EMI-1812-125 Equivalent & Substitute Parts

Part Overview

The EMI-1812-125 is a ferrite bead filtering component manufactured by API Delevan Inc. in the 1812 (4532 Metric) surface mount package format. This component provides electromagnetic interference (EMI) suppression with a nominal impedance of 120 Ohms at 100 MHz across a single line topology.

The EMI-1812-125 has reached obsolete status in the product lifecycle. Identifying suitable substitute parts with equivalent electrical and mechanical specifications is necessary to maintain circuit design compatibility and support ongoing manufacturing requirements.

Key Parameters

Parameter	Value
Impedance @ Frequency	120 Ohms @ 100 MHz
Number of Lines	1
Current Rating (Max)	200 mA
DC Resistance (DCR) (Max)	400 mOhm
Package / Case	1812 (4532 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Size / Dimension	0.177" L x 0.126" W (4.50 mm x 3.20 mm)
Height (Max)	0.069" (1.75 mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the EMI-1812-125 are identified based on matching the following critical electrical and mechanical parameters:

Impedance specification: 120 Ohms @ 100 MHz
Single-line topology: Number of lines = 1
Current handling capacity: 200 mA maximum
DC resistance: 400 mOhm maximum
Package format: 1812 (4532 Metric) surface mount
Operating temperature range: -55°C to 125°C
Physical dimensions and height: 0.177" L x 0.126" W, 0.069" max height

Both identified substitute parts match these parameters exactly, enabling direct substitution at the circuit level without design modifications.

Parameter Comparison

Parameter	EMI-1812-125	EMI1812R-125	ILBB1812ER121V
Manufacturer	API Delevan Inc.	API Delevan Inc.	Vishay Dale
Impedance @ Frequency	120 Ohms @ 100 MHz	120 Ohms @ 100 MHz	120 Ohms @ 100 MHz
Number of Lines	1	1	1
Current Rating (Max)	200 mA	200 mA	200 mA
DC Resistance (DCR) (Max)	400 mOhm	400 mOhm	400 mOhm
Package / Case	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Size / Dimension	0.177" L x 0.126" W (4.50 mm x 3.20 mm)	0.177" L x 0.126" W (4.50 mm x 3.20 mm)	0.177" L x 0.126" W (4.50 mm x 3.20 mm)
Height (Max)	0.069" (1.75 mm)	0.069" (1.75 mm)	0.069" (1.75 mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The EMI-1812-125 has been discontinued and classified as obsolete. Both identified substitute parts are currently in active production status, making them suitable for new designs and ongoing production support.

EMI1812R-125 (API Delevan Inc.): This substitute maintains the original manufacturer lineage while providing ROHS3 compliance. The part remains within the same manufacturer family (EMI1812 series, revised as EMI1812R) and is recommended when supply chain continuity with API Delevan products is preferred.

ILBB1812ER121V (Vishay Dale): This alternative from Vishay Dale offers cross-manufacturer compatibility with ROHS3 compliance and higher inventory availability (1017 units in stock). Selection of this part is appropriate when multi-source supply strategies are desired or when Vishay Dale components are preferred in the bill of materials.

Both substitutes eliminate RoHS compliance concerns present in the original obsolete part, supporting modern manufacturing and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can EMI1812R-125 or ILBB1812ER121V be used as direct drop-in replacements for EMI-1812-125?

A: Yes. Both substitute parts match the EMI-1812-125 across all critical electrical parameters (120 Ohms @ 100 MHz impedance, 200 mA current rating, 400 mOhm maximum DC resistance) and mechanical specifications (1812 package, surface mount, identical dimensions and height). No circuit redesign or board layout modifications are required.

Q: What is the primary difference between the two substitute options?

A: EMI1812R-125 is manufactured by API Delevan Inc., the same original manufacturer of the obsolete part, while ILBB1812ER121V is manufactured by Vishay Dale. Both achieve identical electrical performance and comply with ROHS3 requirements. The selection depends on supply chain strategy and manufacturer preference.

Q: Are there any compliance or regulatory differences between substitutes and the original part?

A: The original EMI-1812-125 is RoHS non-compliant, while both substitutes (EMI1812R-125 and ILBB1812ER121V) carry ROHS3 compliance certifications. This makes the substitutes more suitable for applications subject to modern environmental and regulatory standards.

Q: Does package compatibility extend to automated assembly equipment?

A: Yes. All three parts share the identical 1812 (4532 Metric) surface mount package format with matching tape and reel (TR) packaging. Board layouts, pick-and-place programming, and reflow profiles do not require adjustment when transitioning from EMI-1812-125 to either substitute.

Q: Is there a difference in moisture sensitivity handling?

A: No. All three parts carry MSL Level 1 (Unlimited) moisture sensitivity ratings, indicating equivalent moisture handling requirements and storage specifications across the entire product line.

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