BAT54W-HE3-08 Equivalent & Substitute Parts

Part Overview

The BAT54W-HE3-08 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 classified as Last Time Buy, indicating discontinued production with limited remaining inventory. Equivalent and substitute parts are necessary to ensure design continuity and long-term supply chain reliability for applications requiring Schottky rectification in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
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 @ 1V, 1MHz
Package / Case	SOD-123	—
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 BAT54W-HE3-08 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 200 mA
Technology: Schottky
Package / Case: SOD-123
Mounting Type: Surface Mount
Reverse Recovery Time (trr): 5 ns
Capacitance @ Vr, F: 10 pF @ 1V, 1MHz

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents (Vishay) Parts BAT54W-HE3_A-08, BAT54W-E3-08, BAT54W-E3-18, BAT54W-G3-08, and BAT54W-G3-18 maintain identical electrical specifications and SOD-123 packaging. These parts differ only in packaging format (Tape & Reel or Cut Tape) and product status (Active vs. Last Time Buy). All meet automotive qualification AEC-Q101 or equivalent compliance.

Category 2: Cross-Manufacturer Equivalents Parts BAT54T1G (onsemi), BAT42W-7-F (Diodes Incorporated), and BAT43W-7-F (Diodes Incorporated) meet all critical electrical parameters and SOD-123 packaging requirements. Forward voltage specifications differ slightly (1 V @ 200 mA vs. 800 mV @ 100 mA) and reverse leakage differs (500 nA vs. 2 µA), but remain within functional equivalence for Schottky rectification applications.

Category 3: Package Variant Part BAT54WQ-7-F (Diodes Incorporated) provides electrical equivalence in an alternative SOT-323 package for applications where smaller form factor is acceptable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If	trr [ns]	Ir @ Vr	Package	Product Status	Packaging Format
BAT54W-HE3-08	Vishay	30	200	800 mV @ 100 mA	5	2 µA @ 25 V	SOD-123	Last Time Buy	Tape & Reel
BAT54W-HE3_A-08	Vishay	30	200	800 mV @ 100 mA	5	2 µA @ 25 V	SOD-123	Active	Tape & Reel
BAT54W-E3-08	Vishay	30	200	800 mV @ 100 mA	5	2 µA @ 25 V	SOD-123	Active	Tape & Reel
BAT54W-E3-18	Vishay	30	200	800 mV @ 100 mA	5	2 µA @ 25 V	SOD-123	Active	Cut Tape
BAT54W-G3-08	Vishay	30	200	800 mV @ 100 mA	5	2 µA @ 25 V	SOD-123	Active	Cut Tape & Digi-Reel
BAT54W-G3-18	Vishay	30	200	800 mV @ 100 mA	5	2 µA @ 25 V	SOD-123	Active	Tape & Reel
BAT54T1G	onsemi	30	200	800 mV @ 100 mA	5	2 µA @ 25 V	SOD-123	Active	Cut Tape & Digi-Reel
BAT42W-7-F	Diodes Incorporated	30	200	1 V @ 200 mA	5	500 nA @ 25 V	SOD-123	Active	Cut Tape & Digi-Reel
BAT43W-7-F	Diodes Incorporated	30	200	1 V @ 200 mA	5	500 nA @ 25 V	SOD-123	Active	Cut Tape & Digi-Reel
BAT54WQ-7-F	Diodes Incorporated	30	200	1 V @ 100 mA	5	2 µA @ 25 V	SOT-323	Active	Tape & Reel

Engineering Selection Recommendations

Primary Recommendation: Vishay BAT54W-HE3_A-08

The BAT54W-HE3_A-08 is the direct active-production equivalent of the BAT54W-HE3-08. It maintains identical electrical specifications, automotive qualification (AEC-Q101), and SOD-123 packaging. This part is recommended as the first substitution choice due to product status transition from Last Time Buy to Active, ensuring long-term availability.

Secondary Recommendation: Vishay BAT54W-G3-08 or BAT54W-G3-18

Both BAT54W-G3 variants provide parametric equivalence with Active product status and higher inventory availability (21,315 and 9,024 units respectively). These parts are suitable for applications where packaging format flexibility (Cut Tape, Digi-Reel, or Tape & Reel) is acceptable.

Cross-Manufacturer Alternative: onsemi BAT54T1G

The BAT54T1G from onsemi provides electrical equivalence with the highest inventory availability (623,400 units). This part maintains identical forward voltage and reverse leakage specifications at the specified test conditions and is suitable for applications where manufacturer diversification is required.

Alternative for Diodes Incorporated Supply Chain: BAT42W-7-F or BAT43W-7-F

Both Diodes Incorporated parts meet all critical electrical parameters with Active product status. Forward voltage specification is 1 V @ 200 mA (compared to 800 mV @ 100 mA for Vishay parts) and reverse leakage is 500 nA (compared to 2 µA). These differences are within acceptable tolerance for Schottky rectification applications and do not affect functional compatibility.

Package Variant Option: Diodes Incorporated BAT54WQ-7-F

The BAT54WQ-7-F provides electrical equivalence in SOT-323 package format. This part is suitable only for applications where the smaller form factor is compatible with PCB layout and thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can BAT54W-HE3_A-08 be used as a direct replacement for BAT54W-HE3-08?

A: Yes. The BAT54W-HE3_A-08 is the direct active-production equivalent with identical electrical specifications, automotive qualification, and SOD-123 packaging. The only difference is product status (Active vs. Last Time Buy).

Q: What is the difference between Vishay BAT54W-E3-08 and BAT54W-G3-08?

A: Both parts are parametric equivalents with identical electrical specifications. The difference is packaging format: BAT54W-E3-08 is supplied in Tape & Reel only, while BAT54W-G3-08 is available in Cut Tape and Digi-Reel formats. Selection depends on assembly process requirements.

Q: Are onsemi BAT54T1G and Vishay BAT54W-HE3-08 functionally equivalent?

A: Yes. The BAT54T1G maintains identical electrical specifications for voltage rating, current capacity, reverse recovery time, and capacitance. Both are Schottky diodes in SOD-123 packages suitable for the same applications.

Q: How do Diodes Incorporated BAT42W-7-F and BAT43W-7-F differ from the original BAT54W-HE3-08?

A: Forward voltage is specified at different test conditions (1 V @ 200 mA vs. 800 mV @ 100 mA) and reverse leakage is higher (500 nA vs. 2 µA). These differences remain within functional equivalence for Schottky rectification. Both parts meet the 30 V, 200 mA, and 5 ns specifications.

Q: Can BAT54WQ-7-F replace BAT54W-HE3-08 in existing designs?

A: The BAT54WQ-7-F provides electrical equivalence but uses SOT-323 package instead of SOD-123. This part is suitable only if PCB layout and thermal design accommodate the smaller form factor. Footprint and land pattern changes are required.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 qualification indicates the part meets automotive-grade reliability standards. The BAT54W-HE3-08 and BAT54W-HE3_A-08 carry this qualification. Cross-manufacturer alternatives should be verified for equivalent automotive qualification if required by application specifications.

Q: Which substitute part has the highest inventory availability?

A: The onsemi BAT54T1G has the highest inventory availability at 623,400 units. Vishay BAT54W-G3-08 has 21,315 units. Inventory levels should be verified with suppliers for current availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and have MSL rating of 1 (Unlimited), matching the original BAT54W-HE3-08 specifications.

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