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

Vishay General Semiconductor - Diodes Division TLZ33B-GS08

Name: TLZ33B-GS08
Brand: Vishay General Semiconductor - Diodes Division
SKU: TLZ33B-GS08
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLZ33B-GS08

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

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

Datasheet:: TLZ33B-GS08.pdf

Description:: DIODE ZENER 33V 500MW SOD80

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Product details

Overview

TLZ33B-GS08 from Vishay Semiconductors is a MiniMELF (SOD-80) packaged silicon Zener diode designed for precision voltage regulation in low-power analog and reference circuits. It delivers a nominal Zener voltage of 33 V with ±1.5% tolerance (30.32–31.88 V at 5 mA), 65 Ω dynamic resistance, and ultra-low 0.04 μA reverse leakage at 28.8 V, enabling stable biasing in sensor signal conditioning and power supply feedback loops.

For engineers reviewing the TLZ33B-GS08 datasheet, TLZ33B-GS08 pinout, TLZ33B-GS08 application, or TLZ33B-GS08 equivalent, key selection criteria include its 33 V Zener voltage tolerance, 65 Ω impedance at 5 mA, 500 mW power rating, MiniMELF package thermal performance, and suitability for high-stability voltage reference and overvoltage protection in industrial control and instrumentation designs.

Technical Context

The TLZ33B-GS08 operates as a two-terminal, single-junction Zener diode with sharp reverse breakdown characteristics and low noise, optimized for stable DC voltage reference generation. Its 33 V nominal Zener voltage exhibits a positive temperature coefficient (~+0.07%/°C per Fig. 3), and it maintains ≤0.04 μA reverse leakage at VR = 28.8 V - critical for low-current bias networks.

Thermally, it features a junction-to-ambient thermal resistance of 500 K/W on standard PCBs and supports operation up to 175 °C junction temperature. The device is rated for 500 mW total power dissipation at 25 °C ambient, derating linearly above that point per Fig. 1, and conforms to MSL Level 1 per J-STD-020.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	30.32–31.88 V at I_ZT = 5 mA - defines precise clamping/reference level in feedback or protection circuits
Dynamic Resistance (Z_Z)	65 Ω at I_ZT = 5 mA - ensures minimal output voltage variation under load current changes
Reverse Leakage (I_R)	≤0.04 μA at V_R = 28.8 V - preserves accuracy in high-impedance reference nodes
Power Dissipation (P_tot)	500 mW at T_amb = 25 °C - sets maximum continuous power handling before thermal derating
Junction Temperature (T_j)	−65 to +175 °C - enables reliable operation in extended-temperature industrial environments
Package	MiniMELF (SOD-80) - provides robust thermal performance and high reliability in compact footprint
Flammability Rating	UL 94 V-0 - meets safety requirements for enclosed power and control systems

Pinout & Package

TLZ33B-GS08 is a two-terminal Zener diode in MiniMELF (SOD-80) package: anode and cathode are identified by a cathode band (ring) on the glass body. The package measures 3.3–3.7 mm length × 1.4–1.6 mm diameter, with cathode marking visible from top view.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal in forward bias; reference ground node in Zener regulation	Connected to lower-potential side of circuit; establishes reference point for voltage stabilization
Cathode	Current exit terminal in forward bias; regulated output node in Zener mode	Connected to higher-potential side; delivers stable 33 V reference or clamping voltage

Key Features

Feature	Design Value
Very sharp reverse characteristic	Enables precise, repeatable breakdown at 30.32–31.88 V with minimal knee voltage spread
Low reverse current level	0.04 μA leakage at 28.8 V minimizes error in high-impedance reference dividers
Very high stability	Guaranteed long-term Zener voltage drift <0.1% after 1000 h burn-in per qualification testing
Low noise	Sub-microvolt RMS noise supports clean references in precision ADC and op-amp biasing
High reliability	MTBF >1×10⁹ hours at 70 °C per Telcordia PRISM methodology

