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Diodes Incorporated DDZ33S-7
- Part No.:
- DDZ33S-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
DDZ33S-7.pdf
- Description:
- DIODE ZENER 33V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,300
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Product details
Overview
DDZ33S-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 33V (min 32.14V, max 33.79V), 5mA test current, 75Ω dynamic impedance at 2mA, 0.05µA reverse leakage at 27V, and 200mW power dissipation in SOD323 package. It provides stable voltage reference in low-power analog monitoring circuits.
For engineers reviewing the DDZ33S-7 datasheet, DDZ33S-7 pinout, DDZ33S-7 application, or DDZ33S-7 equivalent, this part supports precision voltage regulation, overvoltage clamping, and reference generation in space-constrained industrial sensor interfaces, battery management IC bias networks, and automotive body control module power supervision circuits.
Technical Context
This Zener diode operates in reverse breakdown mode with sharp knee characteristics and tight ±2.5% VZ tolerance at 25°C. Its low 75Ω zener impedance at 2mA ensures minimal output voltage variation under load changes.
Designed for high-reliability automated assembly, it features matte tin–annealed terminals solderable per MIL-STD-202, moisture sensitivity level 1, and UL 94V-0 molded plastic case. Thermal resistance is 625°C/W on FR-4 board with recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.14–33.79 V at IZT = 5 mA - defines stable regulation window for reference design |
| Zener Impedance (ZZT) | 75 Ω at IZ = 2 mA - determines output voltage stability under varying load current |
| Reverse Leakage (IR) | 0.05 µA at VR = 27 V - enables ultra-low quiescent current in battery-backed circuits |
| Power Dissipation (PD) | 200 mW - sets maximum continuous power handling in SOD323 footprint |
| Package | SOD323 - 1.30 mm × 1.70 mm surface-mount outline compatible with standard pick-and-place equipment |
| Temperature Coefficient | +0.06 %/°C typical near 33V - quantifies VZ drift over operating range (-65 to +150°C) |
Pinout & Package
DDZ33S-7 uses the SOD323 plastic package with cathode band marking. The device has two terminals: anode and cathode. Polarity is indicated by a visible cathode band on the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system GND or lowest potential point in regulation loop |
| Cathode | Zener output node | Provides regulated voltage; must be biased above anode by ≥32.14V to enter breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp breakdown knee | Enables precise turn-on behavior for clamping without soft saturation region |
| Tight VZ tolerance (±2.5%) | Reduces need for post-production trimming in voltage reference designs |
| Low leakage (0.05 µA @ 27V) | Minimizes error current in high-impedance feedback networks and battery-critical paths |
| SOD323 footprint compatibility | Supports high-density PCB layouts and automated reflow assembly without lead-free process concerns |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Power Supervision |
|---|---|
Use Scenario: Regulating reference voltage for 16-bit ADC front-end in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Precision voltage reference source for analog-to-digital conversion accuracy. Use Value: Maintains <±0.5 LSB error across -40°C to +85°C due to low TC and tight VZ tolerance. |
Use Scenario: Monitoring 12V battery rail against undervoltage/overvoltage thresholds in BCM microcontroller supply path. IC Role / Device Role / Timing Role: Analog comparator input reference for power fault detection logic. Use Value: Enables reliable 33V threshold detection with <1% total error including tempco and tolerance stack-up. |
| Portable Medical Device Battery Monitor | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Providing stable bias for lithium-ion cell voltage sensing circuit in handheld ECG monitor. IC Role / Device Role / Timing Role: Low-leakage reference for op-amp-based differential measurement amplifier. Use Value: Limits standby current contribution to <100nA, extending battery life beyond 72 hours per charge. |
Use Scenario: Clamping transient surges on 24V digital input channels of DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp protecting downstream optocoupler inputs. Use Value: Absorbs 100V/1µs transients without degradation, verified per IEC 61000-4-4 Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33 (ON Semiconductor) | 33V nominal, ±5% tolerance, 90Ω ZZT, SOT-23 package | Larger footprint; higher impedance increases regulation error in precision references | Preferred where SOT-23 board real estate is available and ±5% VZ is acceptable |
| MMSZ5257ET1G (onsemi) | 33V nominal, ±5% tolerance, 300mW PD, SOD-123 package | Higher power rating but looser tolerance and larger size limit use in miniaturized designs | Chosen when thermal margin >200mW is required and tighter VZ tolerance is not critical |
Compared with BZX84-C33 and MMSZ5257ET1G, DDZ33S-7 delivers superior voltage accuracy and lower dynamic impedance in the smallest footprint-making it optimal for space-constrained, high-precision analog reference nodes where thermal load remains below 200mW.
Availability
DDZ33S-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control module power supervision, and portable medical device battery monitoring requiring stable component supply and consistent parametric performance across production lots.
Supply support for DDZ33S-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, manufacturing, and sales operations across Asia, Europe, and North America.
The DDZ series is engineered specifically for high-accuracy, low-leakage voltage reference and clamping applications in compact, automated-assembly environments-targeting industrial, automotive, and portable electronics markets.
FAQ
What is the maximum continuous reverse voltage that can be safely applied to DDZ33S-7 without entering breakdown?
The device begins controlled breakdown at its minimum specified zener voltage of 32.14V. Applying reverse voltage below this value keeps it in non-conductive state. For safe non-breakdown operation, maintain reverse bias ≤32.14V at all temperatures and conditions. Exceeding this risks uncontrolled conduction and thermal runaway if power limits are breached.
Can DDZ33S-7 be used in series or parallel configurations for higher voltage or current capability?
Series connection is viable for higher reference voltages (e.g., two DDZ33S-7 yield ~66V), but requires matched units to avoid unequal voltage sharing. Parallel use is not recommended due to mismatched zener impedances causing current hogging and thermal instability. For higher current, use external series resistors or dedicated shunt regulators instead.
Does DDZ33S-7 meet automotive AEC-Q200 stress test requirements?
No-DDZ33S-7 is not AEC-Q200 qualified. It is rated for industrial temperature range (-65°C to +150°C) and RoHS-compliant, but lacks the extended reliability testing (temperature cycling, humidity bias, mechanical shock) required for automotive qualification. For AEC-Q200 applications, consider Diodes' AZ-series automotive-grade Zeners.
How does the 625°C/W thermal resistance impact PCB layout for DDZ33S-7 in continuous operation?
At 200mW dissipation, junction-to-ambient ΔT = 125°C-so ambient must stay ≤25°C for TJ ≤150°C. To reduce thermal rise, use ≥25 mm² copper pour connected to both terminals, avoid narrow traces, and ensure no heat-generating components are adjacent. Derate power linearly above 25°C ambient per Fig. 1 in DS30414.
DDZ33S-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±2.5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 75 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27 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-323
DDZ33S-7 FAQ
1.How can I place an order for DDZ33S-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ33S-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 DDZ33S-7 reliable?
The price and inventory of DDZ33S-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ33S-7 is usually 5 days.
3.What payment methods are accepted for DDZ33S-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ33S-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ33S-7?
DDZ33S-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ33S-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 DDZ33S-7?
For technical support, including DDZ33S-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ33S-7 requirements.
6.How does Aetrix verify that DDZ33S-7 is sourced from the original manufacturer or authorized distributors?
All DDZ33S-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 DDZ33S-7 meets industry standards.
7.What is the process for return or replacement of DDZ33S-7?
All DDZ33S-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ33S-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 DDZ33S-7 part is unused and in its original packaging.
Return procedure for DDZ33S-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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