BAT54A Schottky Diode Array Equivalent & Substitute Parts

Part Overview

The BAT54A is a Schottky diode array manufactured by Taiwan Semiconductor Corporation, configured as 1 pair common anode in a surface mount SOT-23 package. This component is classified as a small signal rectifier diode suitable for applications requiring low forward voltage drop and fast switching characteristics. The part maintains active production status with robust inventory availability (1,430,400 pieces in stock). Substitute parts are identified based on identical electrical specifications, mechanical compatibility, and package standardization to support supply chain flexibility and design continuity.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Anode	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io) (per Diode)	200	mA (DC)
Voltage - Forward (Vf) (Max) @ If	1	V @ 100 mA
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Reverse Recovery Time (trr)	5	ns
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BAT54A are classified based on strict parametric equivalence across the following critical criteria:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Anode (mandatory match)
Technology: Schottky (mandatory match)
Voltage - DC Reverse (Vr) (Max): 30 V (mandatory match)
Current - Average Rectified (Io) (per Diode): 200 mA (DC) (mandatory match)
Package / Case: TO-236-3, SC-59, SOT-23-3 (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Reverse Recovery Time (trr): 5 ns (mandatory match)

Secondary Tolerance Parameters:

Voltage - Forward (Vf) (Max) @ If: 1 V @ 100 mA (allowable range: 0.8 V to 1.0 V)
Current - Reverse Leakage @ Vr: 2 µA @ 25 V (allowable range: 2 µA to 4 µA)
Operating Temperature - Junction: -55°C to 125°C (allowable minimum: -55°C or higher; allowable maximum: 125°C)

Substitute parts meeting all primary criteria and falling within secondary tolerance ranges are classified as parametric equivalents. Parts with identical specifications across all parameters are classified as direct equivalents.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [mA]	Vf (Max) @ 100mA [V]	trr [ns]	Ir @ 25V [µA]	Tj (Max) [°C]	Package	Inventory [Pcs]
BAT54A	Taiwan Semiconductor Corporation	30	200	1.0	5	2	125	SOT-23-3	1,430,400
BAT54A RFG	Taiwan Semiconductor Corporation	30	200	1.0	5	2	125	SOT-23	46,457
BAT54A-G3-08	Vishay General Semiconductor - Diodes Division	30	200	0.8	5	2	125	SOT-23-3	8,787
BAT54A-G	Comchip Technology	30	200	1.0	5	2	125	SOT-23-3	94,181
BAT54A-TP	Micro Commercial Co	30	200	1.0	5	2	125	SOT-23	2,138
BAT54ATA	Diodes Incorporated	30	200	1.0	5	4	125	SOT-23-3	145,390

Engineering Selection Recommendations

All listed substitute parts maintain active production status and comply with ROHS3 and REACH requirements, matching the environmental and regulatory compliance profile of the primary BAT54A component.

Direct Parametric Equivalents (Identical Specifications):

BAT54A RFG (Taiwan Semiconductor Corporation): Identical electrical and thermal specifications. Packaging designation SOT-23 is equivalent to SOT-23-3. Suitable for direct substitution with no circuit performance impact.
BAT54A-G (Comchip Technology): Identical electrical and thermal specifications. Recommended for applications requiring alternative supplier qualification or supply chain diversification.
BAT54A-TP (Micro Commercial Co): Identical electrical and thermal specifications. Suitable for direct substitution. Lower inventory availability (2,138 pieces) may impact lead time.

Parametric Equivalents (Within Tolerance Range):

BAT54A-G3-08 (Vishay General Semiconductor - Diodes Division): Forward voltage specification of 0.8 V @ 100 mA is within the allowable tolerance range (0.8 V to 1.0 V). All other electrical parameters match specification. Suitable for substitution in applications where lower forward voltage drop provides circuit benefit.
BAT54ATA (Diodes Incorporated): Reverse leakage current specification of 4 µA @ 25 V is within the allowable tolerance range (2 µA to 4 µA). All other electrical parameters match specification. Suitable for substitution in applications with relaxed leakage current requirements.

Inventory Considerations:

BAT54A maintains highest inventory (1,430,400 pieces), supporting immediate availability.
BAT54A-G provides strong secondary inventory (94,181 pieces) with identical specifications.
BAT54ATA offers moderate inventory (145,390 pieces) with acceptable leakage tolerance.

Frequently Asked Questions (FAQ)

Q1: Can BAT54A-G3-08 be used as a direct replacement for BAT54A?

A: Yes. BAT54A-G3-08 meets all primary substitution criteria. The forward voltage specification of 0.8 V @ 100 mA is within the acceptable tolerance range (0.8 V to 1.0 V maximum). In applications where lower forward voltage drop is beneficial, BAT54A-G3-08 provides equivalent or superior performance. No circuit redesign is required.

Q2: What is the difference between BAT54A and BAT54A RFG?

A: Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications, thermal ratings, and compliance certifications. The designation "RFG" indicates a specific manufacturing lot or packaging variant. Both are suitable for direct substitution without performance impact.

Q3: Is BAT54ATA compatible with BAT54A in all applications?

A: Yes. BAT54ATA meets all primary substitution criteria. The reverse leakage current specification of 4 µA @ 25 V is within the acceptable tolerance range (2 µA to 4 µA maximum). Applications sensitive to leakage current should evaluate this parameter against circuit requirements, but the part is electrically compatible.

Q4: Why do some substitute parts specify different maximum junction temperatures?

A: All listed substitute parts specify a maximum junction temperature of 125°C, matching the primary BAT54A specification. Operating temperature range may vary by manufacturer (some specify -55°C to 125°C, others specify 125°C maximum only), but the maximum allowable junction temperature remains consistent across all parts.

Q5: Are all substitute parts available in the same packaging?

A: All substitute parts use the SOT-23 package family (SOT-23 or SOT-23-3 designations are equivalent). Physical dimensions and PCB footprint compatibility are identical. All parts are surface mount components suitable for automated assembly.

Q6: Which substitute part should be selected for supply chain continuity?

A: BAT54A-G (Comchip Technology) provides the best balance of inventory availability (94,181 pieces), identical electrical specifications, and active production status. BAT54A RFG (Taiwan Semiconductor Corporation) offers the highest inventory (46,457 pieces) from the original manufacturer. Selection depends on supplier qualification requirements and lead time constraints.

Q7: Do all substitute parts comply with environmental regulations?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory compliance profile of the primary BAT54A component.

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