Renesas RD10E

Overview

RD10E from Excel Semiconductor is a DO-35 glass-sealed Zener diode with nominal zener voltage 10.0 V (min 9.82 V, max 10.39 V at 5 mA), dynamic impedance ≤20 Ω, knee impedance ≤120 Ω, and reverse current ≤0.2 μA at 7.0 V. It delivers stable voltage regulation in low-power reference and protection circuits.

For engineers reviewing the RD10E datasheet, RD10E pinout, RD10E application, or RD10E equivalent, key selection considerations include its 10 V zener tolerance (±3.9%), 400 mW power dissipation, 175 °C junction temperature rating, DO-35 package compatibility, and surge reverse power capability of 100 W.

Technical Context

The RD10E operates as a two-terminal voltage reference device using planar silicon junction technology. Its zener breakdown mechanism provides predictable reverse conduction onset at 10 V with low dynamic impedance (≤20 Ω) under 5 mA test current, enabling precise clamping in signal conditioning paths.

Designed for constant-voltage regulation and transient suppression, it maintains stable operation across -65 °C to +175 °C storage and junction temperature ranges. The DO-35 glass package ensures hermetic sealing and thermal stability suitable for industrial-grade reliability requirements.

Key Specifications

Pinout & Package

RD10E uses a standard DO-35 glass axial package with cathode identified by a band. Terminals are unmarked anode and banded cathode; no active circuitry or polarity-sensitive control logic is present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4740A and BZX55C10, RD10E offers tighter voltage tolerance and superior surge robustness in the compact DO-35 form factor-making it optimal for space-limited industrial controls requiring both precision and transient resilience.

Availability

RD10E is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and constant-current bias applications requiring stable component supply and long-term parametric consistency.

Supply support for RD10E 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

Excel Semiconductor is a China-based analog semiconductor manufacturer specializing in discrete power and protection devices with emphasis on industrial and automotive reliability.

The RD2.0E–RD39E series was designed specifically for high-stability, low-leakage zener regulation in mission-critical analog subsystems where thermal drift and long-term parameter shift must be minimized.

FAQ

What is the nominal zener voltage of RD10E and its tolerance range?

The RD10E has a nominal zener voltage of 10.0 V, with a guaranteed range of 9.82 V to 10.39 V at 5 mA test current. This ±3.9% tolerance reflects tighter specification than standard E24-series zeners and supports higher-accuracy analog designs where reference stability is critical. The RD10E achieves this via planar process control and DO-35 hermetic packaging.

Does RD10E support surge protection applications, and what is its maximum surge rating?

Yes, RD10E supports surge protection with a specified surge reverse power (P_RSM) of 100 W. This rating applies to single-pulse transients per JEDEC standards and enables use in input-stage clamping for power supplies and interface protection circuits. The RD10E maintains parameter integrity after such events due to its 175 °C junction rating and glass-sealed DO-35 construction.

What is the reverse leakage current specification for RD10E, and at what voltage is it measured?

The RD10E exhibits reverse current (I_R) ≤0.2 μA at V_R = 7.0 V, measured at T_j = 25 °C. This ultra-low leakage ensures minimal loading on high-impedance bias networks and preserves accuracy in precision reference applications. The RD10E's low I_R is enabled by its planar junction design and tight process control.

Is RD10E compatible with automated SMT assembly processes?

No, RD10E uses a DO-35 axial glass package intended for through-hole mounting only. It is not compatible with standard SMT reflow or wave soldering processes. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged zeners with comparable electrical specs-but note that RD10E's 100 W surge rating and DO-35 thermal mass are not replicated in those smaller packages.

How does RD10E's dynamic impedance compare to common alternatives, and why does it matter?

RD10E's dynamic impedance is ≤20 Ω at 5 mA, matching or improving upon many legacy zeners like 1N4740A (≤22 Ω). Low Z_zt minimizes output voltage variation under changing load current-critical in precision references and feedback loops. This performance is consistently delivered across the RD10E's operating temperature range, unlike some alternatives whose Z_zt degrades significantly above 85 °C.