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Diodes Incorporated BZX84B33-7-F
- Part No.:
- BZX84B33-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B33-7-F.pdf
- Description:
- DIODE ZENER 33V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:915
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Product details
Overview
BZX84B33-7-F from Diodes Incorporated is a precision 33 V ±2% tolerance Zener diode in SOT23 package, rated for 350 mW power dissipation at ambient temperature, with 80 Ω maximum Zener impedance at 2 mA test current and 0.1 µA maximum reverse leakage at 23.1 V, used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84B33-7-F datasheet, BZX84B33-7-F pinout, BZX84B33-7-F application, or BZX84B33-7-F equivalent, key selection criteria include zener voltage tolerance (±2%), thermal resistance (357 °C/W), junction-to-ambient derating behavior, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and supply conditions. It exhibits a positive temperature coefficient of +27.4 mV/°C above 12 V, enabling predictable drift compensation in reference designs.
The device delivers 33 V nominal regulation at 2 mA test current (IZT), with 32.3–33.7 V guaranteed range, 325 Ω maximum knee impedance (ZZK) at 0.5 mA, and 0.1 µA reverse current (IR) at VR = 23.1 V - confirming tight regulation and low leakage for precision biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, 32.3–33.7 V min/max at 2 mA - ensures stable reference within ±2% tolerance for feedback loops. |
| Power Dissipation (PD) | 350 mW at TA = 25°C with terminals held at ambient - defines maximum continuous power before thermal derating applies. |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 2 mA - indicates low dynamic resistance for minimal output voltage variation under load changes. |
| Reverse Leakage (IR) | 0.1 µA max at VR = 23.1 V - confirms high blocking integrity below breakdown, critical for low-current bias networks. |
| Thermal Resistance (RθJA) | 357 °C/W - quantifies junction-to-ambient heat transfer efficiency on standard FR-4 PCB with recommended pad layout. |
| Temperature Coefficient | +27.4 mV/°C - enables predictable voltage drift compensation in temperature-sensitive references. |
Pinout & Package
Package: SOT23 - surface-mount, 3-terminal plastic case with matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1, weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground node | Connected to circuit ground or lower-potential node; polarity must match schematic symbol to avoid forward conduction during regulation. |
| Cathode (Pin 2) | Zener regulation output / voltage reference node | Provides regulated 33 V relative to anode; serves as stable bias point for op-amp references or ADC voltage references. |
| No-Connect (Pin 3) | Internal die attach flag / mechanical support | Not electrically connected; functions solely as structural reinforcement and thermal path enhancement in SOT23 mold compound. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct replacement in precision 33 V reference designs without recalibration or resistor trimming. |
| AEC-Q101 qualification | Validates suitability for automotive electronics including body control modules and sensor signal conditioning where reliability is mandated. |
| Lead-free, halogen-free "Green" construction | Meets RoHS 3 (2015/863/EU) and JEDEC J-STD-020 moisture sensitivity Level 1 requirements for automated reflow assembly. |
| 350 mW power rating with defined derating curve | Supports operation up to +125°C ambient when mounted per recommended pad layout, enabling use in compact industrial enclosures. |
Applications
| Automotive Sensor Signal Conditioning | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive temperature detectors (RTDs) in engine coolant temperature sensors. IC Role / Device Role / Timing Role: Zener reference providing fixed 33 V bias to bridge circuitry, ensuring consistent measurement accuracy across temperature ranges. Use Value: ±2% tolerance and +27.4 mV/°C TC enable predictable offset correction in ECU firmware without hardware recalibration. |
Use Scenario: Clamping input transients on 0–10 V analog inputs of programmable logic controllers exposed to field wiring noise. IC Role / Device Role / Timing Role: Overvoltage protection element shunting surge energy to ground before it reaches precision ADC front-end. Use Value: 350 mW rating and 80 Ω ZZT ensure fast response to 1 kV/ms transients while maintaining sub-µA leakage during normal operation. |
| Medical Instrumentation Reference | Consumer Audio Power Supply Regulation |
Use Scenario: Generating stable reference for 24-bit delta-sigma ADCs in portable ECG monitors requiring low-noise DC bias. IC Role / Device Role / Timing Role: Low-drift voltage reference source feeding op-amp gain stages prior to digitization. Use Value: 0.1 µA IR at 23.1 V and 325 Ω ZZK at 0.5 mA minimize loading error and noise coupling into sensitive analog signal paths. |
Use Scenario: Regulating auxiliary 33 V rail for headphone amplifier ICs in battery-powered Bluetooth speakers. IC Role / Device Role / Timing Role: Simple shunt regulator maintaining constant voltage despite Li-ion battery discharge from 4.2 V to 3.0 V. Use Value: SOT23 footprint and 0.008 g weight support ultra-compact PCB layouts while delivering stable bias under pulsed audio loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5262B-7-F | 33 V nominal, ±5% tolerance, 350 mW, 100 Ω ZZT at 5 mA | Higher voltage tolerance and impedance reduce regulation accuracy in precision references | Select when cost sensitivity outweighs ±2% requirement and higher test current (5 mA vs. 2 mA) is acceptable. |
| BZX84-C33-7-F | 33 V nominal, ±5% tolerance, same SOT23 package and 350 mW rating | Lacks AEC-Q101 qualification and tighter tolerance; not suitable for automotive deployments | Choose only for non-automotive consumer applications where ±5% regulation is sufficient and qualification is not required. |
Compared with MMBZ5262B-7-F and BZX84-C33-7-F, BZX84B33-7-F provides superior voltage stability (±2% vs. ±5%), lower dynamic impedance (80 Ω vs. ≥100 Ω), and automotive-grade reliability - making it optimal for safety-critical or high-accuracy analog subsystems.
Availability
BZX84B33-7-F is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, medical instrumentation references, and consumer audio power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84B33-7-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
BZX84B series belongs to Diodes' precision Zener diode product line, engineered specifically for high-reliability voltage reference and overvoltage protection in automotive, industrial, and medical systems demanding tight tolerance and AEC-Q101 compliance.
FAQ
What is the maximum allowable junction temperature for BZX84B33-7-F?
The absolute maximum junction temperature is +150°C, as specified in the Electrical Characteristics table. Operation above this limit risks permanent degradation of Zener characteristics and packaging integrity. Derating begins at +25°C ambient per Figure 1, reducing power handling linearly to zero at +150°C junction.
Does BZX84B33-7-F require a series current-limiting resistor in shunt regulator configurations?
Yes - a series resistor is mandatory to limit Zener current within the 2 mA test condition and prevent exceeding 350 mW dissipation. For a 36 V input supplying 33 V to a 10 kΩ load, a minimum 1.5 kΩ resistor ensures safe operation while maintaining regulation across load variations.
How does the +27.4 mV/°C temperature coefficient affect circuit performance?
This positive coefficient means output voltage increases by 27.4 mV per degree Celsius rise in junction temperature. In precision references, it necessitates either thermal shielding, compensation networks, or firmware-based offset correction - especially in environments with >30°C ambient swings.
Is BZX84B33-7-F compatible with lead-free reflow soldering profiles?
Yes - it is fully RoHS 3 compliant with matte tin finish on Alloy 42 leads and qualified for peak reflow temperatures up to 260°C per JEDEC J-STD-020. Its moisture sensitivity level 1 eliminates bake requirements prior to assembly, supporting high-yield automated placement and reflow.
BZX84B33-7-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:
- ±2%
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84B33-7-F FAQ
1.How can I place an order for BZX84B33-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B33-7-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 BZX84B33-7-F reliable?
The price and inventory of BZX84B33-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B33-7-F is usually 5 days.
3.What payment methods are accepted for BZX84B33-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B33-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B33-7-F?
BZX84B33-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B33-7-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 BZX84B33-7-F?
For technical support, including BZX84B33-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B33-7-F requirements.
6.How does Aetrix verify that BZX84B33-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84B33-7-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 BZX84B33-7-F meets industry standards.
7.What is the process for return or replacement of BZX84B33-7-F?
All BZX84B33-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B33-7-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 BZX84B33-7-F part is unused and in its original packaging.
Return procedure for BZX84B33-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B33-7-F Tags
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