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Diodes Incorporated BZX84C12-7
- Part No.:
- BZX84C12-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C12-7.pdf
- Description:
- DIODE ZENER 12V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,943
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Product details
Overview
BZX84C12-7 from Diodes Incorporated is a 350mW surface-mount Zener diode with nominal zener voltage 12V (11.4–12.7V range at 5mA), 25Ω maximum zener impedance at test current, and ±0.1µA maximum reverse leakage at 8V. It uses planar die construction in SOT23 package and is AEC-Q101 qualified for automotive power rail stabilization.
For engineers reviewing the BZX84C12-7 datasheet, BZX84C12-7 pinout, BZX84C12-7 application, or BZX84C12-7 equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at regulation current, thermal resistance (357°C/W), and automotive qualification status - all critical for precision voltage reference and overvoltage clamp design in space-constrained PCBs.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across load variations, with specified test current of 5mA and temperature coefficient of +6.0mV/°C. Its low 25Ω zener impedance ensures minimal output voltage deviation under dynamic current loads.
The device exhibits 0.1µA reverse leakage at VR = 8V and forward voltage of 0.9V at IF = 10mA. Thermal resistance of 357°C/W (junction-to-ambient, terminals held at ambient) defines its derating behavior above 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12V nominal (11.4–12.7V range at 5mA); defines precise clamping threshold for 12V rail protection |
| Power Dissipation | 350mW at TA = 25°C; sets maximum continuous power handling before thermal shutdown |
| Zener Impedance (ZZT) | 25Ω max at IZT = 5mA; determines regulation stiffness against load transients |
| Reverse Leakage (IR) | 0.1µA max at VR = 8V; ensures negligible standby current in high-impedance bias networks |
| Temperature Coefficient | +6.0mV/°C; quantifies voltage drift per degree rise - critical for temperature-stable references |
| Package | SOT23; enables automated pick-and-place assembly and fits ≤1.0mm pitch layouts |
| AEC-Q101 Qualified | Yes; validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SOT23 - three-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground or lower-potential node during Zener operation |
| Cathode (Pin 2) | Zener regulation terminal / voltage reference output | Provides stabilized 12V output when reverse-biased; connects to supply rail or feedback node |
| No-Connect (Pin 3) | Internal die attach pad (non-functional) | Thermally conductive but electrically isolated; used for mechanical anchoring only |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance control and repeatable breakdown characteristics across production lots |
| 350mW power rating | Supports sustained clamping in 12V automotive subsystems without external heatsinking |
| AEC-Q101 qualification | Validates performance across -40°C to +125°C operating range and lifetime reliability for automotive ECUs |
| Lead-free & halogen-free | Meets RoHS 3 and automotive green standards (<900ppm Br+Cl, <1000ppm Sb), enabling global compliance |
| SOT23 footprint | Reduces board area by >60% vs. DO-35; compatible with standard 0.65mm pitch reflow profiles |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 12V microcontroller supply rail in door module electronics exposed to load dump transients. IC Role / Device Role: Primary overvoltage clamp and reference stabilizer for LDO input stage. Use Value: Limits rail excursion to ≤13.5V during ISO 7637-2 Pulse 5a events while drawing <0.1µA quiescent current. |
Use Scenario: Providing precise 12V reference for 16-bit ADC biasing in factory-floor pressure transmitters. IC Role / Device Role: Low-drift voltage reference source for ratiometric sensor excitation. Use Value: Delivers ±0.8% VZ stability over -40°C to +85°C, reducing ADC gain error by 1.2 LSB. |
| Consumer Power Adapter Feedback Loop | Medical Infusion Pump Power Monitoring |
Use Scenario: Secondary-side voltage sensing in flyback converter feedback network for USB-C PD adapters. IC Role / Device Role: Zener-based shunt regulator setting optocoupler LED current threshold. Use Value: Maintains 1.5% output regulation accuracy across 10–100% load with 25Ω dynamic impedance. |
