SCRH127B-331 Equivalent & Substitute Parts

Part Overview

The SCRH127B-331 is a 330 µH shielded inductor manufactured by Signal Transformer, rated for 1.22 A continuous current with a maximum DC resistance of 640 mOhm. This surface mount component operates across the temperature range of -40°C to 125°C and is designed for applications requiring electromagnetic shielding in compact form factors. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while meeting application requirements for inductance value, current rating, and operating conditions.

Substiute Parts

SCRH127B-331

Signal TransformerIn Stock: 1055SCRH127B-331 Datasheet

Current PartRFQ

UP4B-331-R

Eaton - Electronics DivisionIn Stock: 974UP4B-331-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCRH127B-331 is determined by the following criteria:

Primary Electrical Parameters:

• Inductance value: 330 µH (within ±20% tolerance band)
• Current rating: minimum 1.22 A continuous
• DC resistance: maximum 640 mOhm
• Operating temperature range: minimum -40°C to 85°C overlap

Physical & Compliance Parameters:

• Surface mount package configuration
• RoHS compliance status
• Moisture sensitivity level MSL 1

The substitute part UP4B-331-R meets the core electrical specifications for inductance and current rating. However, differences in shielding configuration, DC resistance, and maximum operating temperature must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

SCRH127B-331 (Primary Selection): Use when electromagnetic shielding is required to minimize radiated emissions or susceptibility to external magnetic fields. The higher maximum operating temperature of 125°C supports applications in elevated thermal environments. RoHS3 compliance ensures compatibility with the most current environmental regulations.

UP4B-331-R (Substitute Selection): The UP4B-331-R provides equivalent inductance and lower DC resistance (580 mOhm vs. 640 mOhm), resulting in reduced power dissipation. However, this part is unshielded and has a reduced maximum operating temperature of 85°C. Use this substitute only in applications where electromagnetic shielding is not required and operating temperatures do not exceed 85°C. The continuous current rating of 1.1 A is below the SCRH127B-331 specification; verify that actual circuit current does not exceed 1.1 A.

Both parts maintain RoHS compliance and MSL 1 rating, supporting standard PCB assembly processes without moisture baking requirements.

Frequently Asked Questions (FAQ)

Q: Can UP4B-331-R replace SCRH127B-331 in all applications?

A: No. The UP4B-331-R is unshielded, whereas the SCRH127B-331 is shielded. Applications requiring EMI suppression or operating in magnetically noisy environments must use the shielded SCRH127B-331. Additionally, the maximum operating temperature of UP4B-331-R is 85°C compared to 125°C for SCRH127B-331.

Q: What is the impact of the 0.12 A lower current rating on UP4B-331-R?

A: The UP4B-331-R has a continuous current rating of 1.1 A versus 1.22 A for SCRH127B-331. Verify that your circuit current does not exceed 1.1 A. The saturation current of UP4B-331-R is 2 A, providing adequate margin above the continuous rating.

Q: Does the lower DC resistance of UP4B-331-R provide any advantage?

A: Yes. The 580 mOhm maximum DC resistance of UP4B-331-R is lower than the 640 mOhm of SCRH127B-331, resulting in reduced resistive losses and lower heat generation at rated current. This is beneficial in power-sensitive applications, provided other substitution criteria are met.

Q: Are both parts compatible with standard PCB assembly processes?

A: Yes. Both parts have MSL 1 (Unlimited) moisture sensitivity ratings and surface mount packaging, requiring no special moisture control or baking procedures during assembly.

Q: What compliance certifications apply to both parts?

A: Both SCRH127B-331 and UP4B-331-R are RoHS compliant. SCRH127B-331 specifically meets RoHS3 requirements. Both are classified as EAR99 for export control purposes.