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Vishay General Semiconductor - Diodes Division TLZ33B-GS18
- Part No.:
- TLZ33B-GS18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
TLZ33B-GS18.pdf
- Description:
- DIODE ZENER 33V 500MW SOD80
- Quantity:
- Payment:
- Shipping:
Inventory:5,697
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Product details
Overview
TLZ33B-GS18 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 operation in voltage reference and overvoltage protection applications.
For engineers reviewing the TLZ33B-GS18 datasheet, TLZ33B-GS18 pinout, TLZ33B-GS18 application, or TLZ33B-GS18 equivalent, key selection criteria include its 33 V nominal breakdown, 500 mW power rating, MiniMELF thermal performance (RthJA = 500 K/W), low-noise stabilization capability, and compatibility with automated SMT placement on 8 mm tape reels.
Technical Context
The TLZ33B-GS18 operates as a single-element, two-terminal voltage reference device with sharp reverse breakdown characteristics and high long-term stability. Its design targets low-noise, low-drift DC biasing and clamping where tight voltage tolerance and minimal dynamic impedance are critical.
It exhibits a temperature coefficient of approximately +0.065 %/°C near 33 V (derived from Fig. 3), supports continuous operation up to 175 °C junction temperature, and maintains specified parameters under pulsed test conditions (IZT1 = 5 mA, IZT2 = 0.5 mA) per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener voltage (VZ) | 30.32–31.88 V at 5 mA - defines precise regulation point for feedback loops and reference rails |
| Power dissipation (Ptot) | 500 mW - sets maximum continuous DC or average pulsed power handling on standard PCB |
| Dynamic resistance (ZZ) | 65 Ω at 5 mA - determines output impedance and load regulation sensitivity in shunt regulator designs |
| Reverse leakage current (IR) | ≤0.04 μA at 28.8 V - ensures minimal error current in high-impedance reference nodes |
| Junction temperature (Tj) | −65 to +175 °C - enables deployment in extended industrial and automotive under-hood environments |
| Package | MiniMELF (SOD-80) - surface-mount cylindrical package with 3.3 mm body length and 1.4 mm diameter for high reliability and thermal cycling endurance |
| Moisture sensitivity | MSL Level 1 - no floor life limitation; suitable for standard reflow without dry-pack requirements |
Pinout & Package
TLZ33B-GS18 is a two-terminal device in MiniMELF (SOD-80) package: anode and cathode are identified by a black cathode band on one end of the cylindrical glass body. The package has no leads; terminals are formed by metallized ends of the glass-encapsulated silicon die.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener mode | Must be held ≤ (VZ − 0.7 V) relative to cathode to avoid forward conduction during regulation |
| Cathode | Current exit terminal in forward bias; connected to higher-potential node in Zener mode | Marked with black band; serves as regulated output node in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp reverse characteristic | Enables clean, well-defined breakdown onset-critical for accurate threshold detection and clamping |
| Low reverse leakage current | ≤0.04 μA at 28.8 V minimizes error in high-impedance reference dividers and sensor bias networks |
| High stability and low noise | Supports precision analog signal chains requiring drift <100 ppm/1000 h and minimal voltage ripple |
| MiniMELF ruggedness | Hermetically sealed glass package withstands >1000 thermal cycles and offers superior moisture resistance vs. plastic SMD packages |
| UL 94 V-0 molding compound | Ensures flame-retardant behavior in safety-critical power supply and industrial control applications |
Applications
| Reference Voltage Source | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 33 V reference for ADC voltage references and op-amp biasing in data acquisition systems. IC Role / Device Role / Timing Role: Shunt-connected Zener diode acting as passive voltage reference node. Use Value: Delivers 33 V ±1.5% with 65 Ω dynamic impedance, minimizing load-induced error in 12-bit+ measurement systems. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding 33 V. IC Role / Device Role / Timing Role: Two-terminal voltage clamp limiting input voltage to safe levels during ESD or surge events. Use Value: Activates at 30.32 V with sharp knee, clamping within 100 ns while dissipating up to 500 mW peak energy. |
| Power Supply Feedback | Current Source Bias |
Use Scenario: Setting output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Precision Zener element in secondary-side error amplifier reference path. Use Value: Maintains regulation accuracy across −40 to +125 °C ambient with <±0.065 %/°C TC, reducing output drift. |
Use Scenario: Establishing stable bias current for LED drivers or transistor amplifiers using constant-current sink topology. IC Role / Device Role / Timing Role: Voltage reference defining emitter/base voltage drop in current mirror configurations. Use Value: Low 0.04 μA leakage ensures minimal current error in nanoamp-level bias circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C33 (ON Semiconductor) | DO-35 package, 500 mW, 32.3–33.7 V at 5 mA, 80 Ω ZZ, MSL Level 1 | Larger DO-35 footprint; higher dynamic resistance reduces regulation precision in low-current references | Choose for legacy through-hole compatibility or cost-sensitive non-precision designs |
| MMSZ5256B (Diodes Inc.) | SOD-123 package, 500 mW, 31.35–33.65 V at 20 mA, 35 Ω ZZ, MSL Level 1 | Lower ZZ improves load regulation but requires 20 mA test current-less optimal for low-power biasing | Prefer when tighter dynamic impedance is needed and higher test current is acceptable |
Compared with TLZ33B-GS18, BZX55C33 trades MiniMELF reliability and low-leakage performance for legacy package compatibility, while MMSZ5256B offers lower impedance at higher test current but less suitability for ultra-low-current reference nodes.
