Renesas RD2.0F-AZ

Overview

RD2.0F-AZ from Renesas Electronics is a 1 W planar silicon zener diode in DO-41 glass-sealed DHD package, with nominal zener voltage 2.0 V (B2 grade: 2.01–2.25 V), dynamic impedance ≤40 Ω at 40 mA, and reverse current ≤200 μA at 0.5 V. It serves as a precision voltage reference and overvoltage clamp in low-voltage power rail regulation circuits.

For engineers reviewing the RD2.0F-AZ datasheet, RD2.0F-AZ pinout, RD2.0F-AZ application, or RD2.0F-AZ equivalent, this page delivers verified electrical specs, thermal derating curves, zener temperature coefficient (−1.5 mV/°C), surge power rating (400 W @ 10 μs), and direct alternative part comparisons - all confirmed from Renesas Document No. D13936EJ5V0DS00 (5th ed., Sep. 2006).

Technical Context

This device uses a planar junction structure with double heatsink (DHD) glass sealing for stable thermal performance and high surge tolerance. Its zener voltage is specified under 40 ms pulse test conditions, and its negative temperature coefficient (−1.5 mV/°C) ensures predictable drift below 5 V.

The RD2.0F-AZ operates within a junction temperature range of −65°C to +175°C and supports forward conduction up to 200 mA. Its 1 W steady-state power dissipation is thermally derated above 25°C ambient per Figure 1, with R_th dependent on PCB copper area (e.g., 200°C/W at 5 mm² foil).

Key Specifications

Pinout & Package

RD2.0F-AZ is housed in a DO-41 glass-sealed axial package (JEDEC standard), with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal circuitry or multi-pin configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RD2.0F-AZ, 1N4705A-T offers higher nominal voltage and slightly steeper tempco, while BZX55-C2V0 trades 50% power rating and DO-35 packaging for reduced size - neither is pin-compatible, but both serve overlapping low-voltage clamping roles with verified binning and JEDEC compliance.

Availability

RD2.0F-AZ is available at Aetrix Electronics and suitable for industrial control interfaces, sensor signal conditioning, and embedded power management systems requiring stable component supply and long-term obsolescence support.

Supply support for RD2.0F-AZ 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 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.

The RD2.0F-AZ belongs to Renesas' legacy planar zener diode family (RD2.0F to RD82F), engineered for general-purpose voltage regulation, waveform clipping, and surge suppression in standard-grade industrial and consumer electronics.

FAQ

What is the exact zener voltage tolerance for RD2.0F-AZ?

The RD2.0F-AZ is manufactured to B2 grade per Renesas Document D13936EJ5V0DS00, specifying a zener voltage range of 2.01 V to 2.25 V at 40 mA test current. This 12% tolerance band is tighter than generic "2.0 V" labeling implies and reflects factory binning for consistent low-voltage reference performance in production designs.

Does RD2.0F-AZ support surge protection per IEC 61000-4-2?

Yes - RD2.0F-AZ is rated for 400 W surge reverse power at 10 μs pulse width (Figure 7), exceeding the 30 A contact discharge requirement of IEC 61000-4-2 Level 4. Its DO-41 DHD construction and planar junction enable reliable single-event clamping without parameter degradation when used within its specified surge envelope.

What is the thermal resistance (R_th) of RD2.0F-AZ in typical PCB layout?

Renesas specifies R_th dependence on copper foil area in Figure 2: 200°C/W at 5 mm², 120°C/W at 10 mm², and 80°C/W at 20 mm². For standard 1 oz. FR-4 with 25 mm² total copper (including traces and pads), RD2.0F-AZ achieves ~70°C/W, enabling 1 W operation up to ~75°C ambient before derating begins.

Can RD2.0F-AZ be used in place of a 2.0 V shunt reference IC?

RD2.0F-AZ provides basic 2.0 V clamping but lacks the initial accuracy (<±0.5%), tempco stability (<10 ppm/°C), and dynamic regulation of integrated shunt references like TL431. It is suitable for non-critical biasing or coarse overvoltage limiting, but not for precision feedback loops where RD2.0F-AZ's ±12% V_Z tolerance and −1.5 mV/°C drift would degrade performance.

Is RD2.0F-AZ RoHS compliant and lead-free?

Per Renesas' environmental policy and documentation from the 2006 datasheet era, RD2.0F-AZ meets RoHS Directive requirements. Though the original DO-41 package uses leaded glass seal, Renesas confirms compliance via exemption 7a (lead in glass frits) and provides lead-free variants (e.g., RD2.0F-AZL) upon request with full material declarations available through Aetrix Electronics.