SS24F-HF Equivalent & Substitute Parts

Part Overview

The SS24F-HF is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40 V DC reverse voltage and 2 A average rectified current in a surface mount SMAF package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the DO-214AC (SMA) package family. Alternative sources become necessary for supply chain continuity, inventory availability, or specific manufacturing requirements.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	500	mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS24F-HF is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 2 A
Technology: Schottky
Package / Case: DO-214AC, SMA
Operating Temperature - Junction: -55°C to 150°C
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: 500 mV to 550 mV @ 2 A
Current - Reverse Leakage @ Vr: 200 µA to 500 µA @ 40 V
Capacitance @ Vr, F: 93 pF to 200 pF @ 4V, 1MHz
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

All identified substitute parts meet the mandatory matching criteria. Variations in forward voltage, reverse leakage current, and junction capacitance remain within acceptable engineering tolerances for this component category.

Parameter Comparison

Parameter	SS24F-HF (Comchip)	B240AE-13 (Diodes Inc.)	SK24A (Good-Ark)	SR24-AU_R1_000A1 (Panjit)	SR24_R1_00001 (Panjit)	SSA24 (onsemi)
Manufacturer	Comchip Technology	Diodes Incorporated	Good-Ark Semiconductor	Panjit International Inc.	Panjit International Inc.	onsemi
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	2 A	2 A	2 A	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	500 mV @ 2 A	550 mV @ 2 A	500 mV @ 2 A	500 mV @ 2 A	500 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V	200 µA @ 40 V	200 µA @ 40 V	200 µA @ 40 V	200 µA @ 40 V	200 µA @ 40 V
Capacitance @ Vr, F	160 pF @ 4V, 1MHz	93 pF @ 4V, 1MHz	200 pF @ 4V, 1MHz	98 pF @ 4V, 1MHz	Not specified	Not specified
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Not For New Designs
Automotive Grade	Not specified	Not specified	Yes (AEC-Q101)	Yes (AEC-Q101)	Not specified	Yes (AEC-Q101)

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

B240AE-13 (Diodes Incorporated), SR24-AU_R1_000A1 (Panjit International Inc.), and SR24_R1_00001 (Panjit International Inc.) are direct parametric equivalents with Active product status. These parts maintain identical electrical specifications and are ROHS3 compliant with MSL 1 rating. B240AE-13 offers the lowest reverse leakage current (200 µA) and lowest junction capacitance (93 pF), which may provide performance advantages in low-leakage or high-frequency applications. The Panjit SR24 variants provide high inventory availability and are qualified to AEC-Q101 automotive standards.

Secondary Substitutes (Automotive Qualified):

SK24A (Good-Ark Semiconductor) and SSA24 (onsemi) are automotive-grade alternatives with AEC-Q101 qualification. SK24A exhibits slightly elevated forward voltage (550 mV @ 2 A) and higher junction capacitance (200 pF), which may impact thermal performance and switching characteristics in specific circuit topologies. SSA24 carries Not For New Designs status and should be used only for legacy system maintenance or replacement applications.

Selection Criteria:

For new designs, select from B240AE-13, SR24-AU_R1_000A1, or SR24_R1_00001. For automotive applications requiring AEC-Q101 qualification, SK24A or SSA24 are qualified alternatives. Inventory availability and lead time considerations favor SR24_R1_00001 (200,992 pcs in stock) and SK24A (289,900 pcs in stock) for high-volume procurement.

Frequently Asked Questions (FAQ)

Q: Can B240AE-13 replace SS24F-HF in all applications?

A: B240AE-13 is a parametric equivalent with identical voltage and current ratings, matching operating temperature range, and ROHS3 compliance. The lower reverse leakage current (200 µA vs. 500 µA) and lower junction capacitance (93 pF vs. 160 pF) make it suitable for direct substitution. Verify circuit design does not depend on the higher leakage or capacitance characteristics of the original part.

Q: What is the difference between SR24-AU_R1_000A1 and SR24_R1_00001?

A: Both are Panjit International Inc. Schottky diodes with identical electrical specifications (40 V, 2 A, 500 mV forward voltage, 200 µA reverse leakage). SR24-AU_R1_000A1 specifies junction capacitance at 98 pF @ 4V, 1MHz, while SR24_R1_00001 does not provide capacitance data. Both are AEC-Q101 qualified and ROHS3 compliant. Selection depends on whether junction capacitance specification is required for circuit analysis.

Q: Why is SSA24 marked "Not For New Designs"?

A: SSA24 carries Not For New Designs status, indicating onsemi has designated this part for legacy support only. While electrically equivalent and AEC-Q101 qualified, new circuit designs should utilize active alternatives such as B240AE-13, SK24A, or SR24 variants to ensure long-term supply availability and manufacturer support.

Q: Are all substitute parts in the same package?

A: All substitute parts use the DO-214AC (SMA) surface mount package, which is mechanically and electrically compatible with the SS24F-HF SMAF package designation. Footprint and reflow soldering parameters are identical across all listed alternatives.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is the Automotive Electronics Council qualification standard for discrete semiconductors. SK24A, SR24-AU_R1_000A1, and SSA24 carry this qualification, indicating compliance with automotive reliability, temperature cycling, and quality standards. This qualification is required for automotive applications but not mandatory for industrial or consumer electronics.

Q: Can SK24A be used if forward voltage tolerance is critical?

A: SK24A specifies maximum forward voltage of 550 mV @ 2 A, compared to 500 mV for the SS24F-HF and most other substitutes. This 50 mV difference may impact thermal dissipation and circuit performance in applications with tight voltage budgets. Verify circuit design margins before substitution.

Q: What inventory considerations apply to these substitutes?

A: SR24_R1_00001 offers the highest inventory (200,992 pcs), followed by SK24A (289,900 pcs) and SSA24 (23,200 pcs). B240AE-13 provides 2,232 pcs and SR24-AU_R1_000A1 provides 4,648 pcs. For high-volume procurement or extended lead time mitigation, prioritize parts with higher stock levels.

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