PR1504S-T Equivalent & Substitute Parts

Part Overview

The PR1504S-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 400 V DC reverse voltage and 1.5 A average rectified current in a DO-41 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The PR1504S-T features fast recovery characteristics with a reverse recovery time of 150 ns, suitable for standard rectification applications requiring moderate switching speeds.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 1.5 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	µA
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the PR1504S-T is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a maximum DC reverse voltage (Vr) of 400 V or higher to ensure equivalent or superior voltage withstand capability.

Current Rating: The PR1504S-T is rated for 1.5 A average rectified current. Substitutes are grouped into two categories: (1) direct current rating matches at 1.5 A, and (2) reduced current rating at 1.0 A for applications where lower current capacity is acceptable.

Recovery Speed: The PR1504S-T exhibits fast recovery characteristics (trr = 150 ns). Substitutes are classified as fast recovery (≤ 500 ns) or standard recovery (> 500 ns). Fast recovery substitutes maintain switching performance parity; standard recovery substitutes introduce longer switching delays.

Package Compatibility: The PR1504S-T uses DO-41 (DO-204AL) axial through-hole packaging. Substitutes are available in DO-41 (DO-204AL) or DO-15 (DO-204AC) packages. Package changes require PCB layout verification.

Product Status: The PR1504S-T is obsolete. Active substitute parts ensure long-term availability and supply chain continuity.

Compliance: All substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the original part.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Recovery Speed	trr	Package	Product Status
PR1504S-T	Diodes Incorporated	400 V	1.5 A	1.2 V @ 1.5 A	Fast Recovery ≤ 500ns	150 ns	DO-41	Obsolete
1N4936GHR1G	Taiwan Semiconductor Corporation	400 V	1 A	1.2 V @ 1 A	Fast Recovery ≤ 500ns	200 ns	DO-204AL (DO-41)	Active
1N5395-E3/73	Vishay General Semiconductor - Diodes Division	400 V	1.5 A	1.4 V @ 1.5 A	Standard Recovery > 500ns	2 µs	DO-204AL (DO-41)	Active
GP15G-E3/54	Vishay General Semiconductor - Diodes Division	400 V	1.5 A	1.1 V @ 1.5 A	Standard Recovery > 500ns	3.5 µs	DO-204AC (DO-15)	Active
RGP10G	Fairchild Semiconductor	400 V	1 A	1.3 V @ 1 A	Fast Recovery ≤ 500ns	150 ns	DO-41	Active
RGP15G-E3/54	Vishay General Semiconductor - Diodes Division	400 V	1.5 A	1.3 V @ 1.5 A	Fast Recovery ≤ 500ns	150 ns	DO-204AC (DO-15)	Active
UF4004 B0G	Taiwan Semiconductor Corporation	400 V	1 A	1 V @ 1 A	Fast Recovery ≤ 500ns	50 ns	DO-204AL (DO-41)	Active

Engineering Selection Recommendations

Direct Replacement (Matched Current and Recovery Speed):

RGP15G-E3/54 provides the closest functional equivalence to the PR1504S-T. It maintains 1.5 A current rating, 400 V voltage rating, and fast recovery characteristics (150 ns trr). The primary difference is package format: DO-15 (DO-204AC) versus DO-41 (DO-204AL). This substitution requires PCB layout modification to accommodate the different axial lead spacing. RGP15G-E3/54 is active and ROHS3 compliant.

Matched Current, Reduced Recovery Speed:

1N5395-E3/73 maintains the 1.5 A current rating and 400 V voltage rating but operates with standard recovery characteristics (2 µs trr). This part is suitable for applications where switching speed is not performance-critical. Forward voltage is slightly elevated at 1.4 V versus 1.2 V. The part uses DO-41 packaging, compatible with the original PCB layout. 1N5395-E3/73 is active and ROHS3 compliant.

Reduced Current, Matched Recovery Speed:

1N4936GHR1G and RGP10G both provide 1 A current rating with fast recovery characteristics (200 ns and 150 ns trr respectively). These parts are suitable for applications where circuit current requirements do not exceed 1 A. Both maintain 400 V voltage rating and ROHS3 compliance. 1N4936GHR1G includes AEC-Q101 automotive qualification. RGP10G uses DO-41 packaging; 1N4936GHR1G uses DO-204AL (DO-41) packaging.

Enhanced Recovery Performance:

UF4004 B0G offers the fastest recovery time (50 ns trr) among available substitutes, with 1 A current rating and 400 V voltage rating. This part is suitable for high-frequency switching applications where the PR1504S-T's 150 ns recovery time may be insufficient. Forward voltage is optimized at 1.0 V. UF4004 B0G uses DO-204AL (DO-41) packaging and is ROHS3 compliant.

Product Status Consideration:

All recommended substitutes are active products with established supply chains, ensuring procurement continuity beyond the PR1504S-T's obsolete status.

Frequently Asked Questions (FAQ)

Q: Can 1N5395-E3/73 directly replace PR1504S-T in all applications?

A: 1N5395-E3/73 provides electrical compatibility at the same 1.5 A and 400 V ratings. However, its standard recovery time (2 µs) is significantly longer than the PR1504S-T's fast recovery (150 ns). In high-frequency switching circuits, this difference may cause performance degradation. In low-frequency rectification applications, the substitution is valid. PCB layout remains compatible due to matching DO-41 packaging.

Q: What is the impact of switching from DO-41 to DO-15 packaging?

A: DO-15 (DO-204AC) and DO-41 (DO-204AL) are both axial through-hole packages but differ in lead spacing and body dimensions. GP15G-E3/54 and RGP15G-E3/54 use DO-15 packaging. Substitution requires PCB modification to accommodate different hole spacing. Electrical performance is unaffected by package format change.

Q: Is RGP10G suitable for applications requiring 1.5 A current?

A: No. RGP10G is rated for 1 A average rectified current. Using it in a 1.5 A application exceeds its current rating and will cause excessive heat generation and potential device failure. Current rating must match or exceed circuit requirements.

Q: How does forward voltage affect circuit performance?

A: Forward voltage (Vf) determines voltage drop across the diode during conduction. The PR1504S-T exhibits 1.2 V @ 1.5 A. Substitutes range from 1.0 V to 1.4 V. In power supply circuits, higher forward voltage increases power dissipation and reduces output voltage. In signal rectification, the difference is typically negligible. Circuit design must account for the specific Vf of the selected substitute.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All recommended substitutes maintain ROHS3 compliance, consistent with the PR1504S-T. This ensures compatibility with modern manufacturing and environmental regulations.

Q: What does reverse recovery time (trr) indicate?

A: Reverse recovery time is the interval required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Shorter trr (fast recovery) reduces switching losses and enables higher-frequency operation. The PR1504S-T's 150 ns trr supports switching frequencies up to several hundred kilohertz. Standard recovery diodes with trr > 500 ns are limited to lower frequencies.

Q: Can UF4004 B0G replace PR1504S-T in a 1.5 A circuit?

A: No. UF4004 B0G is rated for 1 A maximum current. Exceeding this rating will cause device failure. However, if circuit current is actually 1 A or less, UF4004 B0G provides superior recovery performance (50 ns) compared to the PR1504S-T (150 ns), enabling higher-frequency operation.

Q: What is the significance of AEC-Q101 qualification on 1N4936GHR1G?

A: AEC-Q101 is an automotive industry qualification standard. 1N4936GHR1G meets automotive reliability and performance requirements. This qualification is relevant only if the application requires automotive-grade components. For non-automotive applications, this qualification provides no additional benefit.

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