XD551 – Precision Timer IC – Xinluda

The Xinluda XD551 is a low-power CMOS monolithic precision timer (555-type) in a DIP-8 package, operating from 2V to 15V at frequencies up to 2MHz. Available for RFQ from Pacific Component Xchange.

The Xinluda XD551 is a monolithic CMOS precision timer integrated circuit, the through-hole member of Xinluda’s XD551/XL551 timing family. Pin-compatible with the industry-standard 555 timer, the XD551 is fully compatible with CMOS, TTL, and MOS logic and operates at frequencies up to 2MHz. Its high input impedance allows the use of smaller timing capacitors, enabling more accurate time delays and oscillations while keeping power consumption low across the full supply range. The XD551 is supplied in a through-hole DIP-8 package; the functionally equivalent SOP-8 surface-mount version is offered as the XL551.

Like the classic 555, the XD551 features a trigger level at approximately one-third of the supply voltage and a threshold level at approximately two-thirds of the supply voltage, both adjustable through the control voltage (CONT) terminal. The device supports monostable (one-shot) and astable (oscillator) operation, with an active-low RESET input that overrides all other inputs to initiate a new timing cycle and an open-collector discharge (DISCH) output for the external timing capacitor.

Key Features

• CMOS monolithic precision timer (555-type), single timer
• Single-supply operation from 2V to 15V
• Operating frequency up to 2MHz
• Very low power consumption: 170uA at VDD = 5V
• Capable of operation in astable (oscillator) mode
• High output-current capability: sink 100mA (max), source 10mA (typ)
• Output fully compatible with CMOS, TTL, and MOS
• Low supply current reduces spikes during output transitions
• Adjustable comparator thresholds via control voltage (CONT) terminal
• Active-low RESET overrides all inputs
• ESD protection exceeds 1500V per MIL-STD-883C, Method 3015.2
• Operating temperature range: 0°C to 70°C
• Package: DIP-8 (XD551); SOP-8 footprint available as XL551

Applications

• Precision timing and time-delay generation
• Astable oscillators and pulse generators
• Monostable one-shot circuits
• Pulse-width modulation (PWM) and pulse-position modulation
• Sequential timing and frequency division
• Touch and proximity switch timing

Why Source XD551 from Pacific Component Xchange

The XD551 is a hard-to-find part with little to no authorized-distributor availability, and Xinluda components are not stocked by the major franchise distributors. Pacific Component Xchange is an independent distributor specializing in sourcing scarce, allocated, and obsolete power-management ICs, timers, and optocouplers. Our global supply network and rigorous incoming-inspection and authenticity-verification processes help engineers and buyers secure genuine parts when standard channels come up empty. We support worldwide shipping and flexible quantities for both prototype and production needs. Request a quote (RFQ) for the XD551 today and our sourcing team will respond quickly with availability, lead time, and pricing.