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Diodes Incorporated BZX84C33T-7-F
- Part No.:
- BZX84C33T-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOT-523
- Datasheet:
-
BZX84C33T-7-F.pdf
- Description:
- DIODE ZENER 33V 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:5,617
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Product details
Overview
BZX84C33T-7-F from Diodes Incorporated is a 33 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 2 mA test current with 31.0–35.0 V zener voltage tolerance, 80 Ω maximum zener impedance at 2 mA, and −0.1 µA reverse leakage at 25.2 V, used for precision voltage regulation and overvoltage protection in low-power sensor interfaces and portable power rails.
For engineers reviewing the BZX84C33T-7-F datasheet, BZX84C33T-7-F pinout, BZX84C33T-7-F application, or BZX84C33T-7-F equivalent, key selection criteria include zener voltage accuracy at low test current (2 mA), thermal resistance (833 °C/W), RoHS-compliant matte tin plating, and SOT-523 footprint compatibility with space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics, while the ultra-small SOT-523 package supports high-density mounting on compact PCBs.
It delivers regulated output with ±3.0% nominal voltage tolerance (33.0 V ±2.0 V), exhibits low dynamic impedance (80 Ω at 2 mA), and maintains stable performance across −65 °C to +150 °C operating temperature range - critical for industrial and automotive auxiliary circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33.0 V nominal, 31.0–35.0 V range at IZT = 2 mA - defines regulation setpoint for reference or clamp function |
| Power Dissipation (PD) | 150 mW at TA = 25 °C - limits continuous clamping energy in low-duty-cycle protection schemes |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 2 mA - determines voltage deviation under small-signal load variation |
| Reverse Leakage (IR) | 0.1 µA max at VR = 25.2 V - ensures minimal quiescent current in battery-powered standby circuits |
| Thermal Resistance (RθJA) | 833 °C/W - requires careful pad layout per AP02001 to avoid derating above 25 °C ambient |
| Operating Temperature | −65 °C to +150 °C - supports deployment in under-hood or industrial control environments |
| Package | SOT-523 - 1.6 mm × 0.8 mm footprint with 0.5 mm height, compatible with standard pick-and-place equipment |
Pinout & Package
SOT-523 package: 3-terminal surface-mount device with anode (pin 1), cathode (pin 2), and no third functional terminal - polarity confirmed by cathode band marking on top view; terminals are solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / Zener reference ground node | Connected to lower-potential rail; establishes reference point for reverse-biased operation |
| Cathode | Zener breakdown terminal / voltage regulation output | Connected to regulated node; conducts when input exceeds 33 V, clamping excess voltage |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT-523 footprint | Enables placement in <1.0 mm² board area - ideal for wearables and miniaturized IoT sensors |
| Planar die construction | Ensures tight VZ distribution and repeatable ZZT across production lots |
| Lead-free / RoHS-compliant plating | Matte tin finish over Alloy 42 leadframe meets global environmental compliance requirements |
| "Green" molding compound | Halogen-free encapsulation (Date Code UO and newer) reduces toxic emissions during PCB rework |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Protecting 3.3 V ADC inputs from transient overvoltage in factory-floor pressure transducers. IC Role / Device Role / Timing Role: Zener clamp limiting input to 33 V before series resistor and TVS, preventing ADC saturation and latch-up. Use Value: Maintains 0.1 µA leakage at 25.2 V, avoiding signal offset drift in high-impedance sensor bridges. | Use Scenario: Secondary overvoltage safeguard on 20 V USB-C PD bus during adapter hot-plug events. IC Role / Device Role / Timing Role: Standby shunt regulator activated only during >33 V fault, complementing primary 24 V TVS array. Use Value: 80 Ω dynamic impedance ensures predictable clamping voltage rise under 2 mA surge tail current. |
| Automotive Cabin Control Panel | Medical Portable Monitor Battery Rail |
