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Diodes Incorporated BZX84C18S-7
- Part No.:
- BZX84C18S-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Zener Diode Arrays
- Package:
- -
- Datasheet:
-
BZX84C18S-7.pdf
- Description:
- DIODE ZENER ARRAY 18V SOT363
- Quantity:
- Payment:
- Shipping:
Inventory:2,077
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Product details
Overview
BZX84C18S-7 from Diodes Incorporated is a dual 200 mW surface-mount Zener diode in SOT-363 package, rated for 18 V nominal Zener voltage (16.8–19.1 V range at 5 mA), with 45 Ω max Zener impedance at test current and 0.1 µA max reverse leakage at 12.6 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning and power rail regulation circuits.
For engineers reviewing the BZX84C18S-7 datasheet, BZX84C18S-7 pinout, BZX84C18S-7 application, or BZX84C18S-7 equivalent, key selection factors include its 18 V Zener tolerance, thermal resistance of 625 °C/W on FR4, ultra-small SOT-363 footprint, dual-diode configuration, and RoHS-compliant matte tin plating.
Technical Context
This device integrates two independent Zener diodes in a single SOT-363 package, sharing no internal connection-each diode operates as a discrete clamping or reference element. Its planar die construction ensures stable breakdown characteristics across temperature, with a Zener voltage temperature coefficient of +12.4 to +16.0 mV/°C at 5 mA.
The dual configuration enables compact dual-rail protection or matched reference pairs without board-level duplication. Thermal derating begins immediately above 25 °C ambient, reaching zero power dissipation at 150 °C per the published derating curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 18 V - precise DC reference or clamp level for 18 V rails or sensing thresholds |
| Zener Voltage Range | 16.8–19.1 V @ 5 mA - defines worst-case tolerance band for design margining |
| Zener Impedance | 45 Ω max @ 5 mA - determines output voltage stability under varying load current |
| Power Dissipation | 200 mW - limits continuous clamping energy in transient suppression applications |
| Reverse Leakage | 0.1 µA max @ 12.6 V - ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance | 625 °C/W - dictates junction temperature rise on standard FR4 PCB with recommended pad layout |
| Operating Temp | −65 to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: SOT-363 - ultra-small 6-pin surface-mount plastic case (2.2 mm × 1.3 mm × 0.9 mm), UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No Connect | Unbonded terminal; must remain unconnected to avoid parasitic coupling |
| C1 | Cathode of Diode 1 | Connected to cathode of first Zener; ties to regulated node or clamp target |
| A1 | Anode of Diode 1 | Connects to ground or lower-potential rail for forward-biased operation or reverse-biased Zener mode |
| A2 | Anode of Diode 2 | Independent anode for second Zener; enables dual-rail referencing or bidirectional clamping |
| C2 | Cathode of Diode 2 | Independent cathode path; allows separate voltage setting from Diode 1 |
| NC | No Connect | Second unconnected terminal; electrically isolated per mechanical drawing |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent Zeners | Two fully isolated 18 V Zener elements in one SOT-363 - saves board space vs. two discrete SOD-323 devices |
| Planar die construction | Ensures tight parametric distribution and repeatable breakdown voltage across production lots |
| Lead-free & RoHS compliant | Matte tin finish over Alloy 42 leadframe - meets global environmental compliance without solderability trade-offs |
| Low reverse leakage | ≤0.1 µA at 12.6 V - preserves accuracy in high-impedance feedback or sensing paths |
| Ultra-small footprint | SOT-363 package (2.2 × 1.3 mm) - enables dense layout in portable and space-constrained designs |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter front-end op-amps in harsh factory environments. IC Role / Device Role / Timing Role: Dual Zener provides matched 18 V reference for excitation and clamp for input protection stage. Use Value: Enables ±0.5% reference stability over −40 to +105 °C while occupying <1.5 mm² PCB area. | Use Scenario: Clamping VBUS transients during hot-plug events on embedded USB 2.0 host ports. IC Role / Device Role / Timing Role: One Zener clamps VBUS to 18 V; second protects D+ line against ESD-induced overshoot. Use Value: Dual-path protection meets IEC 61000-4-2 Level 4 (±15 kV air) without external TVS arrays. |
| Automotive Body Control Module (BCM) | Medical Wearable Battery Monitoring |
