SD 4.0 Card Connector Push-Pull Bottom Mount Height 5.23mm
SD 4.0 Card Connector Push-Pull Bottom Mount Height 5.23mm

SD 4.0 Card Connector Push-Pull Bottom Mount Height 5.23mm

Model
SD 4.0 Card Connector（SD523-D6251-01）

Item specifics

Product Height
5.23mm
Usable Memory Card
SD 4.0/SD 3.0memory card
Base Material
LCP
Terminals Material
Phosphorous Bronze
Shell Material
Stainless Steel

Review

Description

SD 4.0 card connector · Push-pull · Bottom mount

5.23mm SD 4.0 card connector
Stable reads, reliable insertion

A 1.20mm pitch, 17-pin SD 4.0 card connector in a bottom mount, push-pull design.

  • 5.23mm mounted height
  • 1.20mm terminal pitch
  • 17 pins
  • 10,000 cycles
Free samples + quote Download 2D drawing

Engineer reply within 1 working day · RoHS compliant · Custom options available

SD523-D6251-01
5.23mm height
SD523-D6251-01 · in stock for sampling
312 MB/speak transfer
5.23mmMounted height
10,000Insertion cycles
-45~80°COperating range
Start from the failure

A card connector is invisible — until it fails

Connector failures are rarely dramatic. They are a few milliohms of drift, a lifted pad, a card that reads intermittently in a hot car.

01 / MECHANISM

The more mechanism, the more failure points

Push-pull has no ejector — fewer parts, lower cost, and nothing to jam or wear out. The card is held by the shell and pulled straight out.

No ejector
02 / SIGNAL INTEGRITY

Data drops at speed, card not detected

Gold-plated terminals (≥0.025 µm) hold contact resistance to ≤30 mΩ with tight coplanarity control, keeping high-speed signals stable through humidity and thermal cycling.

Contact integrity
03 / REFLOW RELIABILITY

Reflow warps the insulator, pads lift

An LCP insulator takes lead-free reflow without deformation; the stainless-steel shell keeps the frame flat; terminals are coplanarity-controlled to ±0.05 mm.

SMT yield
04 / FIELD FAILURE

Card detection fails after a few insertions

A reliable detect switch guarantees card detection, backed by the retention structure, for 10,000 insertion cycles.

Card detection
Specifications

Every parameter, translated into a design decision

A datasheet lists values. A specification explains what each value controls. Final tolerances, plating thickness and acceptance criteria are confirmed on the 2D drawing and datasheet.

Mechanical

Mounting type
Bottom mount
Mounted height
5.23mm
Terminal pitch
1.20mm
Number of pins
17
Mechanism
Push-pull (no ejector)
Terminal coplanarity
±0.05 mm

Electrical

Rated current
0.5 A
Rated voltage
500 V
Contact resistance
≤30 mΩ
Insulation resistance
1,000 MΩ
Transfer rate
312 MB/s
Durability
10,000 cycles

Materials & plating

Insulator
LCP
Terminals
Phosphorous Bronze · gold ≥0.025 µm
Shell
Stainless Steel
Process
Lead-free reflow compatible
Card type
SD 4.0/SD 3.0memory card

Environment & ordering

Operating temperature
-45 ~ 80°C
RoHS
Compliant
Part number
SD523-D6251-01
Sampling lead time
7 days
Sample policy
Free samples
Inside the connector

Four decisions that keep the card reading

Every structural decision keeps the card reading and held in place.

SD523-D6251-01
SD523-D6251-01 — stainless shell, LCP insulator, gold-plated terminals.
01
Push-pull mechanismNo ejector mechanism; the card is held by the stainless shell — push in, pull out. Fewer parts, nothing to jam.
02
Gold-plated phosphor bronze terminalsGold resists oxidation; phosphor bronze keeps normal force over thousands of insertions, holding contact resistance to ≤30 mΩ.
03
LCP insulatorDimensional stability through lead-free reflow, so pin position and coplanarity survive the oven — not just the drawing.
04
Stainless-steel shellHolds the card under drop and vibration, shields the contact field, and keeps the frame flat during assembly.
SD523-D6251-01
Bottom mount, design, 5.23mm mounted height.
Selection matrix

Same card, multiple mechanical answers

Same card, same interface — the family offers different height and mechanism combinations. Most mistakes are the right connector in the wrong stack-up.

ModelHeightMechanismMountingChoose it when
SD290-T1250-012.90mmPush-pullBottom mountPush-pull
SD523-D6251-01This page5.23mmPush-pullBottom mountPush-pull
SD400-D1251-204.00mmPush-pullBottom mountPush-pull
SD313-T1251-013.13mmPush-pullBottom mountPush-pull
SD300-T1230-013.00mmPush-pushBottom mountPush-push
Applications

Built for products that get carried, dropped and used daily

Wherever the card is a user-accessible medium, retention and contact stability matter more than price.

Laptops & tabletsThin lids and dense boards — a low-profile socket protects the thickness budget.
Card readers & docking stationsHigh insertion frequency; gold plating and 10,000 cycles carry the duty.
Digital camerasField card swaps and burst shooting; the high-speed interface covers 4K/8K and RAW.
Industrial & vehicle electronicsVibration and wide temperature; stainless shell and LCP body hold alignment.
Documents

Everything your mechanical engineer needs

PDF · 2D
2D drawing All views, dimensions and tolerances for SD523-D6251-01. Download →
PDF · DATA
Datasheet Electrical, mechanical and material specifications. Download →
3D · TEST
3D model & test report For enclosure clearance checks and compliance filing. Request →
Before you ask

Frequently asked questions

What is the difference between SD 3.0 / 4.0 / 7.0 / 8.0?

It is mainly transfer speed: SD 3.0 (UHS-I) ~104 MB/s, SD 4.0 (UHS-II) ~312 MB/s, SD 7.0 (UHS-III) ~624 MB/s, and SD 8.0 (SD Express) peaks around 4 GB/s. Interfaces are backward compatible with the same card opening, but higher speed demands more signal integrity.

Should I choose push-push or push-pull?

Push-push has an ejector and pops the card out — good for consumer devices. Push-pull has no ejector, fewer parts and nothing to jam — good for fixed and industrial use.

Is it reflow compatible?

Yes. SMT sockets use an LCP insulator and coplanarity-controlled terminals for standard lead-free reflow; the exact profile is in the datasheet and drawing.

Can you cross-reference an imported brand?

Send the part number and drawing. We compare pad layout, height, pitch and retention, then confirm drop-in or layout-change before sampling.

What is the minimum order and lead time?

Samples are free, sampling takes 7 days, and volume production is 7–15 days. MOQ and lead time are confirmed with the quotation; zero-MOQ trial runs are available.

Send your stack-up. Get a drawing, a sample and a straight answer.

Tell us the product thickness, card type, annual volume and the part you are replacing (if any). An engineer replies within one working day with the right model, the drawing you need, and what we would change in your layout — if anything.

1Send requirements
2Drawing + sample
3Approve & produce
Request a quote & sample sales@moarconn.com

Mention part number SD523-D6251-01 for the fastest reply.

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