BAT64 B5003 Equivalent & Substitute Parts

Part Overview

The BAT64 B5003 is a Schottky diode manufactured by Infineon Technologies, rated for 40 V DC reverse voltage and 120 mA average rectified current in a surface mount SOT-23-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The BAT64 B5003 serves applications requiring small-signal Schottky rectification with fast switching characteristics and low forward voltage drop. Substitute parts must maintain electrical compatibility across reverse voltage, forward current, and switching speed parameters while accommodating available package and manufacturer options.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	120	mA
Voltage - Forward (Vf) (Max) @ If	750 mV @ 100 mA	mV @ mA
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	2 µA @ 30 V	µA @ V
Capacitance @ Vr, F	6 pF @ 1V, 1MHz	pF @ V, MHz
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction (Max)	150	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitute parts for the BAT64 B5003 are grouped based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
Current - Average Rectified (Io): Must equal or exceed 120 mA
Package / Case: Must be TO-236-3, SC-59, or SOT-23-3 (physically compatible)
Technology: Schottky diode type
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Reverse Recovery Time (trr): Maintains small-signal switching performance
Forward Voltage (Vf): Lower values indicate improved efficiency; higher values remain acceptable if within application tolerance
Reverse Leakage Current: Lower values indicate better performance; higher values acceptable within application requirements
Operating Temperature Range: Must support junction temperatures up to 150°C minimum

Parts are classified into two categories:

Category 1: Parametric Equivalents (Exact Match) Parts with identical or near-identical electrical specifications to the BAT64 B5003, differing primarily in product status (active vs. obsolete) or packaging format.

Category 2: Functional Substitutes (Higher Current Rating) Parts with higher current ratings (200 mA, 300 mA, 500 mA, or 1 A) that maintain 40 V reverse voltage and SOT-23-3 package compatibility. These parts are suitable for applications where the original 120 mA specification can accommodate higher current capability without circuit modification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [mV @ mA]	trr [ns]	Ir @ Vr [µA @ V]	C @ Vr [pF @ V, MHz]	Package	Status
BAT64 B5003	Infineon Technologies	40	120	750 @ 100	5	2 @ 30	6 @ 1, 1MHz	SOT-23-3	Obsolete
BAT64E6327HTSA1	Infineon Technologies	40	120	750 @ 100	5	2 @ 30	6 @ 1, 1MHz	SOT-23-3	Active
BAS40,215	Nexperia USA Inc.	40	120	1000 @ 40	—	10 @ 40	5 @ 0, 1MHz	SOT-23-3	Active
BAS40,235	Nexperia USA Inc.	40	120	1000 @ 40	—	10 @ 40	5 @ 0, 1MHz	SOT-23-3	Active
BAT54FILM	STMicroelectronics	40	300	900 @ 100	5	1 @ 30	10 @ 1, 1MHz	SOT-23-3	Active
BAT720,215	Nexperia USA Inc.	40	500	550 @ 500	—	100 @ 35	90 @ 0, 1MHz	SOT-23-3	Active
BAT720,235	Nexperia USA Inc.	40	500	550 @ 500	—	100 @ 35	90 @ 0, 1MHz	SOT-23-3	Active
BAT721,215	Nexperia USA Inc.	40	200	550 @ 200	—	15 @ 30	50 @ 0, 1MHz	SOT-23-3	Active
PMEG4005ET,215	Nexperia USA Inc.	40	500	470 @ 500	—	100 @ 40	43 @ 1, 1MHz	SOT-23-3	Active
PMEG4010ET,215	Nexperia USA Inc.	40	1000	640 @ 1000	—	100 @ 40	50 @ 1, 1MHz	SOT-23-3	Active
RB420DT146	Rohm Semiconductor	40	100	450 @ 10	—	1 @ 10	6 @ 10, 1MHz	SOT-23-3	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

BAT64E6327HTSA1 (Infineon Technologies) is the direct parametric equivalent to BAT64 B5003. This part maintains identical electrical specifications (40 V, 120 mA, 750 mV forward voltage, 5 ns recovery time) and is classified as Active product status. BAT64E6327HTSA1 carries AEC-Q101 automotive qualification and ROHS3 compliance, providing enhanced reliability documentation compared to the obsolete BAT64 B5003.

Manufacturer-Recommended Alternatives:

BAS40,215 and BAS40,235 (Nexperia USA Inc.) are manufacturer-recommended substitutes with identical voltage and current ratings. Both parts are Active status with AEC-Q100 automotive qualification and ROHS3 compliance. Forward voltage specification differs (1000 mV @ 40 mA vs. 750 mV @ 100 mA on original), requiring circuit-level verification for applications with strict forward voltage requirements.

