Renesas 3SK295ZQ-TL-E

Overview

3SK295ZQ-TL-E from Renesas Electronics is a silicon N-channel dual-gate MOSFET designed for UHF RF amplification. It delivers a typical noise figure of 2.0 dB at 900 MHz, supports low-voltage operation (V_DS = 4 V), and provides 19.5 dB power gain with 20.8 mS forward transfer admittance at 1 kHz under specified bias conditions.

For engineers reviewing the 3SK295ZQ-TL-E datasheet, 3SK295ZQ-TL-E pinout, 3SK295ZQ-TL-E application, or 3SK295ZQ-TL-E equivalent, key selection criteria include its dual-gate architecture for input impedance control, low-noise performance in 800–1000 MHz bands, gate voltage tolerance (±8 V), MPAK-4 surface-mount package, and suitability for compact UHF front-end designs requiring stable small-signal gain.

Technical Context

This device employs a dual-gate structure where Gate1 controls transconductance and input matching, while Gate2 sets DC bias and channel conductivity. Its low Crss (0.01–0.03 pF) minimizes feedback capacitance, enabling stable high-frequency amplification without external neutralization.

Designed for single-ended UHF amplifier stages, it operates with V_DS up to 12 V and ID up to 25 mA, with thermal limits defined by a 150°C channel temperature and 150 mW channel power dissipation at 25°C ambient - derating linearly above 25°C per the published Pch vs. Ta curve.

Key Specifications

Pinout & Package

3SK295ZQ-TL-E uses the MPAK-4 package (RENESAS code PLSP0004ZA-A), a 4-pin surface-mount plastic package with exposed drain pad for thermal enhancement. Pin 1 is Source, Pin 2 is Gate1, Pin 3 is Gate2, and Pin 4 is Drain - confirmed by outline diagram and marking "ZQ–" orientation on datasheet page 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-gate MOSFET amplifier applications.

Compared with NE3210S and BF998, the 3SK295ZQ-TL-E offers the best balance of noise performance (2.0 dB), gain (19.5 dB), and thermal robustness (150°C Tch) in the MPAK-4 form factor - making it optimal for industrial UHF amplifiers requiring reliability across extended temperature ranges.

Availability

3SK295ZQ-TL-E is available at Aetrix Electronics and suitable for UHF wireless microphones, cordless phone base stations, ISM band sensor transceivers, and UHF RFID reader front-ends requiring stable component supply and RoHS-compliant packaging.

Supply support for 3SK295ZQ-TL-E 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 is a global semiconductor leader headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and RF solutions for industrial, automotive, and consumer markets.

The 3SK295ZQ-TL-E belongs to Renesas' legacy RF transistor product line, engineered specifically for high-performance, low-noise UHF amplification in compact wireless infrastructure and portable communication devices.

FAQ

What is the maximum drain current rating for the 3SK295ZQ-TL-E?

The 3SK295ZQ-TL-E has an absolute maximum drain current (I_D) rating of 25 mA at T_a = 25°C. Operation above this value risks thermal runaway or permanent degradation. Derating is required per the channel power dissipation curve - P_ch drops linearly to zero at 150°C channel temperature. For continuous 10 mA operation, ensure PCB copper area and airflow maintain T_ch ≤ 125°C. The 3SK295ZQ-TL-E datasheet specifies pulse test conditions for transient current peaks.

Does the 3SK295ZQ-TL-E require external neutralization for stability?

No, the 3SK295ZQ-TL-E does not require external neutralization due to its inherently low reverse transfer capacitance (C_rss = 0.01–0.03 pF), which minimizes internal feedback. Stability is further enhanced by the dual-gate architecture that isolates RF input (Gate1) from DC bias (Gate2). Measured S-parameters confirm unconditional stability across 100–1000 MHz when properly decoupled and matched - verified in the 3SK295ZQ-TL-E datasheet Figures 5–8.

What is the recommended gate bias configuration for low-noise operation of the 3SK295ZQ-TL-E?

For minimum noise figure, bias Gate2 at +3.0 V and Gate1 at 0.5 V (DC), with V_DS = 4.0 V and I_D = 10 mA - matching the 3SK295ZQ-TL-E's NF = 2.0 dB typ. condition at 900 MHz. Gate1 must be AC-coupled; Gate2 requires low-impedance DC bias with ≥10 µF bypassing to ground. The 3SK295ZQ-TL-E's VG1S(off) range (–0.5 to +0.5 V) and VG2S(off) (0 to +1.0 V) allow precise setting of this operating point using resistive dividers or dedicated bias ICs.

Is the 3SK295ZQ-TL-E RoHS compliant and lead-free?

Yes, the 3SK295ZQ-TL-E is RoHS compliant and lead-free. Renesas confirms compliance with EU Directive 2011/65/EU (RoHS 2) in its environmental documentation, and the "-E" suffix in the part number denotes lead-free plating per JEDEC standard. The MPAK-4 package uses matte tin (Sn) termination with no lead content exceeding 0.1 wt%. Full material declarations and test reports for the 3SK295ZQ-TL-E are available through Renesas' compliance portal upon request.

How does electrostatic discharge sensitivity affect handling of the 3SK295ZQ-TL-E?

As stated in the 3SK295ZQ-TL-E datasheet, this device is highly ESD-sensitive (HBM Class 1A, < 250 V). Handling requires grounded wrist straps, conductive foam storage, ionized air workstations, and ESD-safe taping equipment. PCB assembly must use static-dissipative soldering irons and avoid ungrounded rework tools. Failure to observe these precautions may cause latent damage to Gate1 or Gate2 oxide layers - degrading NF or causing parametric shift. The 3SK295ZQ-TL-E marking "ZQ–" identifies the correct orientation to prevent misalignment-induced stress during pick-and-place.