BAT54S-7 Equivalent & Substitute Parts

Part Overview

The BAT54S-7 is a Schottky diode array in a 1 Pair Series Connection configuration manufactured by Diodes Incorporated. This component is rated for 30 V DC reverse voltage with 200 mA average rectified current per diode and features a maximum forward voltage of 800 mV at 100 mA. The part is housed in a SOT-23-3 surface mount package suitable for high-speed switching applications requiring low forward voltage drop characteristics.

The BAT54S-7 is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility with existing designs. Substitute parts must satisfy the core electrical parameters: 30 V reverse voltage rating, 200 mA current capability, Schottky technology, and compatible surface mount packaging.

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 (DC)
Voltage - Forward (Vf) (Max) @ If	800	mV @ 100 mA
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	2	µA @ 25 V
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAT54S-7 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Series Connection (mandatory)
Technology: Schottky (mandatory)
Voltage - DC Reverse (Vr) (Max): 30 V minimum (equal or higher acceptable)
Current - Average Rectified (Io) (per Diode): 200 mA minimum (equal or higher acceptable)
Reverse Recovery Time (trr): 5 ns (equal or faster acceptable)
Current - Reverse Leakage @ Vr: 2 µA @ 25 V (equal or lower acceptable)

Secondary Compatibility Criteria:

Mounting Type: Surface Mount (mandatory)
Package / Case: SOT-23-3, SOT-323, or SOT-523 (pin-compatible or footprint-compatible alternatives)
Moisture Sensitivity Level (MSL): 1 (Unlimited) preferred
RoHS Compliance: ROHS3 Compliant preferred for new designs

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical specifications with same or compatible packaging) and Manufacturer Recommended Alternatives (equivalent electrical performance with potential package variations or enhanced specifications).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [mA]	Vf (Max) @ If [mV]	trr [ns]	Ir @ Vr [µA]	Package / Case	Product Status	RoHS Status
BAT54S-7	Diodes Incorporated	30	200	800 @ 100 mA	5	2 @ 25 V	TO-236-3, SC-59, SOT-23-3	Discontinued	RoHS non-compliant
BAT54S-7-F	Diodes Incorporated	30	200	800 @ 100 mA	5	2 @ 25 V	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BAT5404WH6327XTSA1	Infineon Technologies	30	200	800 @ 100 mA	5	2 @ 25 V	SC-70, SOT-323	Active	ROHS3 Compliant
BAT54S-G3-08	Vishay General Semiconductor - Diodes Division	30	—	800 @ 100 mA	5	2 @ 25 V	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BAT54S-HE3-08	Vishay General Semiconductor - Diodes Division	30	—	800 @ 100 mA	5	2 @ 25 V	TO-236-3, SC-59, SOT-23-3	Last Time Buy	ROHS3 Compliant
BAT54S-TP	Micro Commercial Co	30	200	1000 @ 100 mA	5	2 @ 25 V	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BAT54SFILM	STMicroelectronics	40	300	900 @ 100 mA	5	1 @ 30 V	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant
BAT54ST-TP	Micro Commercial Co	30	200	1000 @ 100 mA	5	2 @ 25 V	SOT-523	Active	ROHS3 Compliant
BAT54SW,115	Nexperia USA Inc.	30	200	800 @ 100 mA	5	2 @ 25 V	SC-70, SOT-323	Active	ROHS3 Compliant
BAT754S,215	NXP USA Inc.	30	200	600 @ 100 mA	—	2 @ 25 V	TO-236-3, SC-59, SOT-23-3	Active	—
CDBT-54S-HF	Comchip Technology	30	200	1000 @ 100 mA	5	2 @ 25 V	TO-236-3, SC-59, SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalent (Recommended Primary Substitute):

BAT54S-7-F from Diodes Incorporated is the direct parametric equivalent to the discontinued BAT54S-7. This part maintains identical electrical specifications (30 V reverse voltage, 200 mA current, 800 mV forward voltage at 100 mA, 5 ns reverse recovery time) and identical packaging (SOT-23-3). The BAT54S-7-F is currently in active production status with ROHS3 compliance, making it the preferred replacement for new procurement and design updates.

Package-Compatible Alternatives (SOT-23-3 Footprint):

BAT54S-TP (Micro Commercial Co), CDBT-54S-HF (Comchip Technology), and BAT54S-G3-08 (Vishay) are all housed in SOT-23-3 packages with 30 V reverse voltage and 200 mA current ratings. These parts are suitable for direct footprint replacement. BAT54S-TP and CDBT-54S-HF exhibit slightly higher forward voltage (1000 mV at 100 mA) compared to the original specification (800 mV), which may impact circuit performance in applications with tight voltage margin requirements. BAT54S-G3-08 maintains the 800 mV forward voltage specification and is in active production status.

