JST connector

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2.50mm JST-XH top-entry (vertical) male PCB connectors
Lithium polymer battery for Parrot AR.Drone with 4-pin JST-XH female connector (right, facing the camera) and 2-pin mini-Tamiya connector (left).[1]

JST connector is an incorrect vernacular term for white electrical connectors mounted on PCBs inside products manufactured in Asia. JST is not a specific type or size of connector, but instead it's an acronym for Japan Solderless Terminal, which is the long form of the company name J.S.T. Mfg. Co., Ltd..[2] JST manufactures numerous series (families) and pitches (pin-to-pin distance) of connectors.[3][4]

Company history[edit]

JST Mfg. Co., Ltd. was established in 1957 as the first Japan manufacturer and distributor of solderless terminals. The founder of JST, Teiji Takahashi, called it "Acchaku-Tanshi", which means "Crimp Contact" in English. The first JST factory was located in Kurayoshi, Tottori, Japan. Today, JST has factories in multiple countries. JST is one of the top ten connector manufacturers in the world with annual sales of approximately 100 billion. Its headquarters is located in Doshomachi, Chuo-ku, Osaka, Japan.[2]

Connector name confusion[edit]

Vendors and end-users of connectors commonly call connectors by their wrong name thus perpetuating confusion of the exact series of a specific connector. Unfortunately, it is very common in some groups and websites to incorrectly name a specific connector only by the name of the manufacturer.

To minimize confusion, it is best to describe a connector using: the manufacturers name, exact connector series, and optionally the pitch; such as "JST-XH" or "JST-XH-2.50mm" or "2.50mm JST XH-series" or other variations.

In recent years, it is preferred to use millimeter (mm) instead of inches for pin-to-pin pitch distance. Sometimes 2.50 mm parts are incorrectly sold on the internet as 2.54 mm (0.100 in), and the 1.25 mm parts as 1.27 mm (0.050 in).

Connector soldering[edit]

A majority of JST through-hole headers can't withstand the temperatures required for reflow soldering, because the plastic has a lower melting point since they were designed for wave soldering methods. Some JST surface-mount headers are designed to handle higher temperatures of reflow soldering.[5]

Connector series[edit]

JST manufactures a large number of series (families) of connectors.[3] The PCB (wire-to-board) connectors are available in top (vertical) or side (horizontal) entry, and through-hole or surface-mount.

The following tables list JST connector series that are commonly used by electronics hobbyists and consumer products for rechargeable battery packs, battery balancers, battery eliminator circuits, and radio controlled servos.[6]

Wire-to-Board Connectors
JST
Series
Pin-to-Pin
Pitch
Pin
Rows
Current
(Amp)
Voltage
(Volt)
Wire Size
(AWG)
Features Compatible
JST Series
Notes
VH [7]
3.96 mm (0.156 in)
1
10
250
22 to 16
Shrouded*, Locking Also available in unshrouded
EH [8]
2.50 mm (0.098 in)
1
3
250
32 to 22
Partial Shrouded This is not 2.54 mm (0.100 in)
XH [9]
2.50 mm (0.098 in)
1
3
250
30 to 22
Shrouded This is not 2.54 mm (0.100 in)
PH [10]
2.00 mm (0.079 in)
1
2
100
32 to 24
Shrouded KR, KRD, CR [11][12][13]
ZH [14]
1.50 mm (0.059 in)
1
1
50
32 to 26
Shrouded ZR, ZM [15][16]
GH [17]
1.25 mm (0.049 in)
1
1
50
30 to 26
Crimp, Locking Some people confuse with Molex PicoBlade-series [18]
SH [19]
1.00 mm (0.039 in)
1
1
50
32 to 28
Crimp, Shrouded SR, SZ [20]
Wire-to-Wire Connectors
JST
Series
Pin-to-Pin
Pitch
Pin
Rows
Current
(Amp)
Voltage
(Volt)
Wire Size
(AWG)
Features Notes
RCY [21]
2.50 mm (0.098 in)
1
3
250
28 to 22
Locking Used in radio control (R/C), also known as BEC or P connector
SM [22]
2.50 mm (0.098 in)
1
3
250
28 to 22
Locking, High contact pressure Used in some RGB LED decorative light strips

See also[edit]

References[edit]

External links[edit]

Official
Other