From Deep UV to Mid-IR

An ITW Company

Infrared Emitters – SA Series

KEY FEATURES• Steady State (DC) Emitters• Emulates a Black-Body in Spectral Distribution• Coiled Filament with Specialized Coating• Reflector Provides Collimated and Uniform Radiation• Typical Emissivity 0.70

Filament Temperature vs Input Power
Opto Diode SA Series infrared (IR) emitters are designed to be used as steady state (DC) emitters of black-bodyradiation. The radiating element in the steady-state emitters is a coiled filament of specific material with aspecialized coating with typical emissivity of 0.70. Radiated output closely emulates a black-body in spectral
distribution. SA Series emitters are designed to operate at a rated filament temperature of 1170 K. Standard SAseries emitters are offered in several models with specific filament diameters and number of coils to provide thedesired input/output power at a filament temperature of 1170 K.
Standard window materials are available to tailor the output to specific wavelength ranges of interest. Standard
models include a parabolic reflector to provide near collimated and uniform radiation output.
Drive Circuit
Any constant voltage or constant current DC power supply with appropriate rating.
Filament Temperature vs. Input Power
Steady State emitters are designed to operate with a filament temperature of approximately 1170 K (900°C) at therated input power. Exceeding this value will raise the element temperature and decrease emitter lifetime. Since
the radiated energy is proportional to the fourth power of the absolute temperature (T4), accurate control of theinput power and proper heat sinking of the package are essential to maintain constant element temperature andoutput. The heat sink must limit the package temperature to not more than 100°C. The relationship between peakwavelength (λpk in microns) and temperature (T in K) for the black-body spectrum is expressed by Wien’s law as:
λpk (microns) x T (K) = 2898
Thus, the wavelength for maximum output varies inversely with the absolute temperature. At a temperature of1170 K, this maximum is at 2.5 microns. SA Series steady state emitters are quasi-black-body with an emissivityof 0.7. The emissivity is the ratio of the energy radiated by the source to that which would be radiated by a true
black-body at the same temperature.

Revision May 22, 2019

Page 1 of 7

From Deep UV to Mid-IR

Infrared Emitters – SA Series

An ITW Company

Black-body Radiant Emittance
SA Series emitters approximate black-body sources at their particular operating temperature. Below is areference graph showing ideal black-body curves at various temperatures, in K.
3.0(W cm-2 micron-1)

2.5
2.0
W500 (λ)
W750 (λ)
W1000 (λ)
W1170 (λ)

1.5
1.0
0.5
0.0

12345678910111213141516171819 20

λ (microns)

Revision May 22, 2019

Page 2 of 7

From Deep UV to Mid-IR

Infrared Emitters – SA Series

An ITW Company

DC Power Curves (I vs. V) SA-Series TO5
DC Power Curve1
2.5Curve
SourcePk DC PowerNo.
Model(watts)
1SA727-5( )1.15
2SA1037-5( )
2.10

AMPS

2.0
1.5

3 watts

1.0

2 watts

20.5

10.0
0.0

1 watts

0.5

1.0

1.5

2.0

2.5

VOLTS
11170 K at power indicated (•). Exceeding this value will raise element temperature and decrease source lifetime.

Polar and Axial Intensity Distribution SA-Series TO5Average DC Intensity2 (@ 1170 K) vs. Angle (@ 3 inches)
1E-2

WATTS PER CM2

SA727-5M2 (@ 1.15 watts)
SA1037-5M2 (@ 2.10 watts)

1E-3-25-20-15-10-50510152025

POLAR ANGLE (degrees)
2

Average of values parallel and perpendicular to axis of element.