Smaller Package Alternatives (SOT-323 Footprint):

BAT5404WH6327XTSA1 (Infineon Technologies) and BAT54SW,115 (Nexperia USA Inc.) are housed in the more compact SC-70/SOT-323 package while maintaining identical electrical specifications (30 V, 200 mA, 800 mV forward voltage, 5 ns recovery time). These parts require PCB layout modification to accommodate the smaller footprint but offer space savings in compact designs. Both are in active production with ROHS3 compliance. BAT54SW,115 includes AEC-Q101 automotive qualification.

Enhanced Specification Alternative:

BAT54SFILM (STMicroelectronics) provides enhanced electrical specifications with 40 V reverse voltage rating and 300 mA current capability, exceeding the original BAT54S-7 requirements. This part is suitable for applications requiring higher voltage or current margins. The forward voltage is specified at 900 mV at 100 mA, representing a 100 mV increase over the original specification.

Automotive-Qualified Options:

BAT54S-HE3-08 (Vishay) and BAT54SW,115 (Nexperia) both carry AEC-Q101 automotive qualification. BAT54S-HE3-08 is in Last Time Buy status, indicating limited future availability. BAT54SW,115 is in active production and recommended for automotive applications requiring qualified components.

Lower Forward Voltage Option:

BAT754S,215 (NXP USA Inc.) offers a reduced forward voltage specification of 600 mV at 100 mA, providing improved efficiency in low-voltage switching applications. This part maintains 30 V reverse voltage and 200 mA current ratings with SOT-23-3 packaging.

Frequently Asked Questions (FAQ)

Q: Can BAT54S-7-F be used as a direct replacement for BAT54S-7?

A: Yes. BAT54S-7-F is the direct parametric equivalent with identical electrical specifications and packaging. The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 versus non-compliant). No circuit modifications are required.

Q: What is the difference between SOT-23-3 and SOT-323 packages?

A: SOT-23-3 (also designated TO-236-3 or SC-59) and SOT-323 (also designated SC-70) are both three-pin surface mount packages but differ in physical dimensions. SOT-323 is smaller and more compact. Parts in SOT-323 packages require PCB layout modifications and cannot be used in existing SOT-23-3 footprints without redesign.

Q: Why does BAT54S-TP have a higher forward voltage (1000 mV) than the original BAT54S-7 (800 mV)?

A: Forward voltage variation is a characteristic difference between manufacturers and process technologies. While BAT54S-TP meets the 30 V and 200 mA specifications, the higher forward voltage may result in increased power dissipation and heat generation in the application. Verify that the circuit design accommodates this voltage difference before substitution.

Q: Is BAT54SFILM a suitable substitute despite its higher voltage and current ratings?

A: BAT54SFILM is electrically compatible as a substitute because it exceeds the minimum requirements (40 V versus 30 V required, 300 mA versus 200 mA required). The higher ratings provide additional design margin. However, the forward voltage specification (900 mV at 100 mA) is 100 mV higher than the original, which may affect circuit performance in applications with tight voltage budgets.

Q: Which substitute part is recommended for automotive applications?

A: BAT54SW,115 (Nexperia USA Inc.) is recommended for automotive applications. This part carries AEC-Q101 qualification, is in active production status, maintains identical electrical specifications to the original BAT54S-7, and is available in high volume (1,000,400 pieces in stock).

Q: Can I use BAT54ST-TP in place of BAT54S-7?

A: BAT54ST-TP is electrically compatible (30 V, 200 mA, 5 ns recovery time) but uses the SOT-523 package instead of SOT-23-3. This requires PCB layout modification and cannot be used in existing SOT-23-3 footprints. The forward voltage specification is 1000 mV at 100 mA, higher than the original 800 mV.

Q: What does RoHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials. For new designs and procurement, ROHS3-compliant parts are preferred. The original BAT54S-7 is RoHS non-compliant, making ROHS3-compliant substitutes (such as BAT54S-7-F) necessary for applications subject to RoHS regulations.

Q: Are there any inventory considerations when selecting a substitute?

A: Yes. BAT54SW,115 has the highest inventory availability (1,000,400 pieces), followed by BAT54SFILM (91,070 pieces) and BAT54S-7-F (185,300 pieces). For applications requiring immediate procurement, parts with higher inventory levels reduce lead time risk. CDBT-54S-HF has the lowest inventory (716 pieces), which may present supply constraints.

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

A: Reverse recovery time (trr) indicates how quickly the diode transitions from conducting to blocking state. All listed substitute parts maintain the 5 ns specification, ensuring equivalent switching speed performance. This parameter is critical in high-frequency switching applications where slower recovery times would cause increased switching losses.

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