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Diodes Incorporated DDZ17-7
- Part No.:
- DDZ17-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ17-7.pdf
- Description:
- DIODE ZENER 17V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:56,652
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Product details
Overview
DDZ17-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 16.82–17.70 V at 10 mA test current, 23 Ω zener impedance at 10 mA, and ±5% tolerance on VZ, designed for voltage regulation and reference in low-power analog circuits such as power supply feedback loops and sensor biasing networks.
For engineers reviewing the DDZ17-7 datasheet, DDZ17-7 pinout, DDZ17-7 application, or DDZ17-7 equivalent, this device serves as a stable, RoHS-compliant, SOD123-packaged voltage reference where tight VZ tolerance, low dynamic impedance, and automotive-grade reliability (when qualified as DDZ17Q-7) are critical selection criteria.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its cathode–anode terminals. Its 10 mA zener test current and 23 Ω dynamic impedance at that point ensure predictable regulation under moderate load variations.
Thermal resistance of 425 °C/W (on minimal pad layout) and 266 °C/W (on 1 in² copper pad) defines its derating behavior; maximum power dissipation is 294 mW at 25 °C ambient under minimal PCB copper, dropping linearly above 75 °C ambient per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage Range | 16.82–17.70 V at IZT = 10 mA - defines usable regulation window for precision reference applications |
| Zener Impedance | 23 Ω at IZT = 10 mA - low dynamic resistance enables stable output under small-signal load transients |
| Max Reverse Current | 0.05 µA at VR = 14.0 V - ensures negligible leakage in standby or high-impedance sensing nodes |
| Power Dissipation | 294 mW at TA = 25 °C (minimal pad) - sets absolute upper limit for continuous operation without thermal runaway |
| Thermal Resistance | 425 °C/W (Junction-to-Ambient, minimal pad) - dictates required board copper area for safe thermal management |
| Operating Temp | −65 to +150 °C - supports industrial and automotive under-hood environments when qualified |
Pinout & Package
Package: SOD123 - surface-mount plastic package with cathode band marking; dimensions: L = 0.25–0.40 mm lead length, D = 1.40–1.70 mm body width, E = 2.55–2.85 mm body length, He = 3.55–3.85 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal | Connected to higher potential node; voltage regulation occurs across cathode-to-anode drop |
| Anode | Reference/ground terminal | Typically tied to system ground or low-side return path; establishes reference point for regulated output |
Key Features
| Feature | Design Value |
|---|---|
| Very tight VZ tolerance | ±5% over full operating temperature range - reduces need for post-production trimming in voltage reference designs |
| Low zener impedance | 23 Ω at 10 mA - minimizes output voltage variation under changing load currents in feedback networks |
| SOD123 packaging | 0.01 g weight, JEDEC-compliant footprint - enables high-density placement and compatibility with standard pick-and-place equipment |
| Lead-free & Green | <900 ppm Br/Cl, <1000 ppm Sb, UL 94V-0 rated - meets global environmental compliance requirements without performance trade-offs |
Applications
| Power Supply Feedback | Sensor Bias Reference |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Zener provides precise voltage threshold for optocoupler-based feedback loop. Use Value: Tight 16.82–17.70 V range matches common TL431 shunt regulator replacement needs while reducing component count. |
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) or bridge sensors. IC Role / Device Role / Timing Role: Acts as low-noise, low-drift voltage reference for ratiometric measurement circuits. Use Value: 23 Ω impedance and <0.05 µA leakage at 14 V ensure minimal sensor loading and long-term stability. |
| Overvoltage Clamp | Microcontroller Reset Circuit |
|
Use Scenario: Protecting I/O pins or ADC inputs from transient overvoltage events. IC Role / Device Role / Timing Role: Clamps voltage to ≤17.7 V during surge conditions, diverting excess current to ground. Use Value: Fast response in reverse breakdown and 294 mW power rating allow reliable single-pulse energy absorption up to ~100 mJ. |
Use Scenario: Generating clean reset signal for microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Forms part of RC-delayed reset circuit with precise turn-on threshold. Use Value: −65 to +150 °C operating range and low TC drift support robust reset behavior across extended temperature environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C16LT1G | 16.0–17.6 V range at 5 mA, 40 Ω ZZT, SOT-23 package | Higher impedance and lower test current reduce regulation accuracy in precision feedback loops | Select when SOT-23 footprint is mandatory and ±6% VZ tolerance is acceptable |
| MMSZ5246B | 16.0–17.6 V at 20 mA, 30 Ω ZZT, SOD-123 same package | Higher test current increases power demand; tighter thermal design needed for same regulation stability | Prefer when higher IZT improves noise immunity and existing designs use MMSZ5246B footprint |
Compared with DDZ17-7, BZX84-C16LT1G offers smaller footprint but sacrifices impedance and tolerance; MMSZ5246B matches package and voltage range but requires double the test current, affecting thermal margin and quiescent power in battery-powered systems.
Availability
DDZ17-7 is available at Aetrix Electronics and suitable for power supply feedback, sensor biasing, overvoltage clamping, and microcontroller reset circuits requiring stable component supply with consistent SOD123 packaging and tight zener voltage control.
Supply support for DDZ17-7 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, industry-standard components for power management, signal integrity, and protection.
The DDZ series belongs to Diodes' precision Zener diode product line, engineered for voltage reference and regulation in space-constrained, thermally demanding applications across industrial, computing, and automotive systems.
FAQ
What is the cathode identification method for DDZ17-7?
The cathode is marked by a visible band at one end of the SOD123 package body. When viewed from the top with the band on the left, the left terminal is cathode and the right is anode. This polarity must be observed in reverse-bias configuration for proper zener operation.
Does DDZ17-7 require external current limiting in typical applications?
Yes - a series current-limiting resistor is mandatory to set the operating zener current within 1–10 mA. For example, with 24 V input and target 10 mA IZ, a 720 Ω resistor yields ~17.2 V across the diode, staying within its specified 16.82–17.70 V range and 294 mW power limit.
Is DDZ17-7 suitable for automotive applications?
The commercial-grade DDZ17-7 is not AEC-Q101 qualified; however, the automotive variant DDZ17Q-7 shares identical electrical specs and is manufactured in IATF16949-certified facilities, PPAP-capable, and qualified for automotive use with enhanced change control and traceability.
How does temperature affect the zener voltage of DDZ17-7?
DDZ17-7 exhibits a positive temperature coefficient near +0.07 %/°C (per Fig. 18), meaning VZ increases ~12 mV/°C over its operating range. At 100 °C ambient, VZ rises approximately 0.7 V above its 25 °C value - a key consideration in high-temperature reference designs.
DDZ17-7 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 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
DDZ17-7 FAQ
1.How can I place an order for DDZ17-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ17-7 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 DDZ17-7 reliable?
The price and inventory of DDZ17-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ17-7 is usually 5 days.
3.What payment methods are accepted for DDZ17-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ17-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ17-7?
DDZ17-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ17-7 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 DDZ17-7?
For technical support, including DDZ17-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ17-7 requirements.
6.How does Aetrix verify that DDZ17-7 is sourced from the original manufacturer or authorized distributors?
All DDZ17-7 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 DDZ17-7 meets industry standards.
7.What is the process for return or replacement of DDZ17-7?
All DDZ17-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ17-7, 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 DDZ17-7 part is unused and in its original packaging.
Return procedure for DDZ17-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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