Renesas RD10F

Overview

RD10F from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed DHD package, with nominal zener voltage 10 V (B3 grade: 9.83–10.40 V), dynamic impedance ≤6 Ω at 40 mA, and reverse current ≤10 μA at 7.0 V. It serves as a precision voltage reference and overvoltage clamp in power supply regulation and signal conditioning circuits.

For engineers reviewing the RD10F datasheet, RD10F pinout, RD10F application, or RD10F equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC DO-41 terminal mapping, real-world use cases in surge protection and constant-voltage circuits, and two validated alternative parts with documented parameter differences.

Technical Context

The RD10F operates as a two-terminal voltage-regulating device relying on controlled reverse-biased avalanche breakdown. Its planar junction structure ensures stable zener voltage tolerance and low dynamic impedance across its rated test current range (40 mA for B3 grade).

Thermal performance is defined by a maximum junction temperature of 175°C and transient thermal impedance curves showing rapid heat dissipation under short pulses (e.g., 400 W surge at 10 μs). The device exhibits a positive zener voltage temperature coefficient of +6.5 mV/°C (typical), indicating voltage increases with rising ambient temperature.

Key Specifications

Pinout & Package

RD10F uses the JEDEC DO-41 axial glass package (3.0 mm diameter × 5.0 mm length) with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal circuitry or control pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RD10F, 1N4740A offers broader availability but sacrifices regulation accuracy and low-impedance performance, while BZX55C10 reduces footprint and cost at the expense of power handling and thermal robustness - making RD10F optimal for industrial-grade 10 V reference and clamping where precision and surge resilience are critical.

Availability

RD10F is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface protection, and analog signal conditioning requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for RD10F 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

Renesas Electronics Corporation is a global semiconductor leader formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.

The RD10F belongs to Renesas' legacy planar Zener diode family designed for general-purpose voltage regulation and transient suppression in standard industrial and consumer electronics applications.

FAQ

What is the exact zener voltage range for RD10F under standard test conditions?

The RD10F has a guaranteed zener voltage range of 9.83 V to 10.40 V when tested at I_Z = 40 mA for 40 ms after power-on, per its B3 grade specification in the official Renesas datasheet D13936EJ5V0DS. This 2.1% tolerance supports precise voltage referencing in feedback networks where tighter regulation than generic ±5% zeners is required. RD10F maintains this spec across its qualified operating temperature range.

Does RD10F support surge protection, and what is its peak pulse power rating?

Yes, RD10F is rated for surge reverse power (P_RSM) of 400 W at a pulse width of 10 μs, as confirmed in Figure 7 of the Renesas datasheet. This makes RD10F suitable for transient voltage suppression in low-to-medium energy events such as ESD or inductive switching spikes. Its planar DO-41 construction ensures reliable repetition performance within thermal limits defined by its 175°C junction rating.

What is the dynamic impedance of RD10F, and why does it matter in regulation circuits?

The dynamic impedance (Z_Z) of RD10F is ≤6 Ω at I_Z = 40 mA, per the Electrical Characteristics table. Low Z_Z means the RD10F exhibits minimal change in zener voltage under varying load or supply current - critical for maintaining stable reference voltages in regulator feedback paths or precision bias networks. Higher Z_Z would cause greater output drift during transients.

Is RD10F RoHS compliant, and what is its quality grade per Renesas classification?

RD10F meets RoHS Directive requirements as confirmed by Renesas' environmental compliance documentation. Per Renesas' three-tier quality grading, RD10F is classified as "Standard" grade - intended for computers, office equipment, communications gear, industrial robots, and similar non-safety-critical applications. It is not approved for automotive, medical life-support, or aerospace use without explicit written consent.

How does the temperature coefficient of RD10F affect its performance in wide-temperature environments?

RD10F has a typical zener voltage temperature coefficient (γ_Z) of +6.5 mV/°C, meaning its regulated voltage increases by ~6.5 mV per degree Celsius rise in junction temperature. In a 0–70°C ambient range, this results in ~0.46 V total drift - a key consideration in high-precision references. Designers mitigate this using compensation networks or selecting higher-V_Z parts with near-zero γ_Z, though RD10F's value remains suitable for moderate-accuracy applications.