SPM10040T-2R2M-HZ Equivalent & Substitute Parts

Part Overview

The SPM10040T-2R2M-HZ is a 2.2 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 16.7 A continuous current with a maximum DC resistance of 7.46 mOhm. This component is classified as not for new designs, indicating it has been superseded in TDK's product portfolio. Finding equivalent substitute parts is necessary for applications requiring continued supply, design updates, or inventory replenishment where the original part is no longer actively produced.

Substiute Parts

SPM10040T-2R2M-HZ

TDK CorporationIn Stock: 1591SPM10040T-2R2M-HZ Datasheet

Current PartRFQ

SPM10040T-2R2M-HZR

TDK CorporationIn Stock: 2100SPM10040T-2R2M-HZR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPM10040T-2R2M-HZ is determined by the following critical parameters:

• Inductance value: 2.2 µH (±20% tolerance)
• Current rating: minimum 16.7 A continuous
• DC resistance: maximum 7.46 mOhm
• Shielding: shielded configuration required
• Core material: metal core
• Mounting: surface mount
• Package dimensions: 10.70mm x 10.00mm x 4.00mm
• Operating temperature: -40°C ~ 125°C
• Compliance: AEC-Q200 rated

The SPM10040T-2R2M-HZR qualifies as a manufacturer-recommended substitute. While it exhibits a lower continuous current rating (13.1 A versus 16.7 A), it maintains the same inductance value, comparable DC resistance, identical physical dimensions, and equivalent environmental specifications. The higher saturation current (12.8 A) of the substitute part provides improved performance margin in saturation-limited applications.

Parameter Comparison

Engineering Selection Recommendations

The SPM10040T-2R2M-HZR is the manufacturer-recommended substitute for the SPM10040T-2R2M-HZ. Selection between these parts should be based on the following criteria:

Use SPM10040T-2R2M-HZ when existing inventory is available and current design specifications explicitly require the 16.7 A continuous current rating with 9.7 A saturation current characteristics.

Use SPM10040T-2R2M-HZR for new designs, ongoing production, or inventory replenishment. This part carries active product status from TDK Corporation, ensuring long-term availability and supply chain continuity. The substitute maintains identical inductance, physical dimensions, and operating temperature range. Both parts meet AEC-Q200 automotive qualification and ROHS3 compliance requirements.

The trade-off between parts involves current rating and saturation performance. The SPM10040T-2R2M-HZR provides 3.6 A lower continuous current capacity but delivers 3.1 A higher saturation current, making it suitable for applications where saturation margin is prioritized over maximum continuous current handling.

Frequently Asked Questions (FAQ)

Q: Can SPM10040T-2R2M-HZR directly replace SPM10040T-2R2M-HZ in existing designs?

A: Direct replacement is possible if the application current requirement does not exceed 13.1 A continuous. The substitute maintains identical inductance value, tolerance, physical dimensions, and operating temperature range. Verify that your circuit design operates within the 13.1 A continuous current limit of the substitute part.

Q: What is the difference in DC resistance between these parts?

A: The SPM10040T-2R2M-HZ has a maximum DC resistance of 7.46 mOhm, while the SPM10040T-2R2M-HZR has a maximum of 7.92 mOhm. This 0.46 mOhm difference represents approximately 6.2% higher resistance in the substitute part and should be evaluated in power dissipation calculations for high-current applications.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the SPM10040T-2R2M-HZ and SPM10040T-2R2M-HZR carry AEC-Q200 ratings, indicating automotive-grade qualification. Both are ROHS3 compliant and have MSL 1 (unlimited moisture sensitivity level).

Q: Why is the original part marked "Not For New Designs"?

A: The SPM10040T-2R2M-HZ has been superseded by the SPM10040T-2R2M-HZR in TDK's product portfolio. New designs should utilize the active substitute part to ensure long-term supply availability and manufacturer support.

Q: Do these parts have identical physical dimensions?

A: Yes. Both parts share identical package dimensions of 10.70mm length x 10.00mm width x 4.00mm height (seated), allowing direct PCB footprint compatibility.

Q: What is the saturation current difference, and why does it matter?

A: The SPM10040T-2R2M-HZ has a saturation current of 9.7 A, while the SPM10040T-2R2M-HZR has 12.8 A. Higher saturation current provides greater margin before the inductor enters saturation, which is critical in switching power supply and current-limiting applications where inductance collapse must be avoided.