BYW29-200 Equivalent & Substitute Parts

Part Overview

The BYW29-200 is a general-purpose rectifier diode rated for 200 V DC reverse voltage and 8 A average rectified current in a Through Hole TO-220AC package. Manufactured by STMicroelectronics, this component is classified as Obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts are necessary for new designs and ongoing production requirements. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and mounting considerations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 10 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	10 µA @ 200 V	µA
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BYW29-200 are classified based on strict electrical and mechanical compatibility. The primary substitution criteria are:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 8 A
Mounting Type: Through Hole
Package / Case: TO-220-2 (physical compatibility)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max): Substitute values must not exceed the application's forward voltage tolerance
Reverse Recovery Time (trr): Faster recovery times (lower values) are acceptable
Current - Reverse Leakage @ Vr: Lower leakage currents are acceptable
Operating Temperature - Junction: Higher maximum ratings provide design margin

Substitute parts are grouped into two categories:

Direct Substitutes (Functionally Equivalent): Parts meeting all mandatory parameters with minimal variation in forward voltage and recovery characteristics.

Similar Substitutes (Functionally Compatible): Parts meeting all mandatory parameters with acceptable variations in secondary electrical characteristics or packaging format (Tube vs. Bulk).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Package	Status
BYW29-200	STMicroelectronics	200	8	1.15 @ 10 A	35	10 @ 200 V	150	TO-220AC	Obsolete
STTH802D	STMicroelectronics	200	8	1.05 @ 8 A	30	6 @ 200 V	175	TO-220AC	Active
BYW29-200G	onsemi	200	8	1.3 @ 20 A	35	5 @ 200 V	175	TO-220-2	Active
BYW29E-200,127	WeEn Semiconductors	200	8	1.05 @ 8 A	25	10 @ 200 V	150	TO-220AC	Active
MUR820-BP	Micro Commercial Co	200	8	0.975 @ 8 A	35	5 @ 200 V	150	TO-220AC	Active
MUR820G	onsemi	200	8	0.975 @ 8 A	35	5 @ 200 V	175	TO-220-2	Active
SDUR820	SMC Diode Solutions	200	8	1.2 @ 8 A	35	5 @ 200 V	150	TO-220AC	Active

Engineering Selection Recommendations

Primary Recommendation: STTH802D (STMicroelectronics)

STTH802D is the direct substitute for BYW29-200. Both parts are manufactured by STMicroelectronics, ensuring design continuity and supply chain consistency. STTH802D is Active status, providing long-term availability. It delivers improved electrical performance with lower forward voltage (1.05 V vs. 1.15 V), faster reverse recovery time (30 ns vs. 35 ns), and lower reverse leakage current (6 µA vs. 10 µA). Operating temperature rating is elevated to 175°C, providing additional thermal margin. ROHS3 compliance is maintained.

Secondary Recommendation: BYW29E-200,127 (WeEn Semiconductors)

BYW29E-200,127 maintains the same base product number (BYW29) and offers Active status with high inventory availability (61,550 pcs). Forward voltage and reverse recovery time match STTH802D specifications (1.05 V, 25 ns). Operating temperature remains at 150°C, matching the original BYW29-200. ROHS3 compliance is maintained. REACH status is Affected, requiring verification for applications subject to REACH regulations.

Tertiary Recommendation: MUR820G (onsemi)

MUR820G provides Active status with extended operating temperature range (-65°C to 175°C). Forward voltage is optimized at 0.975 V, reducing power dissipation. Reverse recovery time and leakage current specifications are equivalent to BYW29-200. ROHS3 compliance is maintained. REACH status is Unaffected. Packaging is TO-220-2 format (functionally equivalent to TO-220AC for Through Hole mounting).

Alternative Recommendation: MUR820-BP (Micro Commercial Co)

MUR820-BP is Active status with the lowest forward voltage specification (0.975 V @ 8 A), optimizing thermal performance. Packaging is Bulk format rather than Tube. Inventory availability is limited (992 pcs). Operating temperature range is -55°C to 150°C. REACH status is Unaffected. This option is suitable for applications prioritizing power efficiency over packaging convenience.

Compatibility Note: SDUR820 (SMC Diode Solutions)

SDUR820 meets all mandatory electrical parameters with forward voltage of 1.2 V @ 8 A. Current - Average Rectified (Io) specification is not provided in the data sheet, requiring verification before selection. REACH status is Affected. This part is suitable only when REACH compliance is not a design requirement.

Frequently Asked Questions (FAQ)

Q: Can STTH802D directly replace BYW29-200 without circuit modifications?

A: Yes. STTH802D meets all mandatory electrical parameters: 200 V reverse voltage, 8 A average rectified current, Fast Recovery speed classification, and Through Hole TO-220AC mounting. Improved electrical characteristics (lower forward voltage, faster recovery, lower leakage) provide enhanced performance without requiring circuit redesign.

Q: What is the difference between TO-220AC and TO-220-2 packaging?

A: Both designations refer to the same physical Through Hole package with two leads. TO-220AC and TO-220-2 are functionally equivalent for mounting and thermal management purposes. Pin configuration and PCB footprint compatibility are identical.

Q: Why is BYW29-200 classified as Obsolete?

A: Obsolete status indicates the part is no longer manufactured by STMicroelectronics and is not recommended for new designs. Existing inventory may be available from distributors, but long-term supply cannot be guaranteed. Active substitute parts ensure design continuity and production sustainability.

Q: Are all substitute parts ROHS3 compliant?

A: STTH802D, BYW29-200G, BYW29E-200,127, MUR820G, and MUR820-BP are ROHS3 compliant. SDUR820 is ROHS3 compliant. All substitute parts meet RoHS3 requirements for lead-free manufacturing.

Q: Which substitute part has the lowest forward voltage drop?

A: MUR820-BP and MUR820G both specify 0.975 V forward voltage @ 8 A, representing the lowest forward voltage among all substitute options. This characteristic reduces power dissipation and heat generation in the diode.

Q: What is the significance of Reverse Recovery Time (trr)?

A: Reverse recovery time is the interval required for a diode to transition from forward conduction to reverse blocking after the applied voltage reverses. Faster recovery times (lower trr values) reduce switching losses and electromagnetic interference in high-frequency applications. STTH802D (30 ns) and BYW29E-200,127 (25 ns) offer faster recovery than the original BYW29-200 (35 ns).

Q: Can I use BYW29-200G as a substitute if my application requires the SWITCHMODE™ series designation?

A: BYW29-200G is part of the onsemi SWITCHMODE™ series and meets all electrical parameters of BYW29-200. However, verify that your application does not have specific design requirements tied to the STMicroelectronics BYW29 series. If SWITCHMODE™ series qualification is required, BYW29-200G is the appropriate selection.

Q: What inventory considerations should guide my substitute part selection?

A: BYW29E-200,127 offers the highest inventory availability (61,550 pcs), followed by BYW29-200G (35,400 pcs) and MUR820G (17,140 pcs). STTH802D provides 13,877 pcs. MUR820-BP has limited availability (992 pcs). For high-volume production, BYW29E-200,127 or BYW29-200G are recommended to ensure supply continuity.

Q: Are there REACH compliance differences among substitute parts?

A: STTH802D, BYW29-200G, MUR820-BP, MUR820G, and SDUR820 have REACH status specified. STTH802D, MUR820-BP, and MUR820G are REACH Unaffected. BYW29-200G and SDUR820 are REACH Affected. For applications subject to REACH regulations, select REACH Unaffected parts: STTH802D, MUR820-BP, or MUR820G.

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