BAW56T Equivalent & Substitute Parts

Part Overview

The BAW56T is a diode array featuring one pair of common anode configuration rated for 85 V DC reverse voltage and 75 mA average rectified current per diode. Manufactured by onsemi in SOT-523 surface mount package, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance. Substitute parts maintain functional compatibility through matching diode configuration, voltage rating, current capacity, and package form factor, while some alternatives offer enhanced specifications or active product status.

Key Parameters

Parameter	BAW56T Specification
Diode Configuration	1 Pair Common Anode
Voltage - DC Reverse (Vr) (Max)	85 V
Current - Average Rectified (Io) (per Diode)	75 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 50 mA
Reverse Recovery Time (trr)	4 ns
Current - Reverse Leakage @ Vr	2 µA @ 75 V
Operating Temperature - Junction (Max)	125°C
Mounting Type	Surface Mount
Package / Case	SOT-523
Technology	Standard
Speed Classification	Small Signal ≤ 200 mA (Io), Any Speed

Substitute Part Grouping Explanation

Substitution eligibility for the BAW56T is determined by the following critical parameters: diode configuration (common anode or common cathode), maximum DC reverse voltage rating, average rectified current capacity per diode, forward voltage characteristics, reverse recovery time, and surface mount package compatibility.

Primary substitution criteria:

Diode Configuration Match: Common anode configuration is preferred for direct functional replacement. Common cathode alternatives (BAV70T-7-F) require circuit redesign and are listed as functional equivalents only.
Voltage Rating: Substitute parts must maintain minimum 85 V DC reverse voltage rating or higher to ensure safe operation within the original design envelope.
Current Rating: Substitute parts must support minimum 75 mA average rectified current per diode. Parts with higher current ratings (200 mA) are acceptable as they provide design margin.
Package Compatibility: Surface mount packages (SOT-523, SOT-23-3, SC-70-3, SOT-883) are all compatible with modern PCB assembly processes. Package selection depends on available board real estate and assembly equipment.
Electrical Performance: Forward voltage, reverse recovery time, and reverse leakage characteristics must be within acceptable design tolerances for the application circuit.

Parameter Comparison

Parameter	BAW56T	BAW56LT1G	BAW56WT1G	BAV70T-7-F	BAW56M,315
Manufacturer	onsemi	onsemi	Motorola	Diodes Incorporated	Nexperia USA Inc.
Diode Configuration	1 Pair Common Anode	1 Pair Common Anode	1 Pair Common Anode	1 Pair Common Cathode	1 Pair Common Anode
Voltage - DC Reverse (Vr) (Max)	85 V	70 V	70 V	85 V	90 V
Current - Average Rectified (Io) (per Diode)	75 mA	200 mA	200 mA	75 mA	150 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 50 mA	1.25 V @ 150 mA	1.25 V @ 150 mA	1 V @ 50 mA	1.25 V @ 150 mA
Reverse Recovery Time (trr)	4 ns	6 ns	6 ns	4 ns	4 ns
Current - Reverse Leakage @ Vr	2 µA @ 75 V	2.5 µA @ 70 V	2.5 µA @ 70 V	2 µA @ 75 V	500 nA @ 80 V
Operating Temperature - Junction	125°C (Max)	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	150°C (Max)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOT-523	SOT-23-3	SC-70-3 (SOT-323)	SOT-523	SOT-883
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BAW56LT1G (onsemi, SOT-23-3): Active product status with ROHS3 compliance. Common anode configuration matches original design. Voltage rating of 70 V is below the 85 V specification of BAW56T; this part is suitable only for applications where the actual operating voltage does not exceed 70 V. Current rating of 200 mA exceeds the 75 mA requirement, providing design margin. Larger SOT-23-3 package requires PCB layout modification.

