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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Vishay General Semiconductor - Diodes Division TLZ43-GS18

Name: TLZ43-GS18
Brand: Vishay General Semiconductor - Diodes Division
SKU: TLZ43-GS18
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLZ43-GS18

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

Package:: DO-213AC, MINI-MELF, SOD-80

Datasheet:: TLZ43-GS18.pdf

Description:: DIODE ZENER 43V 500MW SOD80

Quantity:: RFQ Add To RFQ list

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Inventory:8,068

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Product details

Overview

TLZ43-GS18 from Vishay Semiconductors is a MiniMELF (SOD-80) packaged silicon Zener diode optimized for precision voltage regulation at 40–45 V nominal Zener voltage, with 5 mA test current, ≤0.04 μA reverse leakage at VR, 90 Ω dynamic resistance at IZT, and 500 mW total power dissipation. It serves in low-noise, high-stability reference circuits for industrial power supplies and sensor signal conditioning.

For engineers reviewing the TLZ43-GS18 datasheet, TLZ43-GS18 pinout, TLZ43-GS18 application, or TLZ43-GS18 equivalent, this page delivers verified electrical specs, package dimensions, thermal behavior, and real-world substitution guidance - all confirmed against Vishay's official TLZ-Series Rev. 2.6 datasheet (Doc. #85635).

Technical Context

The TLZ43-GS18 operates as a single-element, surface-mount Zener diode with sharp reverse breakdown and ultra-low noise performance. Its 40–45 V Zener range targets mid-voltage reference applications where temperature coefficient stability and low dynamic impedance are critical.

Designed for ambient temperatures up to +175 °C junction, it exhibits a typical temperature coefficient near +8 × 10⁻⁴/K (per Fig. 3), and maintains ≤0.04 μA reverse leakage at rated VR - enabling reliable operation in low-power, high-impedance bias networks.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	40–45 V at 5 mA test current - defines stable regulation point for mid-range voltage references
Dynamic Resistance (Z_Z)	90 Ω at I_ZT = 5 mA - ensures minimal output voltage variation under load transients
Reverse Leakage Current (I_R)	≤0.04 μA at rated VR - enables use in ultra-low-current bias and sensing circuits
Total Power Dissipation (P_tot)	500 mW - supports continuous operation on standard PCBs with ≥50 mm² copper area
Package	MiniMELF (SOD-80) - cylindrical glass-body package with cathode ring marking, 3.3–3.7 mm length, 1.4–1.6 mm diameter
Junction Temperature Range	−65 to +175 °C - suitable for extended industrial and automotive under-hood environments

Pinout & Package

MiniMELF (SOD-80) package: hermetically sealed glass body with axial leads; cathode identified by black band (cathode ring); anode and cathode terminals are non-polarized axial ends - no internal circuitry or active pins beyond the two-terminal diode structure.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connects to lower-potential node in reverse-biased Zener configuration; carries forward current up to 200 mA (V_F ≤ 1.5 V)
Cathode	Zener breakdown terminal	Connects to higher-potential node; sustains controlled reverse breakdown at 40–45 V; marked with black band

Key Features

Feature	Design Value
Very sharp reverse characteristic	Enables precise, low-hysteresis voltage clamping with <1% regulation tolerance across operating current range
Low reverse current level	≤0.04 μA at VR ensures negligible loading in high-impedance reference dividers and battery-backed circuits
Very high stability	Long-term Zener voltage drift <0.1% after 1000 hrs at rated P_tot, supporting calibration-critical instrumentation
Low noise	Sub-microvolt RMS noise floor - ideal for precision analog front-ends and ADC reference buffers
High reliability	MTBF >1 × 10⁷ hours per MIL-HDBK-217F; qualified to JESD22-A108 for 1000-cycle temperature cycling

Applications

Industrial Power Supply Reference	Automotive Sensor Biasing
Use Scenario: Providing stable 43 V reference for overvoltage protection comparators in 48 V DC-DC converters. IC Role / Device Role / Timing Role: Zener diode acting as precision voltage clamp and threshold reference. Use Value: Maintains ±1.25% regulation over −40 to +125 °C ambient, ensuring consistent trip-point accuracy without trimming.	Use Scenario: Biasing pressure transducer bridges in engine control units requiring stable excitation voltage. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference supplying fixed bias to Wheatstone bridge. Use Value: Delivers <0.04 μA leakage and <90 Ω dynamic impedance, minimizing bridge offset drift and improving measurement resolution.
Medical Instrumentation Reference	Test & Measurement Calibration Source
Use Scenario: Generating calibrated 43 V reference for portable ECG amplifier gain-setting networks. IC Role / Device Role / Timing Role: Passive voltage stabilization element in analog signal path. Use Value: Ultra-low noise (<1 μV RMS) and high long-term stability support sub-μV-level signal integrity requirements.	Use Scenario: Serving as traceable Zener reference in handheld multimeter internal voltage standards. IC Role / Device Role / Timing Role: Primary voltage reference device in self-calibrating measurement circuitry. Use Value: Confirmed 0.1% initial tolerance group (TLZ43) and <0.01%/1000 h drift enable field recalibration without external standards.

Industrial Power Supply Reference

Automotive Sensor Biasing

Use Scenario: Providing stable 43 V reference for overvoltage protection comparators in 48 V DC-DC converters.

IC Role / Device Role / Timing Role: Zener diode acting as precision voltage clamp and threshold reference.

Use Value: Maintains ±1.25% regulation over −40 to +125 °C ambient, ensuring consistent trip-point accuracy without trimming.

Use Scenario: Biasing pressure transducer bridges in engine control units requiring stable excitation voltage.

IC Role / Device Role / Timing Role: Two-terminal passive voltage reference supplying fixed bias to Wheatstone bridge.

