DM3AT-SF-PEJ Equivalent & Substitute Parts

Part Overview

The DM3AT-SF-PEJ is a 10-position (8 + 2) microSD card connector manufactured by Hirose Electric Co Ltd, designed for surface mount, right-angle applications with push-push insertion and removal. This connector is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part features gold contact finish, switch functionality, and is suitable for secure digital memory card applications in compact form factors.

Key Parameters

Parameter	Value
Manufacturer Part Number	DM3AT-SF-PEJ
Manufacturer	Hirose Electric Co Ltd
Category	Memory Connectors
Card Type	Secure Digital - microSD™
Number of Positions	10 (8 + 2)
Mounting Type	Surface Mount, Right Angle
Insertion/Removal Method	Push In, Push Out
Contact Finish	Gold
Height Above Board	0.066" (1.68mm)
Features	Switch
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the DM3AT-SF-PEJ is based on the following critical parameters:

Primary Substitution Criteria:

Card Type: Secure Digital - microSD™
Mounting Type: Surface Mount, Right Angle
Insertion/Removal Method: Push In, Push Out (or equivalent ejection mechanism)
Contact Finish: Gold
Connector Type: Connector and Ejector
Moisture Sensitivity Level: 1 (Unlimited)

Grouping Strategy:

Group 1 - Direct Equivalent (Preferred): DM3AT-SF-PEJM5 maintains identical electrical and mechanical specifications with Active product status and improved availability.

Group 2 - Functional Equivalents with Position Variance: 0473521001 and SDHL-8BNS-K-363-A0-ETB(HF) provide 8-position configurations instead of 10-position. These are suitable where the application does not require the full 10-position contact array.

Group 3 - Functional Equivalent with Mounting Variation: 5027740891 maintains 10-position configuration but features reverse-bottom mounting orientation instead of standard-top mounting.

Group 4 - Alternative Ejection Mechanism: ST1W008S4ER1500 uses hinged-lid insertion/removal instead of push-push, with 8-position configuration.

Parameter Comparison

Parameter	DM3AT-SF-PEJ	DM3AT-SF-PEJM5	0473521001	5027740891	SDHL-8BNS-K-363-A0-ETB(HF)	ST1W008S4ER1500
Manufacturer	Hirose	Hirose	Molex	Molex	JST Sales America Inc.	JAE Electronics
Number of Positions	10 (8 + 2)	10 (8 + 2)	8 (6 + 2)	10 (8 + 2)	8	8
Card Type	microSD™	microSD™	microSD™	microSD™	microSD™	microSD™
Mounting Type	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle
Insertion/Removal	Push In, Push Out	Push In, Push Out	Push In, Push Out	Push In, Push Out	Push In, Push Out	Hinged Lid
Contact Finish	Gold	Gold	Gold	Gold	Gold	Gold
Height Above Board	0.066" (1.68mm)	0.066" (1.68mm)	0.074" (1.88mm)	0.071" (1.80mm)	0.055" (1.40mm)	0.079" (2.00mm)
Mounting Feature	Normal, Standard - Top	Normal, Standard - Top	Normal, Standard - Top	Reverse - Bottom	Normal, Standard - Top	Normal, Standard - Top
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Not Specified	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable	1 (Unlimited)

Engineering Selection Recommendations

First Choice - DM3AT-SF-PEJM5: This Hirose part is the direct equivalent with identical electrical and mechanical specifications. Active product status ensures long-term availability and supply chain stability. RoHS compliance and standard packaging (Cut Tape & Digi-Reel®) support modern manufacturing processes. Inventory of 50,300 units provides supply security.

Second Choice - 5027740891: This Molex part maintains the critical 10-position configuration and push-push ejection mechanism. ROHS3 compliance and Active status support current design standards. The reverse-bottom mounting feature requires PCB layout modification but is electrically and functionally equivalent. Extensive inventory (360,406 units) ensures availability.

Third Choice - 0473521001: This Molex alternative is suitable for applications where 8-position contact configuration is acceptable. Active status and ROHS3 compliance are present. Height variance (0.074" vs. 0.066") requires mechanical clearance verification. Use only when position count reduction is acceptable.

Fourth Choice - SDHL-8BNS-K-363-A0-ETB(HF): This JST part offers the lowest profile (0.055") among substitutes, beneficial for space-constrained designs. 8-position configuration and RoHS compliance are provided. MSL classification differs (Not Applicable vs. 1), which may affect storage and handling procedures.

Fifth Choice - ST1W008S4ER1500: This JAE part uses hinged-lid insertion instead of push-push mechanism, requiring user interface redesign. 8-position configuration and ROHS3 compliance are present. Use only when hinged-lid operation is functionally acceptable and preferred.

Frequently Asked Questions (FAQ)

Q: Can DM3AT-SF-PEJM5 be used as a direct replacement for DM3AT-SF-PEJ?

A: Yes. DM3AT-SF-PEJM5 is a direct equivalent with identical position count (10), mounting type (surface mount right angle), insertion method (push-push), contact finish (gold), and height above board (0.066"). The primary difference is Active product status versus Obsolete, making it the preferred substitute.

Q: What is the impact of using an 8-position connector instead of 10-position?

A: The 8-position variants (0473521001, SDHL-8BNS-K-363-A0-ETB(HF), ST1W008S4ER1500) reduce the contact array from 10 to 8 positions. This is acceptable only if the application design does not require all 10 contact positions. Verify microSD card compatibility and signal integrity requirements before selection.

Q: Does the reverse-bottom mounting of 5027740891 affect electrical performance?

A: No. Reverse-bottom mounting (5027740891) versus standard-top mounting affects only PCB layout orientation and mechanical clearance. Electrical performance and contact integrity remain equivalent. PCB design must accommodate the reversed mounting feature.

Q: What is the height difference impact among substitute parts?

A: Height variations range from 0.055" (SDHL-8BNS-K-363-A0-ETB(HF)) to 0.079" (ST1W008S4ER1500) compared to the original 0.066". Verify mechanical clearance in the application enclosure. Low-profile options (SDHL series) are suitable for compact designs; taller options may require clearance verification.

Q: Are all substitutes RoHS compliant?

A: All substitute parts listed are RoHS or ROHS3 compliant. The original DM3AT-SF-PEJ does not specify RoHS status. For applications requiring RoHS compliance, all listed substitutes meet current regulatory requirements.

Q: What is the difference between push-push and hinged-lid insertion methods?

A: Push-push (DM3AT-SF-PEJ, DM3AT-SF-PEJM5, 0473521001, 5027740891, SDHL-8BNS-K-363-A0-ETB(HF)) requires two button presses for insertion and removal. Hinged-lid (ST1W008S4ER1500) uses a hinged cover mechanism. Selection depends on user interface design and application requirements. These are not interchangeable without design modification.

Q: How does MSL classification affect part selection?

A: MSL 1 (Unlimited) parts have no moisture sensitivity restrictions and require standard storage conditions. SDHL-8BNS-K-363-A0-ETB(HF) lists MSL as Not Applicable, indicating different moisture handling requirements. Verify storage and handling procedures with the manufacturer for this part.

Q: Which substitute offers the best supply chain stability?

A: 5027740891 (Molex) offers the highest inventory (360,406 units) and maintains the 10-position configuration. DM3AT-SF-PEJM5 (Hirose) provides the second-best option with 50,300 units and direct equivalence. Both are Active status parts suitable for long-term production.

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