2-A datasheet, 3SK255-T2-A pinout, 3SK255-T2-A application, or 3SK255-T2-A equivalent, key selection criteria include dual-gate noise performance, UHF small-signal gain stability, gate cutoff voltage matching (VG1S(off) = ±1.0 V, VG2S(off) = 0–1.0 V), and 130 mW power dissipation capability in compact surface-mount form.
Technical Context
This dual-gate MOSFET employs independent gate control to suppress feedback and improve isolation-Gate1 modulates channel conductance while Gate2 sets DC bias and input impedance. Its low 1.7 pF typical input capacitance (Ciss) and 0.03 pF reverse transfer capacitance (Crss) enable stable high-frequency operation up to 1 GHz with minimal Miller effect.
The device is characterized at VDS = 3.5 V, ID = 7 mA, and VG2S = 3 V, delivering verified S-parameters (e.g., |S21| = 1.897 ∠105.6° at 900 MHz) and consistent noise performance across its specified operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSX | 18 V - Maximum drain-source blocking voltage defines safe RF swing headroom in tuner front-end stages |
| NF (900 MHz) | 1.8 dB typ. - Enables high-sensitivity UHF signal reception with minimal added noise in broadcast tuner LNA stages |
| Gps (900 MHz) | 18.0 dB typ. - Provides sufficient small-signal gain to drive subsequent mixer stages without external amplification |
| |yfs| | 14–24 mS - Forward transconductance supports stable gain control via Gate2 voltage tuning |
| Ciss | 1.7 pF typ. - Low input capacitance minimizes loading on preceding filter networks in 470–862 MHz TV bands |
| PD | 130 mW - Thermal design allows continuous operation in sealed tuner modules without forced cooling |
| VG1S(off) | –1.0 to +1.0 V - Tight cutoff voltage tolerance enables predictable DC bias point setting across production lots |
Pinout & Package
Package: 4-pin Super Mini Mold (SOT-343-compatible footprint, 2.1 × 1.25 mm body, 0.9 mm height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Source | Common reference node for both gates and drain; tied to ground plane in RF layout for minimal inductance |
| 2 | Drain | RF output node; requires controlled-impedance trace and DC blocking before next stage |
| 3 | Gate2 | Bias control terminal; sets quiescent current and input impedance; decoupled via 47 kΩ + 1000 pF network |
| 4 | Gate1 | RF input terminal; high-impedance gate accepts tuned antenna signal with minimal loading |
Key Features
| Feature | Design Value |
|---|---|
| Dual-gate architecture | Enables independent RF signal injection (Gate1) and DC bias stabilization (Gate2), reducing interstage coupling in multi-stage tuners |
| Low-noise UHF operation | 1.8 dB NF at 900 MHz meets stringent sensitivity requirements for analog/digital terrestrial TV reception |
| Embossed taping | Supports automated pick-and-place assembly in high-volume tuner module manufacturing |
| Small-outline surface mount | 2.1 × 1.25 mm footprint saves PCB area in space-constrained set-top box and TV mainboard designs |
| Specified S-parameters | Full 100–1000 MHz S-parameter table enables accurate RF simulation and matching network synthesis |
Applications
| UHF TV Tuner Front-End | Terrestrial Digital Broadcast Receiver |
|---|---|
Use Scenario: Amplifying weak over-the-air UHF signals (470–862 MHz) prior to mixing in analog or digital TV receivers. IC Role / Device Role / Timing Role: Low-noise RF amplifier (LNA) with dual-gate isolation to prevent oscillator pulling and ensure image rejection. Use Value: 1.8 dB NF and 18 dB gain maintain carrier-to-noise ratio above DVB-T minimum threshold under marginal signal conditions. | Use Scenario: Signal conditioning in portable DVB-T USB dongles and integrated TV SoC reference designs. IC Role / Device Role / Timing Role: First-stage broadband RF amplifier optimized for 900 MHz band with stable gain flatness ±1.5 dB. Use Value: 1.7 pF Ciss and 0.03 pF Crss minimize detuning of external ceramic filters and reduce layout sensitivity. |
| FM Radio Band Extension | ISM Band Sensor Transceiver |
Use Scenario: Extending FM radio reception (87.5–108 MHz) in automotive infotainment systems using shared antenna paths. IC Role / Device Role / Timing Role: Low-voltage RF preamplifier compatible with 3.3 V supply rails and automotive temperature range. Use Value: VDS = 3.5 V operation and 125 °C channel rating support reliable function in under-dash thermal environments. | Use Scenario: Transmit/receive switching path in 915 MHz ISM-band wireless sensor nodes (e.g., smart metering). IC Role / Device Role / Timing Role: Bidirectional RF amplifier supporting half-duplex FSK/ASK modulation schemes. Use Value: Dual-gate structure allows dynamic gain control via Gate2 during TX/RX state transitions without external switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE55172 | Higher NF (2.5 dB typ. @ 900 MHz); lower Gps (15 dB typ.); same 4-pin SOT-343 package | Less suitable for weak-signal terrestrial TV; better for cost-sensitive FM receiver designs | Select when lower unit cost outweighs 0.7 dB NF penalty and system SNR margin is >6 dB |
| 2SK2975 | Higher PD (200 mW); wider VDSX (25 V); different pinout (G1/G2 swapped) | Requires PCB layout revision; preferred in industrial-grade tuners needing extended voltage headroom | Choose only if redesigning for higher reliability under voltage transients or elevated ambient temperatures |
Compared with 3SK255-T2-A, NE55172 trades noise performance for cost, while 2SK2975 offers higher power handling but demands board rework-neither is pin-compatible, making 3SK255-T2-A optimal for legacy UHF tuner upgrades requiring drop-in replacement.
