SMD2920P200TFA Equivalent & Substitute Parts

Part Overview

The SMD2920P200TFA is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 15V maximum voltage with a 2A hold current. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design and procurement requirements. The part operates across the -40°C to 85°C temperature range and meets ROHS3 compliance standards with cURus and TUV approvals.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMD2920P200TFA
Manufacturer	Littelfuse Inc.
Series	POLY-FUSE®, SMD2920
Product Status	Obsolete
Type	Polymeric
Voltage - Max	15V
Current - Hold (Ih) (Max)	2 A
Current - Trip (It)	4 A
Current - Max	40 A
Time to Trip	5 s
Resistance - Initial (Ri) (Min)	50 mOhms
Resistance - Post Trip (R1) (Max)	125 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	2920 (7351 Metric), Concave
Size / Dimension	0.290" L x 0.202" W (7.36mm x 5.12mm)
Thickness (Max)	0.039" (1.00mm)
RoHS Status	ROHS3 Compliant
Approval Agency	cURus, TUV

Substitute Part Grouping Explanation

Substitution of the SMD2920P200TFA is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage rating must equal or exceed 15V maximum
Current hold (Ih) rating must match or exceed 2A
Current trip (It) rating must match or exceed 4A
Operating temperature range must encompass -40°C to 85°C
Resistance characteristics (initial and post-trip) must remain within acceptable circuit tolerances

Mechanical Compatibility Criteria:

Mounting type must be Surface Mount
Package footprint and dimensions must be compatible with PCB layout
Thickness must not exceed design constraints

Compliance Criteria:

RoHS3 compliance required
Regulatory approvals (cURus, TUV, or equivalent) required

The substitute parts are grouped into two categories:

Category 1: Direct Form Factor Replacement

2920L200DR: Active equivalent with identical electrical ratings and 2920 package form factor. Differs only in packaging format (Tape & Reel) and minor thickness variation (1.25mm vs 1.00mm).

Category 2: Functional Equivalents with Different Package

SMD125F-2, SMD150F-2, SMD150F-2018-2, SMD200F-2, SMD300F/15-2: Active alternatives with matching 15V voltage rating and surface mount configuration. These parts operate within the same electrical envelope but use 2-SMD package format, requiring PCB layout modification.

Parameter Comparison

Parameter	SMD2920P200TFA	2920L200DR	SMD125F-2	SMD150F-2	SMD150F-2018-2	SMD200F-2	SMD300F/15-2
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Type	Polymeric	Polymeric	Polymeric	Polymeric	Polymeric	Polymeric	Polymeric
Voltage - Max	15V	15V	15V	15V	15V	15V	15V
Current - Hold (Ih) (Max)	2 A	2 A	1.25 A	1.5 A	1.5 A	2 A	3 A
Current - Trip (It)	4 A	4 A	2.5 A	3 A	3 A	4 A	6 A
Current - Max	40 A	40 A	40 A	40 A	40 A	40 A	40 A
Time to Trip	5 s	5 s	2 s	5 s	5 s	12 s	35 s
Resistance - Initial (Ri) (Min)	50 mOhms	50 mOhms	70 mOhms	60 mOhms	60 mOhms	50 mOhms	15 mOhms
Resistance - Post Trip (R1) (Max)	125 mOhms	125 mOhms	—	250 mOhms	—	125 mOhms	50 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2920 (7351 Metric), Concave	2920 (7351 Metric), Concave	2-SMD	2-SMD	2-SMD	2-SMD	2-SMD
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	cURus, TUV	—	CSA, TUV, UL	—	CSA, TUV, UL	CSA, TUV, UL
Moisture Sensitivity Level (MSL)	1 (Unlimited)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)	2A (4 Weeks)

Engineering Selection Recommendations

For Direct Replacement (No PCB Redesign):

The 2920L200DR is the primary substitute for SMD2920P200TFA. Both components share identical electrical specifications (15V, 2A hold current, 4A trip current, 5s trip time, 50mOhms initial resistance, 125mOhms post-trip resistance) and the same 2920 package footprint. The 2920L200DR is active and carries cURus and TUV approvals. The only differences are packaging format (Tape & Reel vs. standard packaging) and thickness (1.25mm vs. 1.00mm). Verify that the increased thickness does not conflict with PCB assembly constraints.

For Functional Equivalents (PCB Layout Modification Required):

The SMD200F-2 provides electrical equivalence with identical hold current (2A), trip current (4A), and resistance characteristics (50mOhms initial, 125mOhms post-trip). However, it uses a 2-SMD package requiring PCB footprint modification. The SMD200F-2 is active with CSA, TUV, and UL approvals, providing enhanced regulatory coverage compared to the original part.

The SMD300F/15-2 offers higher current capacity (3A hold, 6A trip) with lower initial resistance (15mOhms), suitable for applications requiring increased current margin. This part is active with CSA, TUV, and UL approvals.

The SMD125F-2, SMD150F-2, and SMD150F-2018-2 are lower current alternatives (1.25A to 1.5A hold current) appropriate only if circuit requirements permit reduced current ratings.

All substitute parts maintain ROHS3 compliance and operate across the -40°C to 85°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can 2920L200DR be used as a direct replacement for SMD2920P200TFA without PCB modification?

A: Yes. The 2920L200DR maintains identical electrical specifications and 2920 package form factor. The thickness increases from 1.00mm to 1.25mm; confirm this does not exceed PCB assembly clearance specifications.

Q: What is the primary difference between 2920L200DR and SMD200F-2?

A: The 2920L200DR uses the 2920 (7351 Metric) package, while SMD200F-2 uses a 2-SMD package. Both deliver identical electrical performance (2A hold, 4A trip, 50mOhms initial resistance). Package selection depends on PCB footprint availability and assembly constraints.

Q: Can SMD125F-2 or SMD150F-2 substitute for SMD2920P200TFA?

A: These parts have lower hold current ratings (1.25A and 1.5A respectively) compared to the original 2A specification. Substitution is only valid if circuit design permits reduced current protection thresholds.

Q: What compliance certifications should I verify for substitute parts?

A: All listed substitutes maintain ROHS3 compliance. The original part carries cURus and TUV approvals. The SMD200F-2 and SMD300F/15-2 provide enhanced regulatory coverage with CSA, TUV, and UL approvals. Verify that selected approvals meet your application's regulatory requirements.

Q: How does moisture sensitivity level (MSL) affect part selection?

A: The original SMD2920P200TFA has MSL 1 (unlimited shelf life). All substitute parts have MSL 2A (4-week shelf life after moisture exposure). Implement appropriate moisture control procedures during storage and assembly if MSL 2A parts are selected.

Q: Are there any differences in trip time between substitute options?

A: Yes. The SMD2920P200TFA and 2920L200DR both specify 5-second trip time. The SMD200F-2 specifies 12 seconds, and SMD300F/15-2 specifies 35 seconds. Longer trip times may affect circuit protection response; verify compatibility with application requirements.

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