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Diodes Incorporated PD3Z284C18-7
- Part No.:
- PD3Z284C18-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- PowerDI™ 323
- Datasheet:
-
PD3Z284C18-7.pdf
- Description:
- DIODE ZENER 18V 500MW POWERDI323
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
PD3Z284C18-7 from Diodes Incorporated is a 18 V, 500 mW surface-mount Zener diode in PowerDI323 (Type B) package, with ±5% zener voltage tolerance (16.8–19.1 V), 20 Ω maximum zener impedance at 5 mA, and 0.1 µA maximum reverse leakage at 12.6 V. It delivers stable voltage regulation in low-power biasing and reference circuits for automotive ECUs and industrial sensors.
For engineers reviewing the PD3Z284C18-7 datasheet, PD3Z284C18-7 pinout, PD3Z284C18-7 application, or PD3Z284C18-7 equivalent, this device is selected for precision low-current voltage clamping, ESD-protected analog front-ends, and AEC-Q101-qualified power rail monitoring where thermal resistance of 250 °C/W and -65 to +150 °C operating range are critical.
Technical Context
This Zener diode uses planar die construction to ensure consistent breakdown characteristics and low temperature coefficient (±0.4 mV/°C typical at 18 V). Its ultra-small PowerDI323 (Type B) footprint supports high-density PCB layouts while maintaining 500 mW power dissipation under defined pad layout conditions.
Designed for stable DC voltage reference and overvoltage protection, it operates with 5 mA test current and exhibits 0.1 µA reverse leakage at 12.6 V - enabling low-quiescent-current designs. The cathode band polarity and matte tin–annealed copper leadframe ensure reliable solderability per MIL-STD-202.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 16.8–19.1 V range at 5 mA - defines precise clamping threshold for 12–24 V system rails |
| Power Dissipation | 500 mW - supports continuous regulation in compact, unheatsinked layouts |
| Zener Impedance (ZZT) | 20 Ω max at 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 0.1 µA max at 12.6 V - enables ultra-low standby current in battery-backed circuits |
| Thermal Resistance (RθJA) | 250 °C/W - requires controlled copper pour for sustained 500 mW operation |
| Operating Temperature | -65 to +150 °C - qualified for under-hood automotive and industrial environments |
| AEC-Q101 Qualified | Yes - validated for high-reliability automotive applications including engine control modules |
Pinout & Package
Package: PowerDI323 (Type B), ultra-small surface-mount plastic case with cathode band marking; dimensions: 2.50 × 1.25 × 0.65 mm (L × W × H); weight ≈ 0.005 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; connected to lower-potential node in Zener mode | Required for proper orientation in shunt regulation - reverse-biased connection places cathode at higher potential |
| Cathode | Current exit terminal during forward bias; connected to higher-potential node in Zener mode | Marked by visible band; must be tied to regulated rail or voltage reference point for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight VZ distribution and repeatable breakdown behavior across production lots |
| PowerDI323 (Type B) package | 0.005 g mass and 2.5 mm × 1.25 mm footprint enable placement in space-constrained modules like sensor transmitters |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock |
| Halogen- and antimony-free "Green" compound | Meets <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - compliant with global environmental directives beyond RoHS |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Current Loop Transmitter |
|---|---|
Use Scenario: Providing stable 18 V reference for microcontroller ADC biasing and sensor excitation in engine management systems. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply to analog signal chain components. Use Value: Maintains 0.4 mV/°C drift stability over -40 to +125 °C ambient, ensuring consistent sensor calibration accuracy. |
Use Scenario: Setting precise loop current threshold in 4–20 mA transmitter front-end using op-amp feedback. IC Role / Device Role / Timing Role: Zener-based voltage clamp defining upper limit of current-sense resistor voltage drop. Use Value: 20 Ω dynamic impedance minimizes error contribution (<0.1% full-scale) under varying loop load conditions. |
| Medical Portable Diagnostic Sensor Bias | Smart Building HVAC Controller Power Rail Clamp |
Use Scenario: Supplying low-noise bias voltage to MEMS pressure sensor amplifiers in battery-powered handheld devices. IC Role / Device Role / Timing Role: Low-leakage (0.1 µA) voltage reference enabling multi-year battery life in sleep mode. Use Value: Ultra-low IR prevents parasitic discharge of backup coin cell during extended idle periods. |
Use Scenario: Protecting 18 V DC input rail from transient overvoltage events in building automation controllers. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing surge energy before downstream regulators. Use Value: 500 mW rating sustains 100 ms transients without degradation, meeting IEC 61000-4-5 Level 3 immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C18,115 (Nexperia) | Same 18 V nominal, but 300 mW rating and 35 Ω ZZT; SOD323 package (slightly larger) | Limited to lower-power applications; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification and thermal performance needs |
| MMSZ5245B-TP (Micro Commercial Components) | 18 V nominal, 500 mW, but 30 Ω ZZT and no AEC-Q101 validation; SOD-123 package | Higher impedance increases regulation error under load; unsuitable for automotive Tier-1 designs | Acceptable for commercial-grade consumer electronics where qualification and tight VZ tolerance are non-critical |
Compared with BZX384-C18,115 and MMSZ5245B-TP, PD3Z284C18-7 offers superior thermal performance (250 °C/W vs. ≥300 °C/W), tighter zener impedance (20 Ω), and formal AEC-Q101 certification - making it the only choice for automotive and industrial applications demanding long-term reliability under thermal stress.
