Renesas RD62F-T8

Overview

RD62F-T8 from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 62 V (B grade: 58–66 V), dynamic impedance of 50 Ω at 10 mA, and temperature coefficient of +47 mV/°C. It features a DO-41 glass-sealed DHD (Double Heatsink Diode) package and is rated for surge reverse power up to 400 W (t = 10 μs). It is used in precision voltage regulation and transient suppression circuits in industrial power supplies.

For engineers reviewing the RD62F-T8 datasheet, RD62F-T8 pinout, RD62F-T8 application, or RD62F-T8 equivalent, key selection criteria include its 62 V zener tolerance (±6.5%), low dynamic impedance under 10 mA bias, positive temperature coefficient for thermal stability in series configurations, and JEDEC DO-41 mechanical compatibility with standard through-hole PCB layouts.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown at a controlled, stable voltage when biased above its knee current (IZ ≥ 10 mA). Its planar junction structure ensures consistent breakdown characteristics and low leakage (<5 μA at VR = 47 V).

The RD62F-T8 exhibits a positive zener voltage temperature coefficient (+47 mV/°C), indicating increasing VZ with rising junction temperature - a trait typical of higher-voltage zeners (>5.6 V) and useful for compensating negative TC components in mixed-bias reference designs.

Key Specifications

Pinout & Package

RD62F-T8 uses a DO-41 axial-leaded glass package (JEDEC standard), with cathode identified by a black band. The device has two terminals: anode and cathode - no internal circuitry or additional pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RD62F-T8, 1N5388B offers higher power headroom but less common in legacy Japanese industrial designs, while BZX85C62 delivers tighter electrical consistency at the expense of minor TC deviation - both require validation of thermal layout and surge waveform compatibility.

Availability

RD62F-T8 is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) protection circuits, and DC bus monitoring systems requiring stable component supply and long-term obsolescence management.

Supply support for RD62F-T8 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 manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and timing solutions for industrial and automotive markets.

RD62F-T8 belongs to the RD2.0F–RD82F planar Zener diode product line, designed specifically for cost-effective, high-reliability voltage regulation and transient suppression in standard industrial equipment operating within the "Standard" quality grade.

FAQ

What is the exact zener voltage tolerance for RD62F-T8?

The RD62F-T8 is specified with a B-grade zener voltage range of 58 V minimum to 66 V maximum at IZ = 10 mA and TA = 25°C, representing a ±6.5% tolerance about the nominal 62 V value. This binning is confirmed in the official Renesas datasheet D13936EJ5V0DS, page 4, and applies to all RD62F-T8 units regardless of manufacturing lot.

Does RD62F-T8 have a cathode marking, and how is it oriented on the DO-41 package?

Yes, RD62F-T8 features a black cathode band located near one end of the DO-41 glass body, consistent with JEDEC DO-41 polarity convention. When viewed with leads pointing downward and the band on the left, the left lead is the cathode and the right lead is the anode - this orientation is verified in the package drawing on page 2 of Renesas datasheet D13936EJ5V0DS.

What is the maximum allowable surge reverse power for RD62F-T8, and under what conditions?

The RD62F-T8 supports a maximum surge reverse power (PRSM) of 400 W for a pulse width of 10 μs at TA = 25°C, as defined in the Absolute Maximum Ratings table (page 2) and illustrated in Figure 7 of the Renesas datasheet D13936EJ5V0DS. This rating assumes non-repetitive, single-event application and must be derated for repeated surges or elevated ambient temperatures.

How does the +47 mV/°C temperature coefficient of RD62F-T8 affect circuit performance?

The +47 mV/°C temperature coefficient means RD62F-T8's zener voltage increases by approximately 47 mV per degree Celsius rise in junction temperature. This behavior is leveraged in temperature-compensated reference designs - for example, pairing RD62F-T8 with a negative-TC component (e.g., forward-biased diode) to achieve near-zero net drift across −40°C to +85°C operating ranges.

Is RD62F-T8 compliant with RoHS and lead-free soldering requirements?

Yes, RD62F-T8 meets EU RoHS Directive requirements for restricted substances, as confirmed by Renesas Electronics' environmental compliance documentation. The device is compatible with lead-free reflow soldering profiles (peak temperature ≤260°C, 10-second dwell), and its glass DO-41 package contains no hazardous materials beyond RoHS thresholds - full details are available in Renesas' material declarations.