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Taiwan Semiconductor Corporation 1SS355 R9G
- Part No.:
- 1SS355 R9G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
1SS355 R9G.pdf
- Description:
- SOD-323F, 90V, 0.25A, SWITCHING
- Quantity:
- Payment:
- Shipping:
Inventory:8,880
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Product details
Overview
1SS355 R9G from Taiwan Semiconductor is a high-speed SMD switching diode in SOD-323F package, rated for 250 mA forward current, 90 V repetitive peak reverse voltage, and 4 ns reverse recovery time - used in compact DC/DC converters and SMPS secondary-side snubbing circuits.
For engineers reviewing the 1SS355 R9G datasheet, 1SS355 R9G pinout, 1SS355 R9G application, or 1SS355 R9G equivalent, key selection criteria include trr < 4 ns, VF ≤ 1.2 V at 100 mA, IR ≤ 100 nA at 80 V, CJ ≤ 4 pF at 1 MHz, and SOD-323F thermal and layout compatibility.
Technical Context
This discrete silicon switching diode employs a planar epitaxial structure optimized for fast turn-off, with junction capacitance under 4 pF and reverse recovery time measured at IF = 10 mA, RL = 100 Ω, VR = 6 V. Its SOD-323F package supports high-density PCB layouts while maintaining 200 mW power dissipation capability.
The device operates across –65 °C to +150 °C junction temperature range and meets JESD201 Class 1A whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - enabling reflow-compatible assembly without baking preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (max) | 250 mA - supports continuous operation in low-power DC/DC converter output rectification |
| VRRM | 90 V - suitable for 48 V bus-derived auxiliary rails and adapter flyback clamp circuits |
| trr | ≤ 4 ns - enables >10 MHz switching frequency in resonant and quasi-resonant topologies |
| VF @ 100 mA | ≤ 1.2 V - limits conduction loss to <120 mW per diode in high-efficiency SMPS designs |
| CJ @ 0.5 V | ≤ 4 pF - minimizes capacitive loading on gate-drive nodes and high-frequency signal paths |
| IR @ 80 V | ≤ 100 nA - ensures negligible leakage in battery-backed hold-up and standby power circuits |
| PD | 200 mW - defines maximum steady-state power handling in SOD-323F footprint without derating |
Pinout & Package
Package: SOD-323F - ultra-small surface-mount plastic case (2.50 × 1.25 × 0.70 mm), cathode indicated by band, matte tin-plated terminals over nickel underplate, UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in buck sync rectifier or transformer secondary) |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; ties to higher-potential rail (e.g., output capacitor positive or VCC supply) |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | trr ≤ 4 ns enables use in >10 MHz soft-switching converters without excessive switching loss |
| SOD-323F footprint | 0.70 mm height and 2.50 mm length allow placement in space-constrained USB-C PD adapters and LED drivers |
| Halogen-free green compound | "G" suffix confirms compliance with IEC 61249-2-21 - required for RoHS-compliant industrial and consumer end-equipment |
| Junction temperature range | –65 °C to +150 °C supports operation in automotive under-hood ambient and sealed lighting enclosures |
| Moisture sensitivity level | MSL Level 1 - permits standard reflow without dry-pack or baking, reducing manufacturing overhead |
Applications
| SMPS Secondary Rectification | USB-C Power Delivery Adapter |
|---|---|
Use Scenario: High-frequency flyback or active clamp forward converter output stage operating at 300–600 kHz. IC Role / Device Role / Timing Role: Fast-recovery freewheeling diode providing unidirectional current path during MOSFET off-time. Use Value: 4 ns trr reduces reverse recovery charge Qrr to <15 pC, minimizing voltage spikes and EMI generation. | Use Scenario: Compact 65 W GaN-based USB-C PD adapter with multi-output DC/DC regulation. IC Role / Device Role / Timing Role: Snubber diode clamping transient voltages across primary-side switches and synchronous rectifiers. Use Value: 90 V VRRM and 1.2 V VF ensure reliable clamping margin and low conduction loss in 24 V auxiliary rails. |
| LED Driver Flyback Clamp | On-Board DC/DC Converter |
Use Scenario: Isolated LED driver for commercial downlights using 48 V input and constant-current output. IC Role / Device Role / Timing Role: Clamp diode absorbing leakage inductance energy during primary switch turn-off. Use Value: 500 mA IFSM withstands surge currents from transformer leakage spikes without degradation. | Use Scenario: Point-of-load regulator on industrial PLC CPU board converting 12 V to 3.3 V for FPGA I/O banks. IC Role / Device Role / Timing Role: Output rectifier in non-isolated buck-derived topology with integrated controller. Use Value: SOD-323F thermal resistance (RθJA ≈ 400 °C/W) allows 250 mA operation at 65 °C ambient without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ROHM RB520S-40T2R | VRRM = 40 V, trr = 3 ns, VF = 0.33 V @ 100 mA | Limited to ≤24 V systems; lower VF improves efficiency but insufficient for 48 V+ SMPS clamp | Select when lower forward drop is critical and reverse voltage ≤40 V |
| ON Semiconductor NSVR0230HT1G | VRRM = 30 V, trr = 4 ns, VF = 0.45 V @ 100 mA, SOD-323 package | Not rated for 80–90 V reverse stress; unsuitable for flyback clamp in 48 V input designs | Prefer for low-VF 3.3/5 V rail rectification where VRRM margin is not required |
Compared with RB520S-40T2R and NSVR0230HT1G, the 1SS355 R9G uniquely balances 90 V VRRM, sub-4 ns trr, and SOD-323F compatibility - making it the only option among the three qualified for 48 V input SMPS secondary-side and clamp roles without derating.
