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Taiwan Semiconductor Corporation BZV55C18
- Part No.:
- BZV55C18
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
BZV55C18.pdf
- Description:
- DIODE ZENER 18V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:2,343
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Product details
Overview
BZV55C18 from Taiwan Semiconductor is a surface-mount Zener diode with nominal zener voltage 18 V, ±5% tolerance, 500 mW power dissipation, and 5 mA test current, used for precision low-voltage stabilization in DC/DC converters and adapter circuits.
For engineers reviewing the BZV55C18 datasheet, BZV55C18 pinout, BZV55C18 application, or BZV55C18 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (300 °C/W), junction temperature range (–65 to +175 °C), leakage current at 13 V (0.1 µA), and MMELF package compatibility with J-STD-002 soldering standards.
Technical Context
The BZV55C18 operates as a single-die, hermetically sealed glass Zener diode optimized for stable reverse-bias voltage regulation. Its 18 V nominal zener voltage is specified at 5 mA test current (IZT), with dynamic impedance of 50 Ω at IZT and 170 Ω at knee current (IZK = 1.0 mA).
It features a maximum forward voltage of 1 V at 10 mA forward current, junction-to-ambient thermal resistance of 300 °C/W, and operates across –65 to +175 °C junction temperature range - enabling reliable use in thermally constrained industrial and adapter applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.8–19.1 V (±5% tolerance at 5 mA; ensures stable reference within 0.9 V window) |
| Power Dissipation (PD) | 500 mW (limits continuous power handling in compact MMELF package) |
| Zener Impedance (ZZT) | 50 Ω at 5 mA (low dynamic resistance supports tight regulation under load variation) |
| Leakage Current (IR) | 0.1 µA at 13 V (enables low-power standby operation without significant bias error) |
| Junction Temperature (TJ) | –65 to +175 °C (supports operation in extended industrial environments) |
| Forward Voltage (VF) | 1 V at 10 mA (defines minimum forward conduction threshold for polarity verification) |
| Thermal Resistance (RθJA) | 300 °C/W (dictates derating curve above 25 °C ambient; e.g., ~333 mW max at 75 °C) |
Pinout & Package
Package: MMELF (Miniature Metal Electrode Leadless Face), DO-213AA compliant, 3.50 ± 0.20 mm body length, Ø1.50 ± 0.10 mm diameter, matte tin-plated leads, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse bias return path | Connected to lower-potential node in regulation circuit; defines polarity during forward test |
| Cathode | Zener voltage reference node / Reverse bias input | Connected to higher-potential node; output voltage referenced to this terminal in shunt regulator configuration |
Key Features
| Feature | Design Value |
|---|---|
| Hermetically sealed glass construction | Prevents moisture ingress and long-term parameter drift in humid environments |
| ±5% zener voltage tolerance | Enables predictable regulation without post-assembly trimming in cost-sensitive designs |
| RoHS-compliant matte tin plating | Ensures reliable solderability per J-STD-002 and eliminates lead-based process concerns |
| Single-die MMELF configuration | Provides standardized footprint for automated placement and reflow compatibility |
Applications
| Low-Voltage Stabilizers | On-Board DC/DC Converters |
|---|---|
Use Scenario: Providing stable 18 V reference for feedback networks in isolated flyback or buck-derived supplies. IC Role / Device Role / Timing Role: Shunt voltage reference regulating output via optocoupler feedback loop. Use Value: Maintains ±5% output accuracy over temperature and line variations without active compensation. | Use Scenario: Biasing gate drivers or auxiliary rails in point-of-load converters operating from 24 V bus. IC Role / Device Role / Timing Role: Clamping transient overshoot and stabilizing local 18 V rail for controller ICs. Use Value: Limits voltage excursions to <19.1 V, protecting downstream logic and analog circuitry. |
| AC/DC Adapters | Industrial Sensor Signal Conditioning |
Use Scenario: Secondary-side voltage reference in offline SMPS for consumer wall adapters. IC Role / Device Role / Timing Role: Zener-based feedback element in TL431-less designs requiring minimal BOM count. Use Value: Reduces component count and cost while meeting IEC 61000-4-5 surge immunity requirements. | Use Scenario: Precision biasing of bridge amplifiers or RTD excitation circuits in 4–20 mA transmitters. IC Role / Device Role / Timing Role: Stable 18 V reference source for ratiometric ADC excitation and op-amp supply. Use Value: Enables <0.1% full-scale error contribution from reference drift over –40 to +85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5245B (ON Semiconductor) | Same 18 V nominal, SOT-23 package, 225 mW PD, 30 Ω ZZT | Lower power rating; requires layout change due to SOT-23 footprint | Select when board space is constrained and thermal load permits lower dissipation |
| BZX55C18 (Nexperia) | Same 18 V nominal, ±5%, MMELF package, 500 mW PD, 50 Ω ZZT | Identical electrical and mechanical specs; RoHS-compliant, JEDEC DO-213AA compliant | Drop-in replacement with verified sourcing continuity and identical test conditions |
Compared with MMBZ5245B, BZV55C18 delivers 122% higher power handling and identical voltage tolerance in the same legacy MMELF form factor; versus BZX55C18, it offers equivalent performance with distinct manufacturer qualification and traceability for dual-sourcing programs.
