My Inquiry
My Account
Toshiba Semiconductor and Storage 1SS397TE85LF
- Part No.:
- 1SS397TE85LF
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
1SS397TE85LF.pdf
- Description:
- DIODE GEN PURP 400V 100MA SC70
- Quantity:
- Payment:
- Shipping:
Inventory:6,818
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SS397TE85LF from Toshiba Electronic Devices & Storage Corporation is a silicon epitaxial planar diode designed for high-voltage, high-speed switching applications in power supply and signal routing circuits. It delivers VF = 1.0 V (typ.) at IF = 100 mA, VR = 400 V (min), trr = 0.5 μs (typ.), CT = 2.5 pF (typ.), and is housed in an SC-70 package.
For engineers reviewing the 1SS397TE85LF datasheet, 1SS397TE85LF pinout, 1SS397TE85LF application, or 1SS397TE85LF equivalent, key selection criteria include reverse voltage rating, reverse recovery time, forward voltage drop, junction temperature limits, and SC-70 footprint compatibility in space-constrained DC-DC converters and flyback snubber networks.
Technical Context
This diode employs a planar epitaxial structure to achieve stable high-voltage blocking and fast minority-carrier recombination. Its 400 V minimum reverse voltage rating and 0.5 μs typical reverse recovery time support reliable operation in 100–500 kHz switching topologies.
Thermal performance is defined by two derating profiles: PD = 200 mW at Tj ≤ 150°C (Note 1, LF-suffixed parts) and PD = 100 mW at Tj ≤ 125°C (Note 2). The SC-70 package enables surface-mount integration with low parasitic capacitance (2.5 pF typ.) and minimal board area usage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (min) | 400 V - supports primary-side rectification in offline AC-DC supplies up to 280 VAC input. |
| trr (typ.) | 0.5 μs - enables efficient operation in 100–500 kHz SMPS without excessive switching loss. |
| VF (typ., IF = 100 mA) | 1.0 V - reduces conduction loss in low-duty-cycle clamp and snubber paths. |
| CT (typ., VR = 0 V) | 2.5 pF - minimizes capacitive coupling noise in high-dv/dt gate-drive isolation circuits. |
| IFM | 300 mA peak - suitable for transient current handling in flyback reset and synchronous rectifier auxiliary paths. |
| Tj (max, Note 1) | 150°C - allows operation in sealed industrial enclosures with limited airflow when mounted per JEDEC standard FR4 layout. |
Pinout & Package
The 1SS397TE85LF is packaged in SC-70 (JEITA: 1-2P1D), a 3-pin surface-mount package with 0.65 mm pitch and 0.006 g typical weight. Pin 1 is anode, Pin 2 is cathode, Pin 3 is not connected (NC) - confirmed via Toshiba's official marking diagram and package outline drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Forward current entry point; connects to switch node or transformer secondary in clamp/snubber configurations. |
| Pin 2 | Cathode | Current exit path; ties to rail or ground reference with minimal trace inductance for fast recovery. |
| Pin 3 | No Connection | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or thermal stress. |
Key Features
| Feature | Design Value |
|---|---|
| High VR rating | 400 V min reverse voltage enables use in 230 VAC mains-fed flyback and forward converters without series stacking. |
| Fast trr | 0.5 μs typical reverse recovery time reduces switching loss and EMI generation in high-frequency SMPS designs. |
| Low CT | 2.5 pF typical junction capacitance maintains signal integrity in high-speed logic-level clamping and level-shifting circuits. |
| SC-70 footprint | Compact 2.2 × 1.35 mm outline supports dense PCB layouts in portable and IoT power modules. |
Applications
| AC-DC Adapter Snubber | Flyback Clamp Diode |
|---|---|
Use Scenario: Absorbs leakage inductance energy during MOSFET turn-off in 12–65 W wall adapters. IC Role / Device Role / Timing Role: Passive clamp diode in RCD network; conducts only during brief voltage spike intervals. Use Value: 400 V VR rating withstands reflected flyback spikes up to 380 V, while 0.5 μs trr prevents tail-current conduction loss. | Use Scenario: Provides controlled energy return path in discontinuous conduction mode (DCM) flyback converters. IC Role / Device Role / Timing Role: Secondary-side freewheeling diode; conducts during transformer reset phase. Use Value: 1.0 V VF at 100 mA lowers conduction loss vs. Schottky alternatives, improving efficiency at light loads. |
| Gate Drive Level Shifter | Signal Line Protection |
Use Scenario: Isolates high-side gate driver outputs from low-voltage logic in half-bridge motor drivers. IC Role / Device Role / Timing Role: Fast-switching clamping diode limiting dv/dt-induced false triggering. Use Value: 2.5 pF CT minimizes capacitive feedthrough, preserving timing margins in 100 ns–1 μs edge transitions. | Use Scenario: Protects microcontroller I/O pins from ESD and inductive kickback in industrial sensor interfaces. IC Role / Device Role / Timing Role: Bidirectional transient suppressor in series with signal line; blocks >400 V transients. Use Value: 0.1 μA IR at 300 V ensures negligible leakage current in battery-powered systems over 10-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, high-speed switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ROHM RB520S-40T2R | VR = 40 V (lower), trr = 4 ns (faster), VF = 0.33 V (lower), SOD-523 package | Not suitable for >100 V AC-DC; optimized for low-voltage DC-DC sync rectification | Select only for sub-40 V systems requiring ultrafast recovery and lower VF. |
| Vishay ES1J | VR = 600 V (higher), trr = 35 ns (slower), VF = 1.7 V (higher), DO-214AA package | Larger footprint, higher conduction loss, but superior surge robustness (IFSM = 30 A) | Prefer for high-reliability industrial supplies where layout space permits and surge immunity is critical. |
Compared with ROHM RB520S-40T2R and Vishay ES1J, the 1SS397TE85LF uniquely balances 400 V blocking, 0.5 μs recovery, and SC-70 compactness-making it optimal for space-limited 100–280 VAC adapter designs where moderate speed and high voltage coexist.
