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Diodes Incorporated BZT52C12-7
- Part No.:
- BZT52C12-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C12-7.pdf
- Description:
- DIODE ZENER 12V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,309
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Product details
Overview
BZT52C12-7 from Diodes Incorporated is a surface-mount 12 V Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with ±5% zener voltage tolerance (11.4–12.7 V), 25 Ω maximum zener impedance at 5 mA, and 0.1 µA maximum reverse leakage at 9.0 V - used for precision voltage regulation and overvoltage protection in low-power DC rails.
For engineers reviewing the BZT52C12-7 datasheet, BZT52C12-7 pinout, BZT52C12-7 application, or BZT52C12-7 equivalent, key selection factors include its 12 V nominal breakdown voltage, thermal resistance of 338 °C/W (junction-to-ambient), AEC-Q101 qualification for automotive use, RoHS-compliant lead-free construction, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent electrical performance and reliability across production lots.
Designed for medium-current general-purpose regulation, it delivers 12 V regulation at 5 mA test current with ±5% tolerance, exhibits a positive temperature coefficient (+6.0 mV/°C), and supports operation from –65 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal, 11.4–12.7 V range at 5 mA - defines regulated output voltage under specified bias |
| Power Dissipation (PD) | 370 mW at +25°C ambient - sets max continuous power before thermal derating applies |
| Zener Impedance (ZZT) | 25 Ω max at 5 mA, 1 kHz - determines regulation stiffness against load current changes |
| Reverse Leakage (IR) | 0.1 µA max at 9.0 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Thermal Resistance (RθJA) | 338 °C/W - indicates required PCB copper area and layout for safe thermal management |
| Operating Temperature | –65 °C to +150 °C - enables deployment in industrial, automotive, and outdoor environments |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking, 0.010 g weight, UL 94V-0 flammability rating, and matte tin-plated alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated rail; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked by band; connected to higher-potential side; provides stable 12 V relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight parameter distribution and long-term stability of zener voltage and impedance |
| AEC-Q101 qualification | Validates reliability for automotive electronics including infotainment and body control modules |
| Lead-free & RoHS compliant | Meets global environmental directives without compromising solderability or thermal cycling performance |
| SOD123 footprint | Enables high-density PCB layouts and compatibility with standard 0805-class pick-and-place equipment |
Applications
| Power Supply Regulation | Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing 12 V bias rail for op-amps and comparators in industrial sensor interfaces. IC Role / Device Role / Timing Role: Voltage reference element providing fixed 12 V reference point for analog signal conditioning circuitry. Use Value: Maintains <±1% output variation across –40 °C to +85 °C ambient due to low tempco (+6.0 mV/°C) and stable ZZT. |
Use Scenario: Clamping transient spikes on 12 V CAN bus power lines in automotive ECUs. IC Role / Device Role / Timing Role: Shunt protection device diverting surge energy above 12.7 V to ground before downstream ICs are damaged. Use Value: Responds within nanoseconds to transients up to 500 mW peak power, with <0.1 µA leakage preserving battery life in sleep mode. |
| Reference Voltage Source | Signal Level Translation |
|
Use Scenario: Generating precise 12 V reference for ADC input scaling in data acquisition systems. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source feeding resistive divider networks for full-scale calibration. Use Value: Delivers 12 V ±0.65 V tolerance and 25 Ω dynamic impedance to minimize code error from source impedance mismatch. |
Use Scenario: Biasing logic-level translators between 3.3 V microcontrollers and 12 V automotive sensors. IC Role / Device Role / Timing Role: Provides stable 12 V pull-up reference for open-drain interface circuits. Use Value: Ensures clean high-state definition with <0.1 µA leakage, preventing false triggering in noise-prone vehicle harness environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B-7-F | Same 12 V nominal, but ±5% tolerance, 150 Ω ZZT, 500 mW PD, SOT-23 package | Larger package footprint; higher zener impedance reduces regulation accuracy under load variation | Select when SOT-23 is preferred for legacy board compatibility or higher thermal mass is needed |
| BZX84-C12 | 12 V nominal, ±5%, 25 Ω ZZT, 350 mW PD, SOT-23 package | Lower power rating limits sustained current handling; identical regulation performance at lower dissipation | Choose for cost-sensitive consumer designs where 350 mW suffices and SOT-23 placement is standardized |
Compared with MMBZ5242B-7-F and BZX84-C12, BZT52C12-7 offers superior thermal performance (338 °C/W vs. ~400 °C/W typical for SOT-23), tighter matching to automotive thermal profiles, and optimized SOD123 layout density - making it preferred for space-constrained, thermally demanding, or AEC-Q101–required applications.
Availability
BZT52C12-7 is available at Aetrix Electronics and suitable for automotive ECU power supervision, industrial sensor biasing, and embedded system voltage reference applications requiring stable component supply and AEC-Q101–qualified reliability.
Supply support for BZT52C12-7 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 BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-volume voltage regulation and protection in space-constrained surface-mount designs.
FAQ
What is the maximum continuous reverse current the BZT52C12-7 can handle at 12 V?
The BZT52C12-7 is not rated for continuous reverse current at its nominal zener voltage. At 12 V, it operates near breakdown; sustained current must be limited by external series resistance to stay within its 370 mW ambient-rated power dissipation. For example, at 12 V, max average current is ~30.8 mA (370 mW ÷ 12 V), assuming no self-heating beyond derating curves.
Is the BZT52C12-7 suitable for use in automotive applications?
Yes - the BZT52C12-7 is qualified to AEC-Q101 standards, has operating temperature range from –65 °C to +150 °C, and is manufactured with halogen- and antimony-free "Green" materials. It is explicitly listed in Diodes' automotive-grade ordering variants (e.g., BZT52C12Q-7-F), confirming suitability for under-hood and body-control module use.
How does the SOD123 package affect thermal performance compared to SOT-23?
The SOD123 package offers lower thermal resistance to ambient (338 °C/W) than typical SOT-23 Zeners (~400–450 °C/W) due to its larger copper pad exposure and shorter thermal path. When mounted per Diodes' recommended 1-inch² FR-4 copper pad, it sustains higher continuous power before derating - critical for compact automotive PCBs with limited heatsinking.
What is the significance of the "-7" suffix in BZT52C12-7?
The "-7" suffix denotes tape-and-reel packaging: 3,000 units per reel, compatible with standard SMT pick-and-place equipment. It also indicates commercial-grade qualification (non-automotive); for automotive use, the part number would be BZT52C12Q-7-F, where "Q" signals AEC-Q101 compliance and "F" confirms lead-free finish.
BZT52C12-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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
BZT52C12-7 FAQ
1.How can I place an order for BZT52C12-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C12-7 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 BZT52C12-7 reliable?
The price and inventory of BZT52C12-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C12-7 is usually 5 days.
3.What payment methods are accepted for BZT52C12-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C12-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C12-7?
BZT52C12-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C12-7 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 BZT52C12-7?
For technical support, including BZT52C12-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C12-7 requirements.
6.How does Aetrix verify that BZT52C12-7 is sourced from the original manufacturer or authorized distributors?
All BZT52C12-7 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 BZT52C12-7 meets industry standards.
7.What is the process for return or replacement of BZT52C12-7?
All BZT52C12-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C12-7, 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 BZT52C12-7 part is unused and in its original packaging.
Return procedure for BZT52C12-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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