My Inquiry
My Account
onsemi SZBZX84C33LT3
- Part No.:
- SZBZX84C33LT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C33LT3.pdf
- Description:
- DIODE ZENER 33V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:170,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZBZX84C33LT3 from onsemi is a 33 V, ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 80 Ω dynamic impedance at 5 mA test current and 55 μA maximum reverse leakage at 25.1 V, used for precision voltage regulation in portable power rails and reference circuits.
For engineers reviewing the SZBZX84C33LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (33 V), tolerance (±5%), thermal resistance (556 °C/W), ESD rating (>16 kV HBM), and automotive-grade qualification per AEC-Q101.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to clamp voltage across its terminals. Its Zener voltage is specified at three test currents (2 mA, 10 mA, 20 mA), with temperature coefficient of +23.1 mV/°C at 5 mA, indicating positive drift above 6 V nominal range.
The SOT-23 package features cathode-indicated polarity band, void-free thermosetting plastic case rated UL 94 V-0, and supports reflow soldering up to 260°C for 10 seconds. Pin 2 is internally unconnected - only pins 1 (anode) and 3 (cathode) are electrically active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.0–35.0 V @ IZT = 2 mA; defines stable regulation window under low-current bias |
| Zener Impedance (ZZT) | 80 Ω @ IZT = 2 mA; limits output voltage variation under load transients |
| Power Dissipation | 225 mW on FR-5 board @ 25°C; derates 1.8 mW/°C above ambient - sets max continuous current limit |
| Reverse Leakage (IR) | 50 nA @ VR = 25.1 V; ensures minimal quiescent current in standby regulation |
| Temperature Coefficient | +23.1 mV/°C @ IZT = 2 mA; quantifies voltage drift over industrial temp range (−65°C to +150°C) |
| Capacitance | 70 pF @ VR = 0 V, f = 1 MHz; impacts high-frequency noise filtering and transient response |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; enables robust handling in automated assembly without protection circuitry |
Pinout & Package
SOT-23 (Case 318-08) surface-mount plastic package with cathode indicated by polarity band; dimensions: 2.90 mm × 1.30 mm × 0.95 mm (L × W × H); RoHS-compliant, Pb-free option available (G suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation |
| 2 | No Connection | Internally unconnected; no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential node; voltage referenced to this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics |
| 225 mW FR-5 Power Rating | Enables compact voltage clamping in space-constrained PCBs without heatsinking |
| Tight Thermal Resistance | 556 °C/W junction-to-ambient allows operation up to +125°C ambient with derating |
| UL 94 V-0 Flammability | Meets safety standards for consumer and industrial end equipment enclosures |
| Polarity Band Marking | Ensures reliable orientation during automated optical inspection and pick-and-place |
Applications
| Portable Power Rail Clamping | Reference Voltage Source |
|---|---|
|
Use Scenario: Stabilizing 3.3 V or 5 V supply rails in battery-powered IoT sensors where input voltage may surge during hot-swap or load dump. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing excess current to hold rail within ±3% tolerance. Use Value: Prevents MCU brownout or ADC reference shift using only one passive component with <50 nA leakage at 25 V. |
Use Scenario: Providing stable 33 V reference for analog front-end comparators in industrial motor drive feedback circuits. IC Role / Device Role / Timing Role: Precision voltage reference node for op-amp biasing and threshold detection. Use Value: Delivers <80 Ω dynamic impedance and +23.1 mV/°C TC, enabling <±1.5% total error over −40°C to +85°C. |
| ESD Protection Clamp | Automotive LIN Bus Termination |
|
Use Scenario: Protecting UART lines in handheld medical devices against contact ESD events per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Low-capacitance (70 pF) shunt clamp diverting transient energy to ground. Use Value: Survives >16 kV HBM ESD without degradation while adding negligible signal distortion to 1 Mbps serial data. |
Use Scenario: Biasing LIN transceiver termination resistors in automotive door module ECUs operating at 12 V battery supply. IC Role / Device Role / Timing Role: Zener-based voltage clamp maintaining stable 33 V bias for LIN bus pull-up network. Use Value: AEC-Q101 qualification ensures reliability across temperature cycling and vibration profiles per ISO 16750. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C33LT3 | Standard tolerance (±5%), 225 mW, SOT-23, non-automotive grade | General-purpose industrial and consumer