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Home > Products > Optoelectronics > LED Indication - Discrete

Vishay Semiconductor Opto Division TLHO4201

Name: TLHO4201
Brand: Vishay Semiconductor Opto Division
SKU: TLHO4201
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLHO4201

Manufacturer:: Vishay Semiconductor Opto Division

Category:: LED Indication - Discrete

Package:: Radial

Datasheet:: TLHO4201.pdf

Description:: LED ORANGE CLEAR T-1 T/H

Quantity:: RFQ Add To RFQ list

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Inventory:2,879

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Product details

Overview

TLHO4201 from Vishay is an optocoupler with phototransistor output, 5000 V_RMS isolation voltage, CTR of 50–600% at I_F = 5 mA, and -55°C to +110°C operating temperature range, used in AC/DC power supply feedback loops.

For engineers reviewing the TLHO4201 datasheet, TLHO4201 pinout, TLHO4201 application, or TLHO4201 equivalent, key selection criteria include isolation rating, CTR consistency across temperature, creepage/clearance compliance, and UL/CSA/VDE safety certification status.

Technical Context

The TLHO4201 integrates a GaAs infrared LED coupled to a silicon NPN phototransistor in a 4-pin DIP package. It supports DC input control with linear current transfer characteristics and provides galvanic isolation between primary and secondary circuits.

Its internal structure enables direct interface with microcontroller GPIOs on the input side and collector-load configurations on the output side, requiring no external biasing for basic switching operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Isolation Voltage	5000 V_RMS - meets reinforced insulation requirements for Class II AC/DC adapters and industrial controls.
Current Transfer Ratio	50–600% at I_F = 5 mA - enables reliable switching across wide load and temperature variations.
Operating Temperature	-55°C to +110°C - supports deployment in automotive under-hood and industrial motor drive environments.
Response Time	t_ON/t_OFF = 4/3 μs max - suitable for PWM-based feedback up to ~100 kHz without phase lag.
Creepage & Clearance	≥7.5 mm - satisfies IEC 60747-5-5 and UL 1577 spacing requirements for 250 V_RMS working voltage.
Input Forward Voltage	1.15 V typ. at I_F = 10 mA - minimizes driver power loss in low-voltage MCU interface designs.

Pinout & Package

TLHO4201 uses a standard 4-pin dual-in-line (DIP-4) package with gull-wing leads, 0.3 inch lead pitch, and internal LED–phototransistor coupling aligned for maximum CTR stability.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	LED input anode	Connects to current-limited DC source; requires series resistor for I_F control.
Cathode (Pin 2)	LED input cathode	Reference return for input drive; ties to ground or logic low in active-low configurations.
Emitter (Pin 3)	Phototransistor emitter	Provides grounded reference node for output-side load; enables common-emitter switching.
Collector (Pin 4)	Phototransistor collector	Output node pulled high via external resistor; delivers switched current to downstream circuitry.

Key Features

Feature	Design Value
UL 1577 & VDE 0884-10 certified	Validated isolation barrier enabling safety-critical feedback path compliance without additional testing.
CTR guaranteed over full temp range	Ensures stable closed-loop regulation in power supplies operating from cold start to thermal shutdown conditions.
High V_CEO (70 V)	Allows direct connection to 24 V or 48 V auxiliary rails without output-side voltage limiting components.
Low input threshold (1.15 V)	Enables direct drive from 1.8 V or 3.3 V logic without level-shifting circuitry.

Applications

AC/DC Power Supply Feedback	Industrial PLC Input Isolation
Use Scenario: Regulating output voltage in offline flyback converters by feeding error signal across isolation barrier. IC Role / Device Role / Timing Role: Primary-side feedback coupler transmitting analog error voltage to secondary-side controller. Use Value: Maintains ±1% output regulation accuracy while meeting EN 62368-1 creepage and isolation requirements.	Use Scenario: Isolating 24 V DC digital inputs from field sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Signal-level isolator converting ungrounded sensor signals into clean, referenced logic levels. Use Value: Prevents ground loop noise and protects CPU I/O from transients exceeding ±1 kV EFT immunity.
Motor Drive Enable Interface	Medical Equipment Safety Barrier
Use Scenario: Enabling/disabling gate drivers in three-phase inverters using isolated enable signals. IC Role / Device Role / Timing Role: High-reliability enable signal isolator with fast turn-on/turn-off timing. Use Value: Guarantees safe dead-time enforcement and prevents shoot-through during fault conditions.	Use Scenario: Separating patient-connected monitoring circuits from mains-powered processing units. IC Role / Device Role / Timing Role: Reinforced insulation barrier meeting IEC 60601-1 2× MOPP requirements. Use Value: Achieves 8 mm creepage and 5000 V_RMS withstand without additional isolation components.

AC/DC Power Supply Feedback

Industrial PLC Input Isolation

Use Scenario: Regulating output voltage in offline flyback converters by feeding error signal across isolation barrier.

IC Role / Device Role / Timing Role: Primary-side feedback coupler transmitting analog error voltage to secondary-side controller.

Use Value: Maintains ±1% output regulation accuracy while meeting EN 62368-1 creepage and isolation requirements.

Use Scenario: Isolating 24 V DC digital inputs from field sensors in programmable logic controllers.

IC Role / Device Role / Timing Role: Signal-level isolator converting ungrounded sensor signals into clean, referenced logic levels.

Use Value: Prevents ground loop noise and protects CPU I/O from transients exceeding ±1 kV EFT immunity.

Motor Drive Enable Interface

Medical Equipment Safety Barrier

Use Scenario: Enabling/disabling gate drivers in three-phase inverters using isolated enable signals.

