TIL191 Equivalent & Substitute Parts

Part Overview

The TIL191 is an optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This single-channel device provides galvanic isolation with a 7.5Vpk isolation voltage rating and is housed in a 4-DIP through-hole package. The component is currently active in production with 8915 units in stock. Alternative models may be required when higher isolation voltage ratings, improved switching characteristics, or extended input type compatibility are necessary for specific application requirements.

Substiute Parts

TIL191

Isocom Components 2004 LTDIn Stock: 8961TIL191 Datasheet

Current PartRFQ

ISP814X

Isocom Components 2004 LTDIn Stock: 916ISP814X Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The ISP814X qualifies as a substitute for the TIL191 based on the following alignment of critical parameters:

Both devices share identical package specifications (4-DIP through-hole, 0.300" / 7.62mm), enabling direct mechanical compatibility on printed circuit boards. Both maintain the same output type (transistor), maximum output voltage (35V), forward voltage (1.2V typical), and maximum forward current (50 mA). Both are manufactured by Isocom Components 2004 LTD and maintain ROHS3 compliance and unlimited moisture sensitivity rating.

The ISP814X provides enhanced isolation voltage (5300Vrms versus 7.5Vpk), improved switching performance (4µs and 3µs rise/fall times versus 6µs), lower saturation voltage (200mV versus 400mV), and broader input type support (AC and DC versus DC only). The ISP814X operates across a narrower temperature range (-30°C to 100°C versus -55°C to 100°C).

Parameter Comparison

Engineering Selection Recommendations

Both the TIL191 and ISP814X are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance for current applications. The ISP814X is suitable for applications requiring higher isolation voltage specifications or improved switching speed. The TIL191 remains appropriate for applications with lower isolation voltage requirements and extended low-temperature operation down to -55°C. Both devices support through-hole PCB assembly without modification to existing board layouts.

Frequently Asked Questions (FAQ)

Q: Can the ISP814X directly replace the TIL191 in existing designs?

A: Yes, mechanical and electrical compatibility is maintained. Both devices use identical 4-DIP through-hole packaging. The ISP814X provides superior isolation voltage and faster switching characteristics. Verify that the application does not require operation below -30°C, as the ISP814X minimum operating temperature is -30°C compared to the TIL191's -55°C.

Q: What are the key differences between these optoisolators?

A: The ISP814X provides 5300Vrms isolation versus the TIL191's 7.5Vpk isolation. The ISP814X offers faster switching (4µs/3µs rise/fall times versus 6µs/6µs) and lower saturation voltage (200mV versus 400mV). The ISP814X accepts both AC and DC input signals, while the TIL191 accepts DC input only.

Q: Are there any compliance or certification differences?

A: Both devices maintain identical compliance status: ROHS3 compliant, REACH unaffected, EAR99 classification, and unlimited moisture sensitivity rating (MSL 1).

Q: Which device should be selected for new designs?

A: Selection depends on specific application requirements. Choose the ISP814X for applications requiring higher isolation voltage or faster switching performance. Choose the TIL191 for applications requiring extended low-temperature operation or when lower isolation voltage is sufficient.