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Home > Products > Sensors, Transducers > Optical Sensors > Photo Detectors - Remote Receiver

Vishay Semiconductor Opto Division TSOP77438TR

Name: TSOP77438TR
Brand: Vishay Semiconductor Opto Division
SKU: TSOP77438TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSOP77438TR

Manufacturer:: Vishay Semiconductor Opto Division

Category:: Photo Detectors - Remote Receiver

Package:

Datasheet:: TSOP77438TR.pdf

Description:: SENSOR REMOTE REC 38.0KHZ 40M

Quantity:: RFQ Add To RFQ list

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Inventory:7,210

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Product details

Overview

TSOP77438TR from Vishay Semiconductors is a surface-mount infrared (IR) receiver module optimized for long-burst remote control systems operating at 38 kHz carrier frequency, featuring AGC4 configuration for enhanced noise immunity against fluorescent lamps, LCD TVs, and Wi-Fi interference, with supply voltage range of 2.0–5.5 V and typical supply current of 0.35 mA at 3.3 V.

For engineers reviewing the TSOP77438TR datasheet, TSOP77438TR pinout, TSOP77438TR application, or TSOP77438TR equivalent, this device is selected for NEC, Sharp, and Mitsubishi IR protocols in consumer electronics remote receivers where ambient light rejection and burst-length tolerance are critical design requirements.

Technical Context

The TSOP77438TR integrates a PIN photodiode and preamplifier in a single epoxy package with built-in IR bandpass filter centered at 950 nm and tuned to 38 kHz. Its AGC4 architecture dynamically suppresses spurious output pulses by reducing sensitivity during strong ambient disturbance while maintaining reliable decoding of valid RC-5, NEC, and Sharp data bursts.

It supports minimum burst lengths of 10 cycles, requires ≥10-cycle gap times between bursts, and tolerates envelope duty cycles up to 100% for bursts >3× length - enabling robust operation with high-duty-cycle IR signals common in modern remote protocols.

Key Specifications

Parameter	Value and Actual Design Meaning
Carrier frequency	38 kHz - precisely matched to NEC, Sharp, and Mitsubishi remote control protocols.
Supply voltage	2.0 V to 5.5 V - compatible with 3.3 V and 5 V microcontroller I/O domains without level shifting.
Supply current (typ.)	0.35 mA at 3.3 V - enables low-power remote receiver designs with battery life extension.
Output logic	Active-low demodulated signal - directly interfaces standard GPIO pins on MCUs for software decoding.
Minimum irradiance (NEC)	0.3 mW/m² - ensures reliable detection under low-signal conditions such as oblique angles or distance.
Directivity angle	±50° horizontal - provides wide field-of-view for user-friendly remote pointing without precise alignment.
Operating temperature	−25 °C to +85 °C - suitable for indoor consumer electronics across global climate zones.

Pinout & Package

TSOP77438TR uses the Heimdall SMD package (6.8 mm × 3.0 mm × 3.2 mm) with gull-wing leads and integrated IR filter. The package is moisture-sensitive (J-STD-020 Level 4) and requires reflow within 72 hours of dry-pack opening or baking per specified conditions.

Pin/Terminal	Circuit Role	Design Meaning
1, 4	GND	Ground reference for analog front-end and digital output stage; both pins must be connected to PCB ground plane.
2	VS	Positive supply input (2.0–5.5 V); decoupling capacitor (e.g., 100 nF) recommended near pin.
3	OUT	Active-low demodulated output; drives MCU GPIO directly; open-collector compatible with pull-up resistor.

Key Features

Feature	Design Value
AGC4 configuration	Optimized for long-burst codes (e.g., NEC, Sharp), delivering superior suppression of complex fluorescent lamp disturbances (Fig. 15).
Integrated IR filter	Centered at 950 nm with ±50° directivity - rejects visible light and ambient IR while maximizing signal-to-noise ratio.
Noise immunity	Rejects 2.4 GHz/5 GHz Wi-Fi, LCD TV emissions, and continuous DC light sources without external filtering.
Low supply current	0.35 mA typical at 3.3 V - reduces system power budget and thermal load in compact enclosures.
Standard SMD footprint	Compatible with automated pick-and-place and reflow (JEDEC Level 4); 2300 pcs/reel side-taped packaging.

