SFH 757 Fiber Optic Transmitter - Equivalent & Substitute Parts

Part Overview

The SFH 757 is a fiber optic transmitter operating at 650nm wavelength, manufactured by Infineon Technologies. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The SFH 757 delivers 50 mA maximum forward current at 2.1V typical forward voltage, designed for applications requiring red-spectrum optical transmission in fiber optic communication systems.

Substiute Parts

SFH 757

Infineon TechnologiesIn Stock: 960SFH 757 Datasheet

Current PartRFQ

HFBR-1527Z

Broadcom LimitedIn Stock: 2865HFBR-1527Z Datasheet

MFR RecommendedRFQ

IF-E98

Industrial Fiber OpticsIn Stock: 1643IF-E98 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SFH 757 is determined by alignment across the following critical parameters: wavelength (650nm), forward voltage (2.1V nominal), and reverse voltage rating (3V maximum). The SFH 757 operates within a 25nm spectral bandwidth and carries a 30 pF capacitance specification.

Two substitute parts meet the core wavelength and voltage requirements:

HFBR-1527Z (Broadcom Limited) maintains identical wavelength (650nm) and forward voltage (2.1V), with higher maximum forward current (80 mA) and tighter spectral bandwidth (21nm). This part is active and RoHS3 compliant, packaged in Tube format with Versatile Link connector type.

IF-E98 (Industrial Fiber Optics) operates at 650nm wavelength with slightly elevated forward voltage (2.3V) and reduced maximum forward current (40 mA). This part features connector-less design, higher reverse voltage rating (5V), and is active with RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

HFBR-1527Z is the primary substitute for applications requiring direct electrical compatibility. This part maintains identical forward voltage (2.1V) and reverse voltage (3V) specifications, ensuring circuit-level compatibility without redesign. The higher maximum forward current (80 mA) provides operational margin. Active product status and RoHS3 compliance support long-term availability and regulatory alignment. The Versatile Link connector type requires mechanical interface verification against original system design.

IF-E98 serves as an alternative for applications tolerating forward voltage variation (2.3V vs. 2.1V) and reduced maximum current (40 mA). The connector-less design eliminates mechanical interface dependencies. Higher reverse voltage rating (5V) provides additional circuit protection margin. RoHS3 compliance and active status ensure supply continuity. This option requires circuit validation for the 0.2V forward voltage increase.

Both substitutes maintain 650nm wavelength operation and are RoHS3 compliant, addressing regulatory requirements absent in the obsolete SFH 757.

Frequently Asked Questions (FAQ)

Q: Can HFBR-1527Z directly replace SFH 757 without circuit modification?

A: HFBR-1527Z maintains identical forward voltage (2.1V) and reverse voltage (3V) specifications. Mechanical interface compatibility depends on connector type requirements; HFBR-1527Z uses Versatile Link connector while SFH 757 connector type is not specified. Electrical circuit redesign is not required.

Q: What is the impact of IF-E98's 2.3V forward voltage compared to SFH 757's 2.1V?

A: The 0.2V increase in forward voltage will alter current-limiting resistor calculations and power dissipation characteristics. Circuit validation is required to confirm acceptable performance within the application's voltage tolerance band.

Q: How do spectral bandwidth differences affect substitution?

A: SFH 757 operates at 25nm spectral bandwidth, while HFBR-1527Z operates at 21nm and IF-E98 at 20nm. Narrower bandwidth in substitutes provides improved spectral purity. This change is compatible with systems designed for 650nm operation and does not prevent substitution.

Q: What packaging considerations apply to these substitutes?

A: HFBR-1527Z is supplied in Tube packaging; IF-E98 is supplied in Bulk packaging. Original SFH 757 packaging is not specified. Verify packaging compatibility with assembly and handling processes.

Q: Are both substitutes suitable for new designs?

A: Both HFBR-1527Z and IF-E98 carry Active product status and RoHS3 compliance, supporting long-term design implementation. Selection depends on connector type requirements (Versatile Link vs. connector-less) and forward voltage tolerance.