TS117S - 350V 1-Form-A OptoMOS Telecom Switch | IXYS
MPN： TS117S ✓ 啟用中TS117S 概覽
An optocoupler (also called an opto-isolator) is a semiconductor device that transfers an electrical signal between two isolated circuits using an internal infrared LED and a photodetector. Solid-state relays (SSRs) replace mechanical relays with MOSFET outputs, providing silent switching, no contact bounce, and orders-of-magnitude longer mechanical life. The TS117S combines both functions into one IC, occupying the role of a galvanically-isolated switch inside the broader hierarchy: SSR -> semiconductor switch -> discrete power semiconductor -> power management component.
Key features include 35 ohm typical on-resistance, <1 mA LED trigger current, 50 pF typical output capacitance, and surge withstand compatible with telecom ringing and on-hook/off-hook transients. The SMD-8 footprint supports automated assembly and reflow soldering, and the device carries 3750 Vrms safety isolation between input and output. The TS117S ships with tin-lead or lead-free (RoHS-compliant) terminal finish options.
The TS117S architecture places an AlGaAs infrared LED on the input side that drives two back-to-back MOSFET output switches on the load side, providing AC/DC switching capability. The lack of moving parts gives unlimited operational cycles and eliminates the acoustic noise of electromechanical relays. Built-in current-limiting and thermal considerations make it robust against inductive kick and short-duration overloads typical of telephone-line transient events.
Typical applications include telecom line-interface cards (SLIC hook-switch / ring-trip / test access), modem and fax line switching, PBX trunk cards, instrumentation multiplexing, and process-control I/O isolation. The compact 8-pin SMD package suits high-density line-card designs where board area is at a premium.
When designing with this part, ensure the LED input current is at least 5 mA for reliable turn-on across temperature, place a 0.1 uF bypass capacitor near the LED anode pin, and verify that the peak load voltage (including ringing transients) never exceeds the 350 V rating. The maximum isolation voltage rating of 3750 Vrms must be observed for safety-compliant creepage and clearance.
This page combines distributor pricing snapshots, drop-in cross-brand alternatives from web cross-reference data, and practical PCB-layout guidance - information not collated on any single manufacturer datasheet.
直接替換替代品，適用於 TS117S — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TS117S （相同外形與佔位） — 差異在於 Package, RoHS Status.
TS117
✅ 直接替換📋 參考替代品（不在目錄中）
TS117L
✅ 直接替換📋 參考替代品（不在目錄中）
TS117S-LF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TS117S-R1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TS117S 最大額定值與電氣特性
| Product Type | Solid-State Relay (SSR) with Optocoupler |
| Switch Configuration | 1-Form-A (Normally Open, SPST-NO) |
| Load Voltage (Peak) | 350 V |
| Load Current (Continuous) | 120 mA |
| Load Current (Short Term Pulse) | 300 mA |
| On-Resistance (Typical) | 35 ohm |
| Output Capacitance (Typical) | 50 pF |
| Input-to-Output Isolation Voltage | 3750 Vrms |
| LED Trigger Current (IFT, typical) | 1 mA |
| LED Forward Voltage (VF, typical) | 1.5 V at 10 mA |
| Turn-On Time (Ton, typical) | 1 ms |
| Turn-Off Time (Toff, typical) | 0.5 ms |
| 封裝 | 8-Pin SMD (Gull-Wing, 8-SMD) |
| 工作溫度 | -40C to +85C |
| 安裝類型 | Surface Mount |
| Terminal Finish | Matte Tin (Sn) |
| RoHS 狀態 | Compliant |
TS117S 腳位配置
| 腳位 1 | LED Anode (+) — Input-side LED anode; drive with 5-10 mA forward current through current-limiting resistor |
| 腳位 2 | LED Cathode (-) — Input-side LED cathode; connect to input-side ground |
| 腳位 3 | NC — Not connected internally; leave floating or tie to input ground |
| 腳位 4 | NC — Not connected internally; leave floating or tie to input ground |
| 腳位 5 | MOSFET Drain/Source A — Output-side MOSFET terminal A; connect to tip/ring of telecom line |
| 腳位 6 | MOSFET Source/Drain B — Output-side MOSFET terminal B; bidirectional AC/DC switching |
| 腳位 7 | NC — Not connected internally |
| 腳位 8 | NC — Not connected internally |
典型應用
TS117S 適用於 6 應用s: Telecom Line-Interface Card (SLIC Hook-Switch), Modem and Fax Line Switching, PBX Trunk and Extension Switching, Test Equipment and Instrumentation Multiplexing, Industrial Process-Control I/O Isolation, Medical Equipment Signal Routing.
Telecom Line-Interface Card (SLIC Hook-Switch)
The TS117S isolates the SLIC codec from the tip/ring pair in central-office and PBX line cards. Its 350 V peak load rating withstands the -48 V battery feed plus 90 Vrms ringing transients up to 150 V peak, while the 3750 Vrms input-to-output isolation protects the SLIC from surge events and ground-potential differences. The 35 ohm RDS(on) introduces only ~4 V drop at 120 mA loop current, preserving the off-hook detection threshold. Drive the LED from a GPIO or Darlington driver with at least 5 mA forward current for reliable turn-on across the -40C to +85C range.
推薦
Modem and Fax Line Switching
In multi-line modem pools and fax-server cards, the TS117S provides silent, bounce-free switching between telephone lines and the modem DSP. The 1 ms typical turn-on time and 0.5 ms turn-off time are fast enough for line-selection multiplexing without audible relay clicks. The optocoupler isolation prevents ground loops between line-side and modem-side grounds, which is critical when multiple carriers or PBX trunks share a backplane. The 8-SMD package is well-suited to high-density line-card designs where 16 or more ports populate a single PCB.
