H11A1SD Optoisolator Equivalent & Substitute Parts

Part Overview

The H11A1SD is a single-channel optoisolator transistor with base output manufactured by onsemi, rated for 5300Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The H11A1SD operates as a DC-input optoisolator with transistor output, suitable for applications requiring galvanic isolation in surface-mount configurations.

Substiute Parts

H11A1SD

onsemiIn Stock: 1083H11A1SD Datasheet

Current PartRFQ

H11A1SR2M

onsemiIn Stock: 28875H11A1SR2M Datasheet

DirectRFQ

H11A1SM

onsemiIn Stock: 2146H11A1SM Datasheet

SimilarRFQ

H11A1SMT&R

Isocom Components 2004 LTDIn Stock: 809H11A1SMT&R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the H11A1SD is determined by the following critical parameters:

• Number of Channels: Must be 1 channel
• Output Type: Must be Transistor with Base
• Package / Case: Must be 6-SMD, Gull Wing
• Mounting Type: Must be Surface Mount
• Voltage - Output (Max): Must be 30V
• Vce Saturation (Max): Must be 400mV
• Current Transfer Ratio (Min): Must be 50% @ 10mA
• Input Type: Must be DC

Substitute parts are grouped into two categories:

Direct Substitutes (onsemi H11A1 Series): H11A1SR2M and H11A1SM maintain identical electrical characteristics and package specifications as the H11A1SD, with the primary difference being isolation voltage rating (4170Vrms versus 5300Vrms). These parts are active products with current manufacturing status.

Similar Substitute (Cross-Manufacturer): H11A1SMT&R from Isocom Components 2004 LTD shares the same base product number (H11A series), package configuration, and core functional parameters, though with different isolation voltage specification (7.5Vpk).

Parameter Comparison

Engineering Selection Recommendations

H11A1SR2M and H11A1SM are the primary substitutes for the H11A1SD. Both are active onsemi products with ROHS3 compliance, addressing the obsolescence of the main part. The H11A1SR2M is supplied in Tape & Reel packaging, while H11A1SM is supplied in Tube packaging. Selection between these two depends on procurement and assembly requirements.

The H11A1SR2M and H11A1SM feature a reduced isolation voltage rating of 4170Vrms compared to the H11A1SD's 5300Vrms. This reduction is acceptable for applications where the lower isolation voltage meets system requirements. Both parts maintain identical current transfer ratio, output voltage, saturation voltage, and switching time specifications.

The H11A1SR2M and H11A1SM operate over a narrower temperature range (-40°C ~ 100°C) compared to the H11A1SD (-55°C ~ 100°C). Applications requiring operation below -40°C must retain the H11A1SD or evaluate the H11A1SMT&R.

H11A1SMT&R from Isocom Components 2004 LTD is a cross-manufacturer substitute within the H11A series. This part maintains the full operating temperature range (-55°C ~ 100°C) and shares identical package configuration. However, the isolation voltage specification differs significantly (7.5Vpk versus 5300Vrms), making this part suitable only for applications with lower isolation voltage requirements. The H11A1SMT&R is ROHS3 compliant and supplied in Tape & Reel packaging.

All substitute parts maintain the same 6-SMD Gull Wing package configuration, enabling direct board-level replacement without layout modifications. All parts carry MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can H11A1SR2M or H11A1SM directly replace H11A1SD without circuit modification?

A: H11A1SR2M and H11A1SM are pin-compatible and functionally equivalent for applications where 4170Vrms isolation voltage is sufficient. The reduced isolation voltage is the primary design consideration. No circuit modification is required if isolation voltage requirements are met.

Q: What is the key difference between H11A1SR2M and H11A1SM?

A: Both parts are electrically identical onsemi H11A1 optoisolators with 4170Vrms isolation. The difference is packaging format: H11A1SR2M is supplied in Tape & Reel (TR), while H11A1SM is supplied in Tube. Selection depends on assembly process requirements and procurement preferences.

Q: Is H11A1SMT&R suitable as a substitute for the H11A1SD?

A: H11A1SMT&R shares the same base product series (H11A) and package configuration but has a significantly different isolation voltage specification (7.5Vpk). This part is suitable only for applications with lower isolation voltage requirements. For applications requiring 5300Vrms isolation, H11A1SMT&R is not appropriate.

Q: What is the operating temperature difference between substitutes?

A: H11A1SR2M and H11A1SM operate from -40°C to 100°C, while H11A1SD and H11A1SMT&R operate from -55°C to 100°C. Applications requiring operation below -40°C must use H11A1SMT&R or retain the H11A1SD.

Q: Are all substitute parts RoHS compliant?

A: H11A1SR2M, H11A1SM, and H11A1SMT&R are all ROHS3 compliant. The original H11A1SD does not specify RoHS status. All parts carry REACH Unaffected status.

Q: What is the current-carrying capacity difference?

A: H11A1SD supports 100 mA maximum DC forward current, while H11A1SR2M, H11A1SM, and H11A1SMT&R support 60 mA maximum. Applications requiring higher forward current must retain the H11A1SD or verify that 60 mA is sufficient for the design.