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Diodes Incorporated UDZ12B-7
- Part No.:
- UDZ12B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
UDZ12B-7.pdf
- Description:
- DIODE ZENER 12V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,128
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Product details
Overview
UDZ12B-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 12.0 V (min 11.74 V, max 12.24 V), 200 mW power dissipation, 30 Ω zener impedance at 5 mA, and ±0.1 µA reverse leakage at 9.0 V. It is housed in an SOD323 package and qualified to AEC-Q101 for automotive-grade reliability. Used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the UDZ12B-7 datasheet, UDZ12B-7 pinout, UDZ12B-7 application, or UDZ12B-7 equivalent, key selection criteria include zener voltage tolerance (±2.1%), thermal resistance (625 °C/W), cathode-band polarity marking, and compliance with RoHS, halogen-free, and antimony-free "Green" requirements.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown with sharp knee characteristics and tightly controlled voltage tolerance. Its 5 mA test current and low dynamic impedance ensure stable regulation under light-load conditions.
Designed for surface-mount assembly on FR-4 PCBs using recommended pad layout, it features matte tin–annealed terminals solderable per MIL-STD-202 Method 208 and moisture sensitivity level 1 per J-STD-020D.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 11.74–12.24 V @ 5 mA - ensures ±2.1% regulation accuracy for 12 V reference designs |
| Power Dissipation | 200 mW - limits maximum continuous reverse power in ambient conditions |
| Zener Impedance | 30 Ω @ 5 mA - maintains low output impedance for stable reference under varying load |
| Reverse Leakage | 0.1 µA @ 9.0 V - minimizes quiescent current in high-impedance bias networks |
| Thermal Resistance | 625 °C/W - defines junction-to-ambient temperature rise per watt of dissipated power |
| Operating Temp | −65 to +150 °C - supports extended industrial and automotive under-hood environments |
| Package | SOD323 - 1.3 mm × 1.7 mm footprint enabling high-density PCB layouts |
Pinout & Package
Package: SOD323 - ultra-compact surface-mount plastic case with cathode band marking; dimensions: 1.30 mm (D) × 1.70 mm (E) × 0.30 mm (L); weight ≈ 0.004 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-bias regulation configuration |
| Cathode | Breakdown conduction terminal | Marked with band; connected to higher potential side to enable zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown knee | Enables precise voltage clamping with minimal transition region between conduction states |
| Tight voltage tolerance | ±2.1% zener voltage spread reduces need for post-production trimming in reference circuits |
| AEC-Q101 qualification | Validated for automotive applications including body control modules and sensor interfaces |
| Lead-free & Green compliant | Meets EU RoHS 2, contains <900 ppm Br/Cl and <1000 ppm Sb - suitable for eco-sensitive end markets |
Applications
| Automotive Sensor Reference | Industrial Analog Front-End |
|---|---|
Use Scenario: Providing stable 12 V reference for pressure or temperature sensor signal conditioning in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference for ADC biasing and op-amp feedback networks. Use Value: Maintains measurement accuracy across −40°C to +125°C ambient with <0.1 µA leakage at 9 V reverse bias. | Use Scenario: Regulating supply rail for low-power microcontrollers and interface ICs in programmable logic controllers. IC Role / Device Role / Timing Role: Low-power shunt regulator replacing linear regulators where current draw is <5 mA. Use Value: Delivers 200 mW dissipation capability in 1.3 mm × 1.7 mm footprint, reducing board area vs. larger packages. |
| Portable Medical Instrumentation | Consumer Power Management |
Use Scenario: Stabilizing reference voltage for battery-monitoring comparators in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-leakage zener element in voltage threshold detection circuitry. Use Value: Enables >10-year shelf life via 0.1 µA max reverse current at 9 V, minimizing standby drain. | Use Scenario: Overvoltage protection clamp for USB-powered accessories operating near 12 V input rails. IC Role / Device Role / Timing Role: Fast-response shunt protector triggered at 12.24 V breakdown limit. Use Value: Sharp breakdown characteristic ensures predictable clamping without overshoot during transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B12 | Same 12 V nominal rating but ±5% tolerance (vs. ±2.1%), 300 mW power rating | Higher power margin but looser voltage accuracy; not AEC-Q101 qualified | Select when cost sensitivity outweighs precision and automotive qualification needs |
| MMSZ4687T1G | 12 V nominal, ±5% tolerance, 500 mW rating, SOD-123 package (larger footprint) | Higher power handling and thermal mass; lacks AEC-Q101 and tighter tolerance | Prefer for non-automotive industrial use requiring robustness over compactness |
Compared with BZX384-B12 and MMSZ4687T1G, UDZ12B-7 offers superior voltage accuracy and automotive qualification in the smallest footprint-critical for space-constrained, high-reliability designs where regulation stability is prioritized over raw power headroom.
Availability
UDZ12B-7 is available at Aetrix Electronics and suitable for automotive sensor reference, industrial analog front-end, portable medical instrumentation, and consumer power management requiring stable component supply across production lifecycles.
Supply support for UDZ12B-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 UDZ series belongs to Diodes' precision Zener diode product line, engineered specifically for high-accuracy voltage reference and regulation in space-constrained, thermally demanding applications including automotive and industrial systems.
FAQ
What is the maximum reverse voltage that can be safely applied before breakdown?
The guaranteed breakdown occurs between 11.74 V and 12.24 V at 5 mA test current. Applying less than 9.0 V ensures reverse leakage remains ≤0.1 µA; exceeding 12.24 V risks uncontrolled conduction and thermal runaway if power dissipation exceeds 200 mW.
Is UDZ12B-7 suitable for use in high-frequency noise suppression?
No - this device is optimized for DC/low-frequency voltage regulation, not RF filtering. Its typical capacitance is ~2.5 pF at 0 V bias (per Fig. 6), too low for effective high-frequency bypass; use dedicated TVS or ceramic capacitors instead.
How does the SOD323 package affect thermal performance?
The SOD323's 625 °C/W junction-to-ambient thermal resistance assumes mounting on FR-4 with Diodes' recommended pad layout. Without copper pour or thermal vias, junction temperature rises rapidly above 100 mW - derating is required per Fig. 1 for reliable long-term operation.
Does UDZ12B-7 require external current limiting in series?
Yes - as a shunt regulator, it must be used with a series resistor to limit current to ≤5 mA for nominal regulation or ≤20 mA peak (within 200 mW limit). Omitting the resistor risks catastrophic failure due to uncontrolled power dissipation in breakdown mode.
UDZ12B-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):
- 12 V
- Tolerance:
- ±2%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 9 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
UDZ12B-7 FAQ
1.How can I place an order for UDZ12B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for UDZ12B-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 UDZ12B-7 reliable?
The price and inventory of UDZ12B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDZ12B-7 is usually 5 days.
3.What payment methods are accepted for UDZ12B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDZ12B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDZ12B-7?
UDZ12B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDZ12B-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 UDZ12B-7?
For technical support, including UDZ12B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDZ12B-7 requirements.
6.How does Aetrix verify that UDZ12B-7 is sourced from the original manufacturer or authorized distributors?
All UDZ12B-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 UDZ12B-7 meets industry standards.
7.What is the process for return or replacement of UDZ12B-7?
All UDZ12B-7 units undergo pre-shipment inspection (PSI). If there is an issue with UDZ12B-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 UDZ12B-7 part is unused and in its original packaging.
Return procedure for UDZ12B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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