SS33HE3/9AT Equivalent & Substitute Parts

Part Overview

The SS33HE3/9AT is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 30 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. The diode exhibits fast recovery characteristics with forward voltage of 500 mV at 3 A and reverse leakage current of 500 µA at 30 V, operating across a junction temperature range of -55°C to 125°C.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	mV
Current - Reverse Leakage @ Vr	500 µA @ 30 V	µA
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS33HE3/9AT is determined by strict electrical and mechanical parameter matching within the Schottky diode rectifier category. The critical parameters that define substitutability are:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 500 mV @ 3 A (with tolerance for minor variations)
Current - Reverse Leakage @ Vr: ≤ 500 µA @ 30 V
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Parameters:

Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C minimum to 125°C minimum

Substitute parts are grouped into the following categories:

Parametric Equivalents (Vishay): Parts SS33-E3/57T, SS33-E3/9AT, and SS33-M3/57T, SS33-M3/9AT maintain identical electrical specifications and packaging, with differences only in tape/reel configurations and product status (active vs. obsolete).

Direct Manufacturer Equivalent (Micro Commercial Co): SK33-TP provides equivalent electrical performance with identical package specifications, though with extended operating temperature range (-55°C to 150°C) and slightly different reverse leakage characteristics.

Upgrade/Alternative Options: SS33 (Fairchild Semiconductor), 5821SMJ/TR13 (Microchip Technology), MBRS330T3G (onsemi), and SK153-TP (Micro Commercial Co) provide electrical equivalence with variations in reverse leakage current, forward voltage, and operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Package	Tj (Min-Max) [°C]	Product Status	RoHS
SS33HE3/9AT	Vishay	30	3	500 @ 3A	500 @ 30V	DO-214AB	-55 to 125	Obsolete	ROHS3
SS33-E3/57T	Vishay	30	3	500 @ 3A	500 @ 30V	DO-214AB	-55 to 125	Active	ROHS3
SS33-E3/9AT	Vishay	30	3	500 @ 3A	500 @ 30V	DO-214AB	-55 to 125	Active	ROHS3
SS33-M3/57T	Vishay	30	3	500 @ 3A	500 @ 30V	DO-214AB	-55 to 125	Active	ROHS3
SS33-M3/9AT	Vishay	30	3	500 @ 3A	500 @ 30V	DO-214AB	-55 to 125	Active	ROHS3
SK33-TP	Micro Commercial Co	30	3	500 @ 3A	500 @ 30V	DO-214AB	-55 to 150	Not For New Designs	ROHS3
SS33	Fairchild Semiconductor	30	3	500 @ 3A	500 @ 30V	DO-214AB	-55 to 150	Active	—
5821SMJ/TR13	Microchip Technology	30	3	480 @ 3A	1500 @ 30V	DO-214AB	-55 to 150	Active	Non-compliant
MBRS330T3G	onsemi	30	3	500 @ 3A	2000 @ 30V	DO-214AB	-65 to 150	Active	ROHS3
SK153-TP	Micro Commercial Co	30	15	550 @ 15A	1000 @ 30V	DO-214AB	-55 to 125	Obsolete	ROHS3
SK53L-TP	Micro Commercial Co	30	5	550 @ 5A	1000 @ 30V	DO-214AB	-55 to 150	Not For New Designs	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

SS33-E3/9AT and SS33-E3/57T from Vishay are the preferred direct substitutes for the obsolete SS33HE3/9AT. These parts maintain identical electrical specifications and packaging while offering active product status. The difference between these two variants is packaging configuration: SS33-E3/9AT is supplied in 9-inch tape and reel format, while SS33-E3/57T is supplied in 5.7-inch tape and reel format. Both are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1).

SS33-M3/57T and SS33-M3/9AT are additional Vishay alternatives with identical electrical and mechanical specifications, differing only in tape/reel packaging configurations.

Secondary Substitutes (Electrical Equivalents with Extended Temperature Range):

SK33-TP (Micro Commercial Co) provides electrical equivalence with extended operating temperature range (-55°C to 150°C) compared to the original part (-55°C to 125°C). This part is classified as "Not For New Designs" but remains available in inventory. ROHS3 compliance is maintained.

