SC1704-1R2 Equivalent & Substitute Parts

Part Overview

The SC1704-1R2 is a 1.2 µH unshielded surface mount inductor manufactured by Signal Transformer, rated for 1.7 A continuous current with a maximum DC resistance of 120mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and meets ROHS3 compliance requirements.

Substiute Parts

SC1704-1R2

Signal TransformerIn Stock: 767SC1704-1R2 Datasheet

Current PartRFQ

SDR0703-1R2ML

Bourns Inc.In Stock: 1088SDR0703-1R2ML Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC1704-1R2 is determined by the following critical parameters:

• Inductance Value: Must match 1.2 µH at 100 kHz test frequency
• Current Rating: Substitute must support minimum 1.7 A continuous current
• DC Resistance: Lower DCR values are acceptable; higher values may impact circuit performance
• Shielding Configuration: Unshielded topology must be maintained
• Mounting Type: Surface mount package required for PCB compatibility
• Operating Temperature Range: Must support -40°C to 125°C minimum
• Compliance Standards: ROHS3 compliance required

The SDR0703-1R2ML meets all substitution criteria with improved electrical characteristics, including higher current rating (2 A), lower DC resistance (47mOhm), and active product status.

Parameter Comparison

Engineering Selection Recommendations

The SDR0703-1R2ML is the qualified substitute for the obsolete SC1704-1R2. Selection is based on the following factors:

Product Status: The SC1704-1R2 is obsolete, while the SDR0703-1R2ML maintains active product status with ongoing manufacturer support and availability.

Electrical Compatibility: Both parts share identical inductance values (1.2 µH) and operating temperature ranges (-40°C to 125°C). The substitute provides superior electrical performance with higher current rating (2 A vs. 1.7 A), improved saturation current (3 A vs. 1.5 A), and significantly lower DC resistance (47mOhm vs. 120mOhm).

Compliance Alignment: Both components meet ROHS3 compliance requirements and maintain MSL 1 (Unlimited) moisture sensitivity ratings, ensuring regulatory continuity.

Physical Compatibility: Both parts are surface mount, unshielded inductors with nonstandard package dimensions suitable for equivalent PCB footprint placement.

Frequently Asked Questions (FAQ)

Q: Can the SDR0703-1R2ML directly replace the SC1704-1R2 in existing designs?

A: Yes. Both parts share the same inductance value (1.2 µH), operating temperature range (-40°C to 125°C), and unshielded surface mount configuration. The substitute provides improved electrical performance with higher current rating and lower DC resistance.

Q: What is the impact of the lower DC resistance in the SDR0703-1R2ML?

A: Lower DC resistance (47mOhm vs. 120mOhm) reduces resistive losses in the inductor, resulting in improved circuit efficiency and reduced heat generation. This is a beneficial characteristic for direct substitution.

Q: Are there packaging differences between these parts?

A: Both parts use nonstandard surface mount packages. The SC1704-1R2 measures 0.264" L x 0.220" W x 0.043" H (6.70mm x 5.60mm x 1.10mm). The SDR0703-1R2ML measures 0.256" L x 0.177" W x 0.106" H (6.50mm x 4.50mm x 2.70mm). Physical dimensions should be verified against PCB layout constraints.

Q: Does the inductance tolerance difference affect substitution?

A: The SDR0703-1R2ML has tighter tolerance (±20% vs. ±30%), which provides improved inductance accuracy. This is advantageous for circuit performance and does not prevent substitution.

Q: Are both parts RoHS compliant?

A: Yes. Both the SC1704-1R2 and SDR0703-1R2ML are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings.