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Diodes Incorporated BZX84C33Q-7-F
- Part No.:
- BZX84C33Q-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C33Q-7-F.pdf
- Description:
- DIODE ZENER 33V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZX84C33Q-7-F from Diodes Incorporated is an automotive-grade 33V Zener diode in SOT23 package, rated for 350mW power dissipation, ±3.0V zener voltage tolerance (31.0–35.0V @ 2mA), and 325Ω maximum zener impedance at test current. It provides precise voltage regulation in low-power biasing and overvoltage protection circuits for engine control units and body electronics.
For engineers reviewing the BZX84C33Q-7-F datasheet, BZX84C33Q-7-F pinout, BZX84C33Q-7-F application, or BZX84C33Q-7-F equivalent, key selection criteria include zener voltage accuracy at low test current (2mA), thermal resistance (357°C/W), AEC-Q101 qualification, and automotive tape-and-reel packaging (3,000 pcs/reel).
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and long-term stability, with a nominal temperature coefficient of +23.1 mV/°C - indicating positive drift above 25°C.
The device is optimized for surface-mount automated assembly and meets stringent automotive reliability requirements. Its 0.008g weight, UL 94V-0 molded plastic case, and matte tin-plated Alloy 42 leadframe support high-volume manufacturing and solderability per MIL-STD-202.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33V nominal, 31.0–35.0V range @ IZT = 2mA - defines regulation window for precision reference use |
| Power Dissipation | 350mW at ambient temperature - sets maximum continuous power handling without heatsinking |
| Zener Impedance (ZZT) | ≤325Ω @ IZT = 2mA - determines regulation stiffness and AC ripple rejection capability |
| Reverse Current (IR) | ≤0.1µA @ VR = 27.4V - ensures minimal leakage in high-impedance bias networks |
| Temperature Coefficient | +23.1 mV/°C - quantifies voltage drift per degree rise above 25°C for thermal design margining |
| Thermal Resistance (RθJA) | 357°C/W - enables junction temperature estimation under real PCB layout conditions |
Pinout & Package
Package: SOT23 - surface-mount, 3-terminal plastic package with 0.915mm terminal width, 2.40mm body length, and 1.30mm body width; compliant with JEDEC TO-236AB outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction path / cathode reference return | Connected to lower-potential node in reverse-biased configuration; required for proper biasing in shunt regulator topologies |
| Cathode (Pin 2) | Zener breakdown terminal / voltage reference output | Provides regulated voltage node when reverse-biased; must be held at higher potential than anode by ≥33V to enter regulation |
| NC / Dummy (Pin 3) | Non-connected internal tie bar | Structural support only; electrically isolated and must not be connected in circuit layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, lighting, and infotainment systems |
| Green molding compound | Halogen- and antimony-free (<900ppm Br+Cl, <1000ppm Sb) - supports environmental compliance and RoHS 3 |
| Matte tin lead finish | Solderable per MIL-STD-202, Method 208 - ensures reliable reflow and wave solder joint formation |
| Moisture sensitivity Level 1 | No bake requirement before SMT assembly - reduces manufacturing overhead and floor life constraints |
Applications
| Engine Control Unit (ECU) Reference | Automotive LED Driver Biasing |
|---|---|
Use Scenario: Stable 33V reference for microcontroller ADC calibration and sensor signal conditioning in under-hood environments. IC Role / Device Role / Timing Role: Shunt voltage reference providing temperature-compensated bias point for analog front-end circuitry. Use Value: Maintains ≤±3V regulation window across -40°C to +125°C, enabling accurate sensor readings despite thermal cycling. |
Use Scenario: Setting constant-current threshold in linear LED driver ICs for interior lighting modules. IC Role / Device Role / Timing Role: Precision voltage clamp defining current-sense amplifier trip point. Use Value: Low 0.1µA leakage at 27.4V ensures minimal error in current-setting resistor network under standby conditions. |
| Body Control Module (BCM) Overvoltage Protection | Infotainment Power Supply Clamp |
Use Scenario: Clamping transient spikes on 24V supply rails during load-dump events in door module PCBs. IC Role / Device Role / Timing Role: Fast-acting shunt protector absorbing short-duration energy surges. Use Value: 350mW rating allows safe dissipation of 100ms transients up to 33V without thermal runaway. |
Use Scenario: Protecting USB-C PD controller inputs from rail overshoot during hot-plug transitions. IC Role / Device Role / Timing Role: Secondary voltage limiter backing up primary LDO regulation. Use Value: 325Ω zener impedance ensures rapid response to >33V excursions while minimizing propagation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5261B-TP (Micro Commercial) | 33V nominal, ±5% tolerance (31.35–34.65V), 500mW rating, no AEC-Q101 qualification | Rated for commercial/industrial use only; unsuitable for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and higher power headroom is needed |
| BZX84-C33-7-F (Diodes Inc., standard grade) | Identical electrical specs but lacks AEC-Q101 validation and green compound certification | Approved for non-automotive applications only; may require additional qualification testing for automotive use | Choose for cost-sensitive consumer or industrial designs where automotive reliability is not mandated |
Compared with MMSZ5261B-TP and BZX84-C33-7-F, the BZX84C33Q-7-F uniquely delivers AEC-Q101 assurance, halogen-free materials, and guaranteed performance across extended automotive temperature ranges - critical for OEM-tier production.
Availability
BZX84C33Q-7-F is available at Aetrix Electronics and suitable for engine control units, body control modules, LED lighting drivers, and infotainment power clamping requiring stable component supply across automotive production lifecycles.
Supply support for BZX84C33Q-7-F 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 BZX84C series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The BZX84C33Q-7-F has a nominal zener voltage of 33V with a guaranteed range of 31.0V to 35.0V at 2mA test current. Breakdown begins within this range; operation below 31.0V maintains <0.1µA leakage, confirming sub-threshold blocking behavior.
Is this part suitable for use in a 12V automotive system?
Yes - it is commonly used as a clamp or reference in 12V and 24V automotive systems. Its 33V rating protects downstream circuitry from load-dump transients (up to ISO 7637-2 Pulse 5a: 120V/100ms), provided series current limiting is implemented per design guidelines.
How does the "Q" suffix affect packaging and reliability?
The "Q" denotes AEC-Q101 qualification and green (halogen/antimony-free) molding compound. Packaging remains SOT23 with 3,000-piece tape-and-reel (7-F), but lot traceability, burn-in testing, and failure analysis protocols meet automotive quality standards.
Can this Zener replace a BZX84C33-7-F in an existing design?
Yes, with full functional and mechanical compatibility. The Q-grade adds AEC-Q101 validation and environmental compliance but retains identical electrical specs, pinout, and footprint - making it a drop-in upgrade for automotive redesigns.
BZX84C33Q-7-F 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:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±6.06%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 23.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C33Q-7-F FAQ
1.How can I place an order for BZX84C33Q-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C33Q-7-F 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 BZX84C33Q-7-F reliable?
The price and inventory of BZX84C33Q-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C33Q-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C33Q-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C33Q-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C33Q-7-F?
BZX84C33Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C33Q-7-F 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 BZX84C33Q-7-F?
For technical support, including BZX84C33Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C33Q-7-F requirements.
6.How does Aetrix verify that BZX84C33Q-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C33Q-7-F 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 BZX84C33Q-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C33Q-7-F?
All BZX84C33Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C33Q-7-F, 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 BZX84C33Q-7-F part is unused and in its original packaging.
Return procedure for BZX84C33Q-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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