Vishay General Semiconductor - Diodes Division TLZ30D-GS18

Overview

TLZ30D-GS18 from Vishay Semiconductors is a precision small-signal Zener diode in MiniMELF (SOD-80) package, designed for voltage regulation and reference applications. It delivers a nominal Zener voltage of 30.5 V at 5 mA test current, with dynamic resistance of 55 Ω and reverse leakage current ≤0.04 μA at 27.6 V, enabling stable low-noise voltage references in power supply feedback loops and analog sensor conditioning circuits.

For engineers reviewing the TLZ30D-GS18 datasheet, TLZ30D-GS18 pinout, TLZ30D-GS18 application, or TLZ30D-GS18 equivalent, key selection criteria include its tight 29.02–30.51 V Zener voltage range, MSL Level 1 moisture sensitivity, 500 mW power rating, and compatibility with reflow soldering up to 260 °C peak temperature.

Technical Context

This device operates as a two-terminal voltage reference diode with sharp reverse breakdown characteristics and ultra-low noise-critical for high-precision analog circuits. Its thermal coefficient of ±0.04 %/°C (typical near 30 V) and junction temperature limit of 175 °C support operation in industrial environments where thermal stability is essential.

The TLZ30D-GS18 exhibits low dynamic impedance (55 Ω at 5 mA), enabling effective ripple suppression in shunt-regulated supplies. Its MiniMELF package provides superior thermal performance over standard DO-35, with R_thJA = 500 K/W on a 50 mm × 50 mm × 1.6 mm PCB, supporting reliable power dissipation up to 500 mW at 25 °C ambient.

Key Specifications

Pinout & Package

MiniMELF (SOD-80) package: cylindrical glass body, 3.3–3.7 mm length, 1.4–1.6 mm diameter, cathode identified by black band. No internal leads; terminals are anode (unmarked end) and cathode (banded end).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C30LT1G and MMBZ5257B-7-F, TLZ30D-GS18 offers superior voltage stability (±0.5% vs. ±5%), lower dynamic impedance (55 Ω vs. ≥90 Ω), and higher power capability (500 mW vs. ≤350 mW), making it the preferred choice for industrial-grade voltage regulation requiring long-term accuracy and thermal robustness.

Availability

TLZ30D-GS18 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, PLC input protection, and automotive body control modules requiring stable component supply with full traceability and lifecycle continuity.

Supply support for TLZ30D-GS18 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

Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, passive elements, and sensors, with emphasis on reliability, precision, and high-temperature performance.

The TLZ-Series is part of Vishay's precision Zener diode family engineered for voltage reference and stabilization in industrial, automotive, and medical equipment where long-term stability and low noise are mandatory.

FAQ

What is the Zener voltage tolerance of TLZ30D-GS18?

The TLZ30D-GS18 has a guaranteed Zener voltage range of 29.02 V to 30.51 V at 5 mA test current, corresponding to a ±2.5% tolerance about the nominal 30.5 V value. This tight spread is achieved through laser trimming and is documented in Vishay's official datasheet revision 2.6 (June 2024). The TLZ30D-GS18 maintains this specification across its rated temperature range and lifetime.

Does TLZ30D-GS18 require derating above 25 °C ambient?

Yes, TLZ30D-GS18 must be derated linearly above 25 °C ambient temperature. Its maximum power dissipation decreases from 500 mW at 25 °C to zero at 150 °C, based on a thermal resistance of 500 K/W on a standard 50 mm × 50 mm × 1.6 mm PCB. Derating follows the curve in Figure 1 of the TLZ-Series datasheet (Document 85635), ensuring safe operation within its 175 °C junction limit. TLZ30D-GS18 remains fully functional up to 125 °C ambient with appropriate layout.

Is TLZ30D-GS18 compatible with lead-free reflow soldering?

Yes, TLZ30D-GS18 is fully compatible with lead-free reflow soldering per JEDEC J-STD-020. Its MiniMELF (SOD-80) package supports a peak temperature of 260 °C for up to 30 seconds, with MSL Level 1 classification meaning no dry-pack or baking is required prior to assembly. The UL 94 V-0 molding compound ensures flame resistance during thermal cycling. TLZ30D-GS18 has been qualified for IPC-A-610 Class 2 and Class 3 manufacturing standards.

How does TLZ30D-GS18 compare to TLZ30C in terms of voltage range?

TLZ30D-GS18 specifies a Zener voltage range of 29.02 V to 30.51 V, while TLZ30C (same series) is rated 28.36 V to 29.82 V-making TLZ30D-GS18 the highest-voltage variant in the TLZ30x group. Both share identical package, power rating, and dynamic resistance, but TLZ30D-GS18 targets applications needing marginally higher reference voltage, such as 30 V rail monitoring or 3.3 V LDO feedback with resistive divider scaling. TLZ30D-GS18 is not interchangeable with TLZ30C without recalculating divider ratios.

Can TLZ30D-GS18 be used in series or parallel configurations?

TLZ30D-GS18 is designed for single-device shunt regulation and is not recommended for parallel connection due to mismatched dynamic impedances causing current imbalance and thermal runaway. Series connection is possible for higher voltage references (e.g., two TLZ30D-GS18 yield ~61 V), but requires individual current limiting and thermal coupling to avoid voltage drift. For multi-Zener arrays, Vishay's BZX84 series or dedicated reference ICs are more appropriate. TLZ30D-GS18 performs optimally as a standalone precision reference.