ApplicationWhen protecting telecommunication circuits, SIDACtor devices are connected across Tip and Ring for metallic protection and across Tip and Ground and Ring and Ground for longitudinal protection. They typically are placed behind some type of current-limiting device, such as Teccor's F1250T Telelink slow blow fuse. Common applications include:
• Central office line cards (SLICs)
• T-1/E-1, ISDN, and xDSL transmission equipment
• Customer Premises Equipment (CPE) such as phones, modems, and caller ID adjunct boxes
• PBXs, KSUs, and other switches
• Primary protection including main distribution frames, five-pin modules, building entrance equipment, and station protection modules
• Data lines and security systems
• CATV line amplifiers and power inserters
• Sprinkler systemsSpecifications
- Symmetrical latch switch points
- Resistant to physical stress
- Superior temperature stability
- Output short-circuit protection
- Operation from unregulated supply down to 3V
- Reverse battery protection
- Solid-state reliability
- Small package sizes
DescriptionSIDACtor components are solid state crowbar A1220 and A1221 designed to protect telecom equipment during hazardous transient conditions. Capitalizing on the latest in thyristor advancements, Teccor makes SIDACtor A1220 and A1221 with a patented ion implant technology This technology ensures effective protection within nanoseconds, up to 5000 A surge current ratings, and simple solutions for regulatory requirements such as GR 1089, TIA-968 (formerly known as FCC Part 68), ITU-T K.20, ITU-T K.21, and UL 60950.
The A1220 and A1221 Hall-effect sensors are extremely temperature-stable and stress-resistant sensors especially suited for operation over extended temperature ranges to +150°C. Superior high-temperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. A1220 and A1221 include on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-collector output to sink up to 25mA. A south pole of sufficient strength will turn the output on. A north pole is necessary to turn the output off.
An on-board regulator permits operation of A1220 and A1221 with supply voltages of 3 to 24V. The advantage of operating of A1220 and A1221 at 3V is that it can be used in 3V applications or additional external resistance can be added in series with the supply pin for greater protection in applications that can supply higher voltages.
Two package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W surface mount package while UA is a three-lead ultra-mini-SIP for through-hole mounting. Each package type is available as lead (Pb) free (suffix, ), with a 100% matte tin plated lead frame.
A1220 Data Sheet