Use Scenario: Regulating 18 V supply for LIN transceiver bias in door module ECUs exposed to load dump pulses. IC Role / Device Role / Timing Role: Acts as shunt regulator and transient suppressor on 12 V–18 V derived rail. Use Value: Withstands 125 °C ambient and 200 mW pulse energy, eliminating need for larger DO-214AC parts. | Use Scenario: Providing accurate 18 V reference for ADC-based Li-ion cell voltage measurement in patch-style monitors. IC Role / Device Role / Timing Role: Reference diode sets full-scale threshold; low leakage prevents battery drain during sleep mode. Use Value: 0.1 µA leakage extends 7-day standby runtime by >12 hours versus standard 1N4746A alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5245BS-7-F | Single 18 V Zener, same SOT-363 package, 500 mW rating, higher leakage (1 µA @ 14 V) | Lacks dual-diode functionality; requires two units for dual-rail use | Select when higher power handling is needed and board space permits duplication |
| BZX84C18LT1G | Single 18 V Zener in SOT-23, 350 mW rating, tighter VZ tolerance (±5%), different thermal resistance (430 °C/W) | Not pin-compatible; no dual-diode option; smaller footprint but single function | Choose for cost-sensitive single-reference designs where SOT-23 placement is preferred |
Compared with MMBZ5245BS-7-F and BZX84C18LT1G, BZX84C18S-7 uniquely delivers dual 18 V Zeners in one SOT-363, enabling space-constrained dual-rail referencing or protection without layout duplication or thermal mismatch between discrete units.
Availability
BZX84C18S-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB port protection circuits, and automotive body control modules requiring stable component supply and long-term lifecycle continuity.
Supply support for BZX84C18S-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The BZX84C series belongs to Diodes' precision Zener diode product line, engineered for stable voltage reference and overvoltage protection in space-constrained, high-reliability applications across industrial and automotive markets.
FAQ
What is the maximum power dissipation for BZX84C18S-7 at 75°C ambient?
At 75°C ambient, the device's power dissipation is derated linearly from 200 mW at 25°C using the 625 °C/W thermal resistance. The allowable power is 200 mW × (1 − (75 − 25)/125) = 120 mW, per the published derating curve in DS30108 Rev. 17–2.
Are both Zener diodes in BZX84C18S-7 electrically isolated?
Yes - pins C1/A1 form one Zener diode and pins C2/A2 form the second; NC pins are unconnected. No internal connection exists between the two diodes, enabling fully independent operation in dual-rail or differential configurations.
Does BZX84C18S-7 meet AEC-Q200 stress testing requirements?
No - BZX84C18S-7 is not AEC-Q200 qualified. It is rated for −65 to +150 °C operating temperature and RoHS compliance, but lacks the extended reliability testing (e.g., temperature cycling, humidity bias) required for automotive qualification.
Can BZX84C18S-7 be used in place of a single 18 V Zener like BZX84C18LT1G?
Yes, but only one diode (C1/A1 or C2/A2) should be used; the second diode must be left unconnected. Pin compatibility differs: BZX84C18LT1G uses SOT-23 (3-pin), while BZX84C18S-7 uses SOT-363 (6-pin), requiring PCB redesign for direct substitution.
BZX84C18S-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Configuration:
- -
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
BZX84C18S-7 FAQ
1.How can I place an order for BZX84C18S-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C18S-7 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 BZX84C18S-7 reliable?
The price and inventory of BZX84C18S-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C18S-7 is usually 5 days.
3.What payment methods are accepted for BZX84C18S-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C18S-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C18S-7?
BZX84C18S-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C18S-7 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 BZX84C18S-7?
For technical support, including BZX84C18S-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C18S-7 requirements.
6.How does Aetrix verify that BZX84C18S-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C18S-7 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 BZX84C18S-7 meets industry standards.
7.What is the process for return or replacement of BZX84C18S-7?
All BZX84C18S-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C18S-7, 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 BZX84C18S-7 part is unused and in its original packaging.
Return procedure for BZX84C18S-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C18S-7 Tags
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