Higher Current Capability Substitutes:

BAT721,215 (200 mA), BAT54FILM (300 mA), BAT720,215 / BAT720,235 (500 mA), PMEG4005ET,215 (500 mA), and PMEG4010ET,215 (1 A) maintain 40 V reverse voltage and SOT-23-3 package compatibility while providing increased current handling. These parts are suitable for applications where circuit design permits higher current capability. PMEG4005ET,215 and PMEG4010ET,215 offer improved forward voltage characteristics (470 mV and 640 mV respectively at rated current).

Lower Current Alternative:

RB420DT146 (Rohm Semiconductor) provides 100 mA current rating, slightly below the original 120 mA specification. This part is suitable only for applications where 100 mA current capacity is sufficient. RB420DT146 demonstrates superior reverse leakage performance (1 µA @ 10 V) and lower forward voltage (450 mV @ 10 mA).

Compliance and Availability:

All recommended substitutes are Active product status with ROHS3 compliance and REACH unaffected designation. Inventory availability ranges from 4,200 to 131,460 pieces across manufacturers, ensuring procurement feasibility for production volumes.

Frequently Asked Questions (FAQ)

Q: Can BAT64E6327HTSA1 directly replace BAT64 B5003 without circuit modification?

A: Yes. BAT64E6327HTSA1 is a parametric equivalent with identical electrical specifications (40 V, 120 mA, 750 mV forward voltage, 5 ns recovery time) and compatible SOT-23-3 package. No circuit modification is required.

Q: What is the difference between BAS40,215 and BAS40,235?

A: Both parts are electrically identical (40 V, 120 mA, SOT-23-3 package, Active status, AEC-Q100 qualified). The difference is packaging format: BAS40,215 is supplied in Tape & Reel (TR), while BAS40,235 is also supplied in Tape & Reel (TR). Selection depends on procurement and assembly requirements.

Q: Can I use BAT720,215 (500 mA) in place of BAT64 B5003 (120 mA)?

A: Yes, from an electrical compatibility standpoint. BAT720,215 maintains 40 V reverse voltage and SOT-23-3 package compatibility. The higher current rating (500 mA vs. 120 mA) does not prevent substitution in circuits designed for 120 mA operation. However, forward voltage differs (550 mV @ 500 mA vs. 750 mV @ 100 mA), requiring verification for applications with strict voltage drop requirements.

Q: Why does RB420DT146 have lower current rating (100 mA) than BAT64 B5003 (120 mA)?

A: RB420DT146 is rated for 100 mA average rectified current, which is below the original 120 mA specification. This part is suitable only for applications where 100 mA current capacity is sufficient. For circuits requiring full 120 mA capability, use BAT64E6327HTSA1, BAS40,215, BAS40,235, or higher-rated alternatives.

Q: Are all substitute parts qualified for automotive applications?

A: Automotive qualification varies by part. BAT64E6327HTSA1 carries AEC-Q101 qualification. BAS40,215, BAS40,235, and BAT721,215 carry AEC-Q100 qualification. BAT54FILM, BAT720,215, BAT720,235, PMEG4005ET,215, and PMEG4010ET,215 do not list automotive qualification in provided specifications. RB420DT146 does not list automotive qualification. Verify qualification requirements for your specific application.

Q: What is the difference between small-signal and fast-recovery Schottky diodes in this list?

A: BAT64 B5003, BAS40,215, BAS40,235, BAT721,215, and RB420DT146 are classified as small-signal diodes (≤200 mA, any speed). BAT54FILM, BAT720,215, BAT720,235, PMEG4005ET,215, and PMEG4010ET,215 are classified as fast-recovery diodes (>200 mA, ≤500 ns recovery). Fast-recovery types are suitable for higher-current applications and switching power supplies.

Q: Can I mix different manufacturers' parts in the same circuit board?

A: Yes. All substitute parts maintain identical package (SOT-23-3), voltage rating (40 V), and mounting type (surface mount). Electrical parameters are compatible within specified tolerances. Mixing manufacturers is acceptable from a technical standpoint; however, verify forward voltage and leakage current specifications for your specific circuit requirements.

Q: What does "Moisture Sensitivity Level (MSL): 1 (Unlimited)" mean?

A: MSL 1 indicates unlimited shelf life without moisture-related degradation. All parts listed carry MSL 1 classification, meaning they can be stored without time-limited moisture precautions and do not require special handling or baking procedures prior to assembly.

Q: Why is BAT64 B5003 classified as obsolete?

A: Product obsolescence is determined by manufacturer discontinuation. BAT64E6327HTSA1 is the active equivalent from Infineon Technologies, providing identical specifications with current manufacturing support and availability.

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