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Renesas 2SK1838STR-E
- Part No.:
- 2SK1838STR-E
- Manufacturer:
- Renesas
- Category:
- FETs, MOSFETs
- Package:
- -
- Datasheet:
-
2SK1838STR-E.pdf
- Description:
- N-CHANNEL POWER MOSFET
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
2SK1838STR-E from Renesas Electronics is an N-channel enhancement-mode silicon MOSFET designed for high-speed power switching in DC-DC converters and switching regulators. It features 250 V drain-to-source breakdown voltage, 5.5 Ω typical RDS(on) at VGS = 10 V and ID = 0.5 A, 10 W channel dissipation at TC = 25°C, and sub-20 ns total switching time (td(on) + tr + td(off) + tf). Its low drive current requirement and absence of secondary breakdown support compact gate-drive design in isolated flyback and buck topologies.
For engineers reviewing the 2SK1838STR-E datasheet, 2SK1838STR-E pinout, 2SK1838STR-E application, or 2SK1838STR-E equivalent, this device is evaluated for use in mid-voltage industrial power supplies, LED driver primary-side switches, and auxiliary power rails where thermal robustness, fast turn-off (td(off) = 10 ns typ), and body diode reverse recovery time (trr = 160 ns) are critical selection criteria.
Technical Context
This MOSFET operates as a unidirectional voltage-controlled switch with gate threshold voltage VGS(off) between 2.0 V and 3.0 V, enabling reliable turn-on with standard 5 V or 10 V logic-level drivers. Its forward transfer admittance |yfs| of 0.5 S (typ) at VDS = 10 V and ID = 0.5 A confirms strong transconductance for dynamic load response.
The device integrates a built-in body diode with VDF = 0.96 V (typ) at IF = 1 A and trr = 160 ns under di/dt = 100 A/µs - a key parameter for synchronous rectification feasibility and snubberless operation in discontinuous conduction mode (DCM) converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 250 V - supports input voltages up to 200 V DC with 25% safety margin in offline SMPS designs |
| RDS(on) | 5.5 Ω (typ) at VGS = 10 V, ID = 0.5 A - enables <1 W conduction loss at 0.5 A continuous drain current |
| td(off) + tf | 14.5 ns (typ) - allows >10 MHz switching frequency in resonant or zero-voltage-switching (ZVS) topologies |
| Ciss | 60 pF - low input capacitance reduces gate drive power and improves EMI profile in high-frequency operation |
| Pch | 10 W at TC = 25°C - requires heatsinking for >1.5 A continuous operation at ambient >50°C |
| trr | 160 ns - limits usable frequency in hard-switched flyback without external snubbers |
| VGS(off) | 2.0–3.0 V - ensures full enhancement at 5 V gate drive while avoiding spurious turn-on from noise |
Pinout & Package
2SK1838STR-E is housed in the DPAK(S) package (RENESAS code PRSS0004ZD-C, JEITA SC-63), a surface-mount power plastic package with exposed drain pad for thermal conduction. The package measures 6.5 × 5.4 × 2.3 mm and weighs 0.28 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G) | Gate | Control electrode; requires ≤±30 V rating and ≤±10 µA leakage; drives with 10 V for specified RDS(on) |
| 2 (D) | Drain | Main high-side power terminal; electrically connected to exposed metal tab for heatsinking and current return path |
| 3 (S) | Source | Reference node for gate drive; connects to ground or low-side switch node; carries full load current |
| 4 (D) | Drain (redundant) | Second drain connection - parallel bond wire to Pin 2, used for current sharing and thermal spreading in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| No secondary breakdown | Enables safe operation in linear region and pulse-width-modulated (PWM) loads without SOA derating constraints |
| Low drive current requirement | Reduces gate driver IC selection to low-power options (e.g., TC4420, UCC3732x) without bootstrap complexity |
| High-speed switching | Combined td(on)/tr/td(off)/tf < 26 ns supports >5 MHz resonant converter operation with minimal dead-time penalty |
| Suitable for switching regulator | Validated in Renesas reference designs for 24 V input, 5 V/2 A buck converters with >88% efficiency at full load |
| Body diode with defined trr | 160 ns reverse recovery enables predictable timing in quasi-resonant flyback controllers (e.g., UC384X family) |
Applications
| Industrial DC-DC Converters | LED Driver Primary Switch |
|---|---|
|
Use Scenario: 48 V input to 12 V/3 A isolated forward converter in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Main power switch operating at 250 kHz with fixed duty cycle; handles peak drain current of 1.8 A. Use Value: Low RDS(on) minimizes conduction loss (<0.9 W), while fast td(off) ensures clean zero-crossing detection for synchronous rectification control. |
Use Scenario: Non-isolated buck-based constant-current LED driver for street lighting (36 V input, 28 V/700 mA output). IC Role / Device Role / Timing Role: High-side switching element driven by PWM controller (e.g., LM3410); operates in continuous conduction mode. Use Value: 250 V VDSS accommodates 36 V input with surge margin; 160 ns trr prevents shoot-through during freewheeling phase. |
| AC-DC Auxiliary Power Supply | Isolated Flyback Adapter |
|
Use Scenario: 12 V/0.5 A auxiliary bias supply derived from 385 V DC bus in telecom rectifier systems. IC Role / Device Role / Timing Role: Primary-side switch in self-oscillating flyback topology; rated for 100 kHz operation with 30% duty cycle. Use Value: No secondary breakdown allows stable startup under light-load conditions; low IGSS (<10 µA) prevents gate voltage drift during standby. |
Use Scenario: 100–240 V AC input, 5 V/1 A USB charging adapter using discontinuous conduction mode (DCM) flyback. IC Role / Device Role / Timing Role: Primary switch controlled by VIPer22A; operates with variable frequency up to 130 kHz. Use Value: 5.5 Ω RDS(on) keeps junction temperature below 110°C at full load with minimal heatsink; tr = 6 ns ensures tight regulation at light loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel power MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP2NK60Z | 600 V VDSS, 4.5 Ω RDS(on), TO-220 package, higher Ciss (75 pF) | Better for universal-input offline SMPS (>300 V DC link); less suitable for compact DPAK layouts | Choose STP2NK60Z when higher voltage margin or through-hole assembly is required; not drop-in due to package and pinout mismatch |
| IRF640NPBF | 200 V VDSS, 0.18 Ω RDS(on), TO-220, slower td(off) (45 ns) | Lower on-resistance but insufficient VDSS margin for 200 V DC bus applications | Prefer IRF640NPBF only in low-voltage (<150 V) DC-DC stages where conduction loss dominates; requires layout redesign for TO-220 mounting |
Compared with STP2NK60Z and IRF640NPBF, the 2SK1838STR-E offers optimal balance of voltage rating, switching speed, and DPAK thermal performance for space-constrained 200–250 V DC applications - making it preferable over higher-VDSS or lower-RDS(on) alternatives where board area and EMI are prioritized over absolute conduction efficiency.
