From Deep UV to Mid-IR

An ITW CompanyIR Detectors – A SeriesHigh Sensitivity Lead Sulfide (PbS) Single Channel
Uncooled and Cooled Devices
KEY FEATURES• Highest Sensitivity in 1-3 Micron Region• Provides High Signal to Noise Performance for
Wide Measurement Dynamic Range• High Durability Ensures Long Operation in the Field• Minimizes Maintenance and Repair Costs• Multiple Flat Panel, Cooled, and Uncooled Package Options

The A Series single channel infrared detectors
integrates PbS technology with proven manufacturing
processes to provide the highest sensitivity detectors
across the spectral range from one to three microns.
In addition, the product line minimizes maintenancecosts and provides dependable operation withindustry leading quality, durability, and reliability.
Many of today's demanding applications including
industrial, environmental, and medical uses require ahigh level of performance. The A Series IR Detectors
provide a higher level of sensitivity in a tighter spectral
band meeting the challenge to detect trace elements,gases, fire, flame, and emissions.
Available in a variety of standard configurations,customers can choose from an assortment of optionsincluding, element size, cooling alternatives andpackage size to suit numerous system andapplication requirements. Cooled units provide
additional sensitivity for very low-level signal
detection and enhanced stability for environments
where temperatures are in constant flux.

Revision September 30, 2021

Opto Diode has been manufacturing and selling highperformance PbS and PbSe infrared detectors forover 25 years. Having established a reputation forhighlycontrolled
manufacturing
processes,
customers can rely on consistent, repeatableperformance and superior customer service. Opto
Diode works with customers from prototype toproduction to help deliver valuable instruments.
Custom requirements can be addressed bycontacting the Opto Diode sales team.
Applications• Gas analysis– Medical– Industrial• Emissions monitoring• Spectroscopy• Process control systems• Thermal imaging• Flame Monitoring and Detection

Page 1 of 8

From Deep UV to Mid-IR

An ITW Company

IR Detectors – A SeriesHigh Sensitivity Lead Sulfide (PbS) Single Channel
Uncooled and Cooled Devices

A Series Specifications

Model #Part #Description - Size

Package TypeAP Series - Uncooled PbS Packaged IR DetectorsActive
Element Area(mm2)ElementOperating
Temp.
(°C)

Peak
Sensitivity
Wavelengthʎp (µm)D*
ʎp, 650 Hz,1Hz(cm HZ1/2 W-1)

Typ.

Ambient 23

Min.

Min.

Typ.

Typ.

Responsivity1
ʎp, 650 Hz,
25-50 V/mm
(V/W)

Resistance
(MΩ)

Min.

Range

Time Constant(µsec)
Typ.

Max.

Window
Type

Absolute Ratings
Storage &Operating
Temperature(°C)2,3Range

AP-15G

40725

1 mm x 1 mm

TO51+232.2

2.4

8x10101x1011

5.3x105

0.5-2.0200

400

Glass Molded
Lens4

AP-25G40370

2 mm x 2 mm

TO54+232.22.48x1010

1x1011

2.7x105

0.5-2.0200

400

Glass Molded
Lens4-40 to +65

AP-3540363

3 mm x 3 mm

TO59+232.22.48x1010

1x1011

1.7x1050.5-2.0200

400

Glass Molded
Lens4-40 to +65

AP-20505

40009

2 mm x 5 mm

TO510+232.2

2.47x1010-

8.0x104

0.5-2.0200

400

Flat Glass4-40 to +6510-

1.1x1050.5-2.0200

400

Flat Si-40 to +65-

9.0x104

0.5-2.0200

400

Flat Si-40 to +65

AP-58E40736

5 mm x 5 mm

TO825+232.22.47x10AP-6840368

6 mm x 6 mm

TO836+232.2

2.47x1010

AT1 Series - One Stage Cooled PbS Packaged IR Detectors-40 to +65

Typ.

Ambient 25

Min.

Typ.

Min.

Typ.

Min.

Range

Typ.

Max.

AT1-27TE

40373

2 mm x 2 mm

TO37

4-25

2.4

2.5

1x1011

1.5x1011

6.3x105

1.5-10.0

800

1600

Flat Sapphire-40 to +85

AT1-37T

40147

3 mm x 3 mm

TO37

9-25

2.4

2.5

1x1011

1.5x1011

4.2x105

1.5-10.0800

1600

Flat Sapphire-40 to +85

Min.

