SIR-34ST3F Equivalent & Substitute Parts

Part Overview

The SIR-34ST3F is an infrared (IR) emitter operating at 950nm wavelength, designed for through-hole mounting in T-1 package configuration. This component is classified as obsolete product status, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part delivers 100mA maximum forward current with 1.3V typical forward voltage and 4.6mW/sr radiant intensity at 50mA operation, suitable for IR transmission applications requiring 54° viewing angle characteristics.

Substiute Parts

SIR-34ST3F

Rohm SemiconductorIn Stock: 3690SIR-34ST3F Datasheet

Current PartRFQ

SIR-34ST3F

Rohm SemiconductorIn Stock: 3690SIR-34ST3F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SIR-34ST3F is determined by strict alignment across the following critical parameters:

• Wavelength: 950nm (exact match required)
• Current - DC Forward (If) (Max): 100mA (exact match required)
• Voltage - Forward (Vf) (Typ): 1.3V (exact match required)
• Radiant Intensity (Ie) Min @ If: 4.6mW/sr @ 50mA (exact match required)
• Viewing Angle: 54° (exact match required)
• Package / Case: T-1 (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -25°C ~ 85°C (exact match required)

All substitute parts must maintain identical electrical and mechanical specifications to ensure direct compatibility in existing circuit designs without modification.

Parameter Comparison

Engineering Selection Recommendations

The SIR-34ST3F is classified as obsolete product status. Component selection for replacement applications must prioritize parts maintaining identical electrical characteristics and mechanical form factor. The substitute part SIR-34ST3F demonstrates full parameter alignment with the original specification.

Both the main part and substitute maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current manufacturing environments. Moisture Sensitivity Level 1 (Unlimited) classification indicates no special moisture control requirements during storage or handling.

Selection between available inventory sources should be based on supply chain availability and lead time requirements, as all qualified parts meet identical performance and compliance criteria.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the SIR-34ST3F?

A: Substitute parts must match all critical parameters: 950nm wavelength, 100mA maximum forward current, 1.3V typical forward voltage, 4.6mW/sr radiant intensity at 50mA, 54° viewing angle, T-1 package, through-hole mounting, and -25°C to 85°C operating temperature range. Any deviation in these specifications disqualifies a part from direct substitution.

Q: Is the T-1 package compatible with existing PCB designs?

A: The T-1 through-hole package is a standard form factor for IR emitters. Existing PCB designs with T-1 footprints will accommodate substitute parts without modification, provided all electrical parameters remain identical.

Q: What is the significance of the 54° viewing angle specification?

A: The 54° viewing angle defines the half-angle cone within which radiant intensity meets the specified minimum of 4.6mW/sr. This parameter is critical for optical system design and cannot be altered without affecting system performance. Substitute parts must maintain this exact specification.

Q: Does the obsolete product status affect part availability?

A: Obsolete classification indicates the manufacturer has discontinued active production. Availability depends on existing inventory from authorized distributors. The provided inventory of 3660 pcs represents current stock; future availability cannot be guaranteed.

Q: Are there compliance considerations for substitute part selection?

A: Both the main part and all qualified substitutes maintain ROHS3 compliance and REACH unaffected status. These certifications satisfy current regulatory requirements for electronic component manufacturing and use in regulated markets.