BAT54W-HG3-08 Equivalent & Substitute Parts

Part Overview

The BAT54W-HG3-08 is a Schottky diode rated for 30 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-123 package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is qualified to AEC-Q101 automotive standards and complies with RoHS3 and REACH regulations.

The BAT54W-HG3-08 carries a Last Time Buy product status, indicating that this specific part number will no longer be manufactured after existing inventory is depleted. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications currently utilizing this component.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io)	200 mA
Voltage - Forward (Vf) (Max) @ If	800 mV @ 100 mA
Reverse Recovery Time (trr)	5 ns
Current - Reverse Leakage @ Vr	2 µA @ 25 V
Capacitance @ Vr, F	10 pF @ 1 V, 1 MHz
Operating Temperature - Junction	125°C
Package / Case	SOD-123
Technology	Schottky
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the BAT54W-HG3-08 is determined by matching the following critical electrical and mechanical parameters:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 200 mA
Voltage - Forward (Vf) (Max) @ If: 800 mV @ 100 mA
Reverse Recovery Time (trr): 5 ns
Current - Reverse Leakage @ Vr: 2 µA @ 25 V
Capacitance @ Vr, F: 10 pF @ 1 V, 1 MHz

Mechanical Parameters:

Mounting Type: Surface Mount
Technology: Schottky

Compliance Parameters:

Grade: Automotive
Qualification: AEC-Q101 or equivalent automotive qualification
RoHS Status: RoHS3 Compliant
REACH Status: REACH Unaffected

Substitute parts are grouped into two categories: direct package equivalents (SOD-123) and alternative package options (SOD-882/DFN1006BD-2) that maintain identical electrical performance while offering different form factors and thermal characteristics.

Parameter Comparison

Parameter	BAT54W-HG3-08	BAT54W-HG3_A-08	BAT54W-HG3-18	BAT54LS-QYL	BAT54LSYL
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay	Vishay General Semiconductor - Diodes Division	Nexperia USA Inc.	Nexperia USA Inc.
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V	30 V	30 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	800 mV @ 100 mA	800 mV @ 100 mA	800 mV @ 100 mA	800 mV @ 100 mA	800 mV @ 100 mA
Reverse Recovery Time (trr)	5 ns	5 ns	5 ns	5 ns	5 ns
Current - Reverse Leakage @ Vr	2 µA @ 25 V	2 µA @ 25 V	2 µA @ 25 V	2 µA @ 25 V	2 µA @ 25 V
Capacitance @ Vr, F	10 pF @ 1 V, 1 MHz	10 pF @ 1 V, 1 MHz	10 pF @ 1 V, 1 MHz	10 pF @ 1 V, 1 MHz	10 pF @ 1 V, 1 MHz
Package / Case	SOD-123	SOD-123	SOD-123	SOD-882	SOD-882
Operating Temperature - Junction	125°C	125°C	125°C	150°C	150°C
Product Status	Last Time Buy	Active	Last Time Buy	Active	Active
Qualification	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q100	Not specified
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not specified	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

Direct Package Equivalent (SOD-123):

The BAT54W-HG3_A-08 is the primary recommended substitute for the BAT54W-HG3-08. Both parts share identical electrical specifications, automotive qualification (AEC-Q101), and SOD-123 package geometry. The BAT54W-HG3_A-08 maintains Active product status, ensuring long-term availability. This part requires no PCB layout modifications and provides drop-in compatibility.

The BAT54W-HG3-18 is a parametric equivalent with identical electrical performance and SOD-123 packaging. However, this part carries Last Time Buy status, similar to the original BAT54W-HG3-08, and therefore does not resolve supply continuity concerns.

Alternative Package Options (SOD-882/DFN1006BD-2):

The BAT54LS-QYL and BAT54LSYL are Nexperia alternatives that maintain all critical electrical parameters while offering a smaller SOD-882 package footprint. Both parts are qualified to automotive standards (AEC-Q100 for BAT54LS-QYL) and carry Active product status. The BAT54LS-QYL and BAT54LSYL support higher junction temperatures (150°C versus 125°C), providing enhanced thermal performance.

Selection of SOD-882 alternatives requires PCB layout modification to accommodate the different package geometry. The BAT54LSYL offers unlimited moisture sensitivity (MSL 1), while the BAT54LS-QYL specifies MSL 3 (168 hours).

Frequently Asked Questions (FAQ)

Q: Can the BAT54W-HG3_A-08 be used as a direct replacement for the BAT54W-HG3-08?

A: Yes. The BAT54W-HG3_A-08 is electrically and mechanically identical to the BAT54W-HG3-08. Both parts feature 30 V reverse voltage rating, 200 mA average rectified current, SOD-123 package, and AEC-Q101 automotive qualification. No circuit modifications or PCB layout changes are required.

Q: What is the difference between the Vishay BAT54W-HG3 series and the Nexperia BAT54LS series?

A: Both series meet identical electrical specifications for 30 V, 200 mA Schottky diodes. The primary differences are manufacturer, package format, and operating temperature range. Vishay parts use SOD-123 packaging with 125°C maximum junction temperature. Nexperia parts use SOD-882 (DFN1006BD-2) packaging with 150°C maximum junction temperature. Nexperia parts are smaller and support higher thermal environments.

Q: Are PCB layout changes required when substituting with BAT54LS-QYL or BAT54LSYL?

A: Yes. The BAT54LS-QYL and BAT54LSYL use SOD-882 package geometry, which differs from the SOD-123 package of the original BAT54W-HG3-08. PCB footprint modifications are necessary. However, electrical performance remains identical, and these parts support higher junction temperatures (150°C).

Q: What does Last Time Buy status mean for the BAT54W-HG3-08?

A: Last Time Buy indicates that the manufacturer will discontinue production of this part number after existing inventory is exhausted. No new units will be manufactured. Designs currently using the BAT54W-HG3-08 should transition to the Active-status BAT54W-HG3_A-08 to ensure long-term supply availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (BAT54W-HG3_A-08, BAT54W-HG3-18, BAT54LS-QYL, and BAT54LSYL) are RoHS3 compliant and REACH unaffected, matching the environmental compliance of the original BAT54W-HG3-08.

Q: What is the difference in moisture sensitivity between substitute parts?

A: The BAT54W-HG3-08, BAT54W-HG3_A-08, BAT54W-HG3-18, and BAT54LSYL all specify MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The BAT54LS-QYL specifies MSL 3 (168 hours), requiring controlled storage and handling conditions. MSL 1 parts offer greater flexibility in manufacturing and storage environments.

Q: Can the BAT54W-HG3-18 be used instead of the BAT54W-HG3-08?

A: The BAT54W-HG3-18 is electrically and mechanically equivalent to the BAT54W-HG3-08. However, both parts carry Last Time Buy status. While substitution is technically valid, the BAT54W-HG3-18 does not resolve supply continuity concerns. The BAT54W-HG3_A-08 is the recommended choice for long-term availability.

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