HRS DM3AT-SF-PEJM5 40 microSD Card Connector with push push ejection mechanism and strong structure

Product Overview

The HIROSE DM3 Series microSD Card Connectors are designed for extremely compact applications, offering the smallest external dimensions and above-the-board height on the market. These connectors feature a unique reverse card insertion protection mechanism, ensuring durability and correct card re-insertion. An effective ground and shield configuration with 4-connection points provides secure grounding and EMI protection. Constructed with high-strength materials, they offer a rigid and strong structure despite their small size. The series includes models with card detection switches and various insertion/ejection mechanisms, such as Push-Push with ejection, Hinge Push-Pull manual, and Push-Pull manual, catering to diverse application needs where space is critical and reliable card handling is essential.

Product Attributes

• Brand: HIROSE ELECTRIC CO., LTD.
• Series: DM3 Series
• Product Type: microSD Card Connectors
• Certifications/Standards: UL94V-0 (Insulator)

Technical Specifications

Item	Specification	Conditions	Notes
Current Rating	0.5A
Voltage Rating	125V AC
Operating Temperature Range	-25C to +85C		Includes temperature rise caused by current flow.
Storage Temperature Range	-40C to +85C		Refers to products stored for long periods prior to mounting and use.
Operating Humidity Range	RH 95% max. (No condensation)
Insulation Resistance	1000M min. (Initial value)	Measure at 500V DC
Withstanding Voltage	500 V AC / 1 minute	1mA	No flashover or insulation breakdown
Contact Resistance	40m max. (change from initial value)
Vibration	10 to 55Hz, single amplitude of 0.75mm, 3 directions for 2 hours		No damage, cracks or parts dislocation.
Humidity	96 hours at of 40 2C, and humidity of 90 to 95%		No damage, cracks or parts dislocation.
Temperature Cycle	-55C 5 to 35C 85C 5 to 35C Times : 30 min. 5 min. 30 min. 5 min. 5 cycles		No damage, cracks or parts dislocation.
Durability	10,000 cycles, 400 to 600 cycles per hour (DM3AT, DM3B) 5,000 cycles, 400 to 600 cycles per hour (DM3C, DM3D)		No deformation of components affecting performance.
Resistance to Soldering Heat	Reflow: At the recommended temperature profile Manual soldering: 350C for 3 seconds

DM3 Series Models & Features

Model	Type	Mechanism	Mounting	Ejection	Card Fall-out Prevention	Termination Leads
DM3AT	Push-Push	Push-Push	Top board mounting (Standard)	With ejection mechanism	Built-in card tray and unique push insertion-push ejection mechanism (patented)	Exposed
DM3BT	Push-Push	Push-Push	Bottom board mounting (Reverse)	With ejection mechanism	Built-in card tray and unique push insertion-push ejection mechanism (patented)	Exposed
DM3CS	Hinge	Push-Pull, manual	Top board mounting (Standard)	Without ejection mechanism	Hinged metal cover provides location and guides card.	Accessible
DM3D	Push-Pull	Push-Pull, manual	Top board mounting (Standard)	Without ejection mechanism	Partial card insertion hold	Accessible (inner lead system)

Materials / Finish

Part	Material	Finish	Remarks
Insulator	LCP	Color: Black	UL94V-0
Contacts	Copper alloy	Contact area: Gold plated Lead area: Gold plated
Guide cover	Stainless steel	Lead area: Gold plated
Other components	Copper alloy	Nickel plated (DM3AT, DM3BT) Tin plated (DM3CS, DM3D)	Piano wire (DM3AT) (DM3BT)

Product Number Structure Example

Series Name	Connector Type	Number of Contacts	Termination Type	Card Ejection Code
DM3	AT (Push-Push, Top board mounting)	8	SF (Right-angle SMT, Standard)	PEJM5 (Push insert/push eject)

Precautions

• Do not immerse or clean the entire connector with cleaning solutions.
• Do not apply excessive force to the connector.
• Follow correct insertion/ejection procedures to avoid damage.
• Ensure correct mounting on the PC board before card insertion.
• For mounting on Flexible Printed Circuit (FPC), use a flat reinforcement plate (0.3 mm min. thick).
• Small visible residual manufacturing fluids or tooling marks do not affect performance.
• Repeated insertions and removals may leave marks on the card, but do not affect connector performance.

2411201514_HRS-DM3AT-SF-PEJM5-40_C597971.pdf