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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Renesas 2SK1581-T1B-A

Name: 2SK1581-T1B-A
Brand: Renesas
SKU: 2SK1581-T1B-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SK1581-T1B-A

Manufacturer:: Renesas

Category:: FETs, MOSFETs

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: 2SK1581-T1B-A.pdf

Description:: 2SK1581-T1B-A - SWITCHING N-CHAN

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Product details

Overview

2SK1581-T1B-A from Renesas Electronics is an N-channel vertical MOSFET designed for low-voltage switching in portable audio and video equipment. It features 16 V V_DSS, ±200 mA I_D(DC), 5.0 Ω R_DS(on) at V_GS = 2.5 V, 70 mS |y_fs|, and SC-59 package - enabling direct drive from 2.5–3.0 V logic ICs in VCR cameras and headphone stereos.

For engineers reviewing the 2SK1581-T1B-A datasheet, 2SK1581-T1B-A pinout, 2SK1581-T1B-A application, or 2SK1581-T1B-A equivalent, key selection criteria include guaranteed turn-on at 2.5 V, ESD-protected gate structure, low R_DS(on) under sub-3 V bias, and thermal performance within 200 mW P_T at T_A = 25°C.

Technical Context

This device operates as a low-threshold, high-input-impedance switching element with V_GS(off) between 0.8 V and 1.6 V and gate leakage ≤ ±5.0 µA at ±3.0 V. Its vertical MOSFET architecture supports fast switching (t_d(on) = 100 ns, t_f = 240 ns) under 3.0 V supply conditions.

The integrated gate-source protection diode provides basic ESD immunity, but external overvoltage protection is required when transient voltages exceed ±16 V V_GSS. Channel temperature is rated to 150°C, with storage range from −55°C to +150°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	16 V - maximum drain-source blocking voltage before avalanche conduction
I_D(DC)	±200 mA - continuous DC current handling capability at T_A = 25°C
R_DS(on)1	5.0 Ω max at V_GS = 2.5 V, I_D = 1.0 mA - ensures reliable on-state conduction from low-voltage logic
\|y_fs\|	70 mS typ at V_DS = 3.0 V, I_D = 10 mA - indicates strong transconductance for responsive switching
t_d(on)	100 ns - turn-on delay time defines minimum pulse-width compatibility in digital control circuits
P_T	200 mW - total power dissipation limit determines thermal derating in compact PCB layouts
V_GS(off)	1.1 V typ - gate threshold voltage enables activation with standard 2.5–3.3 V logic families

Pinout & Package

2SK1581-T1B-A is housed in the SC-59 (Mini Mold) surface-mount package, measuring 2.9 mm × 1.5 mm × 0.95 mm with gull-wing leads. The marking "G14" appears on the top surface.

Pin/Terminal	Circuit Role	Design Meaning
1 (Source)	Current return path for channel conduction	Internally connected to substrate; serves as reference node for gate control and body diode cathode
2 (Gate)	Control electrode for channel formation	High-impedance input requiring no drive current; protected by integrated gate-source diode
3 (Drain)	Main current output terminal	Connected to load side of switching circuit; handles up to 16 V and ±200 mA DC

Key Features

Feature	Design Value
Low-voltage gate drive	Operates fully enhanced at V_GS ≥ 2.5 V - eliminates need for level-shifting circuitry in 3 V systems
No external bias resistor required	High input impedance (>10⁹ Ω) prevents loading of driving IC outputs
Integrated ESD protection	Gate-source protection diode rated for ±16 V - reduces board-level TVS component count
Fast switching speed	Combined t_d(on) + t_r + t_d(off) + t_f < 900 ns - supports >1 MHz PWM in battery-powered audio amplifiers

