Bourns 9250-271 Equivalent & Substitute Parts

Part Overview

The Bourns 9250-271 is a 270 nH shielded drum core wirewound inductor rated for 855 mA with a maximum DC resistance of 110 mOhm. This axial through-hole component operates across the temperature range of -55°C to 105°C and is designed for applications requiring low inductance values with controlled impedance characteristics at high frequencies.

The 9250-271 carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and field replacement applications.

Key Parameters

Parameter	Value
Inductance	270 nH
Inductance Tolerance	±10%
Current Rating	855 mA
DC Resistance (Max)	110 mOhm
Shielding	Shielded
Q Factor @ 25 MHz	47
Self Resonant Frequency	250 MHz
Operating Temperature Range	-55°C to 105°C
Mounting Type	Through Hole
Package / Case	Axial
Physical Dimensions	0.162" Dia × 0.410" L (4.11 mm × 10.41 mm)

Substitute Part Grouping Explanation

Substitute parts for the Bourns 9250-271 are qualified based on the following electrical and mechanical parameters:

Inductance Value: 270 nH ±10% tolerance
Current Rating: Minimum 853 mA (within 99.8% of original specification)
DC Resistance: 110 mOhm maximum
Shielding: Shielded construction required
Frequency Characteristics: Q factor of 47 @ 25 MHz and self-resonant frequency of 250 MHz
Operating Temperature: -55°C to 105°C range
Mounting and Package: Through-hole axial configuration with identical physical dimensions (0.162" Dia × 0.410" L)

The API Delevan ER1641 series inductors meet these substitution criteria. While the ER1641 variants employ molded construction with phenolic cores (compared to the drum core ferrite design of the 9250-271), the electrical performance parameters remain equivalent within the specified tolerances.

Parameter Comparison

Parameter	Bourns 9250-271	API Delevan ER1641-271KM	API Delevan ER1641-271KP	API Delevan ER1641-271KR	API Delevan ER1641-271KS
Inductance	270 nH	270 nH	270 nH	270 nH	270 nH
Inductance Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (mA)	855	853	853	853	853
DC Resistance (Max)	110 mOhm	110 mOhm	110 mOhm	110 mOhm	110 mOhm
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Q @ 25 MHz	47	47	47	47	47
Self Resonant Frequency	250 MHz	250 MHz	250 MHz	250 MHz	250 MHz
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial	Axial	Axial
Physical Dimensions	0.162" Dia × 0.410" L	0.162" Dia × 0.410" L	0.162" Dia × 0.410" L	0.162" Dia × 0.410" L	0.162" Dia × 0.410" L
Product Status	Obsolete	Active	Active	Active	Active
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

The API Delevan ER1641 series (ER1641-271KM, ER1641-271KP, ER1641-271KR, ER1641-271KS) provides direct functional equivalence to the obsolete Bourns 9250-271. All four variants maintain identical electrical specifications and physical form factors, ensuring drop-in compatibility in through-hole PCB applications.

Selection among the four ER1641 variants is determined by packaging and supply chain requirements:

ER1641-271KM: 818 units in stock
ER1641-271KP: 885 units in stock
ER1641-271KR: 929 units in stock
ER1641-271KS: 1,013 units in stock

All substitute parts carry active product status, ensuring long-term availability and continued manufacturer support. Both the original Bourns 9250-271 and all API Delevan ER1641 variants are RoHS non-compliant and REACH unaffected, with identical ECCN (EAR99) and HTSUS (8504.50.8000) classifications.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan ER1641 series be used as a direct replacement for the Bourns 9250-271?

A: Yes. The ER1641-271KM, ER1641-271KP, ER1641-271KR, and ER1641-271KS inductors meet all electrical and mechanical specifications of the 9250-271, including inductance value, current rating, DC resistance, frequency characteristics, temperature range, and physical dimensions. PCB layout and component placement require no modification.

Q: What is the difference between the four ER1641 variants?

A: The ER1641-271KM, ER1641-271KP, ER1641-271KR, and ER1641-271KS are electrically and mechanically identical. Differences exist only in packaging configuration and inventory availability. All are supplied in Tape & Reel (TR) format for automated assembly.

Q: Does the change from drum core ferrite to molded phenolic core affect circuit performance?

A: No. Both construction types deliver the specified electrical parameters: 270 nH inductance, 47 Q factor at 25 MHz, 250 MHz self-resonant frequency, and 110 mOhm maximum DC resistance. The molded phenolic design of the ER1641 series maintains shielding effectiveness and frequency response characteristics equivalent to the original ferrite drum core design.

Q: Are there any compliance or certification differences between the original and substitute parts?

A: No. Both the Bourns 9250-271 and all API Delevan ER1641 variants share identical RoHS status (non-compliant), REACH status (unaffected), ECCN classification (EAR99), and HTSUS code (8504.50.8000).

Q: What is the current rating difference between the 9250-271 (855 mA) and ER1641 variants (853 mA)?

A: The 2 mA difference represents a 0.2% variance and falls within normal manufacturing tolerance. Both ratings are functionally equivalent for circuit design purposes. Applications operating at or below 853 mA experience no performance degradation.

Q: Can the ER1641 series be used in existing bulk packaging workflows?

A: The ER1641 series is supplied exclusively in Tape & Reel (TR) format. If bulk packaging is required for manual assembly or specific handling procedures, component reeling or custom packaging services may be necessary.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message