This is the true State-of-the-Art!

Amptek has developed a 70 mm² FAST SDD® Detector in a TO-8 package. This is the same package that is used with all Amptek detectors. This makes the 70 mm² a drop in replacement (same package, same pin-out, same voltages). Triple the count rate vs. the 25 mm² SDD with the same performance.


70 mm2 FAST SDD
Figure 1. 70 mm² FAST SDD mounted on a TO-8 header
  • 70 mm² active area collimated to 50 mm²
  • 123 eV FWHM resolution at 5.9 keV
  • Count rates > 2,000,000 CPS
  • High peak-to-background ratio – 26,000/1
  • Preamplifier Output Rise Time <60 ns
  • Windows: Be (0.5 mil) 12.5 µm, or C2 (Si3N4)
  • Radiation hard
  • Detector thickness 500 µm
  • TO-8 Package
  • Cooling ΔT>85 K
  • Multilayer Collimator


  • Ultra-fast benchtop and handheld XRF analyzers
  • Scanning/mapping of samples in an SEM as part of an EDS system
  • On-line process control
  • X-Ray Sorting Machines
  • OEM


Figure 2. 55Fe Spectrum taken with the 70 mm² FAST SDD® Detector


70 mm2 FAST SDD resolution vs. peaking time and temperature

Figure 3. Resolution vs. peaking time at different detector temperatures.

70 mm2 FAST SDD Carbon Spectrum EDS SEM

Figure 4. Carbon spectrum taken with the 70 mm² FAST SDD® and a C2 window in an SEM.

70 mm2 FAST SDD® Specifications

Detector TypeSilicon Drift Detector (SDD)
Detector Size70 mm2 - collimated to 50 mm2
Silicon Thickness500 µm
CollimatorInternal Multi Layer Collimator (ML)
Energy Resolution @ 5.9 keV (55Fe)123 - 135 eV FWHM at 4 µs peaking time
Peak to Background20,000:1 (ratio of counts from 5.9 keV to 1 keV) (typical)
Detector Window Options0.5 mil (12.5 µm) Be or C2 (Si3N4)
Charge Sensitive PreamplifierCMOS
Gain Stability<20 ppm/°C (typical)
XR-100FastSDD Case Size3.00 x 1.75 x 1.13 in (7.6 x 4.4 x 2.9 cm)
XR-100FastSDD Weight4.4 ounces (125 g)
Total Power<2 Watt
Warranty Period1 Year
Typical Device Lifetime5 to 10 years, depending on use
Operation conditions-35°C to +80°C
Storage and ShippingLong term storage: 10+ years in dry environment
Typical Storage and Shipping: -40°C to +85°C, 10 to 90% humidity non condensing
TUV Certification
Certificate #: CU 72072412 02
Tested to: UL 61010-1: 2004 R7 .05
CAN/CSA-C22.2 61010-1: 2004
Preamp PowerXR100 configuration: ±8 V @ 15 mA with no more than 50 mV peak-to-peak noise
OEM configuration (PA210/230 or X-123): ±5 V
Detector Power-100 to -180 V @ 25 µA very stable <0.1% variation
Cooler PowerCurrent = 450 mA maximum, voltage = 3.5 V maximum with <100 mV peak-to-peak noise
Note: the XR-100FASTSDD includes its own temperature controller
Preamplifier Sensitivity3.6 mV/keV typical (may vary for different detectors)
Preamplifier PolarityPositive signal output (1 kohm maximum load)
Preamplifier Output Rise Time<60 ns
Preamplifier FeedbackReset
Temperature Monitor SensitivityVaries with configuration
When used with PX5, DP5, or X-123: direct reading in Kelvin through software.

Configurations & Options

The 70 mm2 FAST SDD is available with the standard Amptek options and OEM configurations.

PA-230 Housing X-123 FAST SDD Spectrometer with C2 Window, Vacuum Extender, and Feedthrough Coupling
The XR-100FAST SDD-70 with the PX5 The FAST SDD-70 with its preamplifier is available in several OEM configurations The X-123FAST SDD-70 configuration includes the detector, preamplifier, digital processor and power supplies all in one box The 70 mm2 FAST SDD is compatible with all Amptek vacuum accessories



  • All dimensions in inches unless otherwise specified.
  • All dimensions are “typical” unless a tolerance is listed.
  • NOTE for C2 window: A nickel washer is mounted on the front surface to provide additional protection.

Mechanical Dimensions of Amptek Si-PIN and SDD detectors

TO-8 STP File

Detector Type Area/Thickness Rdet (mm) Adet (mm2) Rcoll (mm) Acoll (mm2) Lcoll (mm) Ldet (mm) Rwin (mm) Rwasher (mm)
70 mm2 Be window 70 mm2/500 µm 4.72 70 mm2 4.00 50.27 0.9 1.4 4.50
70 mm2 C2 window 70 mm2/500 µm 4.72 70 mm2 4.00 50.27 0.9 1.4 4.00 4.24

All results on this page are typical performance values at full cooling; please Contact Us to discuss guaranteed performance under different operating conditions.  Specifications subject to change without notice.