STTA306B-TR Equivalent & Substitute Parts

Part Overview

The STTA306B-TR is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 3 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 part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.85 V @ 3 A	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	20	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction (Max)	125	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the STTA306B-TR is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 600 V
Package / Case: Must be TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type: Must be Surface Mount
Technology: Must be Standard rectifier diode technology
RoHS Status: Must be ROHS3 Compliant

Secondary Compatibility Parameters:

Current - Average Rectified (Io): Substitute parts rated at 3 A or higher are electrically compatible
Voltage - Forward (Vf): Lower forward voltage drop indicates improved performance
Reverse Recovery Time (trr): Faster recovery time (lower trr value) indicates improved switching characteristics
Current - Reverse Leakage @ Vr: Lower leakage current indicates improved performance
Operating Temperature - Junction: Higher maximum junction temperature provides extended operational range

Substitute parts are grouped based on current rating capability. Parts with current ratings of 4 A, 5 A, 6 A, and 12 A all satisfy the minimum 3 A requirement of the original part while maintaining identical voltage and package specifications.

Parameter Comparison

Parameter	STTA306B-TR	RF505BM6STL	VS-12EWH06FN-M3	VS-12EWH06FNTRR-M3	VS-5EWX06FNTRR-M3	VS-6EWX06FNHM3	VS-6EWX06FNTRR-M3	VS-HFA04SD60STR-M3
Manufacturer	STMicroelectronics	Rohm Semiconductor	Vishay	Vishay	Vishay	Vishay	Vishay	Vishay
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	3 A	5 A	12 A	12 A	5 A	6 A	6 A	4 A
Voltage - Forward (Vf) (Max) @ If	1.85 V @ 3 A	1.7 V @ 5 A	2.5 V @ 12 A	2.5 V @ 12 A	2.9 V @ 5 A	3.1 V @ 6 A	3.1 V @ 6 A	1.8 V @ 4 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Standard Recovery > 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	50 ns	30 ns	-	26 ns	18 ns	19 ns	21 ns	42 ns
Current - Reverse Leakage @ Vr	20 µA @ 600 V	10 µA @ 600 V	10 µA @ 600 V	10 µA @ 600 V	20 µA @ 600 V	20 µA @ 600 V	20 µA @ 600 V	3 µA @ 600 V
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	TO-252-3, DPAK	TO-252-3, DPAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction (Max)	125 °C	150 °C	175 °C	175 °C	175 °C	175 °C	175 °C	150 °C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	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)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All identified substitute parts maintain full electrical and mechanical compatibility with the STTA306B-TR within the specified parameter constraints. Selection among substitute options is determined by application-specific requirements and product status considerations.

Active Product Status Advantage: All substitute parts listed carry Active product status, ensuring continued availability, manufacturing support, and long-term supply chain stability. The STTA306B-TR, classified as Obsolete, lacks these assurances.

Compliance and Certification: All substitute parts are ROHS3 Compliant and REACH Unaffected, matching the regulatory compliance profile of the original part. Moisture Sensitivity Level (MSL) is uniformly rated at 1 (Unlimited) across all parts, indicating no moisture-related handling restrictions.

Current Rating Selection: For direct functional replacement in existing designs, RF505BM6STL (Rohm Semiconductor, 5 A) and VS-HFA04SD60STR-M3 (Vishay, 4 A) provide the closest current ratings to the original 3 A specification while maintaining superior electrical characteristics.

Temperature Operating Range: Vishay FRED Pt® series parts (VS-12EWH06FN-M3, VS-12EWH06FNTRR-M3, VS-5EWX06FNTRR-M3, VS-6EWX06FNHM3, VS-6EWX06FNTRR-M3) offer extended operating temperature range (-65°C to 175°C) compared to the original part (maximum 125°C), providing enhanced thermal margin for demanding applications.

Packaging Format Consideration: VS-12EWH06FNTRR-M3, VS-5EWX06FNTRR-M3, and VS-6EWX06FNTRR-M3 are supplied in Tape & Reel (TR) format, matching the original STTA306B-TR packaging. Alternative parts in Tube or Cut Tape formats require different handling and assembly procedures.

Reverse Recovery Time Performance: VS-5EWX06FNTRR-M3 (18 ns) and VS-6EWX06FNHM3 (19 ns) deliver the fastest reverse recovery times, indicating superior switching performance for high-frequency applications. VS-HFA04SD60STR-M3 (42 ns) and RF505BM6STL (30 ns) provide intermediate performance levels.

