PTC Thermistor PRF18BC471QB1RB Equivalent & Substitute Parts

Part Overview

The Murata Electronics PRF18BC471QB1RB is a PTC thermistor with 470 Ohms resistance at 25°C, housed in a 0603 (1608 Metric) surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across a temperature range of -20°C to 130°C with ±50% resistance tolerance and unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value
Resistance @ 25°C	470 Ohms
Resistance Tolerance	±50%
Operating Temperature Range	-20°C ~ 130°C
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the PRF18BC471QB1RB is determined by strict alignment of electrical and mechanical parameters:

Primary Substitution Criteria:

Resistance value: 470 Ohms at 25°C
Resistance tolerance: ±50%
Package: 0603 (1608 Metric) surface mount
Moisture sensitivity: MSL 1 (Unlimited)

Acceptable Operating Temperature Ranges: Substitute parts must maintain the specified resistance and tolerance within their operating temperature range. The original part operates -20°C to 130°C. Substitute parts with extended ranges (-40°C to 125°C) remain compatible as they cover the original operating window.

Active Status Requirement: All listed substitutes are active products from Murata Electronics (POSISTOR® PRF18/21 series) or EPCOS - TDK Electronics (B59601 and B59641 series), ensuring long-term availability and supply chain stability.

Parameter Comparison

Part Number	Manufacturer	Series	Resistance @ 25°C	Tolerance	Operating Temp	Package	Status	RoHS
PRF18BC471QB1RB	Murata Electronics	POSISTOR® PRF18/21	470 Ohms	±50%	-20°C ~ 130°C	0603 (1608 Metric)	Obsolete	N/A
PRF18AS471QB5RB	Murata Electronics	POSISTOR® PRF18/21	470 Ohms	±50%	-20°C ~ 120°C	0603 (1608 Metric)	Active	ROHS3 Compliant
PRF18BC471QB5RB	Murata Electronics	POSISTOR® PRF18/21	470 Ohms	±50%	-20°C ~ 130°C	0603 (1608 Metric)	Active	ROHS3 Compliant
B59601A0075A062	EPCOS - TDK Electronics	B59601	470 Ohms	±50%	-40°C ~ 125°C	0603 (1608 Metric)	Active	ROHS3 Compliant
B59601A0085A062	EPCOS - TDK Electronics	B59601	470 Ohms	±50%	-40°C ~ 125°C	0603 (1608 Metric)	Active	ROHS3 Compliant
B59601A0095A062	EPCOS - TDK Electronics	B59601	470 Ohms	±50%	-40°C ~ 125°C	0603 (1608 Metric)	Active	ROHS3 Compliant
B59601A0105A062	EPCOS - TDK Electronics	B59601	470 Ohms	±50%	-40°C ~ 125°C	0603 (1608 Metric)	Active	ROHS3 Compliant
B59601A0115A062	EPCOS - TDK Electronics	B59601	470 Ohms	±50%	-40°C ~ 125°C	0603 (1608 Metric)	Active	ROHS3 Compliant
B59601A0125A062	EPCOS - TDK Electronics	B59601	470 Ohms	±50%	-40°C ~ 125°C	0603 (1608 Metric)	Active	ROHS3 Compliant
B59601A0135A062	EPCOS - TDK Electronics	B59601	470 Ohms	±50%	-40°C ~ 125°C	0603 (1608 Metric)	Active	ROHS3 Compliant
B59641A0085A062	EPCOS - TDK Electronics	B59641	470 Ohms	±50%	-40°C ~ 125°C	0603 (1608 Metric)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Murata Replacement: PRF18BC471QB5RB is the active equivalent from Murata Electronics within the same POSISTOR® PRF18/21 series. It maintains identical electrical specifications and operating temperature range (-20°C to 130°C) as the obsolete PRF18BC471QB1RB, with the addition of ROHS3 compliance. This part is available in Cut Tape and Digi-Reel packaging with 24,480 units in stock.

Alternative from Same Manufacturer: PRF18AS471QB5RB offers active status and ROHS3 compliance from Murata Electronics. The operating temperature range is -20°C to 120°C, which covers the original part's minimum operating window. This part is supplied in Tape & Reel packaging with 6,900 units in stock.

EPCOS - TDK Electronics B59601 Series: The B59601 series (B59601A0075A062, B59601A0085A062, B59601A0095A062, B59601A0105A062, B59601A0115A062, B59601A0125A062, B59601A0135A062) provides extended operating temperature range (-40°C to 125°C) with ROHS3 compliance. All variants maintain 470 Ohms resistance and ±50% tolerance. These parts are actively produced and available in quantities ranging from 3,907 to 21,140 units.

Automotive-Grade Option: B59641A0085A062 is qualified to AEC-Q200 automotive standards and designated as automotive grade. It maintains the same electrical specifications with extended temperature range (-40°C to 125°C) and ROHS3 compliance. This part is suitable for applications requiring automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can PRF18AS471QB5RB replace PRF18BC471QB1RB in all applications? A: PRF18AS471QB5RB is compatible for applications operating within -20°C to 120°C. If your design requires operation above 120°C up to 130°C, use PRF18BC471QB5RB instead, which maintains the full -20°C to 130°C range.

Q: What is the difference between Murata and EPCOS - TDK Electronics substitutes? A: Both manufacturers provide 470 Ohms PTC thermistors in 0603 packages with ±50% tolerance. EPCOS - TDK Electronics B59601 and B59641 series offer extended operating temperature (-40°C to 125°C) compared to the original -20°C to 130°C range. The B59641 series includes automotive-grade qualification (AEC-Q200).

Q: Are all substitute parts ROHS3 compliant? A: All active substitute parts listed are ROHS3 compliant. The original PRF18BC471QB1RB (obsolete) does not specify RoHS status.

Q: Does packaging affect substitution compatibility? A: All substitute parts use identical 0603 (1608 Metric) surface mount packaging. Packaging format (Tape & Reel, Cut Tape, or Digi-Reel) affects supply and handling but not electrical or mechanical compatibility.

Q: Can B59641A0085A062 be used in non-automotive applications? A: Yes. B59641A0085A062 is automotive-qualified but functionally equivalent to standard B59601 series parts. It can be used in any application requiring 470 Ohms PTC thermistor in 0603 package.

Q: What is the significance of the alphanumeric suffix in part numbers (e.g., QB1RB vs QB5RB)? A: The suffix indicates manufacturing date code and packaging configuration. Electrical and mechanical specifications remain identical across these variants.

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