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Taiwan Semiconductor Corporation RS1KM
- Part No.:
- RS1KM
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
RS1KM.pdf
- Description:
- DIODE GEN PURP 800V 1A MICRO SMA
- Quantity:
- Payment:
- Shipping:
Inventory:11,956
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Product details
Overview
RS1KM from Taiwan Semiconductor is a 1A, 800V fast recovery surface-mount rectifier in Micro SMA package, featuring 500 ns reverse recovery time, 1.30 V max forward voltage at 1 A, and 20 A surge capability-used in DC-DC converters and switching inverters for high-efficiency power conversion.
For engineers reviewing the RS1KM datasheet, RS1KM pinout, RS1KM application, or RS1KM equivalent, key selection criteria include rated peak reverse voltage (800 V), thermal resistance (RθJL = 25 °C/W), junction temperature range (–55 to +150 °C), and Micro SMA mechanical compatibility with automated SMT placement.
Technical Context
The RS1KM is a single-die, unidirectional fast recovery rectifier optimized for high-frequency switching applications. Its 800 V VRRM, 500 ns trr, and low RθJA (95 °C/W) support stable operation under repetitive surge conditions and elevated ambient temperatures up to 125 °C.
Designed for surface-mount assembly, it uses matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 1A whisker resistance. Polarity is marked by a cathode band, and moisture sensitivity is rated Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - maximum non-repetitive reverse blocking voltage; defines safe operating limit in high-voltage DC bus or flyback clamp circuits |
| IF | 1 A continuous - average forward current rating at TA = 25 °C; derates linearly above 25 °C per forward current curve |
| IFSM | 20 A - peak non-repetitive surge current (8.3 ms half-sine); supports inrush and transient overload without failure |
| trr | 500 ns - measured at IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; enables efficient operation in 100+ kHz SMPS topologies |
| VF (max) | 1.30 V - forward voltage drop at IF = 1 A, TJ = 25 °C; directly determines conduction loss and thermal rise in power stage |
| RθJL | 25 °C/W - junction-to-lead thermal resistance; enables direct PCB copper pad heat sinking without external heatsink |
| TJ (max) | +150 °C - maximum allowable junction temperature; sets upper thermal boundary for reliability in enclosed or high-ambient environments |
Pinout & Package
Package: Micro SMA - surface-mount, single-ended, cathode-band-marked plastic case meeting UL 94V-0; dimensions per Taiwan Semiconductor package outline drawing (Version B2103); weight ≈ 0.006 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input terminal for forward conduction | Connected to lower-potential side (e.g., transformer secondary center-tap or switch node return path) |
| Cathode | Output terminal for forward conduction | Marked by band; connects to output rail or filter capacitor positive; carries full load current in forward bias |
Key Features
| Feature | Design Value |
|---|---|
| Fast recovery time | 500 ns - reduces switching losses and EMI in high-frequency converters (e.g., 200–500 kHz PFC stages) |
| High surge current rating | 20 A IFSM - withstands repeated cold-start surges and line transients without degradation |
| Low thermal resistance | RθJL = 25 °C/W - allows effective heat transfer to PCB copper, supporting compact layout without thermal vias |
| Automated placement compatibility | Micro SMA footprint and matte tin plating - ensures reliable pick-and-place yield and solder joint integrity per J-STD-002 |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS Directive - required for industrial and consumer end-equipment certification |
Applications
| DC-DC Converter | Switching Inverter |
|---|---|
Use Scenario: Isolated buck-boost or flyback converter in telecom power supply delivering 12 V/5 A output from 370–400 V DC bus. IC Role / Device Role / Timing Role: Output rectifier handling 1 A average current with 800 V reverse standoff during MOSFET off-time. Use Value: 500 ns trr minimizes reverse recovery charge loss, improving efficiency >92% at full load. | Use Scenario: Single-phase H-bridge inverter driving 24 V BLDC motor with regenerative braking. IC Role / Device Role / Timing Role: Freewheeling diode across each low-side MOSFET, clamping inductive kickback. Use Value: 20 A IFSM safely absorbs 15 A brake-current spikes without thermal runaway. |
| AC-DC Adapter | Industrial Sensor Power |
Use Scenario: Compact 10 W wall adapter converting 90–264 V AC to 5 V DC using QR flyback topology. IC Role / Device Role / Timing Role: Secondary-side rectifier operating at 65 kHz switching frequency with discontinuous conduction mode. Use Value: 1.30 V VF limits conduction loss to <120 mW, enabling >85% efficiency in 20 mm × 30 mm form factor. | Use Scenario: 24 V input power conditioning for analog sensor module in factory automation PLC rack. IC Role / Device Role / Timing Role: Input protection and polarity guard before LDO regulator, exposed to field wiring reversals. Use Value: 800 V VRRM provides margin against 600 V transients on industrial 24 V lines per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R08 | Same 1 A / 800 V rating; trr = 500 ns; VF = 1.35 V (max); Micro SMA package; RθJL = 27 °C/W | Slightly higher VF increases conduction loss by ~4% at 1 A; identical surge and thermal specs | Acceptable where 50 mV higher VF is tolerable and STMicroelectronics sourcing is preferred |
