H11B1 Optoisolator Equivalent & Substitute Parts

Part Overview

The H11B1 is a Darlington optoisolator manufactured by onsemi, designed for high-voltage isolation applications requiring 5300Vrms isolation rating. This component features a single channel with Darlington output configuration and base connection, housed in a 6-DIP through-hole package. The H11B1 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.

Substiute Parts

H11B1

onsemiIn Stock: 36112H11B1 Datasheet

Current PartRFQ

H11B1M

onsemiIn Stock: 12380H11B1M Datasheet

SimilarRFQ

H11B1

onsemiIn Stock: 36112H11B1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the H11B1 is determined by the following critical parameters:

• Package compatibility: 6-DIP (0.300", 7.62mm) form factor for direct board-level replacement
• Output configuration: Darlington with Base topology for functional equivalence
• Number of channels: Single channel operation
• Input type: DC input requirement
• Isolation voltage: Minimum 4170Vrms to maintain system safety margins
• Current transfer ratio: Minimum 500% @ 1mA for consistent switching performance
• Turn-on/turn-off timing: 25µs and 18µs respectively for signal integrity
• Mounting type: Through-hole technology for PCB integration

The H11B1M qualifies as a functional substitute based on these parameters, despite variations in maximum isolation voltage and output current specifications.

Parameter Comparison

Engineering Selection Recommendations

The H11B1M is the primary substitute for the obsolete H11B1. Selection between these parts depends on application-specific requirements:

H11B1M advantages: Active product status ensures ongoing availability and supply chain continuity. RoHS3 compliance and REACH unaffected status provide regulatory alignment for new designs. Higher maximum output voltage (30V) and specified output current (150mA) offer expanded application flexibility.

H11B1 considerations: Higher isolation voltage rating (5300Vrms versus 4170Vrms) may be required for applications with stringent isolation requirements. Lower operating temperature minimum (-55°C versus -40°C) supports extended temperature range applications.

Both parts share identical current transfer ratio, switching timing, saturation voltage, and forward voltage characteristics, ensuring functional compatibility in most circuit topologies. Package and mounting configurations are identical, enabling direct PCB-level substitution.

Frequently Asked Questions (FAQ)

Q: Can H11B1M directly replace H11B1 in existing designs?

A: Yes, for applications where the 4170Vrms isolation voltage of H11B1M meets system requirements. Both parts feature identical 6-DIP packaging, single-channel Darlington output configuration, 500% current transfer ratio, and 25µs/18µs switching timing. Verify that your circuit isolation voltage requirement does not exceed 4170Vrms.

Q: What is the primary difference between H11B1 and H11B1M?

A: The H11B1M has a lower isolation voltage rating (4170Vrms versus 5300Vrms) but offers higher maximum output voltage (30V versus 25V) and specified output current capability (150mA). H11B1M is active production status while H11B1 is obsolete.

Q: Are there packaging differences between these parts?

A: Both H11B1 and H11B1M use identical 6-DIP (0.300", 7.62mm) through-hole packages. H11B1M is supplied in tube packaging, while H11B1 packaging is not specified. Pin configuration and board-level footprint are identical.

Q: Which part should be selected for new designs?

A: H11B1M is the appropriate choice for new designs due to active product status, RoHS3 compliance, and ongoing manufacturer support. Use H11B1 only if your application specifically requires the 5300Vrms isolation rating and can accommodate the narrower operating temperature range (-40°C minimum for H11B1M versus -55°C for H11B1).

Q: Do these parts have identical electrical performance?

A: Both parts share identical current transfer ratio (500% @ 1mA), forward voltage (1.2V typical), saturation voltage (1V maximum), and switching timing (25µs on, 18µs off). Output voltage and current specifications differ, with H11B1M offering higher ratings in both parameters.