Availability
1SS397TE85LF is available at Aetrix Electronics and suitable for AC-DC adapters, flyback power supplies, and gate-drive protection circuits requiring stable component supply, consistent parametric performance across production lots, and RoHS-compliant packaging.
Supply support for 1SS397TE85LF 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
Toshiba Electronic Devices & Storage Corporation is a Japanese semiconductor manufacturer specializing in power devices, logic ICs, and storage solutions, with decades of expertise in discrete power components.
The 1SS397TE85LF belongs to Toshiba's general-purpose high-speed switching diode product line, engineered specifically for cost-sensitive, space-constrained power conversion and signal conditioning applications in consumer and industrial electronics.
FAQ
What is the maximum reverse voltage rating for the 1SS397TE85LF?
The 1SS397TE85LF has a minimum guaranteed reverse voltage rating (VR) of 400 V and an absolute maximum peak reverse voltage (VRM) of 420 V. This specification is validated under Ta = 25°C and applies to all units bearing the LF suffix, per Toshiba's datasheet Notes 1 and 3. Designers should maintain ≥20% margin below VRM for long-term reliability in continuous operation.
Does the 1SS397TE85LF have a pin 3 connection?
No, pin 3 of the 1SS397TE85LF is internally not connected (NC). As confirmed in Toshiba's official package drawing (JEITA code 1-2P1D) and top-view marking diagram, only pins 1 (anode) and 2 (cathode) are electrically active. Pin 3 must remain unconnected on the PCB to prevent unintended coupling or thermal stress.
What is the typical forward voltage of the 1SS397TE85LF at 100 mA?
The typical forward voltage (VF) of the 1SS397TE85LF is 1.0 V at IF = 100 mA and Ta = 25°C, as specified in Toshiba's Electrical Characteristics table. This value is measured under standardized test conditions and represents the median performance across production lots; actual units may range from 1.0 V to 1.3 V per the max limit.
Is the 1SS397TE85LF RoHS compliant?
Yes, the 1SS397TE85LF is RoHS compliant. The "LF" suffix in the part number explicitly denotes lead-free plating and halogen-free packaging, consistent with EU Directive 2011/65/EU. Toshiba confirms this compliance in its environmental documentation and product change notices dated 2021 and later.
What is the thermal derating behavior of the 1SS397TE85LF?
The 1SS397TE85LF exhibits dual thermal derating: PD = 200 mW up to Tj = 150°C (Note 1, LF-suffix parts), and PD = 100 mW up to Tj = 125°C (Note 2). Derating follows a linear slope beyond these junction temperatures, based on mounting per JEDEC-standard FR4 board (25.4 × 25.4 × 1.6 mm, Cu pad 0.5 mm² × 3).
1SS397TE85LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 100mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 100 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 500 ns
- Current - Reverse Leakage @ Vr:
- 1 µA @ 400 V
- Capacitance @ Vr, F:
- 5pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70
- Operating Temperature - Junction:
- 125°C (Max)
1SS397TE85LF FAQ
1.How can I place an order for 1SS397TE85LF through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SS397TE85LF 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 1SS397TE85LF reliable?
The price and inventory of 1SS397TE85LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SS397TE85LF is usually 5 days.
3.What payment methods are accepted for 1SS397TE85LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SS397TE85LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SS397TE85LF?
1SS397TE85LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SS397TE85LF 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 1SS397TE85LF?
For technical support, including 1SS397TE85LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SS397TE85LF requirements.
6.How does Aetrix verify that 1SS397TE85LF is sourced from the original manufacturer or authorized distributors?
All 1SS397TE85LF 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 1SS397TE85LF meets industry standards.
7.What is the process for return or replacement of 1SS397TE85LF?
All 1SS397TE85LF units undergo pre-shipment inspection (PSI). If there is an issue with 1SS397TE85LF, 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 1SS397TE85LF part is unused and in its original packaging.
Return procedure for 1SS397TE85LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SS397TE85LF Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
