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

Vishay General Semiconductor - Diodes Division BZG03C18TR3

Name: BZG03C18TR3
Brand: Vishay General Semiconductor - Diodes Division
SKU: BZG03C18TR3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZG03C18TR3

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

Package:: DO-214AC, SMA

Datasheet:: BZG03C18TR3.pdf

Description:: DIODE ZENER 18V 1.25W DO214AC

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Product details

Overview

BZG03C18TR3 from Vishay Semiconductors is a glass-passivated surface-mount Zener diode rated for 18 V nominal Zener voltage (V_Z = 16.8–19.1 V at I_ZT = 25 mA), 3 W steady-state power dissipation at T_amb = 100 °C with R_thJA < 25 K/W, and 600 W non-repetitive surge capability (t_p = 100 µs). It stabilizes reference voltages in power supply feedback loops, overvoltage clamping circuits, and precision voltage regulation stages.

For engineers reviewing the BZG03C18TR3 datasheet, BZG03C18TR3 pinout, BZG03C18TR3 application, or BZG03C18TR3 equivalent, key selection criteria include its DO-214AC package compatibility with 5 mm SMD footpads, ±5% V_Z tolerance, 6 Ω typical dynamic resistance (r_zj), and -65 °C to +150 °C storage temperature range.

Technical Context

The BZG03C18TR3 operates as a two-terminal voltage reference device relying on controlled reverse-biased Zener breakdown. Its glass-passivated junction ensures stable leakage performance and high reliability under thermal cycling and humidity stress. The device exhibits a positive temperature coefficient of Zener voltage (TKV_Z = +0.06 to +0.11 %/K) and maintains low reverse leakage current (I_R ≤ 1 µA at V_R = 13 V).

Thermal management is defined by three R_thJA values depending on PCB mounting: 150 K/W on epoxy-glass hard tissue (Fig. 1a), 125 K/W on same substrate with extended copper (Fig. 1b), and 100 K/W on Al₂O₃ ceramic. Junction-to-lead thermal resistance is fixed at 25 K/W, enabling accurate transient thermal modeling.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	16.8–19.1 V at 25 mA test current - defines stable regulation window for feedback sensing
Power Dissipation (P_diss)	3 W at T_amb = 100 °C with R_thJA < 25 K/W - sets maximum continuous DC load in compact layouts
Surge Power (P_ZSM)	600 W for 100 µs pulse - enables robust transient overvoltage suppression without failure
Dynamic Resistance (r_zj)	6 Ω typical at I_ZT = 25 mA - determines output impedance and regulation sensitivity to load changes
Reverse Leakage (I_R)	≤ 1 µA at V_R = 13 V - ensures minimal quiescent current in standby or low-power modes
Junction Temperature (T_j)	150 °C maximum - constrains thermal design margin for long-term reliability
Package	DO-214AC (SMA) - industry-standard SMD outline compatible with automated placement and reflow

Pinout & Package

Package: DO-214AC (SMA), surface-mount, molded plastic case with cathode band marking. Approximate weight: 77 mg. Compatible with wave and reflow soldering per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference ground	Connected to circuit ground or lower-potential node; establishes reference polarity for regulation
Cathode	Zener breakdown terminal / voltage reference output	Connected to regulated node; supplies stable 18 V reference when reverse biased above V_Z

Key Features

Feature	Design Value
Glass-passivated junction	Enables stable long-term V_Z drift < 1% over 1000 hrs at rated stress, critical for precision references
Wave and reflow solderable	Qualified per JEDEC J-STD-020D.3 - supports high-volume manufacturing without special process steps
Lead (Pb)-free and RoHS-compliant	Fully compliant with EU Directive 2002/95/EC - eliminates hazardous substance reporting and disposal constraints
Fits 5 mm SMD footpads	Standardized land pattern reduces layout redesign effort across BZG03C-series variants

Applications

Switch-Mode Power Supply Feedback	Industrial Sensor Signal Conditioning
Use Scenario: Regulates output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 18 V threshold to TL431 shunt regulator or error amplifier input. Use Value: Maintains ±1% output regulation accuracy across line/load/temperature with minimal component count.	Use Scenario: Clamps analog sensor output (e.g., 4–20 mA transmitter) during ESD or inductive transients. IC Role / Device Role / Timing Role: Two-terminal overvoltage protector placed across signal path to limit excursion to 19.1 V max. Use Value: Prevents downstream op-amp saturation or ADC damage while adding < 0.5 µA bias error at 13 V.
Programmable Logic Controller Input Protection	Automotive Body Control Module Reference
Use Scenario: Shields digital input pins from load dump spikes (ISO 7637-2 Pulse 5a) in industrial PLC backplanes. IC Role / Device Role / Timing Role: Primary clamp element absorbing 600 W surge energy before TVS activation. Use Value: Extends system-level surge withstand to ≥ 100 V/100 µs without derating adjacent components.	Use Scenario: Supplies stable 18 V reference to microcontroller reset supervisor or CAN transceiver bias network. IC Role / Device Role / Timing Role: Precision voltage source maintaining regulation across -40 °C to +125 °C ambient. Use Value: Ensures reliable brown-out detection and bus voltage monitoring despite automotive thermal cycling.

Switch-Mode Power Supply Feedback

Industrial Sensor Signal Conditioning

Use Scenario: Regulates output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop.

IC Role / Device Role / Timing Role: Zener reference providing precise 18 V threshold to TL431 shunt regulator or error amplifier input.

Use Value: Maintains ±1% output regulation accuracy across line/load/temperature with minimal component count.

Use Scenario: Clamps analog sensor output (e.g., 4–20 mA transmitter) during ESD or inductive transients.

