Renesas RD3.3M-L-A

Overview

RD3.3M-L-A from Renesas Electronics is a 3.3 V, 200 mW planar zener diode in SC-59 (JEITA) 3-pin mini-mold package, rated for 5 mA test current with 130 Ω dynamic impedance and ≤20 μA reverse leakage at 1.0 V, used for precision voltage reference and low-power surge suppression in consumer power rails.

For engineers reviewing the RD3.3M-L-A datasheet, RD3.3M-L-A pinout, RD3.3M-L-A application, or RD3.3M-L-A equivalent, this component serves as a stable, E24-standardized zener reference in compact 3-pin surface-mount designs requiring tight V_Z tolerance (3.25–3.50 V), low thermal drift, and reliable transient absorption up to 100 W (10 μs pulse).

Technical Context

This device operates as a two-terminal voltage-reference element using planar junction technology, with zener breakdown mechanism dominant in its 3.3 V regulation range. Its electrical behavior is defined under pulsed test conditions (40 ms), and temperature coefficient is specified across the full V_Z range.

The RD3.3M-L-A exhibits a typical zener impedance of 130 Ω at 5 mA, reverse leakage capped at 20 μA when biased at 1.0 V, and maximum junction temperature of 150°C - all consistent with standard-grade reliability for non-safety-critical industrial and consumer applications.

Key Specifications

Pinout & Package

RD3.3M-L-A uses the SC-59 (JEITA) 3-pin mini-mold package: 2.9 mm × 2.8 mm × 1.1–1.4 mm height, with gull-wing leads and top marking "A" for anode identification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MM3Z3V3T1G and BZX384-B3V3, RD3.3M-L-A offers the lowest Z_Z among 200 mW 3.3 V zeners in SC-59, making it optimal for precision reference use where regulation stability matters more than ultra-low leakage or smallest footprint.

Availability

RD3.3M-L-A is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset circuits, audio signal limiting, and low-power sensor biasing requiring stable component supply and long-term obsolescence management.

Supply support for RD3.3M-L-A 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices, formed in 2010 via merger of NEC Electronics and Renesas Technology.

RD3.3M-L-A belongs to the RD2.0M–RD47M zener diode family, designed for general-purpose voltage regulation and transient suppression in cost-sensitive consumer and industrial electronics.

FAQ

What is the exact zener voltage range for RD3.3M-L-A at 5 mA test current?

The RD3.3M-L-A has a guaranteed zener voltage range of 3.25 V to 3.50 V when measured at I_Z = 5 mA and T_A = 25°C, per the B2 class specification in the official Renesas datasheet D14716EJ7V0DS. This 250 mV window reflects E24-series compliance and supports robust 3.3 V rail referencing across manufacturing variance.

Does RD3.3M-L-A have a functional pin 1, and what happens if it's connected?

No - pin 1 of RD3.3M-L-A is a No Connect (NC) terminal with no internal connection. If inadvertently soldered to a net, it introduces no electrical effect but risks mechanical stress or contamination. The device functions identically whether pin 1 is left floating or covered with soldermask; Renesas explicitly defines it as NC in the package diagram and marking guide.

Can RD3.3M-L-A be used in place of a 3.3 V TVS diode for ESD protection?

RD3.3M-L-A is not rated or characterized for IEC 61000-4-2 ESD events and lacks specified clamping voltage or response time data. While it can absorb 100 W surges (10 μs), its 130 Ω dynamic impedance and lack of fast-turn-on behavior make it unsuitable as a primary ESD protector. Use dedicated TVS devices like PESD3V3L1BA for compliant ESD protection; RD3.3M-L-A remains appropriate for slower overvoltage clamping.

What is the thermal resistance and derating behavior of RD3.3M-L-A above 25°C?

RD3.3M-L-A has a transient thermal impedance of 625°C/W (t = 1 ms), and its steady-state power dissipation derates linearly from 200 mW at 25°C to 0 mW at 150°C ambient. The derating slope is −1.67 mW/°C, meaning at 75°C ambient, maximum allowable DC power drops to 117 mW - a critical constraint for enclosed or high-temperature deployments.

Is RD3.3M-L-A compliant with RoHS and lead-free assembly requirements?

Yes - RD3.3M-L-A meets EU RoHS Directive requirements, as confirmed by Renesas Electronics' environmental compliance documentation. It supports lead-free reflow soldering profiles (peak temperature ≤260°C) and contains no restricted substances above threshold limits. Full material declarations and test reports are available through Renesas' official product environmental page.