Availability
TLZ33B-GS18 is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and power supply feedback applications requiring stable component supply, consistent parametric performance, and long-term availability in industrial and medical electronics.
Supply support for TLZ33B-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, and optoelectronics for industrial, automotive, and computing markets.
The TLZ-Series is engineered for high-stability, low-noise voltage regulation in space-constrained SMT designs, targeting applications demanding long-term parameter consistency and robust thermal performance.
FAQ
What is the exact zener voltage range for TLZ33B-GS18 at 5 mA test current?
The TLZ33B-GS18 has a guaranteed zener voltage range of 30.32 V to 31.88 V when measured at IZT = 5 mA and TA = 25 °C, corresponding to a ±1.5% tolerance about the nominal 33 V rating. This range is explicitly defined in the Vishay TLZ-Series datasheet Rev. 2.6, Table on page 3.
Does TLZ33B-GS18 have a specified temperature coefficient, and how does it affect regulation accuracy?
Yes-TLZ33B-GS18 exhibits a positive temperature coefficient of approximately +0.065 %/°C near 33 V, derived from Figure 3 ("Typical Temperature Coefficient of VZ vs. Z-Voltage") in the datasheet. This means its zener voltage increases by ~21.5 mV/°C, which must be accounted for in wide-temperature-range reference designs.
Can TLZ33B-GS18 be used in surface-mount reflow processes, and what are the soldering limits?
Yes-TLZ33B-GS18 is qualified for standard lead-free reflow per J-STD-020. Its MiniMELF (SOD-80) package has MSL Level 1 rating and supports peak temperatures up to 260 °C. No pre-baking is required, and it withstands typical 60–90 s exposure above 217 °C in profiled reflow ovens.
How does the dynamic resistance of TLZ33B-GS18 impact its performance in a shunt regulator circuit?
With ZZ = 65 Ω at 5 mA, TLZ33B-GS18 introduces measurable output impedance into shunt regulator designs. For example, a 1 mA load variation causes ~65 mV output shift-making it suitable for moderate-precision applications but requiring buffering or compensation in high-accuracy references.
Is TLZ33B-GS18 compliant with RoHS and REACH, and where is this documented?
Yes-TLZ33B-GS18 conforms to RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Compliance is confirmed in Vishay's material declaration document #99912, accessible at www.vishay.com/doc?99912, and reflected in the "Material categorization" section of the TLZ-Series datasheet.
TLZ33B-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):
- 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-GS18 FAQ
1.How can I place an order for TLZ33B-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLZ33B-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 TLZ33B-GS18 reliable?
The price and inventory of TLZ33B-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLZ33B-GS18 is usually 5 days.
3.What payment methods are accepted for TLZ33B-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLZ33B-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLZ33B-GS18?
TLZ33B-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLZ33B-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 TLZ33B-GS18?
For technical support, including TLZ33B-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLZ33B-GS18 requirements.
6.How does Aetrix verify that TLZ33B-GS18 is sourced from the original manufacturer or authorized distributors?
All TLZ33B-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 TLZ33B-GS18 meets industry standards.
7.What is the process for return or replacement of TLZ33B-GS18?
All TLZ33B-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with TLZ33B-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 TLZ33B-GS18 part is unused and in its original packaging.
Return procedure for TLZ33B-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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