TYS4012470M-10 Equivalent & Substitute Parts

Part Overview

The TYS4012470M-10 is a 47 µH shielded surface mount inductor manufactured by Laird-Signal Integrity Products. This component is rated for 370 mA continuous current with a maximum DC resistance of 1.1 Ohm and operates across the temperature range of -40°C to 125°C. The part is currently in active production status.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit alternative manufacturers meeting equivalent electrical and mechanical specifications. The TYS4012470M-10 has been identified with one qualified substitute that maintains functional compatibility within defined parameter tolerances.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Inductance	47	µH	Core electrical specification; must match within tolerance
Inductance Tolerance	±20%	%	Acceptable variation range for circuit operation
Current Rating	370	mA	Maximum continuous current; critical for thermal design
Current - Saturation (Isat)	350	mA	Point at which inductance degrades; defines operational ceiling
DC Resistance (DCR)	1.1	Ohm Max	Power loss and thermal characteristics
Shielding	Shielded	—	Electromagnetic interference containment
Frequency - Self Resonant	12	MHz	Upper frequency limit for linear operation
Mounting Type	Surface Mount	—	PCB assembly compatibility
Size / Dimension	4.00 x 4.00	mm	Physical footprint and board layout constraint
Height - Seated (Max)	1.20	mm	Clearance and stacking height in assembly
Operating Temperature Range	-40 to 125	°C	Environmental and thermal performance envelope
RoHS Status	ROHS3 Compliant	—	Regulatory compliance requirement
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—	Handling and storage requirements

Substitute Part Grouping Explanation

Substitution eligibility for the TYS4012470M-10 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Inductance value: 47 µH at 100 kHz test frequency
Inductance tolerance: ±20% (matching specification)
Current rating: 370 mA minimum
Saturation current (Isat): 350 mA minimum
DC resistance: Must not exceed 1.1 Ohm maximum to maintain thermal and efficiency characteristics
Self-resonant frequency: 12 MHz minimum
Shielding: Shielded construction required

Mechanical Equivalence Requirements:

Mounting type: Surface Mount only
Physical dimensions: 4.00 mm × 4.00 mm footprint
Maximum seated height: 1.20 mm
Package case: Nonstandard (4012 form factor)

Compliance & Environmental Requirements:

RoHS3 compliance mandatory
Moisture Sensitivity Level: MSL 1 (Unlimited)
Operating temperature range: Must support -40°C to 125°C minimum
REACH unaffected status

The substitute part NR4012T470M meets all electrical and mechanical equivalence criteria. Variations in DC resistance (1.2 Ohm maximum versus 1.1 Ohm maximum) and operating temperature range (-25°C to 120°C versus -40°C to 125°C) represent acceptable deviations within engineering tolerance for most applications, though design-specific thermal or extreme-temperature requirements must be evaluated independently.

Parameter Comparison

Parameter	TYS4012470M-10 (Main)	NR4012T470M (Substitute)	Match Status
Manufacturer	Laird-Signal Integrity Products	Taiyo Yuden	Different manufacturer
Inductance	47 µH	47 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating	370 mA	370 mA	Equivalent
Current - Saturation (Isat)	350 mA	350 mA	Equivalent
DC Resistance (DCR)	1.1 Ohm Max	1.2 Ohm Max	Within tolerance (0.1 Ohm variance)
Shielding	Shielded	Shielded	Equivalent
Frequency - Self Resonant	12 MHz	12 MHz	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Size / Dimension	4.00 x 4.00 mm	4.00 x 4.00 mm	Equivalent
Height - Seated (Max)	1.20 mm	1.20 mm	Equivalent
Operating Temperature Range	-40°C to 125°C	-25°C to 120°C	Substitute range is narrower
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Equivalent
Product Status	Active	Not For New Designs	Different lifecycle status

Engineering Selection Recommendations

Primary Part Selection (TYS4012470M-10): The TYS4012470M-10 is the preferred selection for new designs. This component carries Active product status from Laird-Signal Integrity Products, ensuring continued manufacturing support, supply availability, and long-term component lifecycle stability. The part meets all current regulatory requirements including ROHS3 compliance and REACH unaffected status. The extended operating temperature range (-40°C to 125°C) provides maximum environmental flexibility for applications requiring extreme temperature operation.

