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SCRH124B-121 Equivalent & Substitute Parts
Part Overview
The SCRH124B-121 is a 120 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 1.23 A continuous current with a maximum DC resistance of 400mOhm. This component is designed for applications requiring fixed inductance in compact nonstandard packages and is currently in active production status with 631 pieces available in stock.
Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit operation within the specified parameter tolerances of alternative qualified inductors.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Inductance | 120 | µH |
| Inductance Tolerance | ±20% | % |
| Current Rating | 1.23 | A |
| Saturation Current (Isat) | 1.1 | A |
| DC Resistance (DCR) Maximum | 400 | mOhm |
| Shielding | Shielded | — |
| Mounting Type | Surface Mount | — |
| Package Dimensions | 12.50 × 12.50 mm | L × W |
| Height (Seated Maximum) | 4.80 | mm |
| Operating Temperature Range | -40 to 125 | °C |
| Test Frequency | 100 | kHz |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
The DR124-121-R from Eaton - Electronics Division qualifies as a direct substitute for the SCRH124B-121 based on the following critical parameters:
- Identical inductance value: 120 µH at 100 kHz test frequency
- Identical inductance tolerance: ±20%
- Compatible current rating: 1.3 A (exceeds the 1.23 A requirement)
- Superior saturation current: 1.65 A (exceeds the 1.1 A specification)
- Lower DC resistance: 373.4 mOhm maximum (improves upon the 400 mOhm maximum)
- Identical shielding classification: Shielded
- Identical mounting type: Surface Mount
- Identical package footprint: 12.50 × 12.50 mm
- Compatible height: 4.50 mm seated maximum (within tolerance of 4.80 mm)
- Matching operating temperature range: -40 to 125°C
- Equivalent compliance: ROHS3 Compliant, MSL 1
Parameter Comparison
| Parameter | SCRH124B-121 (Signal Transformer) | DR124-121-R (Eaton) | Compatibility |
|---|---|---|---|
| Inductance | 120 µH | 120 µH | Identical |
| Inductance Tolerance | ±20% | ±20% | Identical |
| Current Rating | 1.23 A | 1.3 A | Compatible (higher rating) |
| Saturation Current (Isat) | 1.1 A | 1.65 A | Compatible (higher rating) |
| DC Resistance Maximum | 400 mOhm | 373.4 mOhm | Compatible (lower resistance) |
| Shielding | Shielded | Shielded | Identical |
| Mounting Type | Surface Mount | Surface Mount | Identical |
| Package Dimensions | 12.50 × 12.50 mm | 12.50 × 12.50 mm | Identical |
| Height (Seated Maximum) | 4.80 mm | 4.50 mm | Compatible (lower profile) |
| Operating Temperature | -40 to 125°C | -40 to 125°C | Identical |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Identical |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | Identical |
Engineering Selection Recommendations
The DR124-121-R is qualified as a direct substitute based on electrical parameter equivalence and regulatory compliance alignment. Both components maintain ROHS3 compliance and identical moisture sensitivity classification, ensuring equivalent environmental performance across the specified operating temperature range of -40 to 125°C.
The substitute part demonstrates superior electrical performance characteristics: increased current rating capacity (1.3 A versus 1.23 A), higher saturation current margin (1.65 A versus 1.1 A), and reduced DC resistance (373.4 mOhm versus 400 mOhm maximum). These improvements provide additional design margin without introducing incompatibility.
Mechanical compatibility is confirmed through identical footprint dimensions (12.50 × 12.50 mm) and compatible height profile (4.50 mm versus 4.80 mm seated maximum), permitting direct PCB layout substitution without redesign.
Frequently Asked Questions (FAQ)
Q: Can the DR124-121-R be used as a direct replacement for the SCRH124B-121 in existing designs?
A: Yes. Both components share identical inductance values (120 µH), tolerance specifications (±20%), shielding classification, surface mount configuration, and package footprint (12.50 × 12.50 mm). The substitute part meets or exceeds all electrical ratings of the original component.
Q: What are the key differences between these two inductors?
A: The primary differences are manufacturer-specific: Signal Transformer SCRH124B-121 versus Eaton DR124-121-R. The Eaton substitute provides higher current rating (1.3 A versus 1.23 A), higher saturation current (1.65 A versus 1.1 A), and lower DC resistance (373.4 mOhm versus 400 mOhm). Both maintain identical operating temperature range and compliance certifications.
Q: Are there any height clearance concerns when substituting the DR124-121-R?
A: No. The DR124-121-R seated height maximum is 4.50 mm, which is lower than the SCRH124B-121 specification of 4.80 mm. This provides additional clearance margin for PCB assembly and component placement.
Q: Do both parts have the same RoHS and moisture sensitivity ratings?
A: Yes. Both the SCRH124B-121 and DR124-121-R are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), ensuring equivalent environmental performance and handling requirements.
Q: What is the inductance test frequency for these components?
A: Both inductors are tested and specified at 100 kHz, ensuring consistent inductance measurement methodology across the substitution pair.
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