SS33 (Fairchild Semiconductor) offers electrical equivalence with extended operating temperature range (-55°C to 150°C) and active product status. This part is available in bulk packaging and provides the highest inventory availability (26,200 pcs).

Alternative Substitutes (Electrical Equivalence with Parameter Variations):

5821SMJ/TR13 (Microchip Technology) provides electrical equivalence with slightly lower forward voltage (480 mV @ 3 A) and higher reverse leakage current (1.5 mA @ 30 V). This part is RoHS non-compliant and should be selected only when RoHS compliance is not a design requirement.

MBRS330T3G (onsemi) provides electrical equivalence with extended operating temperature range (-65°C to 150°C) and higher reverse leakage current (2 mA @ 30 V). This part is ROHS3 compliant and offers the highest inventory availability among alternative manufacturers (20,442 pcs).

Not Recommended for Direct Substitution:

SK153-TP and SK53L-TP are not suitable direct substitutes due to current rating differences (15 A and 5 A respectively, versus 3 A for the original part). These parts are listed in the substitute network but represent different device classes within the Schottky rectifier family.

Frequently Asked Questions (FAQ)

Q: Can SS33-E3/9AT be used as a direct replacement for SS33HE3/9AT?

A: Yes. SS33-E3/9AT is a direct parametric equivalent with identical electrical specifications (30 V, 3 A, 500 mV forward voltage, 500 µA reverse leakage) and identical DO-214AB package. The primary difference is product status: SS33HE3/9AT is obsolete while SS33-E3/9AT is active. Both are ROHS3 compliant with MSL 1.

Q: What is the difference between SS33-E3/57T and SS33-E3/9AT?

A: Both parts are electrically and mechanically identical. The difference is in tape and reel packaging: SS33-E3/57T uses 5.7-inch tape and reel format, while SS33-E3/9AT uses 9-inch tape and reel format. Selection depends on assembly equipment compatibility and procurement requirements.

Q: Can SK33-TP replace SS33HE3/9AT in all applications?

A: SK33-TP is electrically equivalent with identical voltage, current, and forward voltage specifications. However, it offers extended operating temperature range (-55°C to 150°C versus -55°C to 125°C). SK33-TP is classified as "Not For New Designs," indicating it may have limited long-term availability. For new designs, Vishay SS33-E3 variants are preferred.

Q: Why does MBRS330T3G have higher reverse leakage current (2 mA) compared to the original part (500 µA)?

A: Reverse leakage current variation is a characteristic difference between manufacturers and device families. MBRS330T3G from onsemi maintains the same voltage and current ratings but exhibits higher reverse leakage. This difference is within acceptable limits for most rectifier applications but should be evaluated for low-leakage-sensitive circuits.

Q: Is 5821SMJ/TR13 suitable for RoHS-compliant applications?

A: No. 5821SMJ/TR13 is marked as RoHS non-compliant. For RoHS-compliant designs, select from ROHS3-compliant alternatives: SS33-E3/9AT, SS33-E3/57T, SS33-M3/57T, SS33-M3/9AT, SK33-TP, MBRS330T3G, or SK153-TP.

Q: What is the significance of the MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates that the component has unlimited shelf life and does not require special moisture control during storage or handling. This simplifies inventory management and reduces risk of moisture-related failures during assembly.

Q: Can SK153-TP be used as a substitute for higher current applications?

A: SK153-TP is rated for 15 A average rectified current, compared to 3 A for SS33HE3/9AT. While it maintains the same 30 V reverse voltage rating and DO-214AB package, it is a different device class. SK153-TP should not be used as a direct substitute for 3 A applications; it is intended for higher current rectification circuits.

Q: What packaging options are available for Vishay SS33 equivalents?

A: Vishay offers SS33-E3 and SS33-M3 variants in two tape and reel configurations: 5.7-inch (57T) and 9-inch (9AT) formats. Selection depends on assembly line equipment specifications and procurement volume requirements. Both configurations are electrically identical.

Q: Is the extended temperature range of SS33 (Fairchild) beneficial for all applications?

A: The extended operating temperature range (-55°C to 150°C versus -55°C to 125°C) provides additional thermal margin for high-temperature environments. However, for applications operating within the original temperature range, this extended capability offers no functional advantage. Selection should be based on actual application requirements and availability.

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