SDP8436-003 Equivalent & Substitute Parts

Part Overview

The SDP8436-003 is an 880nm side view radial phototransistor manufactured by Honeywell Sensing and Productivity Solutions. This optical sensor is designed for applications requiring infrared detection at 880nm wavelength with a side view orientation and through-hole right angle mounting configuration. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Wavelength	880nm
Voltage - Collector Emitter Breakdown (Max)	30 V
Current - Collector (Ic) (Max)	17 mA
Current - Dark (Id) (Max)	100 nA
Power - Max	100 mW
Mounting Type	Through Hole, Right Angle
Orientation	Side View
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	Radial
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SDP8436-003 phototransistor is determined by alignment of the following critical parameters: wavelength specification, collector-emitter breakdown voltage, maximum power dissipation, mounting configuration, package type, and operating temperature range. Substitute parts must maintain the 880nm wavelength detection capability, 30V breakdown voltage rating, 100mW power rating, through-hole radial package configuration, and side view orientation. The dark current specification of 100nA maximum is a standard parameter across all candidates. Operating temperature range compatibility is evaluated based on application requirements within the specified bounds.

Parameter Comparison

Parameter	SDP8436-003 (Honeywell)	OED-ST-23G (Lumex)	PT928-6B-F (Everlight)	QSE133 (onsemi)
Wavelength	880nm	880nm	940nm	880nm
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	30 V	30 V
Current - Collector (Ic) (Max)	17 mA	4 mA	40 mA	Not Specified
Current - Dark (Id) (Max)	100 nA	100 nA	100 nA	100 nA
Wavelength	880nm	880nm	940nm	880nm
Viewing Angle	18°	60°	Not Specified	50°
Power - Max	100 mW	100 mW	100 mW	100 mW
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole
Orientation	Side View	Side View	Side View	Side View
Operating Temperature	-40°C ~ 85°C	-20°C ~ 100°C	-25°C ~ 85°C	-40°C ~ 100°C
Package / Case	Radial	Radial	Radial, Side View	Radial, Side View
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

Primary Substitute: QSE133 (onsemi)

The QSE133 phototransistor is the primary equivalent for the SDP8436-003. Both components operate at 880nm wavelength with identical 30V collector-emitter breakdown voltage and 100mW maximum power rating. The QSE133 maintains the through-hole radial side view package configuration and extends the operating temperature range to -40°C ~ 100°C, providing broader thermal compatibility. The QSE133 is ROHS3 compliant and REACH unaffected, with active product status and substantial inventory availability (20,400 units). The component is specified with a 50° viewing angle, which accommodates the original 18° specification.

Secondary Substitute: OED-ST-23G (Lumex Opto/Components Inc.)

The OED-ST-23G operates at 880nm wavelength with matching 30V breakdown voltage and 100mW power rating in a through-hole radial side view package. This component is ROHS3 compliant with active product status. The OED-ST-23G is rated for -20°C ~ 100°C operating temperature, which covers the original -40°C ~ 85°C range except at the lower temperature extreme. The maximum collector current is specified at 4mA, which is lower than the original 17mA specification. The 60° viewing angle exceeds the original 18° specification. This substitute is suitable for applications not requiring operation below -20°C.

Alternative Consideration: PT928-6B-F (Everlight Electronics Co Ltd)

The PT928-6B-F operates at 940nm wavelength rather than 880nm, representing a spectral shift of 60nm. While this component shares the 30V breakdown voltage, 100mW power rating, and through-hole radial side view package configuration, the wavelength difference may affect optical coupling efficiency and spectral response characteristics in the application circuit. The PT928-6B-F is ROHS3 compliant with active product status and maximum collector current of 40mA. This substitute is applicable only when the application circuit can accommodate 940nm wavelength operation.

Frequently Asked Questions (FAQ)

Q: Can the QSE133 directly replace the SDP8436-003 without circuit modifications?

A: The QSE133 maintains electrical compatibility through identical collector-emitter breakdown voltage (30V), dark current (100nA), and power rating (100mW). Both components feature through-hole radial side view packages. The QSE133 viewing angle of 50° encompasses the original 18° specification. Direct substitution is supported from an electrical and mechanical standpoint.

Q: What is the significance of the wavelength difference between the SDP8436-003 (880nm) and PT928-6B-F (940nm)?

A: Wavelength determines the spectral response of the phototransistor. The 60nm difference between 880nm and 940nm represents a shift in the infrared spectrum. Substitution with PT928-6B-F requires verification that the application's infrared source and optical coupling are compatible with 940nm detection. This substitute is not interchangeable for applications specifically designed for 880nm wavelength operation.

Q: How do viewing angle specifications affect substitution decisions?

A: The original SDP8436-003 specifies an 18° viewing angle. The QSE133 (50°) and OED-ST-23G (60°) provide wider viewing angles, which increase the field of view for infrared detection. Wider viewing angles are generally compatible with narrower angle applications, as they represent a superset of the detection capability. Applications requiring the specific 18° narrow angle should verify that the wider angle does not introduce unwanted ambient light interference.

Q: Is the OED-ST-23G suitable for applications operating at -40°C?

A: The OED-ST-23G is rated for -20°C ~ 100°C operating temperature, which does not extend to the original -40°C lower limit. Applications requiring operation at -40°C must use the QSE133, which is rated for -40°C ~ 100°C, or the original SDP8436-003 if available from inventory.

Q: What is the impact of the 4mA maximum collector current specification on the OED-ST-23G?

A: The OED-ST-23G specifies a maximum collector current of 4mA, compared to the original 17mA specification. This lower current rating may limit the output drive capability in applications requiring higher collector current. Circuit design must ensure that the application does not demand collector currents exceeding 4mA. The QSE133 does not specify a maximum collector current limitation, providing greater design flexibility.

Q: Are all substitute parts RoHS compliant?

A: The original SDP8436-003 is RoHS compliant. All three substitute parts (QSE133, OED-ST-23G, and PT928-6B-F) are ROHS3 compliant, which represents an updated RoHS standard. ROHS3 compliance is compatible with RoHS compliant applications.

Q: What inventory considerations apply to these substitute parts?

A: The QSE133 has the highest inventory availability at 20,400 units. The PT928-6B-F has 808 units in stock, and the OED-ST-23G has 858 units. The original SDP8436-003 has 752 units available as new original stock. Inventory levels should be evaluated based on production volume and supply chain requirements.

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