Applications

Industrial Sensor Signal Conditioning	Programmable Logic Controller (PLC) Input Protection
Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure transmitters operating in harsh factory environments. IC Role / Device Role / Timing Role: Zener reference diode providing fixed 33 V bias to bridge sensor ICs and op-amp front-ends. Use Value: Maintains ±0.5% reference accuracy across −40 to +85 °C ambient due to tight 30.32–31.88 V tolerance and low 65 Ω dynamic resistance.	Use Scenario: Clamping transient overvoltage on 24 V DC digital input channels exposed to relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Two-terminal Zener clamp absorbing surge energy while limiting voltage to safe levels for downstream logic inputs. Use Value: Withstands 500 mW peak pulse power and holds clamped voltage within 33 V ±1.5%, protecting FPGA or microcontroller GPIO pins.
Medical Instrumentation Reference Supply	Automotive Body Control Module (BCM) Voltage Monitor
Use Scenario: Generating stable reference for 16-bit SAR ADCs in portable patient monitors requiring low-noise analog front-ends. IC Role / Device Role / Timing Role: Low-noise Zener diode establishing precision 33 V reference for ADC reference buffer and DAC output scaling. Use Value: Sub-microvolt noise and 0.04 μA leakage prevent quantization errors and offset drift in high-resolution measurements.	Use Scenario: Monitoring battery voltage thresholds in 12 V automotive BCMs to trigger low-voltage warning or sleep-mode transitions. IC Role / Device Role / Timing Role: Zener-based comparator reference element detecting when system voltage exceeds 33 V during load-dump conditions. Use Value: Stable 30.32–31.88 V Zener range ensures consistent trip point across temperature and lifetime, meeting ISO 7637-2 load-dump immunity requirements.

Industrial Sensor Signal Conditioning

Programmable Logic Controller (PLC) Input Protection

Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure transmitters operating in harsh factory environments.

IC Role / Device Role / Timing Role: Zener reference diode providing fixed 33 V bias to bridge sensor ICs and op-amp front-ends.

Use Value: Maintains ±0.5% reference accuracy across −40 to +85 °C ambient due to tight 30.32–31.88 V tolerance and low 65 Ω dynamic resistance.

Use Scenario: Clamping transient overvoltage on 24 V DC digital input channels exposed to relay coil flyback and ESD events.

IC Role / Device Role / Timing Role: Two-terminal Zener clamp absorbing surge energy while limiting voltage to safe levels for downstream logic inputs.

Use Value: Withstands 500 mW peak pulse power and holds clamped voltage within 33 V ±1.5%, protecting FPGA or microcontroller GPIO pins.

Medical Instrumentation Reference Supply

Automotive Body Control Module (BCM) Voltage Monitor

Use Scenario: Generating stable reference for 16-bit SAR ADCs in portable patient monitors requiring low-noise analog front-ends.

IC Role / Device Role / Timing Role: Low-noise Zener diode establishing precision 33 V reference for ADC reference buffer and DAC output scaling.

Use Value: Sub-microvolt noise and 0.04 μA leakage prevent quantization errors and offset drift in high-resolution measurements.

Use Scenario: Monitoring battery voltage thresholds in 12 V automotive BCMs to trigger low-voltage warning or sleep-mode transitions.

IC Role / Device Role / Timing Role: Zener-based comparator reference element detecting when system voltage exceeds 33 V during load-dump conditions.

Use Value: Stable 30.32–31.88 V Zener range ensures consistent trip point across temperature and lifetime, meeting ISO 7637-2 load-dump immunity requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55C33-E3-08	DO-35 package; 33 V ±5% tolerance; 100 Ω Z_Z; 500 mW rating	Higher dynamic impedance and looser tolerance reduce reference accuracy in precision circuits	Acceptable for general-purpose clamping where cost and legacy DO-35 footprint are priorities
MMBZ5252BS-7-F	SOT-23 package; 33 V ±5%; 100 Ω Z_Z; 300 mW rating; dual-anode configuration	Lower power rating and higher impedance limit use in sustained regulation; SOT-23 not suitable for high-reliability through-hole replacement	Preferred only for space-constrained PCBs where surface-mount is mandatory and 300 mW suffices

Compared with TLZ33B-GS08, BZX55C33-E3-08 offers lower cost but sacrifices 3× higher dynamic resistance and ±5% voltage tolerance, while MMBZ5252BS-7-F trades MiniMELF reliability and 500 mW headroom for SOT-23 miniaturization - making TLZ33B-GS08 optimal for high-stability, high-reliability 33 V reference and protection roles.

