SDM1A40LP8-7 Equivalent & Substitute Parts

Part Overview

The SDM1A40LP8-7 is a Schottky diode rated for 40 V DC reverse voltage and 1 A average rectified current, packaged in a 2-UFDFN surface mount configuration. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design requirements and procurement needs. The part is RoHS3 compliant and REACH unaffected, suitable for applications requiring fast recovery rectification in compact form factors.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	590 mV @ 1 A
Technology	Schottky
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	14 ns
Current - Reverse Leakage @ Vr	20 µA @ 40 V
Package / Case	2-UFDFN
Supplier Device Package	U-DFN1608-2
Operating Temperature - Junction	-65°C ~ 150°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SDM1A40LP8-7 is determined by equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 1 A
Technology: Schottky
Package / Case: 2-UFDFN
Supplier Device Package: U-DFN1608-2

Mechanical Equivalence Criteria:

Mounting Type: Surface Mount
Operating Temperature - Junction: -65°C ~ 150°C

The SDM1M40LP8-7 satisfies all substitution criteria as an active product from the same manufacturer (Diodes Incorporated) with identical voltage, current, package, and thermal specifications. Variations in forward voltage, reverse recovery time, and capacitance are within the tolerance range for this component category and do not preclude functional substitution.

Parameter Comparison

Parameter	SDM1A40LP8-7 (Main Part)	SDM1M40LP8-7 (Substitute)
Manufacturer	Diodes Incorporated	Diodes Incorporated
Category	Diodes, Rectifiers	Diodes, Rectifiers
Technology	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V
Current - Average Rectified (Io)	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	590 mV @ 1 A	660 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	14 ns	8.4 ns
Current - Reverse Leakage @ Vr	20 µA @ 40 V	20 µA @ 40 V
Package / Case	2-UFDFN	2-UFDFN
Supplier Device Package	U-DFN1608-2	U-DFN1608-2
Mounting Type	Surface Mount	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The SDM1M40LP8-7 is the direct substitute for the obsolete SDM1A40LP8-7. Both parts are manufactured by Diodes Incorporated and maintain identical electrical ratings (40 V, 1 A) and package specifications (2-UFDFN, U-DFN1608-2).

The SDM1M40LP8-7 is classified as an active product with full manufacturing support and availability (55,200 pcs in stock), whereas the SDM1A40LP8-7 is obsolete. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and production.

The SDM1M40LP8-7 exhibits improved reverse recovery time (8.4 ns versus 14 ns) and reduced capacitance (25 pF @ 5V versus 69 pF @ 1V), representing performance enhancements in the active variant. Forward voltage is slightly elevated (660 mV versus 590 mV @ 1 A), a variation within acceptable tolerance for Schottky diode specifications.

Packaging format differs between the two parts: SDM1A40LP8-7 is supplied in standard packaging, while SDM1M40LP8-7 is supplied in Tape & Reel (TR) format, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SDM1M40LP8-7 directly replace the SDM1A40LP8-7 in existing designs?

A: Yes. Both parts share identical voltage ratings (40 V), current ratings (1 A), package type (2-UFDFN), and thermal operating range (-65°C ~ 150°C). The SDM1M40LP8-7 is the active equivalent and functions as a direct substitute.

Q: What is the significance of the difference in forward voltage between these parts?

A: The SDM1A40LP8-7 specifies 590 mV @ 1 A forward voltage, while the SDM1M40LP8-7 specifies 660 mV @ 1 A. This 70 mV difference is within normal manufacturing tolerance for Schottky diodes and does not affect functional compatibility. Circuit designs must account for forward voltage within their power budget calculations.

Q: Why does the SDM1M40LP8-7 have a lower reverse recovery time?

A: The SDM1M40LP8-7 exhibits 8.4 ns reverse recovery time compared to 14 ns for the SDM1A40LP8-7. This represents an improvement in switching performance and is not a limitation for substitution. Applications benefit from faster switching characteristics.

Q: What is the difference between the packaging formats?

A: The SDM1A40LP8-7 is supplied in standard packaging, while the SDM1M40LP8-7 is supplied in Tape & Reel (TR) format. Tape & Reel packaging is optimized for automated pick-and-place assembly. Both formats contain identical components; the difference is in delivery and handling method.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the SDM1A40LP8-7 and SDM1M40LP8-7 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: Why is the SDM1A40LP8-7 classified as obsolete?

A: The SDM1A40LP8-7 is no longer in active production. The SDM1M40LP8-7 is the current active product from Diodes Incorporated for this specification class and is the recommended selection for new designs and ongoing procurement.

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