NB12MC0221JBA Equivalent & Substitute Parts

Part Overview

The NB12MC0221JBA is an NTC thermistor manufactured by KYOCERA AVX with a nominal resistance of 220 ohms at 25°C and a B-value of 3910K. This surface-mount component in 0805 (2012 Metric) package is designed for temperature sensing applications across the -55°C to 150°C operating range. The part is currently active in production status and fully compliant with ROHS3 and REACH regulations.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits selection from multiple qualified manufacturers. Murata Electronics offers several NTC thermistor alternatives that share compatible package specifications and thermal characteristics suitable for direct substitution in many applications.

Substiute Parts

NB12MC0221JBA

KYOCERA AVXIn Stock: 854NB12MC0221JBA Datasheet

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NCP21WB333J03RA

Murata ElectronicsIn Stock: 97284NCP21WB333J03RA Datasheet

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NCP21WB473J03RA

Murata ElectronicsIn Stock: 92646NCP21WB473J03RA Datasheet

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NCP21WF104J03RA

Murata ElectronicsIn Stock: 27605NCP21WF104J03RA Datasheet

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NCP21XM221J03RA

Murata ElectronicsIn Stock: 2500NCP21XM221J03RA Datasheet

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NCP21XM472J03RA

Murata ElectronicsIn Stock: 1666NCP21XM472J03RA Datasheet

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NCP21XQ102J03RA

Murata ElectronicsIn Stock: 8348NCP21XQ102J03RA Datasheet

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NCP21XQ471J03RA

Murata ElectronicsIn Stock: 3514NCP21XQ471J03RA Datasheet

MFR RecommendedRFQ

NCP21XW153J03RA

Murata ElectronicsIn Stock: 4294NCP21XW153J03RA Datasheet

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NCP21XW222J03RA

Murata ElectronicsIn Stock: 4163NCP21XW222J03RA Datasheet

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NCP21XW223J03RA

Murata ElectronicsIn Stock: 6898NCP21XW223J03RA Datasheet

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NTHS0805N17N1003JE

Vishay DaleIn Stock: 7104NTHS0805N17N1003JE Datasheet

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NTHS0805N17N1503JE

Vishay DaleIn Stock: 2226NTHS0805N17N1503JE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for NTC thermistors is determined by the following criteria applied strictly to the provided parameters:

Primary Compatibility Criteria:

• Package / Case: 0805 (2012 Metric) — all substitute parts must match this form factor
• Mounting Type: Surface Mount — all substitutes must be surface-mount compatible
• Resistance Tolerance: ±5% — all substitutes must maintain this tolerance specification
• B Value Tolerance: ±3% — all substitutes must maintain this tolerance specification
• RoHS Status: ROHS3 Compliant — all substitutes must meet this regulatory requirement
• Moisture Sensitivity Level: 1 (Unlimited) — all substitutes must match this MSL rating

Secondary Compatibility Considerations:

• Resistance value at 25°C and B-value characteristics determine thermal response curves
• Operating temperature range and power dissipation ratings define application suitability
• Product status (Active vs. Not For New Designs) indicates long-term availability

All substitute parts listed below meet the primary compatibility criteria. Differences in resistance values, B-values, and operating temperature ranges reflect design variations that may be acceptable depending on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Active Production Status Consideration: The NB12MC0221JBA maintains active production status with KYOCERA AVX. All listed Murata Electronics substitutes carry "Not For New Designs" status, indicating these parts are in mature or declining production phases. For new designs requiring long-term component availability, the primary part NB12MC0221JBA is the preferred selection.

Compliance and Certification: All listed parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard PCB assembly processes and storage requirements. All parts carry EAR99 ECCN classification and identical HTSUS codes (8533.40.8070), confirming regulatory equivalence.

Thermal Characteristic Variations: Murata substitutes exhibit B-value variations ranging from 3545K to 4311K compared to the primary part's 3910K specification. These differences result in measurable variations in temperature response curves. Selection of a substitute with differing B-value characteristics requires circuit-level thermal response validation.

Operating Temperature Range: The primary part supports -55°C to 150°C operation, while all Murata substitutes are limited to -40°C to 125°C. Applications requiring operation below -40°C or above 125°C cannot use listed substitutes.

Power Dissipation: Murata substitutes provide 200 mW maximum power dissipation compared to 120 mW for the primary part. This higher rating does not create compatibility issues in applications designed for the primary part's 120 mW specification.

Frequently Asked Questions (FAQ)

Q: Can NCP21XM221J03RA directly replace NB12MC0221JBA in all applications?

A: Both parts share identical 220 Ω resistance at 25°C and 0805 package specifications. However, the B-value differs (3545K vs. 3910K), resulting in different temperature response characteristics. Direct substitution is valid only if the application's thermal sensing algorithm can accommodate this B-value variation or if the circuit design does not depend on precise B-value matching.

Q: Why do the Murata parts show "Not For New Designs" status?

A: This designation indicates the parts are in mature production phases with potential future discontinuation. For applications requiring guaranteed long-term availability, the active-status NB12MC0221JBA is the appropriate choice. Murata substitutes are suitable for legacy design support or short-term production runs where existing inventory is available.

Q: Are all listed substitutes compatible with the same PCB footprint?

A: Yes. All parts use the 0805 (2012 Metric) surface-mount package with identical mechanical dimensions and land pattern requirements. No PCB layout modifications are necessary for physical substitution.

Q: What is the significance of the B-value differences between parts?

A: The B-value determines the thermistor's temperature coefficient and thermal response curve. A higher B-value (e.g., 4311K in NCP21WF104J03RA) produces steeper temperature response compared to lower B-values (e.g., 3545K in NCP21XM221J03RA). Applications using thermistor resistance values for temperature calculation must account for these differences through calibration or algorithm adjustment.

Q: Can I use a substitute with different resistance value, such as NCP21XQ471J03RA (470 Ω) instead of the 220 Ω primary part?

A: Different resistance values produce different voltage divider ratios and thermal response characteristics in sensing circuits. Substitution with different resistance values requires circuit redesign and recalibration. Such substitutions are not direct equivalents and demand full thermal performance validation.

Q: What is the impact of the -40°C lower temperature limit on Murata substitutes?

A: Applications requiring operation below -40°C cannot use Murata substitutes. The primary NB12MC0221JBA supports -55°C minimum operation. If your application requires sub -40°C performance, the primary part is mandatory.

Q: Are there any moisture sensitivity or storage differences between the primary part and substitutes?

A: No. Both the primary part and all substitutes carry MSL 1 (Unlimited) ratings, indicating unlimited shelf life under standard storage conditions. Moisture sensitivity handling and storage requirements are identical across all parts.