Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Isolators > Optocouplers, Optoisolators > Transistor, Photovoltaic Output Optoisolators

Vishay Semiconductor Opto Division TCLT1008

Name: TCLT1008
Brand: Vishay Semiconductor Opto Division
SKU: TCLT1008
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: TCLT1008

Manufacturer:: Vishay Semiconductor Opto Division

Category:: Transistor, Photovoltaic Output Optoisolators

Package:: 4-SMD, Gull Wing

Datasheet:: TCLT1008.pdf

Description:: OPTOISOLATR 5KV TRANSISTOR 4-SOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:14,894

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

TCLT1008 from Vishay Semiconductors is a phototransistor-output optocoupler in SOP-4L package, featuring 130–260% current transfer ratio (CTR) at 5 V_CE/5 mA_IF, 70 V_CEO collector-emitter breakdown voltage, and 1050 V_IORM reinforced isolation rating-designed for feedback control in isolated DC-DC converters.

For engineers reviewing the TCLT1008 datasheet, TCLT1008 pinout, TCLT1008 application, or TCLT1008 equivalent, this device supports high-reliability galvanic isolation in switchmode power supplies, microprocessor system interfaces, and industrial I/O modules where creepage >8 mm and low coupling capacitance (<0.3 pF) are critical.

Technical Context

The TCLT1008 integrates a GaAs infrared LED optically coupled to a silicon NPN phototransistor with base left unconnected (common-emitter configuration), enabling DC input-to-DC output signal transfer without external biasing. Its internal construction ensures VIORM = 1050 V and creepage/clearance ≥8.0 mm per DIN EN 60747-5-5.

It operates across -55 °C to +100 °C ambient temperature, supports 100 mA peak collector current (ICM), and delivers 6 µs typical turn-on time (ton) and 5 µs typical turn-off time (toff) under non-saturated conditions with RL = 100 Ω-optimized for fast-response feedback loops in regulated power stages.

Key Specifications

Parameter	Value and Actual Design Meaning
CTR (5 V_CE, 5 mA_IF)	130–260 % - ensures robust drive margin for phototransistor saturation across manufacturing spread and temperature drift
V_CEO	70 V - supports direct interface with 24 V/48 V secondary-side control circuits without external clamping
V_IORM	1050 V - meets reinforced insulation requirements for medical and industrial AC/DC power supplies per IEC 62368-1
Coupling capacitance	0.3 pF max - minimizes high-frequency noise coupling across isolation barrier in EMI-sensitive applications
Creepage & clearance	8.0 mm - satisfies basic and reinforced insulation spacing for 300 V_RMS working voltage systems
Isolation test voltage	5000 V_RMS - validates dielectric integrity during production screening per UL 1577 and VDE 0884
Operating temperature	-55 °C to +100 °C - enables deployment in extended-range industrial motor drives and outdoor power electronics

Pinout & Package

SOP-4L (Small Outline Package, 4-lead, long mini-flat) with 10.2 mm body length, 2.54 mm lead pitch, and gull-wing surface-mount terminals. RoHS-compliant, Pb-free, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode)	LED anode input	Accepts forward current up to 60 mA; requires series resistor for 3.3 V/5 V logic-level drive
2 (Cathode)	LED cathode return	Reference node for input-side current loop; ties to GND or negative rail of isolated input domain
3 (Collector)	Phototransistor collector output	Active-high open-collector output; pulls up via external resistor to isolated V_CC (≤70 V)
4 (Emitter)	Phototransistor emitter return	Output-side reference; connects to isolated GND or low-side switch node in feedback path

Key Features

Feature	Design Value
Reinforced isolation rating	VIORM = 1050 V - certified to UL, cUL, VDE 0884, BSI, FIMKO, CQC for safety-critical isolation
Low coupling capacitance	0.3 pF - suppresses common-mode transients >1 kV/µs in high dv/dt environments like motor inverters
High CTR range	130–260 % at 5 mA - reduces required LED drive current and improves power efficiency in battery-backed systems
Extended temperature operation	-55 °C to +100 °C - maintains stable CTR and switching performance in automotive engine control units
Fast switching	ton = 6 µs, toff = 5 µs - enables PWM feedback bandwidth >100 kHz in digitally controlled SMPS

