1N872 Alternative and Replacement Guide

YINT S1G is the primary modern rectifier candidate for redesigns based on the legacy 1N872 diode function. Because the old number varies across historical records, the guide also explains what evidence helps YINT confirm the application.

What the 1N872 is

The 1N872 is an obsolete rectifier number found in vintage equipment and component manuals. Search results are noisy because the same character string is also used as non-electronic stock codes. Identify the device from the circuit, markings and original service documentation before ordering a substitute.

The reference device is a legacy silicon rectifier using standard recovery silicon in legacy axial lead package dependent on manufacturer. A useful replacement comparison covers reverse voltage, forward current, surge capability, forward loss, leakage, recovery behavior, temperature and package at the relevant test conditions.

1N872 key specifications

The table summarizes the reference family and the YINT candidate. Confirm the complete manufacturer order code and current datasheet for the source in your BOM; YINT can help review the comparison for your application.

1N872 and YINT candidate comparison

The reference 1N872 is listed at 400 V PIV in period references and 100 mA in a 1959 Hughes reference in legacy axial lead package dependent on manufacturer. YINT S1G is listed at 400 V and 1.0 A in SMA DO-214AC. Use the table to compare the remaining surge, forward-voltage, leakage and temperature limits at the stated test conditions.

Choosing the right 1N872 replacement

Reverse voltage margin

Measure the maximum reverse voltage at the diode terminals under steady state, startup, shutdown, minimum load, maximum input and credible fault conditions. Use a probe connection that does not create its own ringing. Select a repetitive reverse rating above the measured peak with the margin required by the product standard and reliability target.

Forward current and thermal design

Average current alone does not establish thermal compatibility. Rectifier current is often pulsed, and package ratings assume a defined lead or case temperature. Calculate conduction loss from the current waveform, then verify junction temperature using the replacement package thermal path and the actual copper area.

Use the final YINT datasheet and the circuit's actual current to estimate loss, then confirm temperature rise on the redesigned board. YINT can help review the operating point.

Surge current and startup stress

Compare the surge waveform, pulse duration, initial junction temperature and repetition rate with the candidate data. A single half-sine IFSM number is not a repetitive-current rating. Capacitor charging, motor stall and hot-plug events may need separate transient analysis.

Switching behavior

Standard-recovery rectifiers are intended mainly for low-frequency use. If the circuit switches at tens of kilohertz or more, recovery current may dominate loss and EMI. Move to a fast or ultrafast family only after evaluating the resulting voltage and current waveforms.

Package options and design support

The proposed YINT package is SMA DO-214AC, while the reference part uses legacy axial lead package dependent on manufacturer. For a new PCB, review pad dimensions, polarity, creepage and thermal copper around the YINT package. For an existing layout, send the board drawing to YINT so the team can check the available package route.

For this legacy number, the equipment manual, circuit position and original device marking help YINT confirm the diode function and prepare a more precise recommendation.

1N872 replacement options from YINT

Recommended YINT alternative

S1G provides a 400 V, 1 A SMA route for a new board that reproduces the verified rectifier function of the historical 1N872. The original marking and circuit position help resolve legacy-number ambiguity.

Package options for your design

Specify at the inquiry stage whether the design can use SMA DO-214AC or must retain the legacy axial lead package dependent on manufacturer layout. This lets YINT identify the correct order code and prepare a relevant sample.

Why choose YINT for 1N872 replacement

YINT can support the 1N872 replacement project with a focused parameter comparison, the YINT S1G datasheet, package guidance and sample coordination. Share the original order code and application requirements to receive a recommendation based on the actual circuit instead of a generic part-number cross-reference.

YINT support for your 1N872 replacement project

1. Submit the complete 1N872 order code and a short description of the application.
2. YINT reviews the electrical class and shortlists the relevant S1G order code.
3. The customer and YINT confirm the package, polarity and mounting requirements.
4. YINT coordinates the datasheet, quotation and sample quantity for the selected candidate.
5. The customer evaluates the sample in the target circuit, with YINT available for technical questions.
6. Sales confirms the production quantity, target date and commercial terms for the approved order code.

Information for a fast YINT replacement recommendation

• Original manufacturer, complete 1N872 order code, datasheet or a clear part photo.
• Circuit function, schematic details, input and output conditions, and switching frequency.
• Required reverse voltage, forward current, surge waveform, recovery behavior, leakage and thermal limits.
• Existing package and footprint, polarity, solder process, and whether a PCB update is planned. The YINT S1G candidate uses SMA DO-214AC.
• Operating-temperature range, environmental or qualification standard, sample quantity and project timing.
• Equipment model, original circuit position and any historical service documentation for the legacy part.

FAQ

1. Which YINT part is recommended as a 1N872 alternative

Start with YINT S1G. Its headline class is 400 V and 1.0 A; the final order code depends on the package and operating conditions.

2. What is the reverse voltage of 1N872

The reference repetitive reverse-voltage rating is 400 V PIV in period references. The circuit waveform must remain below that rating with the required design margin.

3. What current can 1N872 carry

The published average forward-current rating is 100 mA in a 1959 Hughes reference, but the permitted current depends on the waveform, mounting condition and temperature.

4. Which package options are available for the replacement

The proposed YINT S1G uses SMA DO-214AC; the reference 1N872 uses legacy axial lead package dependent on manufacturer. Send a footprint drawing if package compatibility is a priority.

5. How can I request a confirmed YINT replacement recommendation

Send YINT the complete 1N872 order code, original datasheet or part photo, circuit conditions, package requirement and target quantity. The team can then recommend an exact order code and coordinate samples for customer evaluation.

6. Is 1N4004 a known 1N872 cross reference

Yes. Period cross-reference books map the legacy 1N872 to a 1N4004-class rectifier, but the old package and exact equipment requirements still need confirmation.

Selection summary

Use YINT S1G as the first cross-reference candidate for 1N872, then choose the package and exact order code from the circuit's voltage, current, surge, thermal and switching requirements.

To begin, send YINT the complete 1N872 order code, the required package, the main operating conditions, sample quantity and target date. The team can return a focused datasheet and sample response.