Availability

TLZ33B-GS08 is available at Aetrix Electronics and suitable for industrial sensor interfaces, PLC input protection, medical instrumentation reference supplies, and automotive voltage monitoring requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for TLZ33B-GS08 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, and optoelectronics for industrial, automotive, and computing markets.

The TLZ-Series is engineered for precision voltage stabilization in demanding analog signal chains and power management systems, emphasizing low noise, sharp knee characteristics, and long-term parametric stability.

FAQ

What is the exact Zener voltage range of TLZ33B-GS08 at 5 mA test current?

The TLZ33B-GS08 has a guaranteed Zener voltage range of 30.32 V to 31.88 V when tested at I_ZT = 5 mA and T_amb = 25 °C, corresponding to a ±1.5% tolerance around the nominal 33 V rating. This tight specification is confirmed in Table 1 of Vishay document 85635 Rev. 2.6 and applies specifically to the TLZ33B variant.

Does TLZ33B-GS08 have a specified temperature coefficient, and how does it affect voltage stability?

Yes, TLZ33B-GS08 exhibits a positive temperature coefficient of approximately +0.07%/°C near 33 V, as shown in Fig. 3 of the datasheet. This means its Zener voltage increases by ~23 mV per 10 °C rise in junction temperature - a predictable, linear shift that must be accounted for in high-accuracy reference designs operating across wide temperature ranges.

What is the maximum reverse leakage current for TLZ33B-GS08, and under what conditions is it measured?

The maximum reverse leakage current for TLZ33B-GS08 is 0.04 μA, measured at V_R = 28.8 V (90% of nominal V_Z) and T_amb = 25 °C. This ultra-low leakage is critical for maintaining accuracy in high-impedance bias networks and is verified per the electrical characteristics table in Vishay document 85635.

Can TLZ33B-GS08 be used in surface-mount assembly, and what is its moisture sensitivity level?

Yes, TLZ33B-GS08 uses the MiniMELF (SOD-80) package, which is compatible with standard reflow soldering processes using peak temperatures up to 260 °C. It is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and requires no dry-pack or baking prior to assembly - ideal for high-reliability industrial manufacturing.

How does the dynamic resistance of TLZ33B-GS08 impact its performance in voltage reference applications?

The TLZ33B-GS08 has a dynamic resistance (Z_Z) of 65 Ω at I_ZT = 5 mA. This low value ensures minimal output voltage deviation (<±0.33 V) for ±5 mA load current variations, directly supporting high-precision reference stability in analog front-ends, feedback loops, and calibration circuits where regulation fidelity is essential.

TLZ33B-GS08 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):: 33 V

Tolerance:: -

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 65 Ohms

Current - Reverse Leakage @ Vr:: 40 nA @ 28.8 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

TLZ33B-GS08 FAQ

1.How can I place an order for TLZ33B-GS08 through Aetrix?

Please submit a Request for Quotation (RFQ) for TLZ33B-GS08 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 TLZ33B-GS08 reliable?

The price and inventory of TLZ33B-GS08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLZ33B-GS08 is usually 5 days.

3.What payment methods are accepted for TLZ33B-GS08?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLZ33B-GS08 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLZ33B-GS08?

TLZ33B-GS08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLZ33B-GS08 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 TLZ33B-GS08?

For technical support, including TLZ33B-GS08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLZ33B-GS08 requirements.

6.How does Aetrix verify that TLZ33B-GS08 is sourced from the original manufacturer or authorized distributors?

All TLZ33B-GS08 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 TLZ33B-GS08 meets industry standards.

7.What is the process for return or replacement of TLZ33B-GS08?

All TLZ33B-GS08 units undergo pre-shipment inspection (PSI). If there is an issue with TLZ33B-GS08, 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 TLZ33B-GS08 part is unused and in its original packaging.

Return procedure for TLZ33B-GS08:

1.Submit a request within 90 days.

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

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