Special parts · Board-mount backup battery
LTC-7P Lithium Battery
High-capacity, long-life lithium thionyl chloride cell that solders to the board and keeps memory alive for up to ten years
The Eagle-Picher LTC-7P is a Keeper series board-mount primary lithium cell using lithium thionyl chloride (Li-SOCl₂) chemistry, delivering 750 mAh at a 3.5 V nominal operating voltage. Its hermetically sealed stainless steel case mounts directly on the printed circuit board with no holder, which is why it backs up SRAM and real-time clocks in instruments, industrial controllers and aerospace equipment. The flat discharge curve holds the voltage steady over the whole service life, so the circuit designer does not have to allow for voltage decay.
Overview
The Eagle-Picher LTC-7P belongs to the Keeper series of board-mount lithium thionyl chloride (Li-SOCl₂) primary cells designed for direct PCB mounting. It is widely used for SRAM and real-time clock backup in frequency counters, time interval analyzers, industrial instruments and aerospace equipment. The rectangular prismatic cell (30.0 × 17.0 × 7.0 mm) has a hermetically sealed all-stainless-steel case, an internal short-circuit protection design so an accidental short does not become a hazard, and four PCB pins compatible with standard wave soldering for up to 5 seconds without loss of performance. Rated capacity is 750 mAh at 25°C and a 350-hour discharge rate, rated open-circuit voltage (OCV) is 3.67 V, operating voltage 3.5 V, and the operating temperature range is −55°C to +85°C. Self-discharge is very low, so the cell stores at room temperature and provides more than ten years of backup life. It is UL Recognized, RoHS / WEEE compliant and UN transport tested, meets US federal hazardous-materials shipping rules, and can be bought and shipped internationally from stock.
Key specifications
| Model | LTC-7P |
|---|---|
| Manufacturer | Eagle-Picher Technologies (Keeper series) |
| Chemistry | Lithium thionyl chloride (Li-SOCl₂) |
| Nominal open-circuit voltage (OCV, 25°C) | 3.67 V |
| Nominal operating voltage (25°C) | 3.5 V |
| Rated capacity (350 hr rate, 25°C) | 750 mAh |
| Dimensions (L × W × H) | 30.0 × 17.0 × 7.0 mm |
| Weight | 9.0 g |
| Operating temperature range | −55°C to +85°C |
| Terminals | Four PCB pins (direct board mount) |
| Case | Hermetically sealed, stainless steel |
| Compliance | UL Recognized, RoHS / WEEE, UN transport tested, US federal hazardous-materials shipping regulations |
Features
High capacity, long life
750 mAh with very low self-discharge gives up to ten years of backup at room temperature, cutting maintenance visits and replacement cost.
Direct PCB mounting
Four PCB pins are compatible with standard wave soldering for up to 5 seconds without harm; no holder needed, so the board footprint stays small.
Flat discharge curve
The rectangular prismatic design gives a flat discharge curve with a steady voltage over the whole service life, ideal for SRAM retention and real-time clock circuits.
Wide operating temperature range
Operates from −55°C to +85°C for aerospace, defense and industrial sites, proven under harsh conditions.
Hermetic seal and safety protection
Fully sealed stainless steel case with internal current limiting against accidental shorts; UL Recognized, RoHS / WEEE and UN transport tested.
Made for precision instruments
Designed for the memory backup circuits of frequency counters, time interval analyzers, industrial controllers and communications equipment, where long-term reliability matters.
Typical applications
Calibration data retention
SRAM backup in frequency counters and time interval analyzers
High-precision frequency counters such as the Pendulum CNT-104S and CNT-102 keep calibration constants and user settings in on-board SRAM. The LTC-7P feeds that memory at microamp levels after the mains is switched off, so calibration data survives a restart and the instrument avoids a costly recalibration and downtime.
Industrial instrument maintenance
End-of-life battery replacement and preventive maintenance on field instruments
Industrial controllers, data loggers and communications modules that run for years warn at power-up before the backup cell dies. Engineers fit an LTC-7P on the board, using its four through-hole pins and wave-solder compatibility to replace the cell without damaging the PCB, extending equipment life and keeping the real-time clock (RTC) running.
Extreme environments
Long-life backup power for aerospace and defense equipment
Aerospace payloads, satellite ground-station controllers and military test instruments stand by for years across −55°C to +85°C. The hermetic stainless steel case and the very low self-discharge of lithium thionyl chloride chemistry (under 1% per year at room temperature) give more than ten years of dependable memory backup without a battery change, meeting defense procurement demands for storage life and harsh-environment tolerance.
Options and configuration
Tick the options you need; the configuration list is carried into the quote request.
Standard configuration (included)
Cell configuration and capacity options
Pin and mounting options
Downloads
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