LDA201 Equivalent & Substitute Parts

Part Overview

The LDA201 is an optoisolator with transistor output manufactured by IXYS Integrated Circuits Division. It provides 3750Vrms isolation across 2 channels in an 8-DIP package. The device is classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system support and new design implementations.

Substiute Parts

LDA201

IXYS Integrated Circuits DivisionIn Stock: 1284LDA201 Datasheet

Current PartRFQ

ILD5

Isocom Components 2004 LTDIn Stock: 1802ILD5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LDA201 requires evaluation against the following critical parameters:

Package Compatibility: Both the main part and substitute must use 8-DIP (0.300", 7.62mm) through-hole packaging to ensure direct board-level compatibility.

Isolation Voltage: The LDA201 provides 3750Vrms isolation. Substitute parts must maintain isolation voltage at or above this specification to preserve circuit safety margins.

Channel Configuration: The LDA201 integrates 2 channels. Single-channel alternatives may require design modification or parallel implementation.

Output Type: Transistor output configuration must be maintained for signal switching applications.

Current Transfer Ratio: The LDA201 operates at 33% minimum and 1000% maximum at 1mA input current. Substitute devices must support comparable CTR ranges at their specified input currents.

Temperature Range: Operating temperature must encompass the LDA201 range of -40°C to 85°C.

Compliance: RoHS3 compliance and EAR99 classification must be preserved.

Parameter Comparison

Engineering Selection Recommendations

The ILD5 shares identical 8-DIP packaging with the LDA201, enabling direct physical board compatibility. Both devices maintain ROHS3 compliance and EAR99 classification.

The ILD5 is classified as active product status, ensuring continued availability and supply chain support compared to the obsolete LDA201.

Key differences exist in electrical specifications. The ILD5 provides single-channel operation versus the LDA201's dual-channel configuration. The ILD5 isolation voltage of 7.5Vpk is substantially lower than the LDA201's 3750Vrms specification. The ILD5 supports higher maximum output voltage (70V versus 30V) and lower saturation voltage (400mV versus 500mV).

Selection of the ILD5 as a substitute requires verification that application isolation voltage requirements do not exceed 7.5Vpk and that single-channel operation is acceptable or can be accommodated through circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the ILD5 directly replace the LDA201 without circuit modification?

A: Physical package compatibility is confirmed (both 8-DIP). Electrical compatibility depends on application requirements. The ILD5 single-channel configuration differs from the LDA201 dual-channel design. The substantially lower isolation voltage (7.5Vpk versus 3750Vrms) requires verification against application safety specifications.

Q: What is the primary limitation of using ILD5 as a substitute?

A: Isolation voltage is the critical parameter. The ILD5 provides 7.5Vpk isolation, which is significantly lower than the LDA201's 3750Vrms specification. Applications requiring high-voltage isolation cannot use the ILD5 without redesign.

Q: Are both devices RoHS compliant?

A: Yes. Both the LDA201 and ILD5 are ROHS3 compliant and maintain EAR99 export classification.

Q: Does the ILD5 support the same input current range as the LDA201?

A: No. The LDA201 specifies current transfer ratio at 1mA input current, while the ILD5 specifies CTR at 10mA input current. Input circuit design must accommodate this difference.

Q: What is the temperature operating range difference?

A: The LDA201 operates from -40°C to 85°C. The ILD5 operates from -25°C to 100°C. The ILD5 provides extended high-temperature capability but reduced low-temperature performance.