My Inquiry
My Account
Diodes Incorporated DDZ31Q-7
- Part No.:
- DDZ31Q-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
DDZ31Q-7.pdf
- Description:
- DIODE ZENER 31.1V 470MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,317
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DDZ31Q-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage of 31.0 V (min 30.32 V, max 31.88 V), 5 mA test current, 65 Ω zener impedance at IZT, 0.05 µA reverse leakage at 25.0 V, and ±5% voltage tolerance. It operates in SOD123 package, delivers stable voltage reference in power supply feedback loops and overvoltage protection circuits for industrial DC-DC converters.
For engineers reviewing the DDZ31Q-7 datasheet, DDZ31Q-7 pinout, DDZ31Q-7 application, or DDZ31Q-7 equivalent, this page provides verified electrical parameters, thermal derating behavior, temperature coefficient data, automotive qualification status (AEC-Q101), and real-world design context for voltage reference selection in space-constrained, high-reliability systems.
Technical Context
This Zener diode functions as a two-terminal voltage reference device, operating in reverse breakdown mode with tightly controlled VZ tolerance (±5%) and low dynamic impedance (65 Ω @ 5 mA). Its 0.05 µA reverse current at 25 V ensures minimal standby power loss in bias networks.
Designed for stable operation across –65°C to +150°C, it exhibits a positive temperature coefficient (~0.09%/°C at 31 V) per Figure 19, enabling predictable drift compensation in analog sensing front-ends and regulated power supplies where thermal stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30.32 V to 31.88 V @ IZT = 5 mA - defines precise regulation window for feedback node referencing |
| Zener Impedance (ZZT) | 65 Ω @ 5 mA - determines output voltage ripple rejection under load transients |
| Reverse Leakage (IR) | 0.05 µA @ VR = 25 V - enables ultra-low quiescent current in battery-backed monitoring circuits |
| Power Dissipation (PD) | 294 mW @ TA = 25°C (Note 8) - sets maximum continuous power handling on standard FR-4 PCB with minimal copper |
| Thermal Resistance (RθJA) | 425 °C/W - indicates sensitivity to ambient temperature rise; requires thermal pad layout per recommended footprint |
| Temperature Coefficient | +0.09 %/°C (typ.) - quantifies VZ drift magnitude over industrial temperature range |
| Package | SOD123 - 2.65 mm × 1.55 mm surface-mount outline compatible with automated pick-and-place and reflow |
Pinout & Package
SOD123 package: cathode-indicated by band-marked end; anode at opposite terminal; molded green plastic body (UL 94V-0), matte tin-plated alloy 42 leadframe, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Breakdown voltage reference node | Connected to regulated output or error amplifier inverter input; carries reverse current during regulation |
| Anode | Reference ground return path | Provides low-impedance return to system ground or feedback divider common; must be routed with minimal inductance |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% (30.32–31.88 V) - reduces need for external trimming in mid-voltage reference designs |
| Low zener impedance | 65 Ω @ 5 mA - improves line/load regulation in switching regulator feedback paths |
| AEC-Q101 qualified | Qualified for automotive applications with PPAP support and IATF16949 manufacturing - enables use in ADAS power rails and infotainment subsystems |
| Green, halogen-free construction | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets global environmental compliance mandates without performance trade-offs |
| Thermal stability | Operates continuously from –65°C to +150°C - supports deployment in under-hood and industrial control environments |
Applications
| Industrial Power Supply Feedback | Automotive Overvoltage Clamp |
|---|---|
|
Use Scenario: Regulating output voltage of isolated flyback converter in PLC power module. IC Role / Device Role / Timing Role: Zener diode serves as secondary-side voltage reference for TL431-based optocoupler feedback loop. Use Value: Tight 5% VZ tolerance eliminates need for resistor trimming; 65 Ω ZZT maintains ±1.5% output regulation across 10–100% load step. |
Use Scenario: Protecting 24 V CAN transceiver input against load-dump surges up to 40 V. IC Role / Device Role / Timing Role: Shunt clamp placed between VCC rail and ground, triggered above 31 V threshold. Use Value: 0.05 µA leakage at 25 V prevents false triggering; 294 mW rating sustains 100 ms surge without thermal runaway. |
| Medical Sensor Bias Reference | Test Equipment Calibration Node |
|