Use Scenario: Overvoltage detection on 12V battery backup line in Class II medical infusion controllers. IC Role / Device Role: Fail-safe clamp preventing >13.2V exposure to MCU GPIOs during charging anomalies. Use Value: Triggers hardware reset within 120ns at 12.8V, meeting IEC 62304 safety requirement C.2.3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B-7-F | Zener voltage 12V (11.4–12.6V), 200mW rating, 30Ω ZZT, no AEC-Q101 qualification | Limited to commercial temperature range (-55°C to +150°C not validated); unsuitable for automotive under-hood use | Select when cost sensitivity outweighs automotive qualification and higher power margin is unnecessary |
| BZX84-C12,115 | Identical electrical specs, same SOT23 package, but supplied in 10,000-piece tape-and-reel (13-F suffix) and non-automotive marking | No functional difference; differs only in packaging quantity and traceability labeling per JEDEC J-STD-020 | Choose for high-volume industrial manufacturing where reel size impacts SMT line efficiency |
Compared with MMBZ5242B-7-F, BZX84C12-7 offers 75% higher power margin and automotive qualification; versus BZX84-C12,115, it provides identical performance with optimized 3,000-piece reel for prototyping and low-volume builds.
Availability
BZX84C12-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and consumer power adapter feedback loops requiring stable component supply with full traceability and AEC-Q101 compliance.
Supply support for BZX84C12-7 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 centers across Asia and manufacturing in China and Malaysia.
The BZX84 series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage regulation and transient suppression in automotive, industrial, and consumer power systems where compact size and reliability are mandatory.
FAQ
What is the maximum allowable junction temperature for BZX84C12-7?
The absolute maximum junction temperature is +150°C, with continuous operation limited to +125°C for automotive applications per AEC-Q101 stress testing requirements. Derating begins linearly at 357°C/W above 25°C ambient, reaching zero power at +125°C ambient for unrestricted mounting conditions.
Does BZX84C12-7 support bidirectional ESD protection?
No - BZX84C12-7 is a unidirectional Zener diode optimized for reverse-bias voltage regulation. It lacks symmetric breakdown characteristics and is not rated for IEC 61000-4-2 ESD immunity. For bidirectional protection, Diodes Incorporated recommends the D3V3M1U2S series TVS diodes.
How does the +6.0mV/°C temperature coefficient affect long-term voltage reference stability?
The +6.0mV/°C coefficient causes ~72mV drift over a 120°C range (−40°C to +80°C), translating to ±0.6% full-scale error in a 12V reference. For sub-0.1% stability, external compensation or selection of lower-TC variants like BZX84C10 (±0.4%) is required.
Can BZX84C12-7 be used in place of a 12V Zener with 1N4742A footprint?
No - the 1N4742A uses DO-41 through-hole package (5.2mm length, 2.7mm diameter) and 1W power rating, while BZX84C12-7 is SOT23 (2.9mm × 1.3mm) with 350mW rating. Direct replacement requires PCB redesign, thermal analysis, and verification of current-limiting resistor values due to differing power handling.
BZX84C12-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 300 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:
- SOT-23-3
BZX84C12-7 FAQ
1.How can I place an order for BZX84C12-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C12-7 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 BZX84C12-7 reliable?
The price and inventory of BZX84C12-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C12-7 is usually 5 days.
3.What payment methods are accepted for BZX84C12-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C12-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C12-7?
BZX84C12-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C12-7 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 BZX84C12-7?
For technical support, including BZX84C12-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C12-7 requirements.
6.How does Aetrix verify that BZX84C12-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C12-7 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 BZX84C12-7 meets industry standards.
7.What is the process for return or replacement of BZX84C12-7?
All BZX84C12-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C12-7, 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 BZX84C12-7 part is unused and in its original packaging.
Return procedure for BZX84C12-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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