BAW56WT1G (Motorola, SC-70-3): Active product status. Common anode configuration matches original design. Voltage rating of 70 V is below the 85 V specification; application voltage must not exceed 70 V. Current rating of 200 mA provides margin above 75 mA requirement. SC-70-3 package is smaller than SOT-23-3, suitable for space-constrained layouts. Highest inventory availability (3,086,300 pcs).

BAV70T-7-F (Diodes Incorporated, SOT-523): Active product status with ROHS3 compliance. Identical package (SOT-523) to BAW56T. Voltage and current ratings match BAW56T specifications exactly (85 V, 75 mA). Common cathode configuration requires circuit redesign; this part is not a direct pin-compatible replacement. Suitable for new designs or redesigned circuits where common cathode topology is acceptable.

BAW56M,315 (Nexperia USA Inc., SOT-883): Active product status with ROHS3 compliance and AEC-Q101 automotive qualification. Common anode configuration matches original design. Voltage rating of 90 V exceeds BAW56T specification, providing margin. Current rating of 150 mA exceeds 75 mA requirement. Reverse leakage of 500 nA @ 80 V is superior to BAW56T specification. SOT-883 package is smallest option, ideal for high-density applications. Limited inventory (758 pcs).

Frequently Asked Questions (FAQ)

Q: Can BAW56LT1G or BAW56WT1G be used as direct replacements for BAW56T?

A: Both parts maintain common anode configuration and surface mount technology. However, both have maximum DC reverse voltage ratings of 70 V, which is 15 V below the BAW56T specification of 85 V. These parts are suitable only if the actual circuit operating voltage does not exceed 70 V. If the design requires 85 V rating, these parts are not appropriate substitutes.

Q: What is the difference between BAV70T-7-F and BAW56T?

A: Both parts share identical electrical specifications (85 V, 75 mA, 4 ns recovery time, SOT-523 package). The critical difference is diode configuration: BAW56T uses common anode configuration while BAV70T-7-F uses common cathode configuration. This difference requires circuit redesign and is not a pin-compatible replacement. BAV70T-7-F is suitable for new designs or when circuit topology can be modified.

Q: Why does BAW56M,315 have lower reverse leakage than BAW56T?

A: BAW56M,315 specifies reverse leakage of 500 nA @ 80 V compared to BAW56T at 2 µA @ 75 V. This represents superior leakage performance and is a result of different manufacturing processes and device design. Lower reverse leakage is beneficial for applications requiring minimal standby current.

Q: Are all substitute parts RoHS compliant?

A: BAW56LT1G, BAV70T-7-F, and BAW56M,315 are specified as ROHS3 compliant. BAW56WT1G does not specify RoHS status in the provided data. For applications requiring RoHS compliance, BAW56LT1G, BAV70T-7-F, or BAW56M,315 are appropriate selections.

Q: Which substitute part has the best availability?

A: BAW56WT1G has the highest inventory with 3,086,300 pcs in stock. BAW56LT1G has 305,200 pcs. BAV70T-7-F has 17,386 pcs. BAW56M,315 has the lowest inventory at 758 pcs.

Q: Can I use BAW56M,315 in automotive applications?

A: BAW56M,315 carries AEC-Q101 automotive qualification, making it suitable for automotive applications. Other substitute parts do not specify automotive qualification in the provided data.

Q: What package considerations should I evaluate?

A: BAW56T uses SOT-523 package. Substitute parts use SOT-23-3 (larger), SC-70-3 (smaller), or SOT-883 (smallest). Package selection depends on available PCB real estate, assembly equipment capability, and thermal requirements. Smaller packages (SC-70-3, SOT-883) are suitable for high-density designs. Larger packages (SOT-23-3) may be easier to hand-solder for prototyping.

Q: Is BAW56T still available for purchase?

A: BAW56T is classified as obsolete. While 20,300 pcs are reported in stock, long-term availability is not guaranteed. For new designs or production continuity, selection of an active substitute part (BAW56LT1G, BAW56WT1G, BAV70T-7-F, or BAW56M,315) is recommended.

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