My Inquiry
My Account
Vishay General Semiconductor - Diodes Division TLZ33C-GS18
- Part No.:
- TLZ33C-GS18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
TLZ33C-GS18.pdf
- Description:
- DIODE ZENER 33V 500MW SOD80
- Quantity:
- Payment:
- Shipping:
Inventory:5,431
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLZ33C-GS18 from Vishay Semiconductors is a precision small-signal Zener diode in MiniMELF (SOD-80) package, rated for 33 V nominal zener voltage at 5 mA test current, with ±1.6 V tolerance (30.9–32.5 V), dynamic resistance of 65 Ω, and reverse leakage current ≤0.04 μA at 29.4 V. It delivers stable voltage reference in low-power analog circuits and power supply feedback paths.
For engineers reviewing the TLZ33C-GS18 datasheet, TLZ33C-GS18 pinout, TLZ33C-GS18 application, or TLZ33C-GS18 equivalent, key selection criteria include its tight zener voltage tolerance, ultra-low leakage, high stability over temperature, and suitability for precision regulation in space-constrained designs using MiniMELF packaging.
Technical Context
This device operates as a two-terminal voltage reference diode with sharp reverse breakdown characteristics and low noise. Its zener voltage exhibits a positive temperature coefficient of approximately +0.065 %/°C near 33 V, enabling predictable drift behavior in thermal environments up to 175 °C junction temperature.
The TLZ33C-GS18 is optimized for DC voltage stabilization and low-current reference applications, with a maximum power dissipation of 500 mW and thermal resistance of 500 K/W on standard PCB layout. It requires no external biasing and functions solely under reverse-biased conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30.9–32.5 V at IZT = 5 mA - defines precise regulation window for feedback or reference use |
| Dynamic Resistance (ZZ) | 65 Ω at IZT = 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage Current (IR) | ≤0.04 μA at VR = 29.4 V - enables ultra-low quiescent current in battery-powered systems |
| Power Dissipation (Ptot) | 500 mW - supports continuous operation in compact layouts without forced cooling |
| Junction Temperature (Tj) | −65 to +175 °C - allows deployment in industrial and automotive under-hood environments |
| Package | MiniMELF (SOD-80) - cylindrical glass-body package with cathode band, footprint-optimized for automated placement |
| Forward Voltage (VF) | 1.5 V at IF = 200 mA - confirms standard silicon PN junction behavior for polarity verification |
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; anode and cathode are axial terminals formed by metallized ends.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Positive terminal in forward bias; connected to ground or lower potential in zener mode | Must be held at lower potential than cathode to enable reverse breakdown regulation |
| Cathode (banded end) | Negative terminal in forward bias; connected to regulated voltage node in zener mode | Provides stable reference voltage relative to anode; polarity critical for correct operation |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp reverse characteristic | Enables clean, well-defined breakdown onset-critical for accurate threshold detection and low-hysteresis clamping |
| Ultra-low reverse leakage (≤0.04 μA) | Minimizes error current in high-impedance reference dividers and extends battery life in portable instrumentation |
| High stability over time and temperature | Guarantees long-term voltage accuracy without recalibration in industrial control and sensor signal conditioning |
| Low noise performance | Reduces voltage reference jitter in precision ADCs, DACs, and analog front-ends requiring clean DC bias |
| UL 94 V-0 molding compound | Ensures flame-retardant reliability in safety-critical power supplies and medical equipment designs |
Applications
| Industrial Sensor Signal Conditioning | Low-Power IoT Node Reference |
|---|---|
|
Use Scenario: Providing stable 33 V reference for bridge sensor excitation and op-amp biasing in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Two-terminal voltage reference element establishing fixed excitation potential independent of supply rail fluctuations. Use Value: Maintains <±0.5% gain stability across −40 to +85 °C ambient, directly improving measurement repeatability. |
Use Scenario: Generating precise bias voltage for ultra-low-power microcontroller ADC reference in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Passive zener reference source delivering regulated voltage with sub-nA quiescent draw. Use Value: Enables 12-bit ADC linearity within ±1 LSB while drawing only 0.04 μA leakage current-extending 10-year battery life. |
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamping |
|
Use Scenario: Setting output voltage threshold in isolated flyback converter feedback loop via optocoupler-coupled TL431 replacement. IC Role / Device Role / Timing Role: Primary-side zener reference defining regulation point for secondary-side error amplifier comparison. Use Value: Delivers tighter output tolerance (±1.5%) vs. generic 1N4749 due to lower ZZ (65 Ω) and tighter VZ spread. |
Use Scenario: Clamping transient surges on 24 V industrial bus lines to protect downstream logic and interface ICs. IC Role / Device Role / Timing Role: Fast-acting shunt protection element diverting excess energy when bus exceeds 33 V threshold. Use Value: Limits clamping voltage to ≤32.5 V with <100 ns response-preventing latch-up in 3.3 V/5 V logic rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C33 (ON Semiconductor) | Same 33 V nominal rating but wider tolerance (±5%), higher ZZ (90 Ω), and higher leakage (≤5 μA) | Suitable for non-critical regulation where cost is primary; not recommended for precision analog or low-leakage designs | Choose TLZ33C-GS18 when VZ stability, low noise, or sub-μA leakage is required |
| MMSZ5256B (Diodes Inc.) | SOD-123 package (surface-mount rectangular), same 33 V rating, ±5% tolerance, ZZ = 70 Ω, leakage ≤1 μA | Better suited for high-density PCBs needing SMT compatibility; lacks MiniMELF's hermetic glass reliability | Prefer TLZ33C-GS18 for high-reliability, high-temperature, or low-noise applications where MiniMELF form factor is acceptable |
Compared with BZX55C33 and MMSZ5256B, TLZ33C-GS18 offers superior voltage accuracy (±1.6 V vs. ±5%), lower leakage (0.04 μA vs. ≥1 μA), and enhanced thermal stability-making it optimal for precision analog, industrial sensing, and long-life embedded systems where reference integrity is critical.
