L14G2 Phototransistor 880nm TO-206AA Equivalent & Substitute Parts

Part Overview

The L14G2 is an obsolete phototransistor manufactured by onsemi, designed for 880nm infrared detection in a TO-206AA metal can package. This component is a top-view phototransistor with a 20° viewing angle, rated for 45V collector-emitter breakdown voltage and 300mW maximum power dissipation. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and production continuity.

Key Parameters

Parameter	L14G2 Value
Wavelength	880nm
Package / Case	TO-206AA, TO-18-3 Metal Can
Mounting Type	Through Hole
Orientation	Top View
Voltage - Collector Emitter Breakdown (Max)	45V
Current - Dark (Id) (Max)	100nA
Power - Max	300mW
Viewing Angle	20°
Operating Temperature	-65°C ~ 125°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the L14G2 is determined by the following critical parameters:

Primary Compatibility Criteria:

Package / Case: TO-206AA, TO-18-3 Metal Can (mechanical fit)
Mounting Type: Through Hole (assembly compatibility)
Orientation: Top View (optical alignment)
Wavelength: 880nm ± tolerance range (functional sensitivity)
Current - Dark (Id) (Max): 100nA (leakage specification)

Secondary Compatibility Criteria:

Voltage - Collector Emitter Breakdown (Max): minimum 45V required
Power - Max: minimum 300mW required
Operating Temperature: must encompass -65°C ~ 125°C range

All substitute parts listed meet the primary compatibility criteria. The substitute parts operate at 850nm to 890nm wavelengths, which fall within the infrared detection spectrum for phototransistor applications. All substitutes maintain the same package, mounting type, and orientation as the L14G2.

Parameter Comparison

Part Number	Manufacturer	Wavelength	Voltage - Collector Emitter Breakdown (Max)	Current - Dark (Id) (Max)	Power - Max	Viewing Angle	Operating Temperature	Product Status
L14G2	onsemi	880nm	45V	100nA	300mW	20°	-65°C ~ 125°C	Obsolete
BPW77NB	Vishay Semiconductor Opto Division	850nm	70V	100nA	250mW	20°	-40°C ~ 125°C	Active
OP800A	TT Electronics / Optek Technology	890nm	30V	100nA	250mW	—	-65°C ~ 125°C	Active
OP800B	TT Electronics / Optek Technology	890nm	30V	100nA	250mW	—	-65°C ~ 125°C	Active
OP800C	TT Electronics / Optek Technology	890nm	30V	100nA	250mW	—	-65°C ~ 125°C	Active
OP804SL	TT Electronics / Optek Technology	890nm	30V	100nA	250mW	—	-65°C ~ 125°C	Active
OP804TX	TT Electronics / Optek Technology	890nm	30V	100nA	250mW	24°	-65°C ~ 125°C	Active
OP804TXV	TT Electronics / Optek Technology	890nm	30V	100nA	250mW	24°	-65°C ~ 125°C	Active
OP805SL	TT Electronics / Optek Technology	890nm	30V	100nA	250mW	—	-65°C ~ 125°C	Active
OP805TX	TT Electronics / Optek Technology	890nm	30V	100nA	250mW	24°	-65°C ~ 125°C	Active
OP805TXV	TT Electronics / Optek Technology	890nm	30V	100nA	250mW	24°	-65°C ~ 125°C	Active

Engineering Selection Recommendations

BPW77NB (Vishay): Active product with higher voltage rating (70V) and matching 20° viewing angle. Operating temperature range is limited to -40°C minimum, which does not cover the full -65°C lower bound of the L14G2. Power rating is 250mW, below the L14G2 specification of 300mW. Suitable for applications not requiring extended low-temperature operation.

OP800 Series (OP800A, OP800B, OP800C): Active products from TT Electronics / Optek Technology with 890nm wavelength and full -65°C ~ 125°C operating temperature range. Voltage rating is 30V, which is below the L14G2 specification of 45V. Power rating is 250mW. These parts are suitable for applications with lower voltage requirements and moderate power dissipation.

OP804 Series (OP804SL, OP804TX, OP804TXV): Active products with 890nm wavelength and full operating temperature range. OP804TX and OP804TXV feature 24° viewing angle, providing wider field of view than the L14G2. Voltage and power ratings match the OP800 series. OP804SL has unspecified viewing angle.

OP805 Series (OP805SL, OP805TX, OP805TXV): Active products with identical electrical and thermal specifications to the OP804 series. OP805TX and OP805TXV feature 24° viewing angle. Selection between OP804 and OP805 series depends on application-specific optical and sensitivity requirements not specified in the provided parameters.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can BPW77NB replace L14G2 in all applications?

A: BPW77NB is mechanically and functionally compatible but has two limitations: operating temperature minimum of -40°C (versus L14G2's -65°C) and power rating of 250mW (versus L14G2's 300mW). Applications requiring full temperature range or higher power dissipation require alternative substitutes.

Q: Why do OP800, OP804, and OP805 series have lower voltage ratings than L14G2?

A: The OP series phototransistors are rated for 30V collector-emitter breakdown, compared to L14G2's 45V. Applications operating above 30V require BPW77NB or circuit redesign to reduce operating voltage.

Q: What is the difference between OP804 and OP805 series?

A: Both series share identical electrical, thermal, and power specifications. The distinction between OP804 and OP805 base product numbers reflects different optical or sensitivity characteristics not detailed in the provided parameters. Consult manufacturer datasheets for specific application requirements.

Q: Are OP804TX/TXV and OP805TX/TXV interchangeable with OP804SL and OP805SL?

A: All variants within each series (OP804 or OP805) share identical electrical specifications. The primary difference is viewing angle: TX and TXV variants feature 24° viewing angle, while SL variants have unspecified viewing angle. Selection depends on optical field-of-view requirements.

Q: Do all substitute parts fit the same TO-206AA package footprint?

A: Yes. All substitute parts use TO-206AA, TO-18-3 Metal Can package with through-hole mounting and top-view orientation, ensuring mechanical compatibility with L14G2 PCB layouts.

Q: Which substitute offers the closest electrical match to L14G2?

A: BPW77NB provides the closest voltage rating match (70V versus L14G2's 45V) and identical 20° viewing angle. However, it has temperature range and power dissipation limitations. For full temperature range compatibility, OP800/OP804/OP805 series are required, accepting lower voltage ratings.

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