Applications

Switchmode Power Supply Feedback	Industrial PLC Digital Input
Use Scenario: Isolated voltage sensing and error amplification in 30–500 W AC/DC adapters and DC/DC converters. IC Role / Device Role / Timing Role: Primary-side controller feedback signal translator across isolation barrier using optically coupled current loop. Use Value: Enables stable regulation with 130–260 % CTR margin and 70 V_CEO headroom for transient overvoltage tolerance.	Use Scenario: 24 V DC field sensor signal conditioning in programmable logic controller input modules. IC Role / Device Role / Timing Role: Galvanic isolator converting industrial sensor ON/OFF states into clean logic-compatible signals on controller side. Use Value: 8.0 mm creepage and 1050 V_IORM ensure immunity to ground-loop noise and surge events per IEC 61000-4-5.
Microprocessor System Interface	Motor Drive Fault Signaling
Use Scenario: Safe communication between MCU and high-voltage gate driver ICs in servo drives and inverters. IC Role / Device Role / Timing Role: Bidirectional status reporting channel (e.g., fault flag, ready signal) with optical decoupling. Use Value: 6 µs turn-on time supports real-time fault response within <10 µs window for IGBT short-circuit protection.	Use Scenario: Isolating overcurrent and thermal shutdown signals from motor phase legs to central control unit. IC Role / Device Role / Timing Role: High-speed fault event detector interfacing isolated current sensors to safety logic. Use Value: 0.3 pF coupling capacitance prevents false triggering from 5 kV surge transients on motor windings.

Switchmode Power Supply Feedback

Industrial PLC Digital Input

Use Scenario: Isolated voltage sensing and error amplification in 30–500 W AC/DC adapters and DC/DC converters.

IC Role / Device Role / Timing Role: Primary-side controller feedback signal translator across isolation barrier using optically coupled current loop.

Use Value: Enables stable regulation with 130–260 % CTR margin and 70 V_CEO headroom for transient overvoltage tolerance.

Use Scenario: 24 V DC field sensor signal conditioning in programmable logic controller input modules.

IC Role / Device Role / Timing Role: Galvanic isolator converting industrial sensor ON/OFF states into clean logic-compatible signals on controller side.

Use Value: 8.0 mm creepage and 1050 V_IORM ensure immunity to ground-loop noise and surge events per IEC 61000-4-5.

Microprocessor System Interface

Motor Drive Fault Signaling

Use Scenario: Safe communication between MCU and high-voltage gate driver ICs in servo drives and inverters.

IC Role / Device Role / Timing Role: Bidirectional status reporting channel (e.g., fault flag, ready signal) with optical decoupling.

Use Value: 6 µs turn-on time supports real-time fault response within <10 µs window for IGBT short-circuit protection.

Use Scenario: Isolating overcurrent and thermal shutdown signals from motor phase legs to central control unit.

IC Role / Device Role / Timing Role: High-speed fault event detector interfacing isolated current sensors to safety logic.

Use Value: 0.3 pF coupling capacitance prevents false triggering from 5 kV surge transients on motor windings.

Equivalent & Alternatives

The following parts are listed as comparable options for similar phototransistor-output optocoupler applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLP185(GB-TP,F)	CTR 80–160 % (5 mA), V_CEO = 80 V, VIORM = 3750 V, SO-6 package	Higher isolation voltage but larger footprint; requires PCB layout change	Select when >3 kV_RMS isolation is mandated and SOP-4L footprint cannot be reused
PC817XNIP0X	CTR 130–260 % (5 mA), V_CEO = 35 V, VIORM = 5000 V_RMS, DIP-4/SOP-4 variants	Lower V_CEO limits use to ≤24 V secondary circuits; same CTR range and SOP-4L option available	Choose for cost-sensitive designs where 35 V_CEO suffices and UL/VDE dual certification is not required

Compared with TCLT1008, TLP185 offers higher isolation voltage but demands SO-6 layout rework, while PC817XNIP0X matches CTR and package but trades 70 V_CEO for lower voltage rating-making TCLT1008 optimal for 48 V bus feedback with compact SOP-4L integration.

Availability

TCLT1008 is available at Aetrix Electronics and suitable for switchmode power supplies, industrial PLC digital inputs, and microprocessor system interfaces requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for TCLT1008 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

Vishay Semiconductors is a global leader in discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors for industrial, automotive, and computing markets.

