SMF36AT1G Equivalent & Substitute Parts

Part Overview

The SMF36AT1G is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 36V reverse standoff voltage with a 58.1V maximum clamping voltage and 3.4A peak pulse current capability in a SOD-123FL package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	SMF36AT1G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	36V
Voltage - Breakdown (Min)	40V
Voltage - Clamping (Max) @ Ipp	58.1V
Current - Peak Pulse (10/1000µs)	3.4A
Power - Peak Pulse	200W
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	SOD-123F
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SMF36AT1G is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 36V nominal
Maximum clamping voltage: 58.1V
Peak pulse current: 3.4A minimum
Power dissipation: 200W peak pulse
Package type: SOD-123F surface mount
Unidirectional configuration: Single channel
Operating temperature range: -55°C to 150°C minimum

Substitution Categories:

Direct Equivalents maintain identical electrical specifications and package configuration, enabling pin-for-pin replacement without circuit modification.

Functional Alternatives operate within the same voltage and current parameters but may originate from different manufacturers or packaging formats (Tape & Reel vs. Cut Tape). These components satisfy the same protection requirements while offering improved supply availability.

Related Voltage Series provide TVS protection across the SMF series voltage range. These parts share identical package, power rating, and temperature specifications but operate at different voltage levels. Selection depends on the specific circuit protection voltage requirement.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
SMF36AT1G	Littelfuse Inc.	36V	58.1V	3.4A	200W	SOD-123F	Obsolete	ROHS3 Compliant
SMF36A	MDD	36V	58.1V	3.44A	200W	SOD-123FL	Active	ROHS3 Compliant
SMF36A-T13	Littelfuse Inc.	36V	58.1V	3.4A	200W	SOD-123F	Active	ROHS3 Compliant
SMF20A	MDD	20V	32.4V	6.2A	200W	SOD-123F	Active	ROHS3 Compliant
SMF22A	MDD	22V	35.5V	5.6A	200W	SOD-123F	Active	ROHS3 Compliant
SMF24A	MDD	24V	38.9V	5.1A	200W	SOD-123F	Active	ROHS3 Compliant
SMF26A	EVVO Semi	26V	42.1V	4.8A	200W	SOD-123F	Active	ROHS3 Compliant
SMF28A	MDD	28V	45.4V	4.4A	200W	SOD-123F	Active	ROHS3 Compliant
SMF30A	MDD	30V	48.4V	4.1A	200W	SOD-123F	Active	ROHS3 Compliant
SMF33A	Diotec Semiconductor	33V	53.3V	3.75A	200W	SOD-123F	Active	ROHS3 Compliant
SMF43A	Diotec Semiconductor	43V	69.4V	2.88A	200W	SOD-123F	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (36V Protection Requirement):

SMF36A-T13 (Littelfuse Inc.) is the primary direct equivalent, maintaining identical electrical specifications and originating from the original manufacturer. This component is currently active and ROHS3 compliant, providing seamless substitution for the obsolete SMF36AT1G.

SMF36A (MDD) provides equivalent electrical performance with a marginally higher peak pulse current specification (3.44A vs. 3.4A). Both components operate at 36V reverse standoff with 58.1V clamping voltage and 200W peak pulse power. This part is active and ROHS3 compliant.

Alternative Voltage Series Selection:

For applications requiring different voltage protection levels within the SMF series, the following active components maintain identical package, power rating, and temperature specifications:

SMF33A (Diotec Semiconductor) operates at 33V reverse standoff with 53.3V clamping voltage and 3.75A peak pulse current, suitable for circuits requiring lower voltage protection thresholds.

SMF43A (Diotec Semiconductor) operates at 43V reverse standoff with 69.4V clamping voltage and 2.88A peak pulse current, appropriate for higher voltage protection applications.

All recommended substitutes are ROHS3 compliant and rated for -55°C to 150°C operating temperature, matching the original component's environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can SMF36A replace SMF36AT1G directly?

A: Yes. SMF36A maintains the same 36V reverse standoff voltage, 58.1V clamping voltage, and 200W peak pulse power rating. The peak pulse current specification is marginally higher (3.44A vs. 3.4A), which does not affect compatibility. Both components use SOD-123F packaging and are ROHS3 compliant.

Q: What is the difference between SMF36A-T13 and SMF36A?

A: Both components are electrically equivalent with identical voltage and current specifications. The primary difference is packaging format: SMF36A-T13 is supplied in Tape & Reel format, while SMF36A availability may vary by supplier. Both originate from active product lines and are suitable replacements for the obsolete SMF36AT1G.

Q: Can I use SMF33A or SMF43A as substitutes?

A: SMF33A and SMF43A are not direct replacements. These components operate at different voltage levels (33V and 43V respectively) and are intended for circuits requiring protection at those specific voltage thresholds. Use these alternatives only if your circuit design permits operation at the alternative voltage specification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute components listed are ROHS3 compliant, matching the environmental compliance status of the original SMF36AT1G.

Q: What is the operating temperature range for substitute parts?

A: All substitute components operate across -55°C to 150°C (TJ), matching the original component's thermal specifications. This ensures compatibility in applications with identical environmental requirements.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) and Cut Tape (CT) packaging formats are supply chain variations only. The electrical specifications and performance characteristics remain identical regardless of packaging format.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message