BAT54A_L99Z Equivalent & Substitute Parts

Part Overview

The BAT54A_L99Z is a Schottky diode array manufactured by onsemi, configured as 1 pair common anode with a maximum reverse voltage of 30 V and average rectified current of 200 mA per diode. The device is housed in a SOT-23-3 surface mount package and operates across a junction temperature range of -55°C to 150°C.

The BAT54A_L99Z is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. All substitute parts listed maintain electrical and mechanical compatibility with the original specification.

Substiute Parts

BAT54A_L99Z

onsemiIn Stock: 1030BAT54A_L99Z Datasheet

Current PartRFQ

BAT54A-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 35443BAT54A-E3-08 Datasheet

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BAT54A-E3-18

Vishay General Semiconductor - Diodes DivisionIn Stock: 6829BAT54A-E3-18 Datasheet

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BAT54AHE3-TP

Micro Commercial CoIn Stock: 3868BAT54AHE3-TP Datasheet

Parametric EquivalentRFQ

BAT54AQ-13

Diodes IncorporatedIn Stock: 882BAT54AQ-13 Datasheet

Parametric EquivalentRFQ

BAT54AQ-7-F

Diodes IncorporatedIn Stock: 6375BAT54AQ-7-F Datasheet

Parametric EquivalentRFQ

CBAT54A TR PBFREE

Central Semiconductor CorpIn Stock: 4846CBAT54A TR PBFREE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BAT54A_L99Z is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Diode Configuration: 1 Pair Common Anode
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 30 V
• Current - Average Rectified (Io) (per Diode): 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

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount
• Package / Case: TO-236-3, SC-59, SOT-23-3
• Supplier Device Package: SOT-23-3

Thermal Parameters (Must Meet or Exceed):

• Operating Temperature - Junction: Minimum -55°C, Maximum 150°C

All substitute parts listed below satisfy these criteria. Differences in product status (active vs. obsolete), manufacturer, packaging format (Tape & Reel), and optional certifications (RoHS, AEC-Q101) do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

For General Industrial Applications:

The BAT54A-E3-08 and BAT54A-E3-18 from Vishay General Semiconductor are direct substitutes with active product status and ROHS3 compliance. Both parts are electrically identical to the BAT54A_L99Z. The BAT54A-E3-08 offers higher inventory availability (35,400 units) compared to BAT54A-E3-18 (6,785 units). Both operate at a maximum junction temperature of 125°C, which is within the original specification range.

For Automotive Applications:

The BAT54AHE3-TP (Micro Commercial Co), BAT54AQ-13, and BAT54AQ-7-F (Diodes Incorporated) are qualified to AEC-Q101 automotive standards. These parts are suitable for applications requiring automotive-grade reliability. BAT54AQ-7-F provides the highest inventory level (6,300 units) among automotive-qualified options and extends the minimum operating temperature to -65°C.

For Lead-Free and Compliance-Critical Applications:

All substitute parts listed carry ROHS3 compliance or are explicitly marked as lead-free (CBAT54A TR PBFREE). The CBAT54A TR PBFREE from Central Semiconductor Corp is an alternative for applications requiring explicit lead-free designation.

Thermal Considerations:

The BAT54A-E3-08 and BAT54A-E3-18 operate at a maximum junction temperature of 125°C, which is 25°C lower than the original BAT54A_L99Z specification of 150°C. For applications operating near the upper thermal limit, BAT54AQ-13, BAT54AQ-7-F, or CBAT54A TR PBFREE are preferred, as they maintain the 150°C maximum junction temperature.

Frequently Asked Questions (FAQ)

Q: Can BAT54A-E3-08 or BAT54A-E3-18 be used as direct replacements for BAT54A_L99Z?

A: Yes. Both Vishay parts are electrically and mechanically equivalent. All critical parameters—diode configuration, reverse voltage, forward current, forward voltage, reverse recovery time, and reverse leakage current—are identical. Both are packaged in SOT-23-3 and are surface mount compatible. The primary difference is product status (active vs. obsolete) and thermal operating range (125°C max vs. 150°C max).

Q: What is the difference between BAT54AQ-13 and BAT54AQ-7-F?

A: Both are Diodes Incorporated parts with identical electrical specifications and AEC-Q101 automotive qualification. The primary difference is inventory availability: BAT54AQ-7-F has 6,300 units in stock compared to 791 units for BAT54AQ-13. Both support the full -65°C to 150°C operating temperature range.

Q: Are there thermal limitations when substituting with Vishay BAT54A-E3 series?

A: The Vishay BAT54A-E3-08 and BAT54A-E3-18 are rated to a maximum junction temperature of 125°C, compared to 150°C for the original BAT54A_L99Z. For applications operating above 125°C junction temperature, use BAT54AQ-13, BAT54AQ-7-F, or CBAT54A TR PBFREE, which maintain the 150°C maximum rating.

Q: Do all substitute parts meet RoHS compliance?

A: All substitute parts listed carry ROHS3 compliance or are explicitly marked as lead-free. The original BAT54A_L99Z does not specify RoHS status. If RoHS compliance is required, all listed substitutes are suitable.

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

A: AEC-Q101 is an automotive industry qualification standard. BAT54AHE3-TP, BAT54AQ-13, and BAT54AQ-7-F carry this qualification, indicating suitability for automotive applications. This qualification is not required for general industrial use but is mandatory for automotive-grade designs.

Q: Can I use CBAT54A TR PBFREE as a substitute?

A: Yes. The CBAT54A TR PBFREE from Central Semiconductor Corp is electrically and mechanically equivalent. It is explicitly marked as lead-free and ROHS3 compliant. The part operates across -65°C to 150°C, matching the extended thermal range of the original specification.

Q: Are there packaging differences between substitute parts?

A: All substitute parts use the SOT-23-3 or SOT-23 package, which are mechanically and electrically compatible. The primary packaging difference is format: the original BAT54A_L99Z is listed without packaging format specification, while substitutes are available in Tape & Reel (TR) format, which is standard for production quantities.

Q: Which substitute offers the best inventory availability?

A: BAT54A-E3-08 from Vishay offers the highest inventory level at 35,400 units in stock. This part is recommended for applications requiring immediate availability and high-volume production.