Availability
BZV55C18 is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, and AC/DC adapters requiring stable component supply with consistent MMELF packaging and ±5% zener tolerance.
Supply support for BZV55C18 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, rectifiers, and protection components with global distribution and AEC-Q200 qualified lines.
The BZV55C18 belongs to TSC's BZV55C series of precision Zener diodes designed for industrial-grade voltage reference and stabilization in space-constrained, thermally demanding applications.
FAQ
What is the zener voltage tolerance of BZV55C18?
The BZV55C18 has a nominal zener voltage of 18 V with a standard tolerance of ±5%, corresponding to a guaranteed range of 16.8 V to 19.1 V when tested at 5 mA (IZT). This tolerance is confirmed in the Electrical Specifications table on page 2 of the H2301 datasheet and applies under pulse test conditions (30 ms duration).
What package type does BZV55C18 use?
BZV55C18 uses the MMELF (Miniature Metal Electrode Leadless Face) package, compliant with JEDEC DO-213AA, featuring a 3.50 ± 0.20 mm body length and Ø1.50 ± 0.10 mm diameter. It has matte tin-plated leads and a visible cathode band for polarity identification, as documented in the Mechanical Data and Package Outline Dimensions sections.
What is the maximum power dissipation for BZV55C18?
The BZV55C18 has a maximum power dissipation (PD) of 500 mW at 25 °C ambient temperature. Derating is required above 25 °C at 3.33 mW/°C (based on RθJA = 300 °C/W), reaching zero dissipation at 175 °C junction temperature - consistent with Absolute Maximum Ratings on page 2 of the datasheet.
What is the leakage current specification for BZV55C18?
The leakage current (IR) for BZV55C18 is specified as 0.1 µA maximum at a reverse voltage (VR) of 13 V, measured at 25 °C. This value appears in the Electrical Specifications table under "IR @ VR" and reflects the device's ability to maintain high impedance below its zener knee, critical for low-power biasing applications.
Is BZV55C18 RoHS compliant?
Yes, BZV55C18 is RoHS compliant, as explicitly stated in the FEATURES section of the datasheet. The device uses matte tin-plated leads and meets the EU Directive 2011/65/EU requirements, with no restricted substances exceeding allowable thresholds - confirmed in the compliance statement on page 1.
BZV55C18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-213AC, MINI-MELF, SOD-80
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 50 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 13 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 10 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Mini MELF
BZV55C18 FAQ
1.How can I place an order for BZV55C18 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZV55C18 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 BZV55C18 reliable?
The price and inventory of BZV55C18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZV55C18 is usually 5 days.
3.What payment methods are accepted for BZV55C18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZV55C18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZV55C18?
BZV55C18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZV55C18 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 BZV55C18?
For technical support, including BZV55C18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZV55C18 requirements.
6.How does Aetrix verify that BZV55C18 is sourced from the original manufacturer or authorized distributors?
All BZV55C18 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 BZV55C18 meets industry standards.
7.What is the process for return or replacement of BZV55C18?
All BZV55C18 units undergo pre-shipment inspection (PSI). If there is an issue with BZV55C18, 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 BZV55C18 part is unused and in its original packaging.
Return procedure for BZV55C18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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