The document describes the MINIFLEX 175-ST FPC connector. It has the world's smallest pitch of 0.175mm and a super low profile of 0.57mm maximum height. It provides high retention force for the FPC with an additional mechanical lock. Key features include sufficient contact wiping length, a LIF design to hold the FPC temporarily, and a structure to prevent contact distortion. It can still function reliably even if the actuator is accidentally closed without an FPC inserted, though the insertion force may increase.

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Seiko assumes no responsibility for any inaccuracies or obligation to update information on these
documents. Please kindly handle these documents with utmost secrecy and confidentiality.
(C) Copyright Dai(C) Copyright Dai--ichi Seiko Co., Ltd. All rights reserved.ichi Seiko Co., Ltd. All rights reserved.
2014/11R1
MINIFLEX 175MINIFLEX 175--STST
FPC ConnectorFPC Connector

2. 1(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
MINIFLEX175MINIFLEX175--ST: Product SummaryST: Product Summary
World’s smallest pitch (0.175mm pitch) Super Low profile (0.57mm max.)
High FPC retention force with additional mechanical lock
 Name MINIFLEX 175-ST
 Pitch 0.175 mm
 Pin count range 7p - 31p (Plan)
 Available pin count 19p
 Mating type
- Horizontal mating
- Back-lock type w/additional mechanical lock
- Upper contact design
 Height 0.57 mm max. (Actuator closed)
 Depth 3.0 mm (Actuator closed)
 Width 5.24 mm （19P）
 Cable FPC (FPC thickness : 0.12 mm +/-0.03mm)
MINIFLEX 175-ST

3. 2(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
MINIFLEX175MINIFLEX175--ST: AppearanceST: Appearance
FPC thickness：0.12±0.03
Contact
Lock
Actuator
Pitch : 0.175mm
2.65mm 3.0mm
19P : 5.24mm
Housing
Hold down

4. 3(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
0.57mm MAX.
1. Super low profile1. Super low profile
MINIFLEX 5-BFT MINIFLEX 5-BFN II
1.1mm MAX.
MINIFLEX 175-ST
0.7mm MAX.
Super low height 0.57mm MAX.Super low height 0.57mm MAX.Super low height 0.57mm MAX.

5. 4(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
2. Contact wiping length2. Contact wiping length
Upper contact Design
Contact-A wiping length： 0.85mm
Insertion length：1.05mm
Contact-B wiping length： 0.4mm
0.85mm and 0.4mm wiping length insures reliable contact0.85mm and 0.4mm wiping length insures reliable contact0.85mm and 0.4mm wiping length insures reliable contact
Pad wiping length： 0.25mm
Pad wiping length： 0.3mm

6. 5(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
3. FPC retention force3. FPC retention force
Lock
FPC with cutout
High FPC retention force with additional mechanical lockHigh FPC retention force with additional mechanical lockHigh FPC retention force with additional mechanical lock
FPC LOCK mechanism maintains
high FPC retention force
MINIFLEX175-ST
(H=0.57mm MAX.)
MINIFLEX3-BFN
(H=1.0mm MAX.)
7.634N
(19p)
6.7N
(19p)
FPC retention force comparison
*Despite super low profile and smaller pitch, retention force is
very similar to larger 0.3mm pitch product.

7. 6(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
4. LIF design4. LIF design
LIF provides temporary FPC holding before closing actuatorLIF provides temporary FPC holding before closing actuatorLIF provides temporary FPC holding before closing actuator
FPC thickness
t=0.12mm
Contact gap: 0.10mm gap holds
FPC temporary

8. 7(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
5. Structure to prevent contact distortion5. Structure to prevent contact distortion
Ribs
Contact distortion preventing designContact distortion preventing designContact distortion preventing design
Ribs
When opening the actuator, the ribs will
prevent the contacts being pulled up

9. 8(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
6. Oops! You closed the actuator without FPC inserted?6. Oops! You closed the actuator without FPC inserted?
If connector actuator was closed accidently without FPC inserted…If connector actuator was closed accidently without FPC insertedIf connector actuator was closed accidently without FPC inserted……
*No temperature change should be applied during the actuator closed state. No reflow soldering should be done at actuator closed
state. FPC insertion force will increase after first actuator operation without FPC inserted. It is strongly recommended to avoid any
actuator open / close operation without FPC inserted from the beginning.
- Connector will still function reliably
AVE: 0.092
（0.102-0.088）
The edge of contact does not come out from Housing
AVE : 0.070
（0.078-0.066）
AVE : 0.090
（0.096-0.081）
AVE : 0.066
（0.076-0.058）
C/T-A Initial C/T-A After one time operation C/T-B Initial C/T-B After one time operation

10. 9(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
6. Oops! You closed the actuator without FPC inserted?6. Oops! You closed the actuator without FPC inserted?
If connector actuator was closed accidently without FPC inserted…If connector actuator was closed accidently without FPC insertedIf connector actuator was closed accidently without FPC inserted……
*No temperature change should be applied during the actuator closed state. No reflow soldering should be done at actuator closed
state. FPC insertion force will increase after first actuator operation without FPC inserted. It is strongly recommended to avoid any
actuator open / close operation without FPC inserted from the beginning.
Initial After one time insertion
- Insertion force of connector goes up
No damage

11. 10(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
6. Oops! You closed the actuator without FPC inserted?6. Oops! You closed the actuator without FPC inserted?
If connector actuator was closed accidently without FPC inserted…If connector actuator was closed accidently without FPC insertedIf connector actuator was closed accidently without FPC inserted……
*No temperature change should be applied during the actuator closed state. No reflow soldering should be done at actuator closed
state. FPC insertion force will increase after first actuator operation without FPC inserted. It is strongly recommended to avoid any
actuator open / close operation without FPC inserted from the beginning.
Initial After one time insertion
- Retention force of connector does not change
Same
damage

12. 11(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
SummarySummary
 Super Low profile 0.57mm MAX.
 Sufficient contact wiping length
 High FPC retention force with additional mechanical lock
 LIF design
 Structure to prevent contact distortion
 Oops! You closed the actuator without FPC inserted?

13. 12(C) Copyright DAI-ICHI SEIKO Co., Ltd. All rights reserved. 2014/11R1
 Rated current
0.3A DC (per contact)
6.0A DC (per connector)
 Rated voltage 50V AC (per contact)
 Operating Temperature 233 to 358k (-40ºC to +85ºC)
 Dielectric Withstanding
Voltage
AC 200V
 Insulation Resistance 100M ohm MIN. (DC 250V)
 Contact Resistance 80m ohm MAX. (Initial)
 Durability cycles 20 cycles
 Height (MAX.) 0.52 mm (0.57 mm) (Actuator Closed)
 Depth 7 - 31pin: 3.0 mm (Actuator Closed)
 Width 5.24 mm (19P)
 Applicable Cable FPC (Thickness: 0.12mm +/-0.03)
AppendixAppendix--1.1. MINIFLEX 175MINIFLEX 175--STST : Specifications: Specifications