PM1608-470M Equivalent & Substitute Parts

Part Overview

The PM1608-470M is a 47 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 500 mA with a maximum DC resistance of 640 mOhm. This component operates across the temperature range of -40°C to 85°C and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary to maintain design continuity and ensure ongoing component availability for new production and field replacements.

Key Parameters

Parameter	Value
Inductance	47 µH
Current Rating	500 mA
DC Resistance (DCR)	640 mOhm Max
Tolerance	±20%
Core Type	Ferrite Drum Core
Shielding	Unshielded
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Physical Dimensions	0.260" L x 0.175" W (6.60mm x 4.45mm)
Height (Seated Max)	0.115" (2.92mm)

Substitute Part Grouping Explanation

Substitution eligibility for the PM1608-470M is determined by the following critical parameters:

Primary Substitution Criteria:

Inductance value: 47 µH (exact match required)
Current rating: minimum 500 mA
DC resistance: maximum 640 mOhm
Core material: Ferrite
Mounting type: Surface Mount
Physical footprint compatibility: 6.60mm x 4.45mm length and width tolerance

Classification Logic:

Direct Equivalents meet all primary criteria with identical electrical performance and physical compatibility. The SDR6603-470M qualifies as a direct equivalent, offering identical inductance, current rating, and DC resistance specifications with active product status and improved temperature range (-40°C to 125°C).

Similar Substitutes maintain the 47 µH inductance and ferrite core construction but present trade-offs in current rating or DC resistance. The SDR0703-470KL operates at 400 mA (below the 500 mA requirement) with 720 mOhm DCR. The ASPI-0428S-470M-T provides shielded construction (versus unshielded) at 480 mA with 587 mOhm DCR. The P0770.473NL matches electrical specifications but uses unspecified core material.

Non-Equivalent Parts do not meet substitution criteria. The CM453232-1R5KL operates at 1.5 µH inductance, which is incompatible with the 47 µH requirement and represents a fundamentally different circuit function.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating (mA)	DCR Max (mOhm)	Tolerance	Shielding	Operating Temp	Product Status	RoHS Status
PM1608-470M	Bourns Inc.	47 µH	500	640	±20%	Unshielded	-40°C ~ 85°C	Obsolete	Non-compliant
SDR6603-470M	Bourns Inc.	47 µH	500	640	±20%	Unshielded	-40°C ~ 125°C	Active	ROHS3 Compliant
SDR0703-470KL	Bourns Inc.	47 µH	400	720	±10%	Unshielded	-40°C ~ 125°C	Active	ROHS3 Compliant
ASPI-0428S-470M-T	Abracon LLC	47 µH	480	587	±20%	Shielded	-40°C ~ 85°C	Active	ROHS3 Compliant
P0770.473NL	Pulse Electronics	47 µH	500	640	±20%	Unshielded	-40°C ~ 130°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitute: SDR6603-470M

The SDR6603-470M is the optimal replacement for the obsolete PM1608-470M. This Bourns Inc. component maintains identical electrical specifications (47 µH, 500 mA, 640 mOhm DCR) and physical dimensions while offering active product status and ROHS3 compliance. The extended operating temperature range (-40°C to 125°C) provides additional thermal margin compared to the original part's -40°C to 85°C specification.

Secondary Substitute: P0770.473NL

The P0770.473NL from Pulse Electronics provides electrical equivalence with identical inductance, current rating, and DC resistance. This part offers the widest operating temperature range (-40°C to 130°C) and maintains ROHS3 compliance. Selection of this part is appropriate when Pulse Electronics supply chain availability is preferred or when the extended temperature capability is required.

Conditional Substitutes: SDR0703-470KL and ASPI-0428S-470M-T

These parts present parameter deviations that require circuit-level evaluation:

SDR0703-470KL: Reduced current rating (400 mA versus 500 mA) and increased DC resistance (720 mOhm versus 640 mOhm) necessitate verification that the application does not exceed 400 mA peak current and that the additional resistive loss is acceptable.
ASPI-0428S-470M-T: Shielded construction differs from the unshielded original design. This substitution is appropriate only when electromagnetic shielding is required or when the reduced current rating (480 mA) and improved DC resistance (587 mOhm) align with circuit requirements.

Non-Recommended: CM453232-1R5KL

This part operates at 1.5 µH inductance and is not suitable for applications requiring 47 µH. Substitution would alter circuit function and is not recommended.

Frequently Asked Questions (FAQ)

Q: Can the SDR6603-470M be used as a direct replacement for PM1608-470M?

A: Yes. The SDR6603-470M provides identical inductance (47 µH), current rating (500 mA), and DC resistance (640 mOhm) specifications. Physical dimensions and mounting type are identical. The extended operating temperature range (-40°C to 125°C) is compatible with applications designed for -40°C to 85°C operation.

Q: What is the difference between the SDR0703-470KL and the PM1608-470M?

A: The SDR0703-470KL maintains the 47 µH inductance but operates at a reduced maximum current of 400 mA (versus 500 mA) and exhibits higher DC resistance of 720 mOhm (versus 640 mOhm). This part is suitable only for applications where peak current does not exceed 400 mA and where the additional resistive loss is acceptable.

Q: Why is the ASPI-0428S-470M-T listed as a similar substitute if it is shielded?

A: The ASPI-0428S-470M-T maintains the 47 µH inductance and ±20% tolerance but introduces shielded construction, which differs from the unshielded original design. This part is appropriate for applications where electromagnetic shielding is beneficial or required, provided that the 480 mA current rating and 587 mOhm DCR are compatible with circuit requirements.

Q: Are all substitute parts RoHS compliant?

A: The PM1608-470M is RoHS non-compliant. All recommended substitute parts (SDR6603-470M, SDR0703-470KL, ASPI-0428S-470M-T, and P0770.473NL) are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Q: Can the P0770.473NL be used in place of the PM1608-470M?

A: Yes. The P0770.473NL provides electrical equivalence with identical inductance (47 µH), current rating (500 mA), and DC resistance (640 mOhm). The extended operating temperature range (-40°C to 130°C) and ROHS3 compliance make this part suitable for direct substitution.

Q: What should be considered when selecting between SDR6603-470M and P0770.473NL?

A: Both parts meet the electrical and physical requirements of the PM1608-470M. Selection should be based on supply chain availability, lead time, and manufacturer preference. The SDR6603-470M is a Bourns product, maintaining consistency with the original manufacturer. The P0770.473NL offers a wider operating temperature range and alternative sourcing.

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