PS9115-A Equivalent & Substitute Parts

Part Overview

The PS9115-A is a logic output optoisolator manufactured by CEL, featuring 3.75kV isolation voltage with push-pull totem pole output configuration. This component is currently designated as obsolete, making identification of functionally equivalent substitutes essential for design continuity and system maintenance. The VO0611T from Vishay Semiconductor Opto Division provides comparable isolation and data rate performance while offering improved availability as an active product.

Substiute Parts

PS9115-A

CELIn Stock: 962PS9115-A Datasheet

Current PartRFQ

VO0611T

Vishay Semiconductor Opto DivisionIn Stock: 31508VO0611T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution between the PS9115-A and VO0611T is evaluated based on the following critical parameters:

• Isolation Voltage: Both devices exceed 3.75kV minimum requirement (PS9115-A: 3750Vrms; VO0611T: 4000Vrms)
• Data Rate Compatibility: Both support 10Mbps/10MBd operation
• Supply Voltage: Both operate within 4.5V–5.5V range
• Number of Channels: Both provide single-channel isolation
• Input Type: Both accept DC input signals
• Mounting Type: Both are surface-mount devices
• CMTI Performance: VO0611T exceeds minimum CMTI with 15kV/µs versus PS9115-A's 10kV/µs
• Operating Temperature: VO0611T supports extended range (-40°C to 100°C) versus PS9115-A (-40°C to 85°C)

The primary design consideration is output configuration: PS9115-A provides push-pull totem pole output, while VO0611T features open-drain output. This difference requires circuit evaluation to determine design compatibility.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The PS9115-A is designated obsolete, creating supply chain risk. The VO0611T is an active product with significant inventory availability (31,400 pcs), ensuring continued sourcing for future production and maintenance requirements.

Compliance Status: The VO0611T is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The PS9115-A is REACH affected, which may impact procurement and use in certain jurisdictions.

Circuit Compatibility: Selection between these optoisolators depends on output stage requirements. The push-pull totem pole output of the PS9115-A is directly compatible with TTL/CMOS logic inputs without external pull-up resistors. The open-drain configuration of the VO0611T requires external pull-up resistor implementation and is suitable for multi-master or wired-OR applications.

Performance Parameters: Both devices meet the core isolation and data rate requirements. The VO0611T offers superior CMTI performance (15kV/µs) and extended operating temperature range (-40°C to 100°C). The PS9115-A maintains faster propagation delay (65ns versus 100ns), which may be critical in time-sensitive applications.

Package Consideration: The 6-SOIC package of PS9115-A differs from the 8-SOIC package of VO0611T, requiring PCB layout redesign for substitution. Pin-to-pin compatibility does not exist.

Frequently Asked Questions (FAQ)

Q: Can VO0611T directly replace PS9115-A without circuit modification?

A: Pin-to-pin direct replacement is not possible due to different package configurations (6-SOIC vs. 8-SOIC). Additionally, the output type difference (push-pull versus open-drain) requires circuit evaluation. Open-drain output typically requires external pull-up resistor sizing based on load capacitance and switching frequency to maintain signal integrity and timing specifications.

Q: What are the primary electrical differences affecting substitution?

A: The critical differences are output configuration type and output current capability. The PS9115-A push-pull output drives 13 mA directly to logic levels. The VO0611T open-drain output drives 50 mA through an external pull-up resistor. Propagation delay also differs (PS9115-A: 65ns; VO0611T: 100ns), which requires timing analysis in applications with strict delay specifications.

Q: Does VO0611T provide equivalent isolation performance?

A: Yes. The VO0611T isolation voltage (4000Vrms) exceeds the PS9115-A requirement (3750Vrms), and both support equivalent data rates (10Mbps/10MBd). The VO0611T CMTI specification (15kV/µs) exceeds the PS9115-A (10kV/µs), providing improved common-mode transient immunity.

Q: Are there compliance or availability advantages to VO0611T?

A: Yes. The VO0611T is an active product with 31,400 units in stock, whereas the PS9115-A is obsolete. The VO0611T is ROHS3 compliant and REACH unaffected, meeting current environmental standards. The PS9115-A is REACH affected, which impacts availability in certain regulated markets.

Q: What temperature range differences exist?

A: The PS9115-A operates -40°C to 85°C. The VO0611T operates -40°C to 100°C, providing a 15°C extended upper limit. This extended range may be advantageous for industrial or automotive applications requiring higher temperature operation.