Availability
1SS355 R9G is available at Aetrix Electronics and suitable for switching mode power supplies, USB-C PD adapters, and on-board DC/DC converters requiring stable component supply and halogen-free compliance.
Supply support for 1SS355 R9G 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global power management and signal conditioning markets since 1979.
The 1SS355 R9G belongs to TSC's high-speed switching diode product line, engineered specifically for high-frequency SMPS, adapter, and lighting applications demanding fast recovery, low leakage, and robust MSL-1 manufacturability.
FAQ
What is the maximum reverse voltage rating for the 1SS355 R9G?
The 1SS355 R9G has a repetitive peak reverse voltage (VRRM) rating of 90 V, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet Version D2212. This rating applies at TA = 25°C and defines the highest reverse bias the 1SS355 R9G can block continuously without breakdown. Derating is required above 25°C ambient per the TJ = –65 °C to +150 °C specification.
Does the 1SS355 R9G meet RoHS and halogen-free requirements?
Yes, the 1SS355 R9G is RoHS compliant and halogen-free per IEC 61249-2-21, confirmed by the "G" suffix in its ordering code. The device uses green molding compound and matte tin-plated leads over nickel underplate. Taiwan Semiconductor's documentation explicitly states compliance in the ordering information section of the 1SS355 R9G datasheet.
What is the reverse recovery time (trr) test condition for the 1SS355 R9G?
The 1SS355 R9G reverse recovery time is specified as ≤4 ns under conditions of IF = 10 mA, RL = 100 Ω, and VR = 6 V, per the Electrical Specifications table in the official Taiwan Semiconductor datasheet. This measurement reflects performance in typical high-frequency switching environments and is validated using pulse testing with defined waveform parameters.
Can the 1SS355 R9G be used in place of the 1SS355 RRG?
Yes, the 1SS355 R9G and 1SS355 RRG share identical electrical specifications, SOD-323F package, and marking code "S4". The only difference is packaging quantity: R9G ships in 10,000-unit 13″ tape-and-reel versus RRG's 3,000-unit 7″ reel. No design or layout changes are needed when substituting 1SS355 R9G for 1SS355 RRG.
What is the thermal resistance (RθJA) of the 1SS355 R9G in standard JEDEC PCB layout?
Taiwan Semiconductor does not publish RθJA for the 1SS355 R9G in the provided datasheet. However, based on SOD-323F package characteristics and industry-standard 2-layer JEDEC test board (1 sq-in copper pad), typical RθJA falls between 350–450 °C/W. For thermal design, engineers should use the 200 mW power dissipation limit and TJ max = +150 °C to calculate allowable ambient rise for the 1SS355 R9G.
1SS355 R9G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 80 V
- Current - Average Rectified (Io):
- 150mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 100 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 4 ns
- Current - Reverse Leakage @ Vr:
- 100 nA @ 80 V
- Capacitance @ Vr, F:
- 4pF @ 500mV, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
- Operating Temperature - Junction:
- -65°C ~ 150°C
1SS355 R9G FAQ
1.How can I place an order for 1SS355 R9G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SS355 R9G 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 1SS355 R9G reliable?
The price and inventory of 1SS355 R9G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SS355 R9G is usually 5 days.
3.What payment methods are accepted for 1SS355 R9G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SS355 R9G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SS355 R9G?
1SS355 R9G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SS355 R9G 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 1SS355 R9G?
For technical support, including 1SS355 R9G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SS355 R9G requirements.
6.How does Aetrix verify that 1SS355 R9G is sourced from the original manufacturer or authorized distributors?
All 1SS355 R9G 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 1SS355 R9G meets industry standards.
7.What is the process for return or replacement of 1SS355 R9G?
All 1SS355 R9G units undergo pre-shipment inspection (PSI). If there is an issue with 1SS355 R9G, 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 1SS355 R9G part is unused and in its original packaging.
Return procedure for 1SS355 R9G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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