STTA506B Equivalent & Substitute Parts

Part Overview

The STTA506B is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 5 A average rectified current in a Surface Mount DPAK package. This component belongs to the TURBOSWITCH™ series and features fast recovery characteristics with a reverse recovery time of 50 ns. The STTA506B is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	1.75 @ 5 A	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the STTA506B is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 5 A minimum
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type: Surface Mount
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: May vary within design margin
Reverse Recovery Time (trr): Lower values acceptable (improved performance)
Current - Reverse Leakage @ Vr: Lower values acceptable (improved performance)
Operating Temperature - Junction: Extended range acceptable
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories:

Category 1: Direct Current Rating Match (5 A) Parts with 5 A average rectified current rating matching the STTA506B specification.

Category 2: Higher Current Rating (6 A and above) Parts with current ratings exceeding 5 A, suitable for applications where the STTA506B current capacity is adequate but higher margin is desired.

Parameter Comparison

Parameter	STTA506B	MURHD560W1T4G	VS-5EWX06FNTRR-M3	VS-6EWX06FNHM3	VS-12EWH06FNTRR-M3	VS-HFA04SD60SRHM3
Manufacturer	STMicroelectronics	onsemi	Vishay	Vishay	Vishay	Vishay
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	5 A	5 A	5 A	6 A	12 A	4 A
Voltage - Forward (Vf) (Max) @ If	1.75 V @ 5 A	2.7 V @ 5 A	2.9 V @ 5 A	3.1 V @ 6 A	2.5 V @ 12 A	1.8 V @ 4 A
Reverse Recovery Time (trr)	50 ns	30 ns	18 ns	19 ns	26 ns	42 ns
Current - Reverse Leakage @ Vr	100 µA @ 600 V	10 µA @ 600 V	20 µA @ 600 V	20 µA @ 600 V	10 µA @ 600 V	3 µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	150°C (Max)	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Product Status	Obsolete	Active	Active	Active	Active	Active
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)
AEC-Q101 Automotive Qualification	—	—	—	Yes	—	Yes

Engineering Selection Recommendations

Primary Substitute - Direct Replacement (5 A Rating):

The VS-5EWX06FNTRR-M3 (Vishay FRED Pt® series) is the recommended direct substitute for the STTA506B. This part maintains the 5 A average rectified current rating, 600 V reverse voltage specification, and DPAK package configuration. The VS-5EWX06FNTRR-M3 is in active product status with ROHS3 compliance and MSL 1 rating. The reverse recovery time of 18 ns is superior to the original 50 ns specification, providing improved switching performance. The part is available in Tape & Reel packaging with 979 pieces in stock.

Secondary Substitute - Enhanced Performance (5 A Rating):

The MURHD560W1T4G (onsemi MEGAHERTZ™ series) provides equivalent electrical performance at the 5 A rating with 600 V reverse voltage and DPAK package. This part features a 30 ns reverse recovery time and is in active product status. The MURHD560W1T4G offers extended operating temperature range (-65°C to 175°C) and is available in Cut Tape and Digi-Reel® packaging with 10,300 pieces in stock.

Higher Current Alternatives:

The VS-6EWX06FNHM3 (6 A rating) and VS-12EWH06FNTRR-M3 (12 A rating) are suitable for applications where the STTA506B current capacity is adequate but additional design margin is required. Both parts maintain 600 V reverse voltage, DPAK package, and fast recovery characteristics. The VS-6EWX06FNHM3 includes AEC-Q101 automotive qualification. The VS-12EWH06FNTRR-M3 features a 26 ns reverse recovery time and extended temperature range (-65°C to 175°C).

Lower Current Alternative:

The VS-HFA04SD60SRHM3 (4 A rating) is suitable only for applications where the 5 A requirement can be reduced. This part includes AEC-Q101 automotive qualification and features the lowest reverse leakage current (3 µA) among all substitutes. Operating temperature range extends to -65°C to 175°C.

All substitute parts are ROHS3 compliant, MSL 1 rated, and available in active product status, ensuring long-term supply continuity and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the VS-5EWX06FNTRR-M3 be used as a direct replacement for the STTA506B?

A: Yes. The VS-5EWX06FNTRR-M3 meets all mandatory electrical and mechanical specifications: 600 V reverse voltage, 5 A average rectified current, fast recovery characteristics, and TO-252-3 DPAK package. The part is in active product status with superior reverse recovery time (18 ns versus 50 ns), providing improved performance.

Q: What is the difference between the MURHD560W1T4G and VS-5EWX06FNTRR-M3?

A: Both parts meet the STTA506B specifications at 5 A and 600 V. The MURHD560W1T4G (onsemi) has a 30 ns reverse recovery time, while the VS-5EWX06FNTRR-M3 (Vishay) has 18 ns. The MURHD560W1T4G offers higher stock availability (10,300 pieces) and extended temperature range. Selection depends on performance requirements and packaging preference (Cut Tape versus Tape & Reel).

Q: Can I use the VS-12EWH06FNTRR-M3 (12 A) instead of the STTA506B (5 A)?

A: Yes, for applications where the STTA506B current capacity is adequate. The VS-12EWH06FNTRR-M3 maintains 600 V reverse voltage and DPAK package compatibility. The higher current rating provides additional design margin but may result in different thermal characteristics. Forward voltage at rated current differs (2.5 V @ 12 A versus 1.75 V @ 5 A), which affects power dissipation calculations.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the STTA506B compliance status.

Q: What is the significance of the reverse recovery time (trr) difference?

A: Reverse recovery time affects switching speed and electromagnetic interference (EMI) characteristics. The STTA506B has 50 ns trr. Substitute parts with lower trr values (18 ns to 42 ns) provide faster switching transitions, reducing switching losses and EMI. Lower trr is beneficial in high-frequency applications but does not prevent substitution in standard applications.

Q: Can I substitute the STTA506B with the VS-HFA04SD60SRHM3 (4 A)?

A: The VS-HFA04SD60SRHM3 has a lower current rating (4 A) than the STTA506B (5 A). Substitution is only acceptable if the application current requirement is confirmed to be 4 A or less. This part offers superior reverse leakage current (3 µA) and AEC-Q101 automotive qualification.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube (VS-12EWH06FN-M3, VS-6EWX06FNHM3, VS-HFA04SD60SRHM3), Tape & Reel (VS-5EWX06FNTRR-M3, VS-12EWH06FNTRR-M3), and Cut Tape with Digi-Reel® (MURHD560W1T4G). Selection depends on production volume and assembly process requirements.

Q: Are any substitute parts qualified for automotive applications?

A: Yes. The VS-6EWX06FNHM3 and VS-HFA04SD60SRHM3 include AEC-Q101 automotive qualification. These parts are suitable for automotive-grade applications requiring enhanced reliability and qualification documentation.

Q: What is the inventory status of substitute parts?

A: All substitute parts are in active product status with available inventory: MURHD560W1T4G (10,300 pieces), VS-12EWH06FN-M3 (3,762 pieces), VS-12EWH06FNTRR-M3 (1,136 pieces), VS-5EWX06FNTRR-M3 (979 pieces), VS-6EWX06FNHM3 (718 pieces), and VS-HFA04SD60SRHM3 (809 pieces).

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