Reverse Leakage Current: VS-HFA04SD60STR-M3 exhibits the lowest reverse leakage current (3 µA @ 600 V), indicating superior blocking characteristics. RF505BM6STL and Vishay FRED Pt® 12 A variants (10 µA @ 600 V) provide improved leakage performance compared to the original specification (20 µA @ 600 V).

Frequently Asked Questions (FAQ)

Q: Can RF505BM6STL directly replace STTA306B-TR in existing PCB designs?

A: Yes. RF505BM6STL maintains identical voltage rating (600 V), package type (TO-252-3 DPAK), and mounting method (Surface Mount). The 5 A current rating exceeds the original 3 A specification, providing design margin. Forward voltage drop is lower (1.7 V @ 5 A versus 1.85 V @ 3 A), and reverse recovery time is faster (30 ns versus 50 ns). No PCB layout modifications are required.

Q: What is the difference between Tape & Reel (TR) and Tube packaging options?

A: Tape & Reel packaging supplies components on continuous carrier tape suitable for automated pick-and-place assembly equipment. Tube packaging supplies loose components in plastic tubes requiring manual handling or tray feeding. STTA306B-TR uses Tape & Reel format. Equivalent Tape & Reel options include VS-12EWH06FNTRR-M3, VS-5EWX06FNTRR-M3, and VS-6EWX06FNTRR-M3. Tube-packaged alternatives (VS-12EWH06FN-M3, VS-6EWX06FNHM3) require different assembly line integration.

Q: Why do some substitute parts have higher current ratings (12 A) than the original (3 A)?

A: Higher current ratings indicate greater thermal and electrical capacity. A 12 A rated diode can safely conduct 3 A with lower junction temperature rise and improved reliability margin. This is a performance enhancement, not a compatibility issue. The 600 V voltage rating and DPAK package remain identical, ensuring mechanical and electrical fit.

Q: Is the Vishay FRED Pt® series suitable for automotive applications?

A: VS-6EWX06FNHM3 carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. Other Vishay FRED Pt® variants (VS-12EWH06FN-M3, VS-12EWH06FNTRR-M3, VS-5EWX06FNTRR-M3, VS-6EWX06FNTRR-M3) do not carry explicit automotive qualification but maintain ROHS3 compliance and standard reliability certifications.

Q: What does "Fast Recovery ≤ 500ns, > 200mA" mean?

A: This classification indicates the diode exhibits fast recovery characteristics with reverse recovery time not exceeding 500 nanoseconds when switching currents greater than 200 milliamps. Fast recovery diodes are suitable for high-frequency switching applications. The STTA306B-TR and most substitute parts meet this specification, with actual reverse recovery times significantly faster (18 ns to 50 ns).

Q: Can VS-HFA04SD60STR-M3 replace STTA306B-TR in high-frequency switching circuits?

A: Yes. VS-HFA04SD60STR-M3 maintains the 600 V rating and DPAK package. The 4 A current rating exceeds the original 3 A specification. Reverse recovery time (42 ns) is faster than the original (50 ns), supporting improved switching performance. Forward voltage drop (1.8 V @ 4 A) is lower than the original (1.85 V @ 3 A), reducing power dissipation. The HEXFRED® series designation indicates optimized fast recovery characteristics.

Q: What is the significance of "ROHS3 Compliant" status?

A: ROHS3 Compliant indicates the component meets Restriction of Hazardous Substances Directive 3 requirements, restricting lead, cadmium, mercury, hexavalent chromium, and specified brominated flame retardants. All substitute parts carry identical ROHS3 compliance, ensuring regulatory equivalence for EU and global markets requiring RoHS certification.

Q: Why is operating temperature range important for diode selection?

A: Operating temperature range defines the maximum junction temperature at which the diode maintains specified electrical characteristics. The original STTA306B-TR is limited to 125°C maximum junction temperature. Substitute parts with higher limits (150°C or 175°C) provide greater thermal margin, reducing junction temperature rise at equivalent power dissipation and extending component lifespan in thermally demanding environments.

Q: Are all substitute parts available in equivalent quantities?

A: Inventory levels vary. RF505BM6STL (1293 pcs), VS-12EWH06FN-M3 (3762 pcs), and VS-12EWH06FNTRR-M3 (1136 pcs) are available in substantial quantities. VS-5EWX06FNTRR-M3 (979 pcs), VS-6EWX06FNTRR-M3 (1109 pcs), VS-6EWX06FNHM3 (718 pcs), and VS-HFA04SD60STR-M3 (706 pcs) are available in moderate quantities. Inventory status should be verified for production volume requirements.

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