LTV-817S-TA1-D

LTV-817S-TA1-D is a single-channel optocoupler (optoisolator) from Lite-On. It provides galvanic isolation between its LED input and phototransistor output, enabling safe signal transfer between low‑voltage control circuits and high‑voltage/noisy environments.
Key points:
- Configuration: 4-pin DIP, LED input drives a phototransistor output.
- Isolation: typically rated for a high isolation voltage (several kilovolts RMS minimum) between input and output.
- Output: phototransistor can sink moderate current; commonly used with up to tens of milliamps and a volt rating (Vceo) around 80 V.
- Input: LED forward current up to about 20 mA; CTR (transfer ratio) varies with IF and temperature.
- Packaging: TA1-D denotes a specific packaging/ tape-and-reel option; check the datasheet for exact packaging details.
- Applications: isolating microcontroller or logic circuits from mains/industrial equipment, isolated feedback in power supplies, sensor interfaces, and other signal-isolation tasks.
Note: For exact CTR, timing, and maximum ratings, refer to the official LTV-817S-TA1-D datasheet.

Here are the typical features of LTV-817S-TA1-D (optocoupler):
- 4‑pin DIP optocoupler with phototransistor output
- Input/Output isolation voltage: up to about 5 kV RMS min (between LED and transistor)
- CTR (current transfer ratio): wide range, ~50–600% depending on IF and temperature (at IF ≈ 20 mA, VCE ≈ 5 V)
- Input: infrared LED, forward current recommended around 20 mA (operating range ~5–60 mA)
- Output: NPN phototransistor
- Output voltage rating: VCEo typically ~80 V
- Fast switching capability (typical microsecond-scale) for logic/interfacing
- Temperature range: broad (-40 to 100°C) suitable for many environments
- Packaging: standard DIP-4; TA1-D option indicates tape & reel packaging for automated assembly
- Compliance: RoHS/Pb-free
Applications: signal isolation, microcontroller/logic interfacing, isolated power/control, data transmission across barriers.
Note: Exact CTR, switching times, and voltage specs depend on batch and conditions; consult the latest datasheet for precise numbers.

Package: DIP-4 (4-pin) through-hole optocoupler. The TA1-D variant denotes the Tape-and-Reel packaging option.

Pin count: 4 pins.
Function: LTV-817S-TA1-D is an optocoupler (photocoupler). The input LED is on pins 1 (anode) and 2 (cathode); the output transistor is on pins 3 (emitter) and 4 (collector).

- Manufacturer: Lite-On (Lite-On Technology Corporation / Lite-On Semiconductor)
- What kind of company: A Taiwanese multinational electronics components manufacturer specializing in optoelectronics (including optocouplers), LEDs, power modules, and related parts.

- Isolated signal transfer between low-voltage control logic (MCUs/PLCs) and high-voltage/high-current circuits
- Microcontroller/PLC input-output interfaces and data communications
- Gate drive for transistors/MOSFETs and drivers for relays/triacs in power electronics
- Isolated feedback in switch-mode power supplies and inverters
- Industrial instrumentation, sensors and safety-critical systems requiring electrical isolation

Equivalent pin-compatible optocouplers (DIP-4, transistor output):
- Sharp PC817
- Everlight EL817
- Vishay 4N25 (also 4N26)
Note: CTR varies by device; verify CTR and packaging (TA1-D) for your application.