Renesas RD8.2E-T4

Overview

RD8.2E-T4 from NEC Corporation is a 8.2 V, 500 mW Zener diode in SC-76 (SSP) surface-mount package, with ±5% tolerance and 5 µA maximum reverse leakage at rated voltage, used for precision voltage reference and overvoltage protection in low-power analog circuits.

For engineers reviewing the RD8.2E-T4 datasheet, RD8.2E-T4 pinout, RD8.2E-T4 application, or RD8.2E-T4 equivalent, key selection factors include Zener voltage accuracy, power dissipation limit, reverse leakage at test current, thermal resistance, and taping configuration for automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. It is characterized at I_Z = 5 mA and specified for operation up to +150°C junction temperature.

The SC-76 (SSP) package provides a compact 1.6 mm × 0.8 mm footprint with single-terminal anode/cathode polarity marking, optimized for high-density PCB layouts and reflow-compatible assembly.

Key Specifications

Pinout & Package

SC-76 (SSP) is a two-terminal surface-mount package with cathode identified by a band on the device body. No internal leads or multiple pins - anode and cathode are accessed via opposing end pads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C8V2 and MMSZ5236B, RD8.2E-T4 offers identical voltage tolerance and power rating as MMSZ5236B but with half the reverse leakage, while occupying 45% less board area than either alternative-critical for space-constrained sensor nodes.

Availability

RD8.2E-T4 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, RTC backup regulation, and PLC input clamping requiring stable component supply and consistent taping configuration (-T4).

Supply support for RD8.2E-T4 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

NEC Corporation was a Japanese semiconductor pioneer known for discrete devices, memory, and communications ICs before merging into Renesas Electronics in 2010.

The RD-series Zener diodes were designed for high-reliability industrial and instrumentation applications where tight voltage tolerance and repeatable taping were essential for automated manufacturing.

FAQ

What is the Zener voltage tolerance of RD8.2E-T4?

The RD8.2E-T4 has a Zener voltage tolerance of ±5% at 5 mA test current, meaning its actual breakdown voltage falls between 7.79 V and 8.61 V under standard test conditions. This tolerance is tighter than general-purpose Zeners and supports precision voltage reference designs where repeatability matters. The RD8.2E-T4 maintains this specification across its full operating temperature range.

Does RD8.2E-T4 support automated SMT assembly?

Yes, RD8.2E-T4 is supplied in SC-76 (SSP) tape-and-reel format with -T4 taping configuration, compatible with standard 8 mm carrier tape feeders and vision-guided pick-and-place systems. Its 1.6 mm × 0.8 mm footprint and cathode band marking ensure reliable orientation detection and placement accuracy. The RD8.2E-T4 reel contains 3000 units per standard reel.

What is the maximum reverse leakage current for RD8.2E-T4?

The RD8.2E-T4 specifies a maximum reverse leakage current of 5 µA at 6.56 V (80% of nominal V_Z). This low leakage enables use in high-impedance circuits such as battery-backed RTC references or precision divider networks where parasitic current must be minimized. The RD8.2E-T4 achieves this performance without sacrificing power rating or voltage accuracy.

Can RD8.2E-T4 replace older DO-35 Zener diodes in existing designs?

RD8.2E-T4 can replace DO-35-packaged 8.2 V Zeners only with PCB layout revision due to its SC-76 (SSP) footprint (1.6 mm × 0.8 mm vs. DO-35's 4.5 mm length). While electrical parameters align closely, the smaller size requires pad redesign and reflow profile validation. The RD8.2E-T4 offers improved thermal resistance and density but is not a drop-in mechanical replacement.

What is the junction-to-ambient thermal resistance (R_θJA) of RD8.2E-T4?

The RD8.2E-T4 has a typical junction-to-ambient thermal resistance of 500°C/W when mounted on a standard FR-4 PCB with minimal copper area. This value increases significantly with reduced copper pour or no thermal relief, limiting continuous power dissipation in compact layouts. Derating curves in the original NEC datasheet define safe operating area versus ambient temperature for the RD8.2E-T4.