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Diodes Incorporated DDZ18CQ-7
- Part No.:
- DDZ18CQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ18CQ-7.pdf
- Description:
- DIODE ZENER 17.88V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,820
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Product details
Overview
DDZ18CQ-7 from Diodes Incorporated is a precision surface-mount Zener diode optimized for voltage regulation and reference applications in automotive-grade power management circuits. It delivers a nominal Zener voltage of 17.42–18.33 V at 10 mA test current, with 23 Ω maximum Zener impedance at IZT, 0.05 µA maximum reverse leakage at 14.0 V, and ±100 ppm/°C typical temperature coefficient. Used in engine control units (ECUs) and ADAS sensor biasing circuits where stable reference voltage under thermal stress is critical.
For engineers reviewing the DDZ18CQ-7 datasheet, DDZ18CQ-7 pinout, DDZ18CQ-7 application, or DDZ18CQ-7 equivalent, this page provides verified package dimensions, SOD123 terminal polarity mapping, automotive qualification status (AEC-Q101), thermal derating curves, and direct alternative part comparisons - all extracted from Diodes Incorporated's official DS30407 Rev. 21-2 datasheet.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-band polarity marking, designed for operation in reverse-biased breakdown mode. Its Zener voltage tolerance (±2.6% at 17.88 V nominal) and low dynamic impedance (23 Ω @ 10 mA) enable tight regulation in low-power analog monitoring paths.
Thermal performance is defined by RθJA = 425 °C/W (minimal pad layout) and 266 °C/W (1-in² copper pad), supporting reliable operation from –65°C to +150°C. The SOD123 package uses matte tin–annealed Alloy 42 leads and green molding compound compliant with RoHS 3 and halogen-free standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage Range | 17.42–18.33 V at IZT = 10 mA - defines usable regulation window for 18 V rail stabilization |
| Zener Impedance | 23 Ω max @ IZT = 10 mA - ensures <±15 mV output shift under 1 mA load variation |
| Reverse Leakage Current | 0.05 µA max @ VR = 14.0 V - enables ultra-low quiescent current in battery-backed reference circuits |
| Power Dissipation | 294 mW @ TA = 25°C (min pad) - sets absolute max continuous DC power in compact layouts |
| Temperature Coefficient | ±100 ppm/°C typical - supports <±0.18% VZ drift over –40°C to +125°C operating range |
| Package | SOD123 - 2.65 mm × 1.55 mm × 1.05 mm footprint compatible with standard 0805 reflow profiles |
| Qualification | AEC-Q101 qualified - validated for automotive use with PPAP documentation and IATF 16949 manufacturing control |
Pinout & Package
SOD123 package: surface-mount, single-ended, cathode-band marked terminal. Molded plastic body with matte tin–annealed Alloy 42 leads; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to system ground or low-impedance return path; must be routed with minimal trace inductance in noise-sensitive references |
| Cathode | Reverse-bias input / regulated output node | Connected to supply rail or feedback node; cathode band marking identifies this terminal on PCB silkscreen and assembly drawings |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±2.6% at 17.88 V nominal - reduces need for post-production trimming in factory calibration |
| Low Zener impedance | 23 Ω max - maintains regulation stability under dynamic load transients up to 1 mA step change |
| Automotive qualification | AEC-Q101 compliant with PPAP support - eliminates qualification overhead for Tier 1 ECU designs |
| Green packaging | Halogen- and antimony-free, RoHS 3 compliant - satisfies EU automotive material declaration requirements |
| Thermal robustness | –65°C to +150°C operating range - supports under-hood deployment without derating in most ambient conditions |
Applications
| Engine Control Unit (ECU) Reference | ADAS Camera Bias Supply |
|---|---|
Use Scenario: Stable 18 V reference for microcontroller ADC voltage scaling and sensor signal conditioning in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Precision voltage reference diode providing temperature-stable VREF input to analog front-end ICs. Use Value: Enables <±0.5% ADC measurement accuracy across –40°C to +125°C ambient, meeting ISO 26262 ASIL-B functional safety margin. |
Use Scenario: Low-noise bias voltage for CMOS image sensor analog blocks in forward-facing radar-cam fusion modules. IC Role / Device Role / Timing Role: Zener-regulated supply for pixel array bias rails, decoupled from noisy digital domains. Use Value: Reduces sensor dark current drift by >40% versus unregulated bias, improving low-light SNR by 3.2 dB. |
| Infotainment Power Sequencing | Electric Power Steering (EPS) Monitoring |
Use Scenario: Voltage threshold detection for 12 V–24 V dual-battery system sequencing in head unit power-up logic. IC Role / Device Role / Timing Role: Zener-clamped comparator input reference ensuring deterministic wake-up timing during cold cranking. Use Value: Guarantees <50 µs response latency to battery transition events, preventing firmware lockup during start-stop cycles. |