DC Intensity2 (@ 1170 K) vs. Distance

WATTS PER CM2

1E-1
SA727-5M2 (@ 1.15 watts)
SA1037-5M2 (@ 2.10 watts)
1E-2

1E-3

1E-4

110AXIAL DISTANCE (inches)

Revision May 22, 2019

Page 3 of 7

From Deep UV to Mid-IRInfrared Emitters – SA Series

An ITW Company

DC Power Curves (I vs. V) SA-Series TO8
DC Power Curve3
2.5

Curve
SourcePk DC PowerNo.
Model(watts)
1SA727-8( )1.2
2SA1037-8( )2.0
3 SA10510-8( )
2.7

AMPS

2.0
1.5

3 watts

1.0

2 watts

20.5

1

0.0
0.0

1 watts

30.5

1.0

1.5

2.0

2.5

VOLTS
31170 K at power indicated (•). Exceeding this value will raise element temperature and decrease source lifetime.

Polar and Axial Intensity Distribution SA Series TO8Average DC Intensity4 (@ 1170 K) vs. Angle (@ 3 inches)

WATTS PER CM2

1E-2
SA727-8M2 (@1.2 watts)
SA1037-8M2 (@ 2.0 watts)
SA10510-8M2 (@ 2.7 watts)
1E-3

1E-3-25-20-15-10-505

10152025

POLAR ANGLE (degrees)
4

Average of values parallel and perpendicular to axis of element.

DC Intensity (@ 1170 K) vs. Distance

WATTS PER CM2

1E-0
SA727-8M2 (@ 1.2 watts)
SA1037-8M2 (@ 2.0 watts)
SA10510-8M2 (@ 2.7 watts)

1E-1

1E-2

1E-3

110AXIAL DISTANCE (inches)

Revision May 22, 2019

Page 4 of 7

From Deep UV to Mid-IR

Infrared Emitters – SA Series

An ITW Company

Window Spectral Transmission Options

TRANSMISSION (%)

100Sapphire(0.5 mm thick)Calcium Fluoride(1.0 mm thick)8060402000.1110100WAVELENGTH (µm)

Revision May 22, 2019

Page 5 of 7

From Deep UV to Mid-IR

An ITW Company

Infrared Emitters – SA Series

TO-5 Package
0.260
45.0°

0.50 MIN
0.040 MAX

0.031

0.040

2X Ø0.018 ±0.002
0.250
0.325 APERTURE
AØ0.200Ø0.360MOUNTING SURFACE

TO-8 Package
MOUNTING SURFACE
0.225

A0.3900.025 MAX

0.112

6X Ø0.060

2X Ø0.018 ±0.002

0.375
0.550 APERTURE

0.375

0.187

0.031

0.50 MIN

Ø0.600

45.0°

0.031

0.254

28.6°

f2

ELLLIPTICAL REFLECTOR

NUMERICAL APERTURE = 0.48

Revision May 22, 2019

Page 6 of 7

From Deep UV to Mid-IR

An ITW Company

Infrared Emitters – SA Series

Ordering Information
SA-XXXXX-YYY
SA – S Source, A Steady StateXXXXX – Filament and Foil Dimensions
YYY – Packaging and Window Options
SA727-5M2 (40095) Steady State Emitter 727 in TO5 Package with Sapphire Window
SA727-8M2 (40198) Steady State Emitter 727 in TO8 Package with Sapphire Window
SA1037-5M2 (40089) Steady State Emitter 1037 in TO5 Package with Sapphire Window
SA10510-8M2 (40092) Steady State Emitter 10510 in TO8 Package with Sapphire Window
SA727-5M3 (40096) Steady State Emitter 727 in TO5 Package with Calcium Fluoride Window
SA1037-5M3 (40090) Steady State Emitter 1037 in TO5 Package with Calcium Fluoride Window
SA10510-8M3 (40093) Steady State Emitter 10510 in TO8 Package with Calcium Fluoride Window

Specifications are subject to change without prior notice.

1260 Calle Suerte, Camarillo, California 93012
Phone: +1 805.499.0335 | Fax: +1 805.499.8108 | sales@optodiode.com | www.optodiode.com
Revision May 22, 2019

Page 7 of 7