BAT54S-D87Z Equivalent & Substitute Parts

Part Overview

The BAT54S-D87Z is a Schottky diode array manufactured by onsemi, configured as 1 pair series connection with 30 V reverse voltage rating and 200 mA average rectified current per diode. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement continuity. The part is housed in a SOT-23-3 (TO-236-3, SC-59) surface mount package with unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Series Connection	—
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
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAT54S-D87Z is determined by strict electrical and mechanical parameter matching within the Schottky diode rectifier category. The critical parameters governing substitution are:

Electrical Parameters:

Diode configuration (1 pair series connection)
Technology (Schottky)
Maximum reverse voltage (30 V minimum)
Average rectified current per diode (200 mA minimum)
Forward voltage drop (800 mV maximum @ 100 mA)
Reverse recovery time (5 ns maximum)
Reverse leakage current (2 µA maximum @ 25 V)

Mechanical Parameters:

Surface mount mounting type
SOT-23-3 package compatibility (TO-236-3, SC-59)
Moisture sensitivity level (MSL 1)

Substitute parts are classified into three categories:

Direct Substitutes: Parts meeting all electrical specifications and maintaining identical SOT-23-3 packaging. These include onsemi BAT54SLT1G and SBAT54SLT1G, which are active products with full parameter alignment.

Similar Substitutes: Parts with equivalent electrical performance but minor parameter variations or different package options. These include MMBD452LT1G (similar Schottky configuration), SBAS40-04LT1G (higher voltage rating, lower current), BAR43S-TP (lower reverse leakage), and BAT5404WH6327XTSA1 (SOT-323 package variant).

Upgrade Substitutes: Active products from alternative manufacturers (Infineon Technologies, Diodes Incorporated, Nexperia USA Inc.) meeting or exceeding the BAT54S-D87Z electrical specifications with enhanced product status and compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max) [V]	Io (per Diode) [mA]	Vf (Max) @ If [mV]	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Package	RoHS Status
BAT54S-D87Z	onsemi	Obsolete	30	200	800 @ 100	5	2 @ 25	150	SOT-23-3	—
BAT54SLT1G	onsemi	Active	30	200	800 @ 100	5	2 @ 25	125	SOT-23-3	ROHS3
SBAT54SLT1G	onsemi	Active	30	200	800 @ 100	5	2 @ 25	150	SOT-23-3	ROHS3
MMBD452LT1G	onsemi	Active	30	—	—	5	—	125	SOT-23-3	ROHS3
SBAS40-04LT1G	onsemi	Active	40	120	1000 @ 40	—	1 @ 25	150	SOT-23-3	ROHS3
BAT5404E6327HTSA1	Infineon Technologies	Active	30	200	800 @ 100	5	2 @ 25	150	SOT-23-3	ROHS3
BAT54S-7-F	Diodes Incorporated	Active	30	200	800 @ 100	5	2 @ 25	150	SOT-23-3	ROHS3
BAT54STA	Diodes Incorporated	Active	30	200	1000 @ 100	5	4 @ 25	125	SOT-23-3	ROHS3
BAR43S-TP	Micro Commercial Co	Active	30	200	800 @ 100	5	500 nA @ 25	150	SOT-23-3	—
BAT5404WH6327XTSA1	Infineon Technologies	Active	30	200	800 @ 100	5	2 @ 25	150	SOT-323	ROHS3
BAT54S,235	Nexperia USA Inc.	Active	30	200	800 @ 100	5	2 @ 25	150	SOT-23-3	ROHS3

Engineering Selection Recommendations

Primary Recommendation - Direct Substitutes:

SBAT54SLT1G (onsemi) and BAT54S-7-F (Diodes Incorporated) are the preferred direct substitutes for BAT54S-D87Z. Both parts maintain identical electrical specifications (30 V, 200 mA, 800 mV forward voltage, 5 ns recovery time, 2 µA reverse leakage) and SOT-23-3 packaging. SBAT54SLT1G includes automotive-grade qualification with operating temperature range of -55°C to 150°C, matching the original part's thermal specification. BAT54S-7-F extends the lower operating temperature to -65°C. Both are ROHS3 compliant and carry active product status with substantial inventory availability.

Secondary Recommendation - onsemi Active Alternatives:

BAT54SLT1G (onsemi) provides full electrical equivalence with ROHS3 compliance and active status. The maximum junction temperature is specified at 125°C, which is 25°C lower than the original part. This part is suitable for applications where the reduced thermal margin is acceptable.

Alternative Manufacturer Options:

BAT5404E6327HTSA1 (Infineon Technologies) delivers complete electrical equivalence with 30 V reverse voltage, 200 mA current, and 5 ns recovery time. The part maintains the -55°C to 150°C operating range and is ROHS3 compliant. BAT54S,235 (Nexperia USA Inc.) offers identical electrical performance with automotive-grade qualification (AEC-Q101) and active product status.