Availability
PD3Z284C18-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial current-loop transmitters, medical diagnostic sensors, and smart building HVAC controllers requiring stable component supply across extended product lifecycles.
Supply support for PD3Z284C18-7 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, specializing in high-reliability components for automotive, industrial, and computing markets.
PD3Z284C18-7 belongs to the PD3Z284C series of AEC-Q101-qualified Zener diodes designed specifically for voltage regulation and transient suppression in harsh-environment electronics where size, stability, and qualification matter.
FAQ
What is the maximum steady-state power dissipation for PD3Z284C18-7?
The PD3Z284C18-7 is rated for 500 mW power dissipation at 25 °C ambient when mounted on a polyimide PCB with Diodes Incorporated's recommended pad layout. Derating begins linearly above 25 °C at 2 mW/°C, reaching zero dissipation at 150 °C ambient.
Is PD3Z284C18-7 suitable for use in automotive applications?
Yes - PD3Z284C18-7 is fully qualified to AEC-Q101 standards, including temperature cycling, high-temperature operating life, and mechanical shock testing. It is approved for use in engine control modules, body electronics, and ADAS subsystems where reliability under thermal and vibration stress is mandatory.
How does the PowerDI323 (Type B) package differ from standard PowerDI323?
The PowerDI323 (Type B) package introduced in 2016 features refined mold compound geometry and optimized leadframe design for improved thermal transfer and mechanical robustness. Key differences include tighter dimensional tolerances (e.g., D = 2.40–2.60 mm vs. earlier 2.30–2.50 mm) and updated moisture sensitivity level (MSL 1).
What is the significance of the "-7" suffix in PD3Z284C18-7?
The "-7" suffix denotes tape-and-reel packaging: 3000 units per reel in PowerDI323 (Type B) format. It is not a revision code or electrical variant - all electrical specifications remain identical to the base PD3Z284C18 part number.
PD3Z284C18-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- PowerDI™ 323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±6%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 323
PD3Z284C18-7 FAQ
1.How can I place an order for PD3Z284C18-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for PD3Z284C18-7 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 PD3Z284C18-7 reliable?
The price and inventory of PD3Z284C18-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PD3Z284C18-7 is usually 5 days.
3.What payment methods are accepted for PD3Z284C18-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PD3Z284C18-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PD3Z284C18-7?
PD3Z284C18-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PD3Z284C18-7 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 PD3Z284C18-7?
For technical support, including PD3Z284C18-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PD3Z284C18-7 requirements.
6.How does Aetrix verify that PD3Z284C18-7 is sourced from the original manufacturer or authorized distributors?
All PD3Z284C18-7 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 PD3Z284C18-7 meets industry standards.
7.What is the process for return or replacement of PD3Z284C18-7?
All PD3Z284C18-7 units undergo pre-shipment inspection (PSI). If there is an issue with PD3Z284C18-7, 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 PD3Z284C18-7 part is unused and in its original packaging.
Return procedure for PD3Z284C18-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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