SMF11AT1 Equivalent & Substitute Parts

Part Overview

The SMF11AT1 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, rated for 11V reverse standoff voltage with an 18.2V maximum clamping voltage at peak pulse current. Designed for general-purpose transient protection in surface mount applications, this component operates across -55°C to 150°C and is packaged in SOD-123FL format with 200W peak pulse power handling capability.

The SMF11AT1 is classified as obsolete. Equivalent and substitute parts from active manufacturers are available to maintain design continuity and ensure supply chain reliability for applications requiring similar transient voltage suppression characteristics.

Key Parameters

Parameter	SMF11AT1
Voltage - Reverse Standoff (Typ)	11V
Voltage - Breakdown (Min)	12.2V
Voltage - Clamping (Max) @ Ipp	18.2V
Current - Peak Pulse (10/1000µs)	11A
Power - Peak Pulse	200W
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	SOD-123F
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution of the SMF11AT1 is determined by the following electrical and mechanical parameters:

Reverse Standoff Voltage (Vwm): Substitute parts must operate within the same or adjacent voltage class to maintain circuit protection thresholds
Clamping Voltage (Vc): Maximum voltage at peak pulse current must be compatible with downstream component ratings
Peak Pulse Current (Ipp): Current handling capability at specified pulse duration (10/1000µs)
Power Dissipation: All substitute parts maintain 200W peak pulse power rating
Package Format: All substitutes use SOD-123F or equivalent surface mount packaging
Temperature Range: Operating temperature must support the application environment
Product Status: Active status ensures ongoing availability and supply chain support

The following substitute parts are grouped by voltage rating proximity to the SMF11AT1 (11V standoff):

Lower Voltage Class (12V Standoff): SMF12A Higher Voltage Classes (13V–18V Standoff): SMF13A, SMF15A, SMF16A, SMF17A, SMF18A

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ)	Vbr (Min)	Vc (Max) @ Ipp	Ipp (A)	Power (W)	Temp Range	Package	Status	RoHS
SMF11AT1	onsemi	11V	12.2V	18.2V	11A	200W	-55°C ~ 150°C	SOD-123F	Obsolete	Non-compliant
SMF12A	MDD	12V	13.3V	19.9V	10.1A	200W	-55°C ~ 150°C	SOD-123F	Active	ROHS3 Compliant
SMF13A	Diotec Semiconductor	13V	14.4V	21.5V	9.3A	200W	-50°C ~ 150°C	SOD-123F	Active	ROHS3 Compliant
SMF15A	MDD	15V	16.7V	24.4V	8.2A	200W	-55°C ~ 150°C	SOD-123F	Active	ROHS3 Compliant
SMF16A	MDD	16V	17.8V	26V	7.7A	200W	-55°C ~ 150°C	SOD-123F	Active	ROHS3 Compliant
SMF17A	Diotec Semiconductor	17V	18.9V	27.6V	7.25A	200W	-50°C ~ 150°C	SOD-123F	Active	ROHS3 Compliant
SMF18A	MDD	18V	20V	29.2V	6.8A	200W	-55°C ~ 150°C	SOD-123F	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute (Closest Match): SMF12A (MDD)

Voltage rating immediately above SMF11AT1 (12V vs. 11V standoff)
Maintains -55°C to 150°C operating range
Active product status with ROHS3 compliance
26,400 units in stock

Alternative Substitutes by Application Requirements:

For applications requiring lower clamping voltage and higher current capacity within the 11V–12V protection window, SMF12A is the optimal choice.

For applications requiring higher voltage protection thresholds, SMF13A, SMF15A, SMF16A, SMF17A, and SMF18A provide graduated voltage ratings from 13V to 18V standoff, each with corresponding adjustments to clamping voltage and peak pulse current.

All substitute parts maintain 200W peak pulse power dissipation and SOD-123F surface mount packaging, ensuring mechanical and thermal compatibility. All active substitutes carry ROHS3 compliance, addressing regulatory requirements absent in the obsolete SMF11AT1.

Frequently Asked Questions (FAQ)

Q: Can SMF12A directly replace SMF11AT1 in existing designs? A: SMF12A is electrically compatible for applications where the 12V standoff voltage (versus 11V) and 19.9V clamping voltage (versus 18.2V) remain within circuit protection specifications. Verify that downstream components tolerate the slightly higher clamping voltage. Both parts use identical SOD-123F packaging.

Q: What is the primary difference between SMF12A and higher-voltage substitutes? A: SMF12A provides the closest voltage rating match to SMF11AT1. Higher-voltage parts (SMF13A through SMF18A) are suitable only for applications requiring protection at elevated voltage thresholds. Selection depends on the protected circuit's nominal operating voltage and transient tolerance specifications.

Q: Are all substitute parts RoHS compliant? A: All active substitute parts (SMF12A, SMF13A, SMF15A, SMF16A, SMF17A, SMF18A) are ROHS3 compliant. The obsolete SMF11AT1 is RoHS non-compliant. Compliance status should be verified against procurement and regulatory requirements.

Q: Does operating temperature range affect substitution? A: SMF12A, SMF15A, SMF16A, and SMF18A support -55°C to 150°C, matching SMF11AT1. SMF13A and SMF17A support -50°C to 150°C. For applications requiring -55°C operation, select from the -55°C rated group.

Q: What packaging formats are available for substitutes? A: All substitute parts are available in SOD-123F surface mount format. SMF12A, SMF15A, SMF16A, and SMF18A are supplied in Tape & Reel (TR) packaging. Verify packaging requirements with procurement specifications.

Q: How does peak pulse current affect part selection? A: Peak pulse current decreases as voltage rating increases across the SMF series. SMF12A delivers 10.1A, while SMF18A delivers 6.8A. Select based on the maximum transient current expected in the protected circuit. All parts maintain 200W peak pulse power.

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