Five types, from wireless bands to dual-wire wrist straps.
Wired or wireless: the grounding method sets the protection level
A wired strap continuously drains body static through a ground cord to a ground point. With a good ground, it is the most reliable method recognized in ANSI/ESD S1.1. A wireless (cordless) strap uses built-in capacitive or resistive elements for local static suppression; it is easier to move around with but gives weaker protection than a wired strap. For highly sensitive parts (bare die, BGAs, precision sensors), use a wired strap; consider a wireless strap only where grounding is not possible or operators move around often.
The five types
| Type | Grounding | Cord / features | Weight | Where used |
|---|---|---|---|---|
| Adjustable oval wireless band | Wireless (built-in) | Standard, no cord, adjustable oval design | 25 g | Where grounding is not possible / line patrol staff |
| Wired strap, 1.8 m | Wired | 1.8 m ground cord for fixed benches | — | Bench work with little movement |
| Wired strap, 4 m | Wired | 4 m extended ground cord, wider reach | Band 8 g, total 40 g | Stations that need some movement, SMT lines |
| Dual-wire wrist strap | Wired, two circuits | Two independent ground circuits; protection continues if one breaks | — | High-risk work, continuous monitoring |
| ESD ankle strap (black / blue) | Wired (ankle) | Worn with ESD shoes on ESD flooring | — | Assembly work where both hands must be free |
Why dual-wire
A standard wired strap has one ground circuit. If the band loosens, the cord breaks or the ground point fails, body static can build up without the operator noticing. A dual-wire design runs two independent circuits at the same time; if one opens, the other keeps protecting, and it can be used with a continuous monitor that raises an alarm. It is used at workstations handling very static-sensitive parts such as wafers and MEMS sensors.
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