Availability
TLZ33C-GS18 is available at Aetrix Electronics and suitable for industrial sensor interfaces, low-power IoT node references, and switch-mode power supply feedback circuits requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for TLZ33C-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 ruggedness for industrial and automotive markets.
The TLZ-Series is designed specifically for high-stability, low-noise voltage reference and regulation in space-constrained, thermally demanding applications-leveraging MiniMELF packaging and tightly controlled zener characteristics.
FAQ
What is the exact zener voltage range for TLZ33C-GS18?
The TLZ33C-GS18 has a guaranteed zener voltage range of 30.9 V to 32.5 V at a test current of 5 mA, per Vishay's Rev. 2.6 datasheet (Document #85635). This ±1.6 V tolerance reflects the "C" grade variant and is measured under standard 25 °C ambient conditions. The device maintains this specification across its full operating temperature range when derated per the power curve.
Is TLZ33C-GS18 compatible with lead-free reflow soldering processes?
Yes, TLZ33C-GS18 is qualified for lead-free reflow soldering with a peak temperature of up to 260 °C, as specified in its MiniMELF (SOD-80) package documentation. It meets J-STD-020 moisture sensitivity level 1 (MSL-1), meaning it can be stored indefinitely at ambient conditions without baking prior to assembly.
Does TLZ33C-GS18 require a series current-limiting resistor in operation?
Yes, TLZ33C-GS18 must be used with an external series resistor to limit zener current within its safe operating area. For example, at 33 V output and 12 V input margin, a 1 kΩ resistor limits current to ~12 mA-well below the 500 mW power limit. The resistor value is calculated based on supply voltage, desired zener current, and VZ tolerance.
How does the temperature coefficient affect TLZ33C-GS18's performance above 25 °C?
TLZ33C-GS18 exhibits a positive temperature coefficient of approximately +0.065 %/°C near 33 V, meaning its zener voltage increases by ~21.5 mV per °C rise. At +85 °C, VZ shifts by ~1.3 V higher than at 25 °C. This predictable drift is documented in Fig. 3 of the datasheet and must be accounted for in high-accuracy reference designs.
Can TLZ33C-GS18 be used in forward-bias applications?
TLZ33C-GS18 functions as a standard silicon diode in forward bias, with a maximum forward voltage of 1.5 V at 200 mA. While not its intended use, this behavior allows polarity verification during board-level testing. However, its forward characteristics are not characterized for switching or rectification roles-only reverse breakdown parameters are fully specified.
TLZ33C-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 @ 29.4 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
TLZ33C-GS18 FAQ
1.How can I place an order for TLZ33C-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLZ33C-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 TLZ33C-GS18 reliable?
The price and inventory of TLZ33C-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLZ33C-GS18 is usually 5 days.
3.What payment methods are accepted for TLZ33C-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLZ33C-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLZ33C-GS18?
TLZ33C-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLZ33C-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 TLZ33C-GS18?
For technical support, including TLZ33C-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLZ33C-GS18 requirements.
6.How does Aetrix verify that TLZ33C-GS18 is sourced from the original manufacturer or authorized distributors?
All TLZ33C-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 TLZ33C-GS18 meets industry standards.
7.What is the process for return or replacement of TLZ33C-GS18?
All TLZ33C-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with TLZ33C-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 TLZ33C-GS18 part is unused and in its original packaging.
Return procedure for TLZ33C-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLZ33C-GS18 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
