PR39MF21NSZ Equivalent & Substitute Parts

Part Overview

The PR39MF21NSZ is a Solid State Relay (SSR) manufactured by Sharp Microelectronics, configured as a SPST-NO (Single Pole Single Throw - Normally Open) relay in an 8-DIP through-hole package. This component is designed for AC load switching applications with zero-cross detection, rated for 900 mA at 0–240 V output. The product is currently obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring compatible SSR functionality.

Substiute Parts

PR39MF21NSZ

Sharp MicroelectronicsIn Stock: 975PR39MF21NSZ Datasheet

Current PartRFQ

AQH2213

Panasonic Electric WorksIn Stock: 1494AQH2213 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PR39MF21NSZ is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A) to maintain identical switching topology
• Output Type: Must be AC with zero-cross detection for compatible load switching behavior
• Input Voltage: Must be 1.2 VDC or equivalent to ensure proper control signal compatibility
• Load Current Rating: Must be 900 mA to support the same maximum load capacity
• Package / Case: Must be 8-DIP (0.300", 7.62 mm) with 7 leads for direct PCB compatibility
• Mounting Type: Must be through-hole to match existing board design
• Termination Style: Must be PC pin for direct socket or solder compatibility

The AQH2213 manufactured by Panasonic Electric Works meets all substitution criteria. While the AQH2213 supports a higher maximum load voltage (0–600 V versus 0–240 V), this represents an enhancement that does not compromise compatibility in applications designed for the PR39MF21NSZ.

Parameter Comparison

Engineering Selection Recommendations

The AQH2213 is the direct functional equivalent for the obsolete PR39MF21NSZ. Selection should be based on the following factors:

Product Status: The PR39MF21NSZ is obsolete and no longer manufactured. The AQH2213 is actively produced by Panasonic Electric Works, ensuring long-term availability and supply chain continuity.

Compliance: The AQH2213 is ROHS3 compliant, meeting current environmental and regulatory standards. The PR39MF21NSZ is RoHS non-compliant. For new designs or systems requiring compliance certification, the AQH2213 is the appropriate choice.

Electrical Performance: Both relays are rated for identical load current (900 mA) and input voltage (1.2 VDC nominal). The AQH2213's higher maximum load voltage rating (600 V versus 240 V) provides additional operational margin without affecting compatibility in 240 V applications.

Physical Compatibility: Both components use identical 8-DIP packaging with PC pin termination, enabling direct substitution on existing PCBs without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the AQH2213 be used as a direct replacement for the PR39MF21NSZ without PCB modifications?

A: Yes. Both components share identical package geometry (8-DIP, 0.300" spacing, 7 leads) and PC pin termination. Direct substitution on existing PCBs is possible without layout changes.

Q: Why does the AQH2213 have a higher maximum load voltage (600 V) than the PR39MF21NSZ (240 V)?

A: The AQH2213 is rated for a broader range of AC load voltages. This higher rating does not affect compatibility in applications designed for 240 V operation. The relay will function correctly at or below its rated maximum voltage.

Q: Are the input control voltages compatible between these two relays?

A: Yes. The PR39MF21NSZ requires 1.2 VDC input, and the AQH2213 requires 1.21 VDC input. These values are equivalent for practical circuit design purposes and will operate with standard control signal sources.

Q: What is the significance of the zero-cross output type?

A: Zero-cross detection ensures the relay switches AC loads at the zero-voltage point of the AC waveform, minimizing electromagnetic interference and reducing stress on connected loads. Both the PR39MF21NSZ and AQH2213 incorporate this feature.

Q: Is the AQH2213 suitable for new product designs?

A: Yes. The AQH2213 is actively manufactured and ROHS3 compliant, making it appropriate for new designs requiring SPST-NO SSR functionality in 8-DIP through-hole packages with 900 mA load capacity.

Q: What is the difference between the PR39MF series and the AQ-H series?

A: These are separate product lines from different manufacturers. The PR39MF series (Sharp) is obsolete. The AQ-H series (Panasonic) is the current equivalent, offering the same electrical and mechanical specifications with active manufacturing support and modern compliance certifications.