Typ.

AT2 Series - Two Stage Cooled PbS Packaged IR Detectors

Range

Typ.

Ambient 25Min.

Typ.

Min.

Range

Typ.

Max.

AT2-28TE

40028

2 mm x 2 mm

TO84-35

2.52.61.5x1011 2.5x1011

6.6x105

2.5-15.01250

2500

Flat Sapphire-40 to +85

AT2-37T

40193

3 mm x 3 mm

TO379-35

2.52.61.5x1011 2.5x1011

4.3x105

2.5-15.01250

2500

Flat Sapphire-40 to +8556.0-20.0

1750

3500

Flat Sapphire-40 to +85

AT2S-38T

40029

3 mm x 3 mm

TO89-452.6

2.72x10113x10115.18x10

Range

1 Specifications apply at a bias voltage of 50 V/mm directly across the detector with a 1 MΩ load resistor in series. Except 40009 uses a 0.5 MΩ load. lpk 500°k
2 Specifications apply at maximum cooling with a heat sink at +25 °C. Typical cooler power at max cooling: AT1 0.8 V @ 1.5 A, AT2 0.8 V 1.2 A, AT2S 1.9 V @ 1.2 A.
3 Max rated element temperature is 65 °C.
4 Borosilicate glass.

Revision September 30, 2021

Page 2 of 8

From Deep UV to Mid-IR

IR Detectors – A SeriesHigh Sensitivity Lead Sulfide (PbS) Single Channel
Uncooled and Cooled Devices

An ITW Company

Detector Spectral Response

Relative D* Values

10PbS–25C0C25C50C

1PbSe

50C25C0C

0.1

–25C

0.01

S/N vs Bias Voltage

0123Wavelength (µm)

4580

870

760

6Signal

50

540

4
S/N

30

3202
Noise100

Revision September 30, 2021

Noise (µV)

R Signal (µV)

610102030
40
Bias (VDC)

5060700Page 3 of 8

From Deep UV to Mid-IRAn ITW Company

IR Detectors – A SeriesHigh Sensitivity Lead Sulfide (PbS) Single ChannelUncooled and Cooled Devices

TO5 Packages
Package and Pin Out Information
Pin No.
123Function
Detector
Case GndDetector

Color
BareBareBare

40370

40363

Revision September 30, 2021

Page 4 of 8

From Deep UV to Mid-IR

An ITW Company

IR Detectors – A SeriesHigh Sensitivity Lead Sulfide (PbS) Single Channel
Uncooled and Cooled Devices

40009

40725

40029

Revision September 30, 2021

Page 5 of 8

From Deep UV to Mid-IR

An ITW Company

IR Detectors – A SeriesHigh Sensitivity Lead Sulfide (PbS) Single Channel
Uncooled and Cooled Devices

TO8 Packages
40029
Pin No.
149101112Function
Cooler (–)
Cooler (+)
Detector
Thermistor
Thermistor
Detector

Pin No.
1912Function
Detector
Detector
Gnd (Case)

Color
BlackRedWhite
Yellow
Yellow
White

40368

Revision September 30, 2021

Color
BareBareBare

Page 6 of 8

From Deep UV to Mid-IR

An ITW Company

IR Detectors – A SeriesHigh Sensitivity Lead Sulfide (PbS) Single Channel
Uncooled and Cooled Devices

40028
Pin No.
149101112Function
Cooler (–)
Cooler (+)
Detector
Thermistor
Thermistor
Detector

Pin No.
19Function
Detector
Detector

Color
BlackRedWhite
Yellow
YellowWhite40736

Revision September 30, 2021

Color
BareBarePage 7 of 8

From Deep UV to Mid-IRAn ITW Company

IR Detectors – A SeriesHigh Sensitivity Lead Sulfide (PbS) Single Channel
Uncooled and Cooled Devices

TO37 Packages
Pin No.
126789Function
Thermistor
Thermistor
Detector
Detector
Cooler (–)
Cooler (+)

Color
Yellow
YellowWhiteWhiteBlackRed

40147, 40373

40193

1260 Calle Suerte, Camarillo, California 93012
Phone: +1 805.499.0335 | Fax: +1 805.499.8108 | sales@optodiode.com | www.optodiode.com
Revision September 30, 2021

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