Littelfuse 021301.6TXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 021301.6TXP is a 1.6 A, 250 V AC/DC slow-blow glass cartridge fuse in 5mm × 20mm form factor. This component is active in production and widely used in industrial and consumer electronics for circuit protection. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and regulatory compliance. Alternative models may be required due to inventory availability, regional certification requirements, or specific application performance characteristics.

Key Parameters

Parameter	Value
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm × 20mm
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Primary Matching Criteria (Non-Negotiable):

Current Rating: 1.6 A
Voltage Rating: 250 V AC
Fuse Type: Cartridge, Glass
Response Time: Slow Blow
Package / Case: 5mm × 20mm
Mounting Type: Requires Holder
Operating Temperature Range: -55°C to 125°C

Secondary Considerations:

Breaking Capacity @ Rated Voltage (varies by series)
Melting I²t (thermal energy characteristic)
DC Cold Resistance (varies by series design)
Regulatory Approval Agencies (application-dependent)
Product Status (Active)

All substitute parts listed maintain identical electrical and mechanical specifications for the primary criteria. Variations in breaking capacity, melting I²t, and DC cold resistance reflect different series designs but do not affect basic substitutability for standard circuit protection applications.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Inventory (Pcs)
021301.6TXP	Littelfuse	213	1.6	250	35	44.2	0.0551	904
021301.6MXP	Littelfuse	213	1.6	250	35	44.2	0.0551	1001
021801.6HXP	Littelfuse	218	1.6	250	35	23.35	0.0336	1213
021801.6MXP	Littelfuse	218	1.6	250	35	23.35	0.0336	2622
021801.6TXP	Littelfuse	218	1.6	250	35	23.35	0.0336	704
021901.6MXABP	Littelfuse	219XA	1.6	250	150	44.2	0.0551	2757
021901.6MXAP	Littelfuse	219XA	1.6	250	150	44.2	0.0551	2200
023901.6HXP	Littelfuse	239	1.6	250	100	30.43	0.1205	2100
023901.6MXP	Littelfuse	239	1.6	250	100	30.43	0.1205	5626
061801.6MXP	Littelfuse	618	1.6	250	35	23.35	0.0336	10400
0034.3119	SCHURTER	FST 5x20	1.6	250	35	10.5	—	8955

Engineering Selection Recommendations

Series 213 (021301.6TXP, 021301.6MXP): Both parts are functionally identical with matching electrical and thermal characteristics. Selection between them is based on inventory availability and packaging preference. Approvals include BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE.

Series 218 (021801.6HXP, 021801.6MXP, 021801.6TXP): These parts feature lower melting I²t (23.35 vs. 44.2) and reduced DC cold resistance (0.0336 Ω vs. 0.0551 Ω) compared to Series 213. Suitable for applications requiring faster thermal response. Regulatory approvals vary slightly; 021801.6TXP includes BSI and KC certifications.

Series 219XA (021901.6MXABP, 021901.6MXAP): Enhanced breaking capacity (150 A) with matching thermal characteristics to Series 213. Appropriate for high-fault-current environments. Both variants carry identical electrical ratings and certifications (CCC, CE, CSA, PSE, SEMKO, UL, VDE).

Series 239 (023901.6HXP, 023901.6MXP): Intermediate breaking capacity (100 A) with melting I²t of 30.43. Higher DC cold resistance (0.1205 Ω) indicates different internal design. Limited certification scope (CE, CSA, KC, PSE, UL). Suitable for specific regional or application requirements.

Series 618 (061801.6MXP): Littelfuse alternative with Series 218 thermal characteristics and 35 A breaking capacity. Highest inventory availability (10,400 pcs). Certifications: CCC, CE, CSA, UR, VDE.

SCHURTER 0034.3119: Cross-manufacturer equivalent with identical electrical ratings and 5mm × 20mm form factor. Lowest melting I²t (10.5) indicates fastest thermal response. Certifications: CCC, cURus, PSE/JET, VDE. Suitable for applications requiring rapid fuse operation.

Frequently Asked Questions (FAQ)

Q: Can I substitute 021301.6TXP with any of the listed parts? A: Yes, all listed parts maintain the same current rating (1.6 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), and package dimensions (5mm × 20mm). Physical and electrical interchangeability is confirmed. Verify regulatory certifications match your application requirements.

Q: What is the difference between Series 213 and Series 218? A: Series 218 has lower melting I²t (23.35 vs. 44.2) and reduced DC cold resistance (0.0336 Ω vs. 0.0551 Ω), resulting in faster thermal response. Both maintain identical current and voltage ratings. Selection depends on application thermal requirements.

Q: When should I use Series 219XA instead of Series 213? A: Series 219XA provides higher breaking capacity (150 A vs. 35 A), making it suitable for circuits with higher fault currents. Thermal and electrical characteristics remain identical. Use Series 219XA in high-fault-current environments or when specified by design requirements.

Q: Is the SCHURTER 0034.3119 a direct replacement? A: Yes, the SCHURTER part is electrically and mechanically equivalent with identical current, voltage, and package specifications. It features the lowest melting I²t (10.5), providing the fastest thermal response. Verify that SCHURTER certifications (CCC, cURus, PSE/JET, VDE) satisfy your application and regional requirements.

Q: What does breaking capacity mean, and why does it vary? A: Breaking capacity is the maximum fault current the fuse can safely interrupt without rupturing. Series 213 and 218 are rated 35 A, Series 239 is 100 A, and Series 219XA is 150 A. Higher breaking capacity is required in circuits with greater fault current potential. Standard applications typically require 35 A breaking capacity.

Q: Can I use a part with higher breaking capacity as a substitute? A: Yes. A fuse with higher breaking capacity provides equal or greater safety margin. For example, Series 219XA (150 A) can replace Series 213 (35 A) in any application. The reverse substitution is not recommended, as lower breaking capacity may be insufficient for high-fault-current circuits.

Q: Do all substitute parts have the same regulatory approvals? A: No. Approval agencies vary by series. The main part (021301.6TXP) includes BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE. Verify that your selected substitute carries certifications required by your regional standards and application specifications.

Q: What is DC cold resistance, and why does it differ? A: DC cold resistance is the measured resistance of the fuse element at room temperature. Variations reflect different internal designs and materials. Lower resistance (0.0336 Ω) reduces voltage drop; higher resistance (0.1205 Ω) increases it. For most applications, this difference is negligible unless the circuit is extremely sensitive to voltage drop.

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