Rubidium Atomic Clock | KRA Series | High-Stability Frequency Standard

Name: Rubidium Oscillator
Brand: KCCS
Availability: InStock

Key Specifications

Parameter	KRA50	KRA76	KRA76 (wide)	KRA94	KRAL
Package (mm)	50.8×50.8×25	89×76×28	89×76×28	127×94×32	127×94×31.5
Output	10 MHz	10 MHz	10 MHz	10 MHz	10 MHz
Factory Offset	≤±5E-11	≤±5E-11	≤±5E-11	≤±5E-11	≤±5E-11
Stability (1s/10s/100s)	5E-11/1.8E-11/7E-12	1E-11/3E-12/1E-12	1E-11/3E-12/1E-12	1E-11/3E-12/1E-12	1E-11/3E-12/1E-12
Aging /24h	≤5E-12	≤1.5E-12	≤1.5E-12	≤1.5E-12	≤1E-12
Freq vs Temp	≤2E-10	≤5E-10 (-20~+60℃)	≤3E-10 (-40~+60℃)	≤1E-10 (-40~+70℃)	≤2E-10 (-40~+60℃)
1PPS Accuracy	—	≤±1E-12/24h	≤±1E-12/24h	≤±1E-12/24h	≤±1E-12/24h
Time to Lock	≤5min RT / ≤15min -5℃	≤5min RT / ≤15min -40℃	≤5min RT / ≤15min -40℃	≤5min RT / ≤12min -40℃	≤5min RT / ≤10min -40℃
Holdover	—	≤1 μs/24h	≤1 μs/24h	≤1 μs/24h	≤1 μs/24h
Power (steady/max)	≤6W / ≤20W	≤6W / ≤20W	≤6W / ≤20W	≤10W / ≤23W	≤12W / ≤28W
Supply Voltage	+5V±0.1	+5V±0.1	+11.4~+30V	+11.4~+16V	+22~+30V
Temp. Range	-5~+60℃	-20~+60℃	-40~+60℃	-40~+70℃	-40~+60℃

Frequently Asked Questions

What is a chip-scale atomic clock (CSAC)?

A chip-scale atomic clock (CSAC) is a miniature atomic frequency standard that uses coherent population trapping (CPT) in a vapor cell to stabilize an oscillator. KCCS CSACs consume only 130 mW, making them suitable for battery-powered and portable applications where rubidium standards are too power-hungry.

How does CSAC compare to OCXO and rubidium?

CSAC offers better long-term stability than OCXO (ADEV <3E-11 at 1s vs <1E-12 for premium OCXO) but lower than rubidium (<1E-11). CSAC is much smaller and lower power (130 mW) than rubidium (<5 W), filling the gap between high-end OCXO and full-size atomic standards.

Is KCCS CSAC pin-compatible with Microsemi SA.45s?

Yes. KCCS CSAC uses the SA.45s pin-compatible DIP package, allowing direct drop-in replacement. The multi-frequency version outputs 10, 16.384, 20 and 24.576 MHz simultaneously at 150 mW, with I2C/UART digital interface.

What is the warm-up time for a CSAC?

KCCS chip-scale atomic clocks achieve rated stability within <3 minutes of power-on. This is comparable to high-end OCXOs and much faster than traditional rubidium standards (which typically require 5-10 minutes).

Rubidium Oscillator