Taiwan Semiconductor Corporation 2M20Z

Overview

2M20Z from Taiwan Semiconductor is a 2 W, 20 V Zener diode in DO-204AC (DO-15) package, featuring 11 Ω maximum zener impedance at 25 mA test current, ≤0.5 µA leakage at 15.2 V, and AEC-Q101 qualification option. It serves as a precision voltage reference and overvoltage clamp in automotive power rails and industrial sensor signal conditioning circuits.

For engineers reviewing the 2M20Z datasheet, 2M20Z pinout, 2M20Z application, or 2M20Z equivalent, key selection criteria include its 20 V nominal zener voltage with ±5% tolerance, 90 mA maximum zener current, 175 °C maximum junction temperature, and glass-passivated junction for stable regulation under thermal stress.

Technical Context

The 2M20Z operates as a single-die, unidirectional silicon Zener diode optimized for stable reverse-bias voltage regulation. Its 20 V breakdown is specified at 25 mA (IZT), with low dynamic impedance (11 Ω) ensuring minimal voltage deviation under load transients.

Designed for high-reliability environments, it supports operation from –55 °C to +175 °C, features pure tin-plated leads compliant with J-STD-002, and meets JESD201 Class 2 whisker resistance. The DO-204AC package enables standard through-hole mounting on 10 mm × 10 mm Cu pads.

Key Specifications

Pinout & Package

DO-204AC (DO-15) package: axial-leaded, glass-passivated, epoxy-molded case with cathode band indicating terminal polarity. Weight ≈ 0.400 g. Lead finish: pure tin, solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4740A and BZX55C20, the 2M20Z delivers 2× the power rating, AEC-Q101 qualification, and lower dynamic impedance-making it the preferred choice for automotive and industrial systems requiring sustained 20 V regulation under thermal and electrical stress.

Availability

2M20Z is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input conditioning, and telecom line interface surge suppression requiring stable component supply across multi-year production cycles.

Supply support for 2M20Z 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, rectifiers, and protection components with global distribution and AEC-Q101 validation capability.

The 2MxxZ series was developed specifically for high-stability, high-reliability Zener regulation in automotive and industrial environments-emphasizing thermal robustness, low leakage, and consistent breakdown voltage across temperature extremes.

FAQ

What is the zener voltage tolerance for 2M20Z?

The 2M20Z has a standard zener voltage tolerance of ±5% at 25 °C, meaning its actual breakdown voltage falls between 19.0 V and 21.0 V when measured at I_ZT = 25 mA. Tighter tolerances are available as special-order variants but are not part of the standard 2M20Z offering per Taiwan Semiconductor's N2105 datasheet revision.

Is 2M20Z AEC-Q101 qualified?

The base 2M20Z part is not automatically AEC-Q101 qualified; qualification requires the "H" suffix (e.g., 2M20ZH). Per the ordering information in the datasheet, only variants marked with "H" undergo full AEC-Q101 stress testing-including temperature cycling, HTRB, and ESD. Standard 2M20Z is suitable for industrial use but must be ordered as 2M20ZH for automotive applications.

What is the maximum surge current rating for 2M20Z?

The 2M20Z supports a non-repetitive peak forward surge current (I_FSM) of 15 A for an 8.3 ms single half-sine wave, as defined by JEDEC standards. This rating applies when mounted on a 10 mm × 10 mm copper pad at T_L = 75 °C. For repetitive surges, derating per the thermal response curves (Fig.9) is required to avoid junction overheating.

Can 2M20Z be used in surface-mount designs?

No, the 2M20Z is exclusively offered in the through-hole DO-204AC (DO-15) package with axial leads. It does not have an SMD variant. For surface-mount Zener alternatives with comparable 20 V rating and 2 W capability, consider TSC's SMAZ20 or equivalent SOD-123 packages-but those are distinct part numbers, not drop-in replacements for 2M20Z.

What is the thermal resistance from junction to lead (θ_JL) for 2M20Z?

The typical junction-to-lead thermal resistance (θ_JL) for 2M20Z is 20 °C/W when leads are trimmed to 0.375″ (9.55 mm) and soldered to a 10 mm × 10 mm Cu pad, per Figure 8 in the N2105 datasheet. This value drops with longer leads and rises with shorter ones-designers must consult the transient thermal response curve (Fig.9) for pulsed power applications.