Substitute Part Selection (NR4012T470M): The NR4012T470M from Taiyo Yuden is qualified as an electrical and mechanical substitute when the primary part experiences supply unavailability. This part maintains functional equivalence across all critical electrical parameters: 47 µH inductance, 370 mA current rating, 350 mA saturation current, and 12 MHz self-resonant frequency. The physical footprint (4.00 × 4.00 mm) and height (1.20 mm maximum) are identical, ensuring direct PCB layout compatibility.

Critical Considerations for Substitution:

The NR4012T470M carries "Not For New Designs" product status. This designation indicates the manufacturer is not actively promoting this component for new circuit development, though existing inventory remains available. Selection of this substitute should be limited to situations where supply constraints on the primary part create operational necessity.

The DC resistance specification differs by 0.1 Ohm (1.2 Ohm maximum for NR4012T470M versus 1.1 Ohm maximum for TYS4012470M-10). This variance results in marginally higher power dissipation and thermal generation. For applications operating at or near the 370 mA current rating, thermal modeling must confirm that the additional 0.1 Ohm resistance does not exceed thermal design margins.

The operating temperature range for NR4012T470M is -25°C to 120°C, which is narrower than the primary part's -40°C to 125°C range. Applications requiring operation below -25°C or above 120°C must use the TYS4012470M-10.

Both parts are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, ensuring equivalent handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can NR4012T470M be used as a direct replacement for TYS4012470M-10 in existing assemblies?

A: Yes, from an electrical and mechanical standpoint. Both components share identical inductance (47 µH), current rating (370 mA), saturation current (350 mA), physical dimensions (4.00 × 4.00 mm), and height (1.20 mm maximum). The footprint and mounting type are identical, permitting direct PCB substitution without layout modification. However, the DC resistance difference (1.2 Ohm versus 1.1 Ohm) and narrower operating temperature range (-25°C to 120°C versus -40°C to 125°C) must be evaluated against specific application requirements.

Q: What is the significance of the 0.1 Ohm difference in DC resistance?

A: DC resistance directly affects power dissipation and thermal performance. At the maximum current rating of 370 mA, the TYS4012470M-10 dissipates 150.7 mW (0.3707² × 1.1), while the NR4012T470M dissipates 164.3 mW (0.3707² × 1.2). This represents an 8.9% increase in power loss. For applications operating continuously at or near 370 mA, this additional thermal generation may require verification against thermal design limits. For applications operating at lower current levels, the difference becomes negligible.

Q: Why does the NR4012T470M have "Not For New Designs" status?

A: "Not For New Designs" status indicates that the manufacturer (Taiyo Yuden) is not actively promoting this component for new circuit development. This typically reflects strategic product portfolio decisions rather than technical deficiency. The part remains functionally qualified and available from existing inventory. New designs should prioritize the TYS4012470M-10 to ensure long-term supply continuity and manufacturer support.

Q: Are there packaging differences between these parts?

A: Yes. The TYS4012470M-10 is supplied in Tape & Reel (TR) packaging, while the NR4012T470M is supplied in Cut Tape (CT) packaging. Tape & Reel packaging is optimized for high-volume automated assembly, while Cut Tape is suitable for lower-volume or manual assembly operations. This difference does not affect component functionality but may impact procurement logistics and assembly process compatibility.

Q: What is the operating temperature range limitation for NR4012T470M?

A: The NR4012T470M operates from -25°C to 120°C, compared to the TYS4012470M-10 range of -40°C to 125°C. The substitute part cannot be used in applications requiring operation below -25°C or above 120°C. Applications with extreme temperature requirements must use the primary part.

Q: Are both parts RoHS3 compliant?

A: Yes. Both TYS4012470M-10 and NR4012T470M are RoHS3 compliant and carry REACH unaffected status. Moisture Sensitivity Level is MSL 1 (Unlimited) for both components, indicating no special moisture handling requirements during storage or assembly.

Q: What is the inductance tolerance, and does it affect substitution?

A: Both parts carry ±20% inductance tolerance at 100 kHz test frequency. This means the actual inductance value can range from 37.6 µH to 56.4 µH while remaining within specification. This tolerance is inherent to the component design and does not differentiate between the primary and substitute parts. Circuit designs must account for this tolerance range in their inductance calculations.

Q: Can these parts be used interchangeably in high-frequency applications?

A: Both components have a self-resonant frequency of 12 MHz, which defines the upper frequency limit for linear inductor operation. Above this frequency, the component exhibits capacitive behavior rather than inductive behavior. For applications operating below 12 MHz, both parts are equivalent. Applications requiring operation above 12 MHz require different component selection.

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