SR504-T Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR504-T is a 40V, 5A Schottky rectifier diode manufactured by Diodes Incorporated in DO-201AD axial through-hole packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The SR504-T operates across a junction temperature range of -65°C to 150°C and is RoHS3 compliant. Substitute parts must maintain electrical equivalence in reverse voltage rating, average rectified current, forward voltage characteristics, and fast recovery speed specifications while accommodating different packaging formats and manufacturer sources.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 5 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1	mA @ 40 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SR504-T is determined by strict equivalence in the following electrical parameters: 40V maximum reverse voltage rating, 5A average rectified current capacity, fast recovery speed characteristic (≤500ns for currents >200mA), and through-hole axial mounting configuration. Forward voltage drop at 5A rated current and reverse leakage current at rated voltage are secondary selection criteria that may vary within acceptable design margins. Substitute parts are grouped into two categories: direct electrical equivalents in DO-201AD packaging from alternative manufacturers, and functionally equivalent parts with different package styles (TOP HAT) that maintain the same electrical performance. All substitute parts listed are active products with current manufacturing status, ensuring long-term availability compared to the obsolete SR504-T.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ 5A	Reverse Leakage @ 40V	Package	Tj (Operating)	Product Status
SR504-T	Diodes Incorporated	40 V	5 A	550 mV	1 mA	DO-201AD	-65°C ~ 150°C	Obsolete
SB540-T	Diodes Incorporated	40 V	5 A	550 mV	500 µA	DO-201AD	-65°C ~ 125°C	Active
SB540-E3/54	Vishay General Semiconductor	40 V	5 A	480 mV	500 µA	DO-201AD	-65°C ~ 150°C	Active
SR504-AP	Micro Commercial Co	40 V	5 A	550 mV	1 mA	DO-201AD	-50°C ~ 150°C	Active
SR504-BP	Micro Commercial Co	40 V	5 A	550 mV	1 mA	DO-201AD	-50°C ~ 150°C	Active
SR504-TP	Micro Commercial Co	40 V	5 A	550 mV	1 mA	DO-201AD	-50°C ~ 150°C	Active
1N5825	Microchip Technology	40 V	5 A	380 mV	10 mA	TOP HAT	-65°C ~ 150°C	Active
SB540E-G	Comchip Technology	40 V	5 A	550 mV	500 µA	DO-201AD	-65°C ~ 125°C	Active
STPS5L40	STMicroelectronics	40 V	5 A	500 mV	200 µA	DO-201AD	-65°C ~ 150°C	Active
STPS5L40RL	STMicroelectronics	40 V	5 A	500 mV	200 µA	DO-201AD	-65°C ~ 150°C	Active

Engineering Selection Recommendations

All listed substitute parts maintain the core electrical specifications required for SR504-T replacement: 40V reverse voltage rating and 5A average rectified current capacity. Selection among active alternatives should prioritize parts with matching operating temperature ranges and package configurations to minimize design modifications.

DO-201AD Package Equivalents (Direct Pin-Compatible): SB540-T, SB540-E3/54, SR504-AP, SR504-BP, SR504-TP, SB540E-G, STPS5L40, and STPS5L40RL all provide direct mechanical and electrical compatibility in DO-201AD axial through-hole packaging. These parts are suitable for direct board-level substitution without layout changes.

Temperature Range Considerations: The SR504-T operates to 150°C junction temperature. SB540-T and SB540E-G are rated to 125°C maximum, which may be limiting in high-temperature applications. SB540-E3/54, STPS5L40, and STPS5L40RL maintain the full 150°C rating and are preferred for thermal margin-critical designs.

Forward Voltage Performance: STPS5L40 and STPS5L40RL offer the lowest forward voltage drop at 500 mV, followed by SB540-E3/54 at 480 mV. These parts reduce power dissipation in high-current applications. The 1N5825 provides the lowest forward voltage at 380 mV but uses TOP HAT packaging, requiring board layout modification.

Reverse Leakage Characteristics: SR504-AP, SR504-BP, and SR504-TP maintain the original 1 mA reverse leakage specification. STPS5L40 and STPS5L40RL offer superior leakage performance at 200 µA. SB540-T and SB540E-G provide intermediate leakage at 500 µA.

RoHS and Regulatory Compliance: All substitute parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SB540-T replace SR504-T directly on the PCB?

A: Yes. SB540-T is electrically and mechanically equivalent in DO-201AD packaging. The primary difference is a reduced maximum junction temperature rating (125°C versus 150°C for SR504-T). Verify that your application does not require operation above 125°C.

Q: What is the difference between SR504-AP, SR504-BP, and SR504-TP?

A: These three Micro Commercial Co parts are electrically identical, all maintaining the original SR504-T specifications including 550 mV forward voltage and 1 mA reverse leakage. The suffix designations (AP, BP, TP) indicate different packaging formats (Bulk). Selection among these three is based on procurement and inventory requirements rather than electrical performance.

Q: Why does 1N5825 have a different package designation (TOP HAT)?

A: The 1N5825 uses TOP HAT axial packaging instead of DO-201AD. While electrically equivalent in voltage and current ratings, the physical package dimensions differ. Board layout modification is required for 1N5825 substitution. This part offers superior forward voltage performance (380 mV) but higher reverse leakage (10 mA).

Q: Which substitute part has the best thermal performance?

A: STPS5L40 and STPS5L40RL offer the lowest forward voltage drop (500 mV) and lowest reverse leakage (200 µA), resulting in reduced power dissipation and improved thermal efficiency. Both maintain the full 150°C operating temperature range.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, meeting current environmental regulations.

Q: What is the minimum operating temperature for all substitute parts?

A: All substitute parts operate down to -50°C or lower. SR504-AP, SR504-BP, and SR504-TP are rated to -50°C minimum. All other parts are rated to -65°C minimum, matching or exceeding the original SR504-T specification.

Q: Can I use STPS5L40RL instead of STPS5L40?

A: Yes. STPS5L40RL and STPS5L40 are electrically identical with the same voltage, current, forward voltage, and reverse leakage specifications. The RL suffix indicates reel packaging format. Selection is based on procurement format preference.

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