Use Scenario: Providing stable 31 V bias for photodiode transimpedance amplifier in portable blood oximeter. IC Role / Device Role / Timing Role: Precision voltage source setting op-amp common-mode input level and gain-setting network. Use Value: +0.09%/°C TC allows predictable offset correction in firmware; SOD123 footprint fits within 8 mm² board area constraint. |
Use Scenario: Serving as traceable voltage reference in handheld multimeter internal calibration circuitry. IC Role / Device Role / Timing Role: Primary shunt reference for ADC reference buffer stage during factory calibration. Use Value: Verified ±5% initial accuracy and <100 ppm/°C drift enable 0.1% measurement repeatability across 15–35°C lab environment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | 30 V nominal, ±5%, 90 Ω ZZT @ 5 mA, SOT-23 package | Higher impedance limits regulation accuracy in high-bandwidth feedback; smaller SOT-23 footprint reduces thermal mass | Select when board space is constrained and ±2% regulation suffices; avoid in high-transient-load scenarios |
| MMSZ5256B-TP | 30 V nominal, ±5%, 30 Ω ZZT @ 20 mA, SOD-123 package | Lower impedance but requires 20 mA test current - increases quiescent power by 4× vs. DDZ31Q-7's 5 mA | Prefer for low-noise analog references where power budget allows; not suitable for ultra-low-power sensor nodes |
Compared with BZX84-C30LT1G and MMSZ5256B-TP, DDZ31Q-7 uniquely balances low leakage (0.05 µA), moderate impedance (65 Ω), and AEC-Q101 qualification - making it optimal for automotive and industrial applications demanding reliability, efficiency, and regulatory compliance in one package.
Availability
DDZ31Q-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, medical instrumentation, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for DDZ31Q-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.
The DDZ series targets precision voltage reference needs in space-constrained, thermally demanding applications - emphasizing tight VZ tolerance, low leakage, and AEC-Q101 qualification for mission-critical systems.
FAQ
What is the maximum continuous power dissipation for DDZ31Q-7 on a standard FR-4 PCB?
DDZ31Q-7 dissipates up to 294 mW at 25°C ambient when mounted on a single-sided FR-4 board with minimum recommended pad layout (per Note 8). Derating begins linearly above 25°C at 0.706 mW/°C, reaching zero at 150°C ambient.
Is DDZ31Q-7 suitable for automotive applications?
Yes - DDZ31Q-7 is AEC-Q101 qualified, PPAP capable, and manufactured in IATF16949-certified facilities. Its SOD123 package, –65°C to +150°C operating range, and green material composition meet automotive electronics requirements for under-hood and cabin modules.
How does the temperature coefficient affect voltage stability in a 31 V reference design?
At ~+0.09%/°C, DDZ31Q-7 exhibits a +28 mV/°C drift near room temperature. Over a 100°C span (–40°C to +60°C), this yields ~2.8 V total shift - acceptable for non-critical biasing but requires compensation in high-accuracy metering applications.
What is the recommended PCB pad layout for optimal thermal performance?
Use the Diodes-recommended SOD123 footprint: X = 0.900 mm, X1 = 4.050 mm, Y = 0.950 mm. For thermal improvement, extend copper beyond pads using thermal spokes to inner ground planes - increasing effective RθJA margin by up to 30% versus minimum layout.
DDZ31Q-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):
- 31.1 V
- Tolerance:
- ±3%
- Power - Max:
- 470 mW
- Impedance (Max) (Zzt):
- 65 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 25 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
DDZ31Q-7 FAQ
1.How can I place an order for DDZ31Q-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZ31Q-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 DDZ31Q-7 reliable?
The price and inventory of DDZ31Q-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZ31Q-7 is usually 5 days.
3.What payment methods are accepted for DDZ31Q-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZ31Q-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZ31Q-7?
DDZ31Q-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZ31Q-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 DDZ31Q-7?
For technical support, including DDZ31Q-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZ31Q-7 requirements.
6.How does Aetrix verify that DDZ31Q-7 is sourced from the original manufacturer or authorized distributors?
All DDZ31Q-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 DDZ31Q-7 meets industry standards.
7.What is the process for return or replacement of DDZ31Q-7?
All DDZ31Q-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZ31Q-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 DDZ31Q-7 part is unused and in its original packaging.
Return procedure for DDZ31Q-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZ31Q-7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