Conditional Substitutes:

SBAS40-04LT1G (onsemi) is suitable only for applications where the 40 V reverse voltage rating and 120 mA current rating are acceptable. This part has higher voltage capability but reduced current capacity and higher forward voltage drop (1 V @ 40 mA).

BAT54STA (Diodes Incorporated) is suitable where the 1 V forward voltage drop and 4 µA reverse leakage are acceptable. Maximum junction temperature is 125°C.

BAT5404WH6327XTSA1 (Infineon Technologies) is a package variant in SOT-323 (SC-70) format. This part maintains full electrical equivalence but requires PCB layout modification due to different pin spacing and footprint.

Not Recommended:

MMBD452LT1G lacks specified average rectified current rating and is classified as an RF diode, making it unsuitable for rectifier applications requiring the 200 mA specification.

BAR43S-TP has significantly lower reverse leakage current (500 nA vs. 2 µA), which may alter circuit behavior in applications sensitive to leakage characteristics.

Frequently Asked Questions (FAQ)

Q: Can BAT54SLT1G replace BAT54S-D87Z in all applications?

A: BAT54SLT1G is electrically equivalent with identical voltage, current, and recovery time specifications. The maximum junction temperature is 125°C compared to 150°C for the original part. Substitution is valid for applications where the thermal margin is sufficient. Verify that the circuit design does not require operation at junction temperatures above 125°C.

Q: What is the difference between BAT54SLT1G and SBAT54SLT1G?

A: Both parts are onsemi Schottky diode arrays with identical electrical specifications. SBAT54SLT1G includes automotive-grade qualification and maintains the full -55°C to 150°C operating temperature range of the original BAT54S-D87Z. BAT54SLT1G has a maximum junction temperature of 125°C. Select SBAT54SLT1G for automotive applications or where the full thermal range is required.

Q: Is BAT54S-7-F (Diodes Incorporated) a direct replacement?

A: Yes. BAT54S-7-F meets all electrical specifications of BAT54S-D87Z with identical 30 V reverse voltage, 200 mA current, 800 mV forward voltage, and 5 ns recovery time. The part extends the lower operating temperature to -65°C and is ROHS3 compliant. PCB footprint compatibility is maintained through identical SOT-23-3 packaging.

Q: Why is BAT5404WH6327XTSA1 listed as a similar substitute if the package is different?

A: BAT5404WH6327XTSA1 maintains complete electrical equivalence to BAT54S-D87Z but uses SOT-323 (SC-70) packaging instead of SOT-23-3. This part is listed for applications where package size reduction is beneficial and PCB layout can accommodate the smaller footprint. Pin-to-pin electrical function remains identical; however, PCB redesign is required.

Q: Can SBAS40-04LT1G be used as a substitute?

A: SBAS40-04LT1G is not a direct substitute. While it maintains the SOT-23-3 package and Schottky technology, it has a 40 V reverse voltage rating (vs. 30 V) and reduced current capacity of 120 mA (vs. 200 mA). Forward voltage is higher at 1 V @ 40 mA. This part is suitable only for applications where the higher voltage rating and lower current requirement are compatible with circuit design.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive 3 requirements, restricting the use of lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers. All active substitute parts listed are ROHS3 compliant, ensuring compatibility with modern manufacturing and environmental regulations.

Q: Is the BAT54S-D87Z truly obsolete?

A: Yes, BAT54S-D87Z is classified as obsolete by onsemi. Active equivalent parts are available from onsemi (BAT54SLT1G, SBAT54SLT1G) and alternative manufacturers (Infineon Technologies, Diodes Incorporated, Nexperia USA Inc.). Procurement of the original part number is not recommended for new designs or ongoing production.

Q: What is the significance of the 5 ns reverse recovery time?

A: Reverse recovery time (trr) of 5 ns indicates the speed at which the diode transitions from forward conduction to reverse blocking. This specification is critical for high-frequency switching applications. All listed substitute parts maintain the 5 ns specification, ensuring equivalent performance in switching circuits.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. SBAT54SLT1G has 410,200 units in stock, SBAS40-04LT1G has 74,100 units, and BAT54S-7-F has 185,300 units. BAT5404E6327HTSA1 (Infineon) has 2,000 units and BAT5404WH6327XTSA1 has 4,200 units. Verify current inventory status with suppliers before finalizing procurement decisions.

Q: Can BAT54STA be used if forward voltage drop is not critical?

A: BAT54STA is suitable for applications where the 1 V forward voltage drop (vs. 800 mV) and 4 µA reverse leakage (vs. 2 µA) are acceptable. The maximum junction temperature is 125°C. Verify that circuit design tolerates these parameter variations before substitution.

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