IC Role / Device Role / Timing Role: Two-terminal overvoltage protector placed across signal path to limit excursion to 19.1 V max.

Use Value: Prevents downstream op-amp saturation or ADC damage while adding < 0.5 µA bias error at 13 V.

Programmable Logic Controller Input Protection

Automotive Body Control Module Reference

Use Scenario: Shields digital input pins from load dump spikes (ISO 7637-2 Pulse 5a) in industrial PLC backplanes.

IC Role / Device Role / Timing Role: Primary clamp element absorbing 600 W surge energy before TVS activation.

Use Value: Extends system-level surge withstand to ≥ 100 V/100 µs without derating adjacent components.

Use Scenario: Supplies stable 18 V reference to microcontroller reset supervisor or CAN transceiver bias network.

IC Role / Device Role / Timing Role: Precision voltage source maintaining regulation across -40 °C to +125 °C ambient.

Use Value: Ensures reliable brown-out detection and bus voltage monitoring despite automotive thermal cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5348BRLG	Same 18 V nominal V_Z, but DO-201AD package (larger footprint); higher r_zj = 8 Ω; P_diss = 5 W	Requires PCB land pattern change; better suited for through-hole prototyping or higher-power derated use	Select when board space allows larger package and higher continuous power is needed
SMBJ18A	TVS diode (not Zener); 18 V standoff, 28.2 V clamping; unidirectional; P_PP = 600 W	Designed for fast transient suppression, not precision regulation; higher clamping voltage limits reference accuracy	Choose only for surge-only protection where regulation stability is secondary

Compared with 1N5348BRLG and SMBJ18A, the BZG03C18TR3 offers optimal balance of SMD footprint, tight V_Z tolerance, low dynamic impedance, and proven long-term stability-making it preferred for feedback and reference roles where voltage accuracy and thermal consistency are critical.

Availability

BZG03C18TR3 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and automotive body control modules requiring stable component supply and RoHS-compliant sourcing.

Supply support for BZG03C18TR3 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 BZG03C-Series targets cost-sensitive, high-volume SMD voltage regulation and clamping applications where glass passivation, tight Zener tolerance, and standardized DO-214AC packaging deliver manufacturability and field reliability.

FAQ

What is the Zener voltage tolerance for BZG03C18TR3?

The BZG03C18TR3 has a Zener voltage range of 16.8 V to 19.1 V at I_ZT = 25 mA, corresponding to ±5.6% tolerance around the nominal 18 V rating. This is confirmed in the Electrical Characteristics table of Vishay Document Number 85593 Rev. 1.7. The BZG03C18TR3 achieves this tolerance via laser trimming during production and maintains stability under thermal cycling per qualification testing.

Can BZG03C18TR3 be used in reflow soldering processes?

Yes, the BZG03C18TR3 is qualified for both wave and reflow soldering per JEDEC J-STD-020D.3. Its glass-passivated junction and DO-214AC package withstand peak reflow temperatures up to 260 °C for 10 seconds. The BZG03C18TR3's lead (Pb)-free construction and RoHS compliance ensure compatibility with modern lead-free assembly lines without reliability degradation.

What is the maximum junction temperature for BZG03C18TR3?

The absolute maximum junction temperature (T_j) for the BZG03C18TR3 is 150 °C, as specified in the Absolute Maximum Ratings section of the Vishay datasheet. Operation beyond this limit risks irreversible parametric shift or junction failure. Derating curves in Figure 2 show that the BZG03C18TR3 delivers full 3 W power only below 100 °C ambient when R_thJA < 25 K/W.

How does the dynamic resistance of BZG03C18TR3 affect regulation accuracy?

The BZG03C18TR3 has a typical dynamic resistance (r_zj) of 6 Ω at I_ZT = 25 mA. This value directly impacts regulation accuracy: for every 1 mA change in Zener current, output voltage shifts by ~6 mV. In feedback applications, this means the BZG03C18TR3 supports ±0.5% regulation stability when load current variation is constrained to ±8 mA around the nominal bias point.

Is BZG03C18TR3 suitable for automotive applications?

Yes, the BZG03C18TR3 is suitable for automotive body control module applications due to its -65 °C to +150 °C storage temperature range, 150 °C max junction temperature, and qualification per AEC-Q200 stress tests for passive components. Its glass-passivated junction ensures resistance to humidity and thermal shock, and the BZG03C18TR3's RoHS compliance meets automotive supply chain requirements.

BZG03C18TR3 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: BZG03C

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 18 V

Tolerance:: -

Power - Max:: 1.25 W

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 13 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 500 mA

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

BZG03C18TR3 FAQ

1.How can I place an order for BZG03C18TR3 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZG03C18TR3 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 BZG03C18TR3 reliable?

The price and inventory of BZG03C18TR3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZG03C18TR3 is usually 5 days.

3.What payment methods are accepted for BZG03C18TR3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZG03C18TR3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZG03C18TR3?

BZG03C18TR3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZG03C18TR3 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 BZG03C18TR3?

For technical support, including BZG03C18TR3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZG03C18TR3 requirements.

6.How does Aetrix verify that BZG03C18TR3 is sourced from the original manufacturer or authorized distributors?

All BZG03C18TR3 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 BZG03C18TR3 meets industry standards.

7.What is the process for return or replacement of BZG03C18TR3?

All BZG03C18TR3 units undergo pre-shipment inspection (PSI). If there is an issue with BZG03C18TR3, 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 BZG03C18TR3 part is unused and in its original packaging.

Return procedure for BZG03C18TR3:

1.Submit a request within 90 days.

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

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