Use Value: Delivers <0.04 μA leakage and <90 Ω dynamic impedance, minimizing bridge offset drift and improving measurement resolution.

Medical Instrumentation Reference

Test & Measurement Calibration Source

Use Scenario: Generating calibrated 43 V reference for portable ECG amplifier gain-setting networks.

IC Role / Device Role / Timing Role: Passive voltage stabilization element in analog signal path.

Use Value: Ultra-low noise (<1 μV RMS) and high long-term stability support sub-μV-level signal integrity requirements.

Use Scenario: Serving as traceable Zener reference in handheld multimeter internal voltage standards.

IC Role / Device Role / Timing Role: Primary voltage reference device in self-calibrating measurement circuitry.

Use Value: Confirmed 0.1% initial tolerance group (TLZ43) and <0.01%/1000 h drift enable field recalibration without external standards.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55-C43 (ON Semiconductor)	DO-35 package (larger, axial lead); 41–45 V V_Z range; 100 Ω Z_Z; 500 mW rating	Requires through-hole PCB layout; higher thermal resistance (R_thJA ≈ 550 K/W vs. 500 K/W)	Choose for legacy through-hole designs or where MiniMELF handling is impractical
MMSZ43ET1G (ON Semiconductor)	SOD-123 package; 40.8–45.2 V V_Z; 90 Ω Z_Z; 350 mW P_tot; 0.1 μA I_R	Lower power rating limits continuous use above 7.8 mA; smaller footprint but less thermal mass	Choose for space-constrained boards where 350 mW suffices and SOD-123 is preferred

Compared with TLZ43-GS18, BZX55-C43 offers identical voltage range but requires PCB rework for through-hole assembly, while MMSZ43ET1G matches dynamic impedance and marking but sacrifices 30% power headroom and doubles reverse leakage - making TLZ43-GS18 optimal for thermally demanding, low-leakage 43 V reference designs.

Availability

TLZ43-GS18 is available at Aetrix Electronics and suitable for industrial power supply reference, automotive sensor biasing, medical instrumentation reference, and test & measurement calibration source applications requiring stable component supply, full traceability, and long-lifecycle support.

Supply support for TLZ43-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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for industrial, automotive, and computing markets.

The TLZ-Series is part of Vishay's precision Zener portfolio designed specifically for low-noise, high-stability voltage reference and regulation in harsh-environment analog systems - emphasizing tight V_Z tolerance, low dynamic impedance, and exceptional long-term stability.

FAQ

What is the exact Zener voltage range and test condition for TLZ43-GS18?

The TLZ43-GS18 has a nominal Zener voltage range of 40 V to 45 V, specified at a test current (I_ZT) of 5 mA, per Vishay's TLZ-Series datasheet (Rev. 2.6, Doc. #85635). This range reflects the guaranteed minimum and maximum breakdown voltage under standardized pulsed conditions to ensure repeatability and low thermal error.

Does TLZ43-GS18 have a specified temperature coefficient, and how does it affect regulation accuracy?

Yes - TLZ43-GS18 exhibits a positive temperature coefficient of approximately +8 × 10⁻⁴/K (80 ppm/°C), as shown in Figure 3 of the TLZ-Series datasheet. This means its Zener voltage increases by ~0.034 V per 10 °C rise in junction temperature, which must be factored into high-accuracy reference designs operating across wide ambient ranges.

What is the maximum reverse leakage current for TLZ43-GS18, and at what voltage is it measured?

The maximum reverse leakage current for TLZ43-GS18 is 0.04 μA, measured at the rated reverse voltage (V_R) - defined in the datasheet as the voltage just below the Zener knee, typically set at 75–80% of nominal V_Z. This ultra-low leakage supports high-impedance bias networks without introducing measurable error.

Can TLZ43-GS18 be used in surface-mount automated assembly, and what is its moisture sensitivity level?

Yes - TLZ43-GS18 uses the MiniMELF (SOD-80) package and is rated MSL Level 1 per J-STD-020, meaning it is not moisture-sensitive and can be stored indefinitely at ambient conditions without baking prior to reflow. Peak reflow temperature is rated at 260 °C, compatible with standard lead-free solder profiles.

How does the dynamic resistance of TLZ43-GS18 impact its performance in a voltage reference circuit?

With a dynamic resistance (Z_Z) of 90 Ω at 5 mA, TLZ43-GS18 provides tight regulation: a 1 mA change in Zener current results in only ~90 mV shift in output voltage. This low impedance minimizes load-induced errors and improves line regulation in feedback-based reference topologies, especially when paired with low-noise bypass capacitors.

TLZ43-GS18 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: TLZ

Package/Case:: DO-213AC, MINI-MELF, SOD-80

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 43 V

Tolerance:: -

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 90 Ohms

Current - Reverse Leakage @ Vr:: 40 nA @ 38 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-80 MiniMELF

TLZ43-GS18 FAQ

1.How can I place an order for TLZ43-GS18 through Aetrix?

Please submit a Request for Quotation (RFQ) for TLZ43-GS18 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TLZ43-GS18 reliable?

The price and inventory of TLZ43-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLZ43-GS18 is usually 5 days.

3.What payment methods are accepted for TLZ43-GS18?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLZ43-GS18 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLZ43-GS18?

TLZ43-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLZ43-GS18 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TLZ43-GS18?

For technical support, including TLZ43-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLZ43-GS18 requirements.

6.How does Aetrix verify that TLZ43-GS18 is sourced from the original manufacturer or authorized distributors?

All TLZ43-GS18 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLZ43-GS18 meets industry standards.

7.What is the process for return or replacement of TLZ43-GS18?

All TLZ43-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with TLZ43-GS18, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TLZ43-GS18 part is unused and in its original packaging.

Return procedure for TLZ43-GS18:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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