BAT54HT1 Equivalent & Substitute Parts

Part Overview

The BAT54HT1 is a Schottky detection and switching diode rated for 30 V DC reverse voltage with 200 mA average rectified current in a surface mount SOD-323 package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement. Active alternatives with identical or compatible electrical and mechanical specifications are available from multiple manufacturers.

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
Package / Case	SC-76, SOD-323
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution of the BAT54HT1 is determined by strict equivalence across the following critical parameters: maximum reverse voltage (30 V), average rectified current rating (200 mA), forward voltage drop characteristics, reverse recovery time (5 ns), reverse leakage current, and package form factor (SOD-323). Parts are grouped into two categories based on these criteria:

Direct Equivalents (Identical Electrical and Mechanical Specifications): Parts that match all key electrical parameters and operate within the same temperature range, differing only in product status (active vs. obsolete) and RoHS compliance.

Compatible Substitutes (Equivalent Electrical Performance with Parameter Variations): Parts that maintain the 30 V reverse voltage and SOD-323 package but may exhibit variations in forward voltage, reverse leakage, or capacitance within acceptable operating margins for detection and switching applications.

Parameter Comparison

Parameter	BAT54HT1	BAT54HT1G	BAS3010A03WE6327HTSA1	BAT54WS-E3-08	BAT54WS-TP
Manufacturer	onsemi	onsemi	Infineon Technologies	Vishay General Semiconductor - Diodes Division	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V	30 V	30 V
Current - Average Rectified (Io)	200 mA	200 mA	1 A	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	800 mV @ 100 mA	800 mV @ 100 mA	470 mV @ 1 A	800 mV @ 100 mA	1 V @ 100 mA
Reverse Recovery Time (trr)	5 ns	5 ns	Fast Recovery ≤ 500 ns	5 ns	5 ns
Current - Reverse Leakage @ Vr	2 µA @ 25 V	2 µA @ 25 V	200 µA @ 30 V	2 µA @ 25 V	2 µA @ 25 V
Capacitance @ Vr, F	10 pF @ 1 V, 1 MHz	10 pF @ 1 V, 1 MHz	35 pF @ 5 V, 1 MHz	10 pF @ 1 V, 1 MHz	10 pF @ 1 V, 1 MHz
Package / Case	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 125°C	125°C (Max)	125°C (Max)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BAT54HT1G (onsemi): This part is the direct equivalent replacement for the obsolete BAT54HT1. It maintains identical electrical specifications across all critical parameters including reverse voltage, current rating, forward voltage, reverse recovery time, reverse leakage, and capacitance. The BAT54HT1G is active in production status and ROHS3 compliant, making it the primary substitute for new designs and legacy system updates. Operating temperature range matches the original specification (-55°C ~ 150°C).

BAT54WS-E3-08 (Vishay General Semiconductor - Diodes Division): This part provides electrical equivalence with identical reverse voltage, current rating, forward voltage, reverse recovery time, reverse leakage, and capacitance specifications. It is ROHS3 compliant and active in production. The maximum operating temperature is specified at 125°C, which is lower than the original BAT54HT1 specification of 150°C. Selection of this part requires verification that the application does not require operation above 125°C junction temperature.

BAT54WS-TP (Micro Commercial Co): This part is electrically equivalent to the BAT54HT1 across reverse voltage, current rating, reverse recovery time, reverse leakage, and capacitance. Forward voltage is specified at 1 V @ 100 mA, which is higher than the original 800 mV specification. Maximum operating temperature is 125°C. This part is ROHS3 compliant and active in production. Selection requires confirmation that the higher forward voltage drop is acceptable for the application circuit.

BAS3010A03WE6327HTSA1 (Infineon Technologies): This part is a higher-current variant rated for 1 A average rectified current compared to the 200 mA rating of the BAT54HT1. While it maintains the 30 V reverse voltage rating and SOD-323 package, it exhibits higher reverse leakage current (200 µA @ 30 V versus 2 µA @ 25 V) and higher capacitance (35 pF @ 5 V versus 10 pF @ 1 V). The forward voltage is lower at 470 mV @ 1 A. This part is suitable for applications requiring higher current capacity but may introduce circuit performance changes due to increased leakage and capacitance. Operating temperature range is -65°C ~ 125°C.

Frequently Asked Questions (FAQ)

Q: Can BAT54HT1G be used as a direct replacement for BAT54HT1 without circuit modification?

A: Yes. The BAT54HT1G maintains identical electrical specifications for reverse voltage (30 V), average rectified current (200 mA), forward voltage (800 mV @ 100 mA), reverse recovery time (5 ns), reverse leakage current (2 µA @ 25 V), and capacitance (10 pF @ 1 V, 1 MHz). The SOD-323 package and operating temperature range (-55°C ~ 150°C) are also identical. No circuit modifications are required.

Q: What is the difference between BAT54WS-E3-08 and BAT54HT1?

A: The BAT54WS-E3-08 is electrically equivalent to the BAT54HT1 in all critical parameters. The primary difference is the maximum operating temperature specification: BAT54WS-E3-08 is rated to 125°C junction temperature, while BAT54HT1 is rated to 150°C. Applications operating at junction temperatures between 125°C and 150°C require the BAT54HT1 or BAT54HT1G.

Q: Why does BAS3010A03WE6327HTSA1 have higher reverse leakage current?

A: The BAS3010A03WE6327HTSA1 is rated for 1 A average rectified current, compared to 200 mA for the BAT54HT1. Higher current-rated Schottky diodes typically exhibit higher reverse leakage current as a characteristic of the semiconductor junction design. The 200 µA @ 30 V leakage specification for the BAS3010A03WE6327HTSA1 is acceptable for applications where the higher current capacity is required, but it may affect circuit performance in sensitive analog applications.

Q: Can BAT54WS-TP be used in place of BAT54HT1 if forward voltage is not critical?

A: The BAT54WS-TP can be used as a substitute if the application circuit tolerates the higher forward voltage specification of 1 V @ 100 mA compared to the BAT54HT1 specification of 800 mV @ 100 mA. The 200 mV difference in forward voltage drop may affect circuit performance in precision detection or switching applications. The maximum operating temperature of 125°C must also be verified as acceptable for the application.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (BAT54HT1G, BAT54WS-E3-08, BAT54WS-TP, and BAS3010A03WE6327HTSA1) are ROHS3 compliant. The original BAT54HT1 is RoHS non-compliant. Selection of any active substitute part satisfies RoHS compliance requirements for new designs.

Q: What is the significance of the SOD-323 package specification?

A: The SOD-323 package (also designated SC-76) is a surface mount form factor with standardized pin spacing and footprint. All listed substitute parts use the SOD-323 package, ensuring mechanical and electrical compatibility with existing PCB layouts designed for the BAT54HT1. No PCB redesign is required when substituting between these parts.

Q: Which substitute part should be selected for new designs?

A: The BAT54HT1G is the recommended selection for new designs. It is the direct equivalent of the obsolete BAT54HT1, maintains all electrical specifications including the full operating temperature range (-55°C ~ 150°C), and is ROHS3 compliant with active production status. Alternative parts may be selected if specific application requirements (such as higher current capacity or lower forward voltage) justify their use.

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