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SCRH125-680 Equivalent & Substitute Parts
Part Overview
The SCRH125-680 is a 68 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications requiring 2 A current rating and 120mOhm maximum DC resistance. This component is classified as Active product status with full RoHS3 compliance. Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within the electrical and mechanical tolerances of alternative qualified inductors.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 68 µH |
| Inductance Tolerance | ±20% |
| Current Rating | 2 A |
| DC Resistance (DCR) | 120mOhm Max |
| Shielding | Shielded |
| Operating Temperature Range | -40°C ~ 125°C |
| Mounting Type | Surface Mount |
| Package Type | Nonstandard |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the SCRH125-680 is determined by the following criteria:
Electrical Parameters (Primary):
- Inductance value: 68 µH ±20%
- Current rating: minimum 2 A
- DC resistance: within acceptable operating limits for the application
- Shielding: shielded construction required
Mechanical Parameters (Secondary):
- Mounting type: surface mount
- Package classification: nonstandard
- Physical dimensions: compatible with PCB layout constraints
Compliance Parameters:
- RoHS3 compliance mandatory
- Operating temperature range: must support minimum -40°C ~ 100°C
The CDRH127NP-680MC from Sumida America Components Inc. meets all primary electrical and mechanical substitution criteria while maintaining regulatory compliance.
Parameter Comparison
| Parameter | SCRH125-680 (Main) | CDRH127NP-680MC (Substitute) |
|---|---|---|
| Manufacturer | Signal Transformer | Sumida America Components Inc. |
| Inductance | 68 µH | 68 µH |
| Inductance Tolerance | ±20% | ±20% |
| Current Rating (Amps) | 2 A | 2.1 A |
| DC Resistance (DCR) | 120mOhm Max | 140mOhm Max |
| Shielding | Shielded | Shielded |
| Operating Temperature Range | -40°C ~ 125°C | -40°C ~ 100°C |
| Inductance Test Frequency | 1 kHz | 1 kHz |
| Mounting Type | Surface Mount | Surface Mount |
| Package Type | Nonstandard | Nonstandard |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) |
| Packaging | Tape & Reel (TR) | Tape & Reel (TR) |
Engineering Selection Recommendations
SCRH125-680 (Primary Selection): Use when supply availability is confirmed and operating temperature requirements extend to 125°C. This part provides the lowest DC resistance specification at 120mOhm maximum, minimizing power dissipation in current-limited applications.
CDRH127NP-680MC (Substitute Selection): Use when SCRH125-680 availability is constrained or extended lead times impact project schedules. The substitute provides higher current rating headroom (2.1 A vs. 2 A) and maintains identical inductance and tolerance specifications. The maximum operating temperature of 100°C is suitable for applications not requiring the full 125°C upper limit of the primary part. The increased DC resistance of 140mOhm maximum must be evaluated for thermal and efficiency impact in the specific circuit application.
Both parts maintain Active product status, ROHS3 compliance, and MSL Level 1 rating, ensuring equivalent regulatory and environmental qualification.
Frequently Asked Questions (FAQ)
Q: Can CDRH127NP-680MC replace SCRH125-680 in all applications?
A: Substitution is valid when the application operating temperature does not exceed 100°C and the increased DC resistance of 140mOhm maximum is acceptable for the circuit design. The higher current rating of 2.1 A provides additional margin above the 2 A requirement of the primary part.
Q: What is the impact of the 20mOhm increase in DC resistance?
A: The CDRH127NP-680MC exhibits 20mOhm higher maximum DC resistance (140mOhm vs. 120mOhm). Power dissipation increases proportionally with I²R losses. At 2 A continuous current, this represents an additional 80mW maximum dissipation. Circuit thermal analysis must confirm acceptability for the specific application.
Q: Are the physical dimensions compatible?
A: Both parts are classified as nonstandard package type with surface mount mounting. SCRH125-680 measures 12.50mm × 12.50mm × 6.00mm maximum height. CDRH127NP-680MC measures 12.00mm × 12.00mm × 8.00mm maximum height. PCB layout must accommodate the 2mm height difference and the 0.5mm reduction in length and width.
Q: Do both parts meet the same compliance standards?
A: Both parts are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating. SCRH125-680 carries REACH Unaffected status. CDRH127NP-680MC lists REACH status as Vendor Undefined. Compliance verification with the component supplier is recommended for applications with specific REACH requirements.
Q: What is the inductance test frequency for both parts?
A: Both inductors are specified at 1 kHz test frequency, ensuring direct inductance value comparison between the two parts.
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