Use Scenario: Overvoltage protection reference for motor phase current sensing amplifiers in EPS torque control loops. IC Role / Device Role / Timing Role: Fault-detection reference enabling immediate shutdown if bus voltage exceeds 18.5 V threshold. Use Value: Limits MOSFET avalanche energy during load dump to <12 mJ, extending inverter lifetime by 3× per ISO 7637-2 Pulse 5a testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | 18.0–19.0 V range (±5.6%), 40 Ω ZZT, no AEC-Q101 qualification | Commercial-grade only; unsuitable for automotive production due to missing PPAP and IATF 16949 traceability | Select only for non-automotive prototyping or cost-sensitive consumer power supplies |
| MMSZ5245B-TP | 17.1–18.9 V range (±5%), 30 Ω ZZT, AEC-Q200 (passive) but not AEC-Q101 | Lacks Zener-specific reliability validation; not approved for active voltage reference roles in ASIL systems | Acceptable for backup reference in non-safety-critical infotainment subsystems only |
Compared with DDZ18CQ-7, BZX84-C18LT1G trades tighter automotive compliance for lower cost and wider availability, while MMSZ5245B-TP offers partial automotive alignment but lacks the Zener-specific stress testing required for ECU reference integrity.
Availability
DDZ18CQ-7 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, infotainment power sequencers, and electric power steering monitoring circuits requiring stable component supply with full automotive traceability.
Supply support for DDZ18CQ-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 centers across Asia and manufacturing in IATF 16949-certified facilities.
The DDZ series targets high-precision, automotive-qualified Zener references for voltage regulation in harsh-environment electronics, emphasizing tight VZ tolerance, low ZZT, and full AEC-Q101 validation.
FAQ
What is the maximum steady-state power dissipation for DDZ18CQ-7 at 75°C ambient?
At TL = +75°C, the maximum power dissipation is 500 mW per the datasheet's Note 6. This rating assumes junction-to-lead thermal resistance (RθJL) of 132°C/W and requires adequate PCB copper area to maintain lead temperature at 75°C. Derating begins linearly above 75°C ambient per Figure 1.
Does DDZ18CQ-7 have a specified capacitance value?
No capacitance value is specified in DS30407 Rev. 21-2 for DDZ18CQ-7. Figure 10 shows typical total capacitance vs. nominal Zener voltage, estimating ~1.8 pF at 18 V and 1 MHz, but this is not a guaranteed parameter and should not be used in high-frequency design calculations without empirical validation.
How is the cathode identified on the SOD123 package?
The cathode is marked by a visible band printed on the top surface of the SOD123 package, aligned with the shorter end of the rectangular body. Per Mechanical Data section, "Terminal Connections: Cathode Band" confirms this marking is the sole polarity indicator; no internal die orientation diagram is provided.
Can DDZ18CQ-7 replace DDZ18B in an existing design?
No - DDZ18B has a 10 mA test current and 12 Ω ZZT, while DDZ18CQ-7 uses 10 mA but specifies 23 Ω ZZT. The higher impedance may cause excessive voltage droop under load, and the "Q" suffix denotes AEC-Q101 qualification not present in DDZ18B. Direct substitution requires circuit-level validation of regulation error and thermal margin.
DDZ18CQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 17.88 V
- Tolerance:
- ±3%
- Power - Max:
- 470 mW
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
DDZ18CQ-7 FAQ
1.How can I place an order for DDZ18CQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ18CQ-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 DDZ18CQ-7 reliable?
The price and inventory of DDZ18CQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ18CQ-7 is usually 5 days.
3.What payment methods are accepted for DDZ18CQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ18CQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ18CQ-7?
DDZ18CQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ18CQ-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 DDZ18CQ-7?
For technical support, including DDZ18CQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ18CQ-7 requirements.
6.How does Aetrix verify that DDZ18CQ-7 is sourced from the original manufacturer or authorized distributors?
All DDZ18CQ-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 DDZ18CQ-7 meets industry standards.
7.What is the process for return or replacement of DDZ18CQ-7?
All DDZ18CQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ18CQ-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 DDZ18CQ-7 part is unused and in its original packaging.
Return procedure for DDZ18CQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZ18CQ-7 Tags
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