Applications

VCR Camera Power Switching	Headphone Stereo Output Stage
Use Scenario: Selectively enabling motor drivers and sensor modules during recording mode to minimize standby current. IC Role / Device Role / Timing Role: Low-side switching FET controlling 5–12 V peripheral rails with microsecond-scale enable/disable timing. Use Value: 2.5 V-compatible turn-on ensures synchronization with 3 V microcontroller GPIO without additional driver stages.	Use Scenario: Muting/unmuting left/right audio channels during plug detection or volume ramping. IC Role / Device Role / Timing Role: Signal-path shunt switch isolating amplifier outputs to prevent pop/click transients. Use Value: 200 mW P_T and 5.0 Ω R_DS(on) limit insertion loss and thermal rise in space-constrained earpiece PCBs.
Portable Media Player Backlight Control	USB-Powered Audio DAC Interface
Use Scenario: PWM dimming of white LED backlight using 3 V MCU timer output. IC Role / Device Role / Timing Role: High-frequency switching element operating at 1–5 kHz with minimal gate charge demand. Use Value: 70 mS \|y_fs\| and 27 pF C_iss support efficient switching with low drive power from CMOS outputs.	Use Scenario: Isolating analog ground domains between USB interface IC and audio codec to reduce noise coupling. IC Role / Device Role / Timing Role: Bidirectional analog switch controlled by USB enumeration status signal. Use Value: Low R_DS(on) and negligible gate current preserve signal integrity in 1 V_PP audio paths.

VCR Camera Power Switching

Headphone Stereo Output Stage

Use Scenario: Selectively enabling motor drivers and sensor modules during recording mode to minimize standby current.

IC Role / Device Role / Timing Role: Low-side switching FET controlling 5–12 V peripheral rails with microsecond-scale enable/disable timing.

Use Value: 2.5 V-compatible turn-on ensures synchronization with 3 V microcontroller GPIO without additional driver stages.

Use Scenario: Muting/unmuting left/right audio channels during plug detection or volume ramping.

IC Role / Device Role / Timing Role: Signal-path shunt switch isolating amplifier outputs to prevent pop/click transients.

Use Value: 200 mW P_T and 5.0 Ω R_DS(on) limit insertion loss and thermal rise in space-constrained earpiece PCBs.

Portable Media Player Backlight Control

USB-Powered Audio DAC Interface

Use Scenario: PWM dimming of white LED backlight using 3 V MCU timer output.

IC Role / Device Role / Timing Role: High-frequency switching element operating at 1–5 kHz with minimal gate charge demand.

Use Value: 70 mS |y_fs| and 27 pF C_iss support efficient switching with low drive power from CMOS outputs.

Use Scenario: Isolating analog ground domains between USB interface IC and audio codec to reduce noise coupling.

IC Role / Device Role / Timing Role: Bidirectional analog switch controlled by USB enumeration status signal.

Use Value: Low R_DS(on) and negligible gate current preserve signal integrity in 1 V_PP audio paths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel low-voltage switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SK3541-TL-E	V_DSS = 20 V, R_DS(on) = 3.0 Ω @ V_GS = 2.5 V, SC-70 package	Higher voltage margin and lower on-resistance, but 0.65 mm pitch requires finer layout	Preferred where 20 V headroom or <3 Ω conduction loss is critical; verify PCB pad compatibility with SC-70 footprint
RSQ020N03TR	V_DSS = 30 V, R_DS(on) = 2.8 Ω @ V_GS = 2.5 V, SOT-23 package	Wider voltage range and tighter R_DS(on) tolerance, but higher C_iss (45 pF)	Suitable for upgraded designs needing extended voltage safety margin; evaluate increased capacitive loading on gate driver

Compared with 2SK1581-T1B-A, the 2SK3541-TL-E offers improved conduction efficiency in same-voltage systems, while RSQ020N03TR extends operational headroom to 30 V - both retain low-threshold gate drive but require layout adaptation due to differing packages and parasitic capacitance profiles.

Availability

2SK1581-T1B-A is available at Aetrix Electronics and suitable for VCR cameras, headphone stereos, portable media players, and USB-powered audio interfaces requiring stable component supply across long-lifecycle consumer electronics programs.

Supply support for 2SK1581-T1B-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 is a global semiconductor manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and discrete devices.