推薦
PBX Trunk and Extension Switching
PBX systems use the TS117S to switch trunk lines between extension cards, conferencing modules, and outside-line interfaces. The unlimited mechanical life of the solid-state output (versus ~10^5 cycles for mechanical relays) eliminates a major field-failure mode in 24/7 PBX deployments. The 300 mA short-term pulse rating handles the inrush current of ringing generators and test-access relays. Its compact 8-SMD footprint enables higher port density in 1U PBX chassis where every square centimeter of PCB real estate is allocated.
推薦
Test Equipment and Instrumentation Multiplexing
Automatic test equipment (ATE) and bench-top instrumentation use the TS117S to multiplex high-voltage signals between the device-under-test (DUT) and measurement channels. The 3750 Vrms isolation prevents ground loops between floating measurement instruments and the DUT, while the low 50 pF output capacitance minimizes capacitive loading on high-impedance analog signals. The solid-state design eliminates the contact-bounce artifacts that would otherwise corrupt fast edge measurements. Drive the LED through a precision current source for predictable turn-on timing.
推薦
Industrial Process-Control I/O Isolation
Industrial PLCs and process-control systems use the TS117S to switch 120/240 VAC discrete signals while keeping the low-voltage logic ground completely isolated from the field wiring. The 350 V peak rating covers both 120 VAC (170 V peak) and 240 VAC (340 V peak) line voltages with margin for transients. The 3750 Vrms isolation meets IEC 61131-2 requirements for industrial control system isolation. The SMD package supports automated SMT assembly on high-volume PLC backplanes where labor cost is a primary design constraint.
推薦
Medical Equipment Signal Routing
Patient-monitoring and diagnostic equipment use the TS117S to switch low-level analog signals between isolated patient leads and the acquisition front-end, where patient-safety isolation is mandatory per IEC 60601-1. The 3750 Vrms isolation provides the patient-defibrillation-proof isolation barrier required between applied parts and the equipment chassis. The solid-state design eliminates mechanical-relay failure modes that could leave a patient lead connected during a fault. Drive the LED through a current-limited source to ensure safe operation under all fault conditions.
推薦
推薦產品摘要
工程參考資料，適用於 TS117S — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TS117 | TS117L | TS117S-LF | TS117S-R1 |
|---|---|---|---|---|---|
| Brand | IXYS (Littelfuse) | IXYS (Littelfuse) | IXYS (Littelfuse) | IXYS (Littelfuse) | IXYS (Littelfuse) |
| Package | 8-SMD (Gull-Wing) | 8-DIP (through-hole) - DIFFERENT FOOTPRINT | 8-SMD (Gull-Wing) - same | 8-SMD (Gull-Wing) - same | 8-SMD (Gull-Wing) - same |
| Load Voltage (Peak) | 350 V | 350 V | 350 V | 350 V | 350 V |
| Load Current (Continuous) | 120 mA | 120 mA | 120 mA | 120 mA | 120 mA |
| On-Resistance (RDS(on)) | 35 ohm | 35 ohm | 35 ohm | 35 ohm | 35 ohm |
| Input-to-Output Isolation | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms |
| LED Trigger Current (Typical) | 1 mA | 1 mA | 1 mA | 1 mA | 1 mA |
| Current-Limiting Feature | No | No | Yes (L suffix) | No | No |
主要差異化特點
- Integrated optocoupler + 350 V MOSFET SSR in compact 8-SMD package (對比Discrete optocoupler + discrete MOSFET IRU)
- Surface-mount 8-SMD footprint for high-volume automated assembly (對比TS117 (8-DIP through-hole))
- Low 1 mA typical LED trigger current enables direct GPIO drive (對比Higher-trigger-current competitors (e.g., CPC1030N at 5 mA IFT))
設計說明
Maintain at least 8 mm creepage and clearance between the input-side pins (LED anode/cathode) and the output-side pins (MOSFET drain/source) on the PCB to preserve the 3750 Vrms safety isolation. Place a slot in the PCB under the device if the application requires reinforced isolation per IEC 60747-2. The input-side ground plane and output-side ground plane must be physically separated; do not connect them under the device footprint.
Drive the input LED with a constant-current source of 5-10 mA to ensure reliable turn-on across the full -40C to +85C temperature range. The LED forward voltage is typically 1.5 V at 10 mA; calculate the series resistor as R = (VCC - 1.5 V) / 10 mA. For 3.3 V logic drive, a 180 ohm resistor is typical. For 5 V logic, a 350 ohm resistor. Add a 0.1 uF bypass capacitor across the LED supply to suppress logic-noise-induced jitter on the LED current.
At maximum continuous load of 120 mA and 35 ohm RDS(on), the output MOSFET dissipates approximately 0.5 W. The 8-SMD package thermal resistance (theta_JA) of approximately 100 C/W produces a 50C junction-temperature rise above ambient at full load. This is acceptable for telecom applications where the ambient temperature inside a line-card chassis rarely exceeds 70C. For continuous operation near the maximum current limit, provide thermal copper-pour relief under the output pins.
Do not exceed 350 V peak on the output side, including ringing transients. Telecom tip/ring pairs can ring to 150 V peak during on-hook transitions, and the -48 V battery feed plus transients can reach 100 V peak during off-hook; ensure the sum stays below the 350 V rating with margin. Do not apply reverse voltage exceeding the output MOSFET rating. Do not connect the input-side and output-side grounds together; the device relies on galvanic isolation for safety.
合規資訊
RoHS compliance verified from LCSC and DigiKey product listings. The -LF suffix variant guarantees lead-free terminal finish. Halogen-free status not explicitly stated in the verified data; confirm with Littelfuse for halogen-free certification if required for your application.