Applications

TV Remote Receiver	Set-Top Box IR Interface
Use Scenario: Consumer television remote control reception in living room environments with ambient LED/LCD lighting and Wi-Fi routers. IC Role / Device Role / Timing Role: Demodulates 38 kHz modulated IR commands (NEC protocol) into clean digital pulses for MCU decoding. Use Value: AGC4 ensures zero false triggers from fluorescent lamp flicker or 5 GHz Wi-Fi co-location, maintaining UI responsiveness.	Use Scenario: IR command reception in cable/satellite set-top boxes mounted behind glass cabinets with limited line-of-sight. IC Role / Device Role / Timing Role: Acts as the primary IR signal conditioner, converting weak/diffused IR bursts into TTL-compatible logic levels. Use Value: ±50° directivity and 0.3 mW/m² sensitivity enable reliable operation even when remote is pointed off-axis or at reduced power.
Audio System Remote Control	Smart Home Hub IR Gateway
Use Scenario: High-fidelity audio receiver remote interface exposed to variable ambient light including sunlight through windows. IC Role / Device Role / Timing Role: Front-end IR detector with automatic gain control that adapts to changing ambient irradiance levels. Use Value: Maintains consistent detection threshold across daylight-to-dimmed-room transitions without firmware calibration.	Use Scenario: Central IR hub aggregating commands from multiple remotes (NEC, Sharp, Mitsubishi) into unified IoT platform. IC Role / Device Role / Timing Role: Protocol-agnostic IR signal extractor feeding decoded data to host processor via GPIO interrupt. Use Value: Supports simultaneous compatibility with NEC (Mitsubishi), Sharp, and RC-5 variants - eliminating need for multiple receiver types.

TV Remote Receiver

Set-Top Box IR Interface

Use Scenario: Consumer television remote control reception in living room environments with ambient LED/LCD lighting and Wi-Fi routers.

IC Role / Device Role / Timing Role: Demodulates 38 kHz modulated IR commands (NEC protocol) into clean digital pulses for MCU decoding.

Use Value: AGC4 ensures zero false triggers from fluorescent lamp flicker or 5 GHz Wi-Fi co-location, maintaining UI responsiveness.

Use Scenario: IR command reception in cable/satellite set-top boxes mounted behind glass cabinets with limited line-of-sight.

IC Role / Device Role / Timing Role: Acts as the primary IR signal conditioner, converting weak/diffused IR bursts into TTL-compatible logic levels.

Use Value: ±50° directivity and 0.3 mW/m² sensitivity enable reliable operation even when remote is pointed off-axis or at reduced power.

Audio System Remote Control

Smart Home Hub IR Gateway

Use Scenario: High-fidelity audio receiver remote interface exposed to variable ambient light including sunlight through windows.

IC Role / Device Role / Timing Role: Front-end IR detector with automatic gain control that adapts to changing ambient irradiance levels.

Use Value: Maintains consistent detection threshold across daylight-to-dimmed-room transitions without firmware calibration.

Use Scenario: Central IR hub aggregating commands from multiple remotes (NEC, Sharp, Mitsubishi) into unified IoT platform.

IC Role / Device Role / Timing Role: Protocol-agnostic IR signal extractor feeding decoded data to host processor via GPIO interrupt.

Use Value: Supports simultaneous compatibility with NEC (Mitsubishi), Sharp, and RC-5 variants - eliminating need for multiple receiver types.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSOP77238TR	AGC2 variant with lower noise suppression but higher code compatibility for short-burst protocols.	Better suited for legacy RC-5 systems with tight timing constraints; less effective against complex fluorescent lamp noise.	Select TSOP77238TR only if target remote uses RC-5/RC-6 and operates in low-interference environments.
Vishay TSOP38238	Legacy TSOP382 series; no AGC, fixed gain, narrower bandwidth (±1.5 kHz), higher minimum irradiance (0.5 mW/m²).	Limited to basic NEC remotes in controlled lighting; lacks immunity to modern Wi-Fi/LCD TV interference.	Choose TSOP38238 only for cost-sensitive, low-complexity designs where ambient noise is negligible.

Compared with TSOP77438TR, TSOP77238TR offers broader protocol compatibility but reduced noise resilience, while TSOP38238 provides lower BOM cost at the expense of robustness in real-world lighting conditions - making TSOP77438TR the optimal choice for next-generation consumer IR receivers requiring field-proven interference rejection.