Use Scenario: Stabilizing 5 V microcontroller supply against load-dump-induced spikes in HVAC control modules. IC Role / Device Role / Timing Role: Low-power voltage reference for comparator-based overvoltage detection circuit. Use Value: −65 °C to +150 °C rating allows direct placement near engine-compartment-facing PCB edges. | Use Scenario: Regulating 3.7 V Li-ion battery backup rail for real-time clock during main power loss. IC Role / Device Role / Timing Role: Precision 33 V reference source for analog-to-digital conversion of battery health metrics. Use Value: 31.0–35.0 V tolerance enables calibration traceability to NIST-standard voltage sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5265BLT1G | 33 V nominal, 31.35–34.65 V tolerance at 3.8 mA; 100 Ω ZZT; SOT-23 package (larger footprint) | Higher test current shifts regulation point; SOT-23 requires 3× board area vs. SOT-523 | Select when higher surge current handling (200 mW) outweighs size constraints |
| BZX84-C33-TP | 33 V nominal, 31–35 V tolerance at 2 mA; 80 Ω ZZT; identical SOT-523, but Pb-containing plating | No RoHS compliance; incompatible with EU medical or consumer shipments | Choose only for legacy industrial repair where lead-free exemption applies |
Compared with MMBZ5265BLT1G and BZX84-C33-TP, BZX84C33T-7-F offers optimal balance of ultra-compact size, RoHS compliance, and tight 2 mA test-point regulation - making it preferred for new designs targeting space and regulatory constraints.
Availability
BZX84C33T-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp circuits, automotive cabin control panels, and medical portable monitor battery rails requiring stable component supply and full RoHS compliance.
Supply support for BZX84C33T-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 centers across Asia and manufacturing in Taiwan and China.
The BZX84 series belongs to Diodes' precision Zener voltage reference product line, engineered specifically for low-power regulation, voltage clamping, and reference generation in space-constrained, thermally demanding applications.
FAQ
What is the maximum reverse voltage this Zener can withstand without breakdown?
The BZX84C33T-7-F has a nominal zener voltage of 33.0 V with a guaranteed breakdown range of 31.0–35.0 V at 2 mA test current. Below 31.0 V, it remains in high-impedance reverse-blocking mode with ≤0.1 µA leakage at 25.2 V - no hard "maximum non-breakdown voltage" is specified, as breakdown is gradual and current-dependent.
Can this device be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficient and mismatched VZ tolerances, causing current hogging when paralleled. The 150 mW rating assumes single-device operation on FR-4 with recommended pad layout (AP02001); derating is required above 25 °C ambient per the 833 °C/W RθJA.
Is the SOT-523 package compatible with standard reflow profiles?
Yes - the device is qualified for lead-free reflow per J-STD-020D Level 1 moisture sensitivity, with peak temperature up to 260 °C. Its matte tin plating and UL 94V-0 molded plastic case ensure reliability under IPC-A-610 Class 2/3 thermal cycles without delamination or voiding.
How does temperature affect its zener voltage stability?
At IZT = 5 mA, the temperature coefficient is +23.1 to +33.4 mV/°C - meaning VZ increases ~28 mV per °C rise. For stable references, use at fixed temperature or pair with compensating components; for clamping, this drift is typically acceptable within system margin.
BZX84C33T-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±6.06%
- Power - Max:
- 150 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-523
BZX84C33T-7-F FAQ
1.How can I place an order for BZX84C33T-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C33T-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 BZX84C33T-7-F reliable?
The price and inventory of BZX84C33T-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 BZX84C33T-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C33T-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C33T-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C33T-7-F?
BZX84C33T-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C33T-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 BZX84C33T-7-F?
For technical support, including BZX84C33T-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C33T-7-F requirements.
6.How does Aetrix verify that BZX84C33T-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C33T-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 BZX84C33T-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C33T-7-F?
All BZX84C33T-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C33T-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 BZX84C33T-7-F part is unused and in its original packaging.
Return procedure for BZX84C33T-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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