Availability
3SK255-T2-A is available at Aetrix Electronics and suitable for UHF TV tuner front-ends, terrestrial digital broadcast receivers, and ISM-band sensor transceivers requiring stable component supply and long-term obsolescence management.
Supply support for 3SK255-T2-A 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
Renesas Electronics Corporation (formerly NEC Electronics) is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and RF components for consumer, industrial, and automotive markets.
The 3SK255-T2-A belongs to NEC's legacy RF transistor product line, engineered specifically for high-selectivity, low-noise amplification in analog and early digital television tuner modules.
FAQ
What is the maximum operating frequency of the 3SK255-T2-A?
The 3SK255-T2-A is fully characterized up to 1000 MHz with verified S-parameters and maintains usable gain and noise performance through the UHF band (470–862 MHz). At 900 MHz, it delivers 18.0 dB typical power gain and 1.8 dB typical noise figure-its design target frequency per datasheet test circuit and application note.
Is the 3SK255-T2-A RoHS compliant?
The 3SK255-T2-A was manufactured prior to RoHS Directive enforcement and does not carry RoHS certification. It contains lead in solder and packaging materials per 1996 specification. For new designs, Renesas recommends evaluating modern alternatives such as the RQ5E025AT or equivalent RF transistors with full RoHS compliance.
Can the 3SK255-T2-A be used with a 5 V supply?
No-the 3SK255-T2-A is rated for VDS ≤ 3.5 V in normal RF amplifier operation per datasheet test conditions. Exceeding this risks exceeding absolute maximum ratings (VDSX = 18 V is a breakdown limit, not an operating condition), accelerating degradation and increasing noise figure beyond 3.0 dB.
What is the meaning of "U1G" marking on the 3SK255-T2-A package?
The "U1G" marking on the 3SK255-T2-A indicates its IDSX classification rank, corresponding to a drain current range of 0.5–7.0 mA under standard test conditions (VDS = 3.5 V, VG2S = 3 V, VG1S = 0.75 V). This binning ensures consistent gain and noise performance across production units.
Does the 3SK255-T2-A require external biasing components?
Yes-the 3SK255-T2-A requires external biasing: Gate2 is biased via a 47 kΩ resistor and 1000 pF capacitor (per GPS/NF test circuit), while Gate1 uses DC blocking and RF matching. The device lacks internal bias circuitry and relies on external passive networks to establish stable ID and optimal noise performance.
3SK255-T2-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- -
- Configuration:
- -
- Frequency:
- -
- Gain:
- -
- Voltage - Test:
- -
- Current Rating (Amps):
- -
- Noise Figure:
- -
- Current - Test:
- -
- Power - Output:
- -
- Voltage - Rated:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
3SK255-T2-A FAQ
1.How can I place an order for 3SK255-T2-A through Aetrix?
Please submit a Request for Quotation (RFQ) for 3SK255-T2-A 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 3SK255-T2-A reliable?
The price and inventory of 3SK255-T2-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3SK255-T2-A is usually 5 days.
3.What payment methods are accepted for 3SK255-T2-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3SK255-T2-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3SK255-T2-A?
3SK255-T2-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3SK255-T2-A 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 3SK255-T2-A?
For technical support, including 3SK255-T2-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3SK255-T2-A requirements.
6.How does Aetrix verify that 3SK255-T2-A is sourced from the original manufacturer or authorized distributors?
All 3SK255-T2-A 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 3SK255-T2-A meets industry standards.
7.What is the process for return or replacement of 3SK255-T2-A?
All 3SK255-T2-A units undergo pre-shipment inspection (PSI). If there is an issue with 3SK255-T2-A, 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 3SK255-T2-A part is unused and in its original packaging.
Return procedure for 3SK255-T2-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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