Bourns 4608X-102-124 120kΩ Resistor Array 8-SIP Equivalent & Substitute Parts

Part Overview

The Bourns 4608X-102-124 is a 4-resistor isolated network array with 120kΩ resistance per element, rated at 300mW power dissipation per element, and ±2% tolerance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 8-SIP through-hole package provides standard PCB integration for legacy and new applications requiring isolated resistor networks with stable temperature characteristics.

Key Parameters

Parameter	Value
Resistance Value	120kΩ
Tolerance	±2%
Number of Resistors	4
Circuit Type	Isolated
Power Per Element	300mW
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C to 125°C
Number of Pins	8
Package Type	8-SIP Through Hole
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the 4608X-102-124 is determined by strict equivalence across the following critical parameters: resistance value (120kΩ), tolerance (±2%), number of resistors (4), circuit configuration (isolated), power rating per element (300mW), temperature coefficient (±100ppm/°C), operating temperature range (-55°C to 125°C), pin count (8), and package type (8-SIP through hole).

The substitute parts are grouped into two categories:

Direct Equivalent (Same Series): The 4608X-102-124LF maintains identical electrical specifications and physical dimensions while offering improved compliance status (RoHS3 compliant vs. non-compliant original).

Functional Equivalent (Alternative Series): The 4308R-102-124 and 4308R-102-124LF belong to the 4300R series and meet all core electrical requirements. Physical dimensions differ slightly (0.784" L × 0.085" W vs. 0.798" L × 0.098" W), and the resistor-ratio-drift specification is tighter at 50ppm/°C compared to the original's unspecified drift. REACH status differs between series.

Parameter Comparison

Parameter	4608X-102-124 (Original)	4608X-102-124LF (Direct)	4308R-102-124	4308R-102-124LF
Resistance (Ohms)	120k	120k	120k	120k
Tolerance	±2%	±2%	±2%	±2%
Number of Resistors	4	4	4	4
Circuit Type	Isolated	Isolated	Isolated	Isolated
Power Per Element (mW)	300	300	300	300
Temperature Coefficient	±100ppm/°C	±100ppm/°C	±100ppm/°C	±100ppm/°C
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Number of Pins	8	8	8	8
Package / Case	8-SIP	8-SIP	8-SIP	8-SIP
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Length × Width (mm)	20.27 × 2.49	20.27 × 2.49	19.91 × 2.16	19.91 × 2.16
Height - Seated Max (mm)	5.08	5.08	4.95	4.95
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	Non-compliant	ROHS3 Compliant
REACH Status	Unaffected	Unaffected	Affected	Affected
Resistor-Ratio-Drift	Not specified	Not specified	50ppm/°C	50ppm/°C

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: Select 4608X-102-124LF or 4308R-102-124LF. Both parts meet ROHS3 compliance standards. The 4608X-102-124LF maintains identical physical dimensions to the original obsolete part, minimizing PCB layout modifications.

For REACH Unaffected Status: Select 4608X-102-124 (original, if available) or 4608X-102-124LF. The 4300R series (4308R-102-124 and 4308R-102-124LF) carries REACH Affected status.

For Dimensional Compatibility: The 4608X series (4608X-102-124LF) preserves the original footprint (20.27mm L × 2.49mm W × 5.08mm H). The 4308R series introduces minor dimensional changes (19.91mm L × 2.16mm W × 4.95mm H), which may require PCB layout verification for tight spacing applications.

For Active Product Status: All substitute parts (4608X-102-124LF, 4308R-102-124, 4308R-102-124LF) are active products with confirmed inventory availability, eliminating obsolescence risk.

Frequently Asked Questions (FAQ)

Q: Can the 4608X-102-124LF directly replace the obsolete 4608X-102-124?

A: Yes. The 4608X-102-124LF is electrically and mechanically identical to the original part, with identical resistance value, tolerance, power rating, temperature coefficient, and physical dimensions. The primary difference is active product status and RoHS3 compliance. No circuit modifications or PCB layout changes are required.

Q: What are the key differences between the 4608X and 4308R series?

A: Both series meet all core electrical specifications (120kΩ, ±2%, 300mW, ±100ppm/°C, -55°C to 125°C). The 4308R series specifies resistor-ratio-drift at 50ppm/°C, whereas the 4608X series does not specify this parameter. Physical dimensions differ slightly: 4608X measures 20.27mm × 2.49mm × 5.08mm (seated height), while 4308R measures 19.91mm × 2.16mm × 4.95mm. REACH status also differs: 4608X is REACH Unaffected, while 4308R is REACH Affected.

Q: Are the 4308R parts suitable for applications requiring REACH Unaffected status?

A: No. The 4308R-102-124 and 4308R-102-124LF carry REACH Affected status. For REACH Unaffected requirements, use the 4608X-102-124LF.

Q: Do the dimensional differences between 4608X and 4308R series affect PCB compatibility?

A: The 4308R series is slightly smaller in length (19.91mm vs. 20.27mm), width (2.16mm vs. 2.49mm), and seated height (4.95mm vs. 5.08mm). For applications with tight component spacing or specific clearance requirements, verify PCB layout compatibility before substitution. Pin configuration and spacing remain identical across both series.

Q: Which substitute part offers the best compliance profile?

A: The 4608X-102-124LF combines RoHS3 compliance with REACH Unaffected status and maintains identical dimensions to the original part, making it the optimal choice for compliance-driven applications without design modifications.

Q: Is inventory availability a consideration for part selection?

A: Yes. Current inventory shows 1732 units of 4608X-102-124LF (bulk packaging), 895 units of 4308R-102-124 (tube packaging), and 808 units of 4308R-102-124LF (tube packaging). The 4608X-102-124LF offers the highest stock level for immediate procurement.

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