onsemi 1N4748A_S00Z

Overview

1N4748A_S00Z from ON Semiconductor is a 22 V, 1 W Zener diode in DO-41 glass package, rated for ±5% tolerance, 11.5 Ω dynamic impedance at 19 mA test current, and operating from −65 °C to +200 °C. It regulates voltage in low-power reference and protection circuits, such as power supply feedback loops and overvoltage clamp stages.

For engineers reviewing the 1N4748A_S00Z datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal derating capability (6.67 mW/°C above 50 °C), peak reverse surge rating (205 mA), and DO-41 mechanical compatibility with through-hole PCB layouts.

Technical Context

This device operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and line conditions. Its 22 V nominal zener voltage is specified at 19 mA test current, with typical dynamic impedance of 11.5 Ω and maximum 12.5 Ω - critical for low-noise regulation in analog references.

The 1N4748A_S00Z features a non-repetitive peak reverse surge current rating of 205 mA (8.3 ms square wave), leakage current ≤5 µA at 16.7 V, and thermal resistance of 150 °C/W junction-to-lead - enabling reliable operation in industrial power supplies and automotive subsystems where transient immunity and thermal stability are required.

Key Specifications

Pinout & Package

DO-41 glass axial package with cathode indicated by a single black band. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Mechanical dimensions comply with JEDEC DO-41 standard: body diameter 2.0–2.7 mm, overall length 4.5–5.5 mm, lead diameter 0.4–0.6 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Compared with 1N4748A_S00Z, the base 1N4748A offers identical performance with less traceability overhead, while BZX55C22 trades power handling and thermal robustness for smaller size - making 1N4748A_S00Z optimal for industrial power regulation where reliability and margin are prioritized.

Availability

1N4748A_S00Z is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and sensor interface circuits requiring stable component supply with full lot traceability and extended temperature support.

Supply support for 1N4748A_S00Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The 1N47xxA series was designed as a general-purpose, high-reliability Zener diode family for voltage regulation and transient suppression in cost-sensitive, high-volume applications - emphasizing manufacturability, thermal robustness, and JEDEC-standard compatibility.

FAQ

What is the exact zener voltage tolerance for 1N4748A_S00Z?

The 1N4748A_S00Z has a guaranteed zener voltage tolerance of ±5% at 25 °C, meaning its breakdown voltage falls between 20.9 V and 23.1 V when tested at 19 mA. This tolerance remains valid across the full operating temperature range, and the S00Z suffix does not alter this specification - it reflects ON Semiconductor's internal traceability marking format, not a parametric revision.

Can 1N4748A_S00Z replace 1N4748A in existing designs?

Yes, 1N4748A_S00Z is functionally identical to 1N4748A in all electrical, thermal, and mechanical parameters. The "S00Z" suffix indicates a specific manufacturing lot with enhanced traceability (including date code XY and ON Semiconductor logo), but the DO-41 package, pinout, voltage, power rating, and impedance are unchanged - making it a direct drop-in replacement without layout or validation changes.

What is the maximum allowable ambient temperature for continuous 1W operation of 1N4748A_S00Z?

The 1N4748A_S00Z is rated for 1.0 W power dissipation only when lead temperature (T_L) is ≤50 °C. Since thermal derating begins at 50 °C at 6.67 mW/°C, continuous 1 W operation requires ambient temperature ≤50 °C with adequate lead heat sinking. At 75 °C ambient, maximum usable power drops to 833 mW - verified using the device's 150 °C/W junction-to-lead thermal resistance.

Does 1N4748A_S00Z meet automotive AEC-Q200 requirements?

No, the 1N4748A_S00Z is not AEC-Q200 qualified. While it operates from −65 °C to +200 °C and is widely used in automotive subsystems (e.g., body control modules), ON Semiconductor does not list it in their AEC-Q200 stress-tested product portfolio. For AEC-Q200-compliant alternatives, consider the NZ9F22V or MMBZ5246B families - both rated for automotive-grade temperature cycling and humidity testing.

How is the cathode identified on the 1N4748A_S00Z DO-41 package?

The cathode of the 1N4748A_S00Z is marked by a single black band located near one end of the DO-41 glass body. This band aligns with the cathode terminal - the end where the band appears is the cathode; the opposite end is the anode. The marking conforms to JEDEC standards and matches the polarity shown in the official ON Semiconductor 1N4728A–1N4758A datasheet Figure 1.