The TCLT100. series was developed specifically for high-density, high-isolation feedback applications in compact power converters and industrial control systems-emphasizing low profile, high CTR flexibility, and safety-certified packaging.

FAQ

What is the guaranteed CTR range for TCLT1008 at 5 mA input current?

The TCLT1008 guarantees a current transfer ratio of 130 % to 260 % when tested at V_CE = 5 V and I_F = 5 mA per Vishay's datasheet Rev. 3.0. This range reflects production lot variation and ensures sufficient gain margin for reliable phototransistor saturation across temperature and aging-critical for stable feedback loop operation in TCLT1008-based power supply designs.

Does TCLT1008 support base connection for improved linearity or speed?

No, the TCLT1008 uses a base-open phototransistor configuration-its base terminal is not brought out. This design prioritizes simplicity, high CTR, and noise immunity over analog linearity. For applications requiring linearized transfer or faster switching, consider Vishay's ILD213T (base-connected) or high-speed digital optocouplers like VO1263A instead of TCLT1008.

What safety certifications does TCLT1008 hold, and what do they cover?

TCLT1008 is certified by UL, cUL, DIN EN 60747-5-5 (VDE 0884), BSI, FIMKO, and CQC for reinforced insulation. These approvals validate its 5000 V_RMS isolation test voltage, 1050 V_IORM, 8.0 mm creepage, and partial discharge performance-covering safe operation in end equipment compliant with IEC 62368-1, IEC 60950-1, and IEC 61800-5-1 standards.

Can TCLT1008 replace TCLT1003 in an existing design without layout changes?

Yes-TCLT1008 and TCLT1003 share identical SOP-4L package dimensions, pinout, and absolute maximum ratings. The only difference is CTR range (TCLT1003: 100–200 %; TCLT1008: 130–260 %). Substituting TCLT1008 may improve noise immunity and reduce required LED drive current, but verify loop stability if original design operated near minimum CTR margin.

What is the maximum recommended forward current for continuous operation of TCLT1008?

The absolute maximum rated forward current for TCLT1008 is 60 mA, but the recommended continuous operating limit is 50 mA per the datasheet's derating curve (Fig. 1). At 50 mA and 25 °C ambient, power dissipation remains within the 100 mW LED rating. Exceeding this risks accelerated LED degradation and CTR drift-always include a series resistor sized for worst-case V_F (1.6 V max) and supply voltage in TCLT1008 applications.

TCLT1008 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Semiconductor Opto Division

Series:: -

Package/Case:: 4-SMD, Gull Wing

Packaging:: Tape & Reel (TR)

Product Status:: Active

Number of Channels:: 1

Voltage - Isolation:: 5000Vrms

Current Transfer Ratio (Min):: 130% @ 5mA

Current Transfer Ratio (Max):: 260% @ 5mA

Turn On / Turn Off Time (Typ):: 6µs, 5µs

Rise / Fall Time (Typ):: 3µs, 4.7µs

Input Type:: DC

Output Type:: Transistor

Voltage - Output (Max):: 70V

Current - Output / Channel:: 50mA

Voltage - Forward (Vf) (Typ):: 1.25V

Current - DC Forward (If) (Max):: 60 mA

Vce Saturation (Max):: 300mV

Grade:: -

Qualification:: -

Operating Temperature:: -55°C ~ 100°C

Mounting Type:: Surface Mount

Supplier Device Package:: 4-SOP

TCLT1008 FAQ

1.How can I place an order for TCLT1008 through Aetrix?

Please submit a Request for Quotation (RFQ) for TCLT1008 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 TCLT1008 reliable?

The price and inventory of TCLT1008 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCLT1008 is usually 5 days.

3.What payment methods are accepted for TCLT1008?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TCLT1008 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TCLT1008?

TCLT1008 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TCLT1008 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 TCLT1008?

For technical support, including TCLT1008 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCLT1008 requirements.

6.How does Aetrix verify that TCLT1008 is sourced from the original manufacturer or authorized distributors?

All TCLT1008 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 TCLT1008 meets industry standards.

7.What is the process for return or replacement of TCLT1008?

All TCLT1008 units undergo pre-shipment inspection (PSI). If there is an issue with TCLT1008, 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 TCLT1008 part is unused and in its original packaging.

Return procedure for TCLT1008:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

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, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

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.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

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.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

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…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

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…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

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…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

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 …