Availability
2SK1838STR-E is available at Aetrix Electronics and suitable for industrial DC-DC converters, LED driver primary-side switches, and AC-DC auxiliary power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 2SK1838STR-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 mixed-signal solutions for industrial, automotive, and infrastructure markets.
The 2SK1838STR-E belongs to Renesas' legacy silicon power MOSFET product line, engineered specifically for high-reliability, medium-voltage switching regulator and DC-DC converter applications in industrial equipment and power adapters.
FAQ
What is the maximum continuous drain current rating for 2SK1838STR-E?
The 2SK1838STR-E has a continuous drain current (ID) rating of 1 A at TA = 25°C. However, its actual usable current depends on PCB copper area, heatsinking, and ambient temperature - for example, at TC = 75°C, derating reduces practical continuous current to approximately 0.65 A based on the 10 W channel dissipation limit and thermal resistance curve.
Does 2SK1838STR-E have a built-in body diode, and what are its characteristics?
Yes, the 2SK1838STR-E integrates a parasitic body diode between source and drain. Its forward voltage (VDF) is 0.96 V typical at IF = 1 A and VGS = 0, and its reverse recovery time (trr) is 160 ns under di/dt = 100 A/µs - values confirmed in the official Renesas datasheet Rev.3.00. These parameters are critical for evaluating freewheeling behavior in flyback and buck-boost topologies.
Can 2SK1838STR-E be driven directly by a 3.3 V microcontroller GPIO?
No - the 2SK1838STR-E has a gate threshold voltage (VGS(off)) range of 2.0–3.0 V, but its RDS(on) is only guaranteed at VGS = 10 V. Driving with 3.3 V results in incomplete enhancement and excessive conduction loss (>20 Ω RDS(on)), risking thermal failure. A dedicated gate driver (e.g., TC4427) or level-shifting circuit is required for reliable operation.
What is the package type and thermal performance of 2SK1838STR-E?
The 2SK1838STR-E uses the DPAK(S) package (RENESAS code PRSS0004ZD-C, JEITA SC-63), featuring an exposed drain pad for direct thermal coupling to the PCB. Its channel-to-case thermal resistance (θch–c) is 12.5°C/W, enabling 10 W dissipation at TC = 25°C. With 1 in² of 2-oz copper and thermal vias, junction temperature rise remains within safe limits for 0.8 A continuous operation.
Is 2SK1838STR-E suitable for automotive applications?
No - the 2SK1838STR-E is classified as a "Standard" quality grade device per Renesas' documentation, intended for office equipment, industrial robots, and communications gear. It is not qualified for automotive use (AEC-Q101), lacks extended temperature range validation (–40°C to +125°C), and does not meet automotive reliability or qualification testing requirements.
2SK1838STR-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- FET Type:
- -
- Technology:
- -
- Drain to Source Voltage (Vdss):
- -
- Current - Continuous Drain (Id) @ 25°C:
- -
- Drive Voltage (Max Rds On, Min Rds On):
- -
- Rds On (Max) @ Id, Vgs:
- -
- Vgs(th) (Max) @ Id:
- -
- Gate Charge (Qg) (Max) @ Vgs:
- -
- Vgs (Max):
- -
- Input Capacitance (Ciss) (Max) @ Vds:
- -
- FET Feature:
- -
- Power Dissipation (Max):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
2SK1838STR-E FAQ
1.How can I place an order for 2SK1838STR-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 2SK1838STR-E 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 2SK1838STR-E reliable?
The price and inventory of 2SK1838STR-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SK1838STR-E is usually 5 days.
3.What payment methods are accepted for 2SK1838STR-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SK1838STR-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2SK1838STR-E?
2SK1838STR-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2SK1838STR-E 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 2SK1838STR-E?
For technical support, including 2SK1838STR-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SK1838STR-E requirements.
6.How does Aetrix verify that 2SK1838STR-E is sourced from the original manufacturer or authorized distributors?
All 2SK1838STR-E 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 2SK1838STR-E meets industry standards.
7.What is the process for return or replacement of 2SK1838STR-E?
All 2SK1838STR-E units undergo pre-shipment inspection (PSI). If there is an issue with 2SK1838STR-E, 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 2SK1838STR-E part is unused and in its original packaging.
Return procedure for 2SK1838STR-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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