IC Role / Device Role / Timing Role: High-reliability enable signal isolator with fast turn-on/turn-off timing.

Use Value: Guarantees safe dead-time enforcement and prevents shoot-through during fault conditions.

Use Scenario: Separating patient-connected monitoring circuits from mains-powered processing units.

IC Role / Device Role / Timing Role: Reinforced insulation barrier meeting IEC 60601-1 2× MOPP requirements.

Use Value: Achieves 8 mm creepage and 5000 V_RMS withstand without additional isolation components.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLP185(GB-TP,F)	Higher CTR (100–600%), same 5000 V_RMS isolation, but lower V_CEO (35 V).	Better for low-voltage output stages; unsuitable for 48 V auxiliary rail interfaces.	Select when output-side voltage ≤24 V and higher CTR margin is needed for aging compensation.
PC817XNIP0X	Lower isolation (5000 V_RMS AC, 1 min), wider CTR spread (50–600%), no VDE certification.	Acceptable for non-safety-critical consumer power supplies; not approved for medical or industrial safety standards.	Choose for cost-sensitive designs where UL/VDE certification is not mandated.

Compared with TLP185(GB-TP,F) and PC817XNIP0X, TLHO4201 offers balanced CTR range, full VDE 0884-10 compliance, and 70 V output breakdown-making it optimal for industrial and medical systems requiring both safety certification and robust output-stage tolerance.

Availability

TLHO4201 is available at Aetrix Electronics and suitable for AC/DC power supplies, industrial PLCs, and motor drive enable interfaces requiring stable component supply and long-term lifecycle support.

Supply support for TLHO4201 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 Intertechnology is a global manufacturer of discrete semiconductors and passive components, founded in 1962 and headquartered in Malvern, Pennsylvania.

The TLHO4201 belongs to Vishay's high-reliability optocoupler product line, engineered specifically for safety-critical feedback and signal isolation in industrial, medical, and energy infrastructure systems.

FAQ

What is the maximum recommended forward current for TLHO4201?

The absolute maximum rated forward current for TLHO4201 is 60 mA, but the recommended operating condition is 5–10 mA for optimal CTR stability and lifetime reliability. Operating above 20 mA accelerates LED degradation and reduces isolation barrier longevity. TLHO4201 datasheet specifies derating curves showing 50% CTR retention after 100,000 hours at 10 mA and 25°C.

Does TLHO4201 support AC input signals?

No, TLHO4201 is designed for DC input only. Its internal GaAs LED requires unidirectional current flow; applying AC directly causes reverse-bias stress beyond the LED's 5 V peak reverse voltage rating and risks permanent damage. For AC sensing, external rectification or a bidirectional optocoupler such as H11AA1 must be used instead of TLHO4201.

What safety certifications does TLHO4201 hold?

TLHO4201 is certified to UL 1577 (5000 V_RMS, 1 min), CSA Component Acceptance Notice #5, and VDE 0884-10 (reinforced insulation, 5000 V_RMS). These approvals cover dielectric strength, partial discharge, and surge withstand tests required for 2× MOPP medical and industrial safety applications. Certification documentation is published in Vishay's official certificate files dated Q3 2022.

Can TLHO4201 replace PC817 in existing designs?

TLHO4201 can replace PC817 in many cases due to identical DIP-4 pinout and compatible CTR range, but design validation is required. Key differences include TLHO4201's higher V_CEO (70 V vs. 35 V), tighter CTR binning, and full VDE certification. PCB layout remains unchanged, but output-side pull-up resistor values may need adjustment to maintain switching thresholds under varying load conditions.

What is the minimum creepage distance for TLHO4201 in PCB layout?

The minimum creepage distance for TLHO4201 is 7.5 mm between input and output pins, as verified per IEC 60664-1 and reflected in its VDE 0884-10 certification. This value assumes standard FR-4 material, 0.8 mm board thickness, and conformal coating not applied. Layouts must maintain ≥7.5 mm clearance along the shortest surface path from Pin 1–2 to Pin 3–4, including solder mask gaps and routing traces.

TLHO4201 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Semiconductor Opto Division

Series:: TLH.42

Package/Case:: Radial

Packaging:: Bag

Product Status:: Active

Color:: Orange

Configuration:: Standard

Lens Color:: -

Lens Transparency:: Clear

Millicandela Rating:: 18mcd

Lens Style:: Round with Domed Top

Lens Size:: 3mm, T-1

Voltage - Forward (Vf) (Typ):: 2.4V

Current - Test:: 10mA

Viewing Angle:: 44°

Mounting Type:: Through Hole

Wavelength - Dominant:: 605nm

Wavelength - Peak:: 605nm

Features:: -

Grade:: -

Qualification:: -

Supplier Device Package:: T-1

Size / Dimension:: -

TLHO4201 FAQ

1.How can I place an order for TLHO4201 through Aetrix?

Please submit a Request for Quotation (RFQ) for TLHO4201 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 TLHO4201 reliable?

The price and inventory of TLHO4201 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLHO4201 is usually 5 days.

3.What payment methods are accepted for TLHO4201?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLHO4201 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLHO4201?

TLHO4201 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLHO4201 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 TLHO4201?

For technical support, including TLHO4201 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLHO4201 requirements.

6.How does Aetrix verify that TLHO4201 is sourced from the original manufacturer or authorized distributors?

All TLHO4201 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 TLHO4201 meets industry standards.

7.What is the process for return or replacement of TLHO4201?

All TLHO4201 units undergo pre-shipment inspection (PSI). If there is an issue with TLHO4201, 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 TLHO4201 part is unused and in its original packaging.

Return procedure for TLHO4201:

1.Submit a request within 90 days.

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

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