Availability

TSOP77438TR is available at Aetrix Electronics and suitable for TV remote receivers, set-top box IR interfaces, audio system controls, and smart home hub gateways requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for TSOP77438TR 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 management, and sensing solutions for industrial and consumer markets.

The TSOP774xx series was developed specifically for long-burst infrared remote control systems in noisy electromagnetic environments, targeting robust performance across NEC, Sharp, and Mitsubishi protocols without firmware compensation.

FAQ

What is the carrier frequency supported by TSOP77438TR?

The TSOP77438TR is factory-tuned to 38 kHz carrier frequency, matching industry-standard NEC, Sharp, and Mitsubishi infrared remote control protocols. This exact center frequency enables optimal signal-to-noise ratio and reliable demodulation of encoded bursts without external tuning components. The device's bandpass filter has a 3 dB bandwidth of ±3.8 kHz (f₀/10), ensuring precise rejection of adjacent frequencies like 36 kHz or 40 kHz interference.

Does TSOP77438TR require external components for basic operation?

No, TSOP77438TR operates autonomously with only a 100 nF ceramic decoupling capacitor between VS and GND. Its integrated PIN diode, preamplifier, AGC circuit, and bandpass filter eliminate the need for external op-amps, comparators, or timing resistors. The active-low OUT pin connects directly to a microcontroller GPIO, and no pull-up resistor is mandatory - though a 10 kΩ pull-up is recommended for noise margin in electrically noisy layouts.

How does TSOP77438TR handle ambient light interference?

TSOP77438TR uses dual-stage ambient rejection: an epoxy-integrated optical filter blocks visible light and passes only ~950 nm IR, while its AGC4 circuit dynamically attenuates gain during strong ambient IR bursts (e.g., from fluorescent lamps or LCD TVs). This combination achieves >30 dB suppression of 2.4 GHz/5 GHz Wi-Fi harmonics and eliminates false triggering from sunlight or tungsten bulb DC irradiance up to 40 klx.

What is the maximum transmission distance achievable with TSOP77438TR?

Under dark ambient conditions using a TSAL6200 IR emitter at 50 mA drive current and standard NEC test signal, TSOP77438TR achieves a typical transmission distance of 18 meters. Real-world range depends on emitter power, lens quality, and ambient IR noise - but the device maintains reliable detection down to 0.3 mW/m² irradiance, supporting operation at 5–10 meters in typical living room environments with mixed lighting.

Is TSOP77438TR qualified for automotive applications?

No, TSOP77438TR is not qualified to AEC-Q200 or automotive-grade reliability standards. It is rated for −25 °C to +85 °C operating temperature and intended exclusively for consumer electronics and industrial remote control systems. Vishay explicitly states these components "have not been qualified to automotive specifications," and automotive designs require dedicated AEC-Q200-certified IR receivers with extended temperature and qualification testing.

TSOP77438TR Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Semiconductor Opto Division

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Sensing Distance:: 40m

B.P.F. Center Frequency:: 38.0kHz

Voltage - Supply:: 2.5 V ~ 5.5 V

Current - Supply:: 700 µA

Orientation:: Side or Top View

Mounting Type:: Surface Mount

Operating Temperature:: -25°C ~ 85°C

TSOP77438TR FAQ

1.How can I place an order for TSOP77438TR through Aetrix?

Please submit a Request for Quotation (RFQ) for TSOP77438TR 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 TSOP77438TR reliable?

The price and inventory of TSOP77438TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSOP77438TR is usually 5 days.

3.What payment methods are accepted for TSOP77438TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSOP77438TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSOP77438TR?

TSOP77438TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSOP77438TR 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 TSOP77438TR?

For technical support, including TSOP77438TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSOP77438TR requirements.

6.How does Aetrix verify that TSOP77438TR is sourced from the original manufacturer or authorized distributors?

All TSOP77438TR 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 TSOP77438TR meets industry standards.

7.What is the process for return or replacement of TSOP77438TR?

All TSOP77438TR units undergo pre-shipment inspection (PSI). If there is an issue with TSOP77438TR, 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 TSOP77438TR part is unused and in its original packaging.

Return procedure for TSOP77438TR:

1.Submit a request within 90 days.

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

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