OP775C Equivalent & Substitute Parts

Part Overview

The OP775C is a 935nm phototransistor with side view radial packaging manufactured by TT Electronics/Optek Technology. This optical sensor is designed for infrared detection applications requiring through-hole mounting. The part is currently obsolete, making identification of compatible alternatives essential for ongoing system support and new design implementations.

Substiute Parts

OP775C

TT Electronics/Optek TechnologyIn Stock: 691OP775C Datasheet

Current PartRFQ

PT908-7C-F

Everlight Electronics Co LtdIn Stock: 45108PT908-7C-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OP775C is determined by the following critical parameters:

Mechanical Compatibility:

• Mounting Type: Through Hole
• Orientation: Side View
• Package / Case: Radial

Electrical Compatibility:

• Voltage - Collector Emitter Breakdown (Max): 30 V
• Current - Dark (Id) (Max): 100 nA
• Wavelength: Near-infrared range (935nm ± tolerance)

Environmental & Compliance:

• RoHS3 Compliance
• MSL Rating: 1 (Unlimited)

The PT908-7C-F qualifies as a substitute based on matching mechanical form factor (through-hole, side view, radial package), identical maximum breakdown voltage (30 V), identical dark current specification (100 nA), and near-infrared wavelength operation (940nm). Both parts maintain ROHS3 compliance and MSL 1 rating.

Parameter Comparison

Engineering Selection Recommendations

The PT908-7C-F is an active product from Everlight Electronics Co Ltd with established supply availability (45,076 pcs in stock). Both parts maintain identical ROHS3 compliance and MSL 1 ratings, ensuring regulatory and environmental compatibility.

The PT908-7C-F demonstrates higher maximum collector current (20 mA vs. 2.25 mA) and operates within a narrower temperature range (-25°C ~ 85°C vs. -40°C ~ 100°C). The wavelength difference of 5nm (940nm vs. 935nm) falls within the near-infrared spectrum and maintains compatibility with standard infrared detection applications.

Frequently Asked Questions (FAQ)

Q: Can PT908-7C-F directly replace OP775C in existing designs?

A: PT908-7C-F is mechanically and electrically compatible as a substitute. Both parts feature identical through-hole, side view, radial packaging and matching breakdown voltage and dark current specifications. The 5nm wavelength difference and higher maximum collector current do not preclude substitution in standard infrared detection circuits.

Q: What are the key differences between these parts?

A: The primary differences are wavelength (935nm vs. 940nm), maximum collector current (2.25 mA vs. 20 mA), and operating temperature range (-40°C ~ 100°C vs. -25°C ~ 85°C). The PT908-7C-F is an active product with higher current capacity, while the OP775C is obsolete.

Q: Are both parts RoHS compliant?

A: Yes. Both OP775C and PT908-7C-F are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Does the operating temperature range difference affect substitution?

A: The PT908-7C-F operates within -25°C ~ 85°C, which is narrower than the OP775C range of -40°C ~ 100°C. Applications requiring operation below -25°C or above 85°C require evaluation against specific system requirements.

Q: What is the significance of the higher collector current in PT908-7C-F?

A: The PT908-7C-F maximum collector current of 20 mA exceeds the OP775C specification of 2.25 mA. This provides greater current handling capacity and does not restrict substitution in circuits designed for the lower-current OP775C.