The 2SK1581-T1B-A belongs to Renesas' legacy low-voltage switching MOSFET product line, engineered specifically for power-efficient signal routing and rail switching in battery-operated portable audio/video equipment.

FAQ

What is the guaranteed gate threshold voltage range for 2SK1581-T1B-A?

The 2SK1581-T1B-A has a specified V_GS(off) range of 0.8 V to 1.6 V at V_DS = 3.0 V and I_D = 10 µA, with 1.1 V typical. This ensures consistent turn-on behavior across process variation when driven from 2.5–3.0 V logic sources, making it suitable for direct interfacing with modern low-voltage ICs without external level shifting.

Can 2SK1581-T1B-A be used in place of a bipolar transistor in existing 3 V logic-switched circuits?

Yes - the 2SK1581-T1B-A replaces small-signal BJTs in low-power switching roles due to its high input impedance, eliminating base-current calculation and bias resistors. Its 200 mA I_D(DC) rating and 5.0 Ω R_DS(on) at 2.5 V provide comparable or better conduction efficiency than many general-purpose NPN transistors in the same footprint, with reduced drive complexity.

Does 2SK1581-T1B-A include built-in ESD protection, and is external protection still needed?

Yes, the 2SK1581-T1B-A integrates a gate-source protection diode per the datasheet, rated for ±16 V. However, Renesas explicitly states that external overvoltage protection remains mandatory if system-level transients may exceed absolute maximum ratings - especially in handheld devices subject to human-body-model ESD events beyond the internal diode's clamping capacity.

What is the thermal resistance (R_θJA) of 2SK1581-T1B-A in its SC-59 package?

The datasheet does not specify R_θJA directly for 2SK1581-T1B-A. However, based on SC-59 thermal performance benchmarks and its 200 mW P_T rating at T_A = 25°C, typical R_θJA falls between 600–650°C/W. For reliable operation above ambient, designers must limit power dissipation using derating curves and ensure adequate copper area around the source pad to improve heat spreading.

Is 2SK1581-T1B-A compliant with RoHS and lead-free assembly requirements?

Yes - Renesas Electronics confirms RoHS compliance for the 2SK1581-T1B-A per EU Directive 2011/65/EU. The device uses lead-free terminations and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 1, supporting standard reflow profiles including Pb-free soldering at peak temperatures up to 260°C.

2SK1581-T1B-A Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Bulk

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 16 V

Current - Continuous Drain (Id) @ 25°C:: 200mA (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 2.5V, 4V

Rds On (Max) @ Id, Vgs:: 5Ohm @ 1mA, 4V

Vgs(th) (Max) @ Id:: 1.6V @ 10µA

Gate Charge (Qg) (Max) @ Vgs:: -

Vgs (Max):: ±16V

Input Capacitance (Ciss) (Max) @ Vds:: 27 pF @ 3 V

FET Feature:: -

Power Dissipation (Max):: 200mW (Ta)

Operating Temperature:: 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-59

2SK1581-T1B-A FAQ

1.How can I place an order for 2SK1581-T1B-A through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SK1581-T1B-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 2SK1581-T1B-A reliable?

The price and inventory of 2SK1581-T1B-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SK1581-T1B-A is usually 5 days.

3.What payment methods are accepted for 2SK1581-T1B-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SK1581-T1B-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SK1581-T1B-A?

2SK1581-T1B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SK1581-T1B-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 2SK1581-T1B-A?

For technical support, including 2SK1581-T1B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SK1581-T1B-A requirements.

6.How does Aetrix verify that 2SK1581-T1B-A is sourced from the original manufacturer or authorized distributors?

All 2SK1581-T1B-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 2SK1581-T1B-A meets industry standards.

7.What is the process for return or replacement of 2SK1581-T1B-A?

All 2SK1581-T1B-A units undergo pre-shipment inspection (PSI). If there is an issue with 2SK1581-T1B-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 2SK1581-T1B-A part is unused and in its original packaging.

Return procedure for 2SK1581-T1B-A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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