| MBR160 | Lower VRRM = 60 V; Schottky (not fast recovery); VF = 0.75 V; same 1 A rating; SMA package | Not suitable for 800 V applications; only viable in low-voltage (<100 V) DC-DC outputs | Select only for sub-100 V systems requiring ultra-low VF; not a functional replacement for RS1KM |
Compared with STTH1R08, RS1KM offers marginally lower VF and better thermal resistance; versus MBR160, RS1KM provides essential 800 V blocking capability absent in Schottky alternatives-making it irreplaceable in high-voltage flyback or PFC front-end rectification.
Availability
RS1KM is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial sensor power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for RS1KM 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs.
The RS1KM belongs to TSC's RS1xM fast recovery rectifier family, engineered for high-efficiency, high-voltage switching power supplies where fast recovery, robust surge handling, and SMT manufacturability are critical.
FAQ
What is the maximum junction temperature rating for RS1KM?
The RS1KM has a maximum junction temperature (TJ) of +150 °C, verified per absolute maximum ratings table in Taiwan Semiconductor's B2103 datasheet. This rating applies under steady-state and transient conditions, provided thermal design maintains actual TJ ≤ 150 °C. Derating curves confirm usable current down to zero at 150 °C ambient when mounted on standard FR-4 with minimal copper.
Does RS1KM have a cathode marking, and how is polarity identified?
Yes, RS1KM uses a visible cathode band on the device body to indicate polarity, consistent with Micro SMA industry convention. The banded end is the cathode terminal, and the opposite end is the anode. This marking aligns with JEDEC MS-012 and is confirmed in the "Marking Diagram" section of the B2103 datasheet.
What is the reverse recovery time (trr) of RS1KM, and under what test conditions is it specified?
The RS1KM reverse recovery time is 500 ns, measured under the condition: IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A, per the electrical specifications table in Version B2103. This value is distinct from RS1JM (250 ns) and reflects the trade-off between higher VRRM and recovery speed in the same platform.
Is RS1KM suitable for use in automotive applications?
No-RS1KM is not qualified to AEC-Q101 or automotive-grade reliability standards. Taiwan Semiconductor explicitly states in its notice that products in the RS1xM series are "not designed for use in medical, life-saving, or life-sustaining applications," and no automotive qualification data is published for RS1KM. It is intended for industrial, consumer, and computing power supplies.
What packaging option is available for RS1KM, and what is the reel quantity?
RS1KM is supplied in tape-and-reel packaging only, with 12,000 units per reel, as specified in the Ordering Information section of the B2103 datasheet. The Micro SMA package is compatible with standard SMT pick-and-place equipment, and the reel meets EIA-481-D standards for automated assembly.
RS1KM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- 2-SMD, Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 800 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 500 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Micro SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
RS1KM FAQ
1.How can I place an order for RS1KM through Aetrix?
Please submit a Request for Quotation (RFQ) for RS1KM 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 RS1KM reliable?
The price and inventory of RS1KM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1KM is usually 5 days.
3.What payment methods are accepted for RS1KM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1KM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RS1KM?
RS1KM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RS1KM 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 RS1KM?
For technical support, including RS1KM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1KM requirements.
6.How does Aetrix verify that RS1KM is sourced from the original manufacturer or authorized distributors?
All RS1KM 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 RS1KM meets industry standards.
7.What is the process for return or replacement of RS1KM?
All RS1KM units undergo pre-shipment inspection (PSI). If there is an issue with RS1KM, 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 RS1KM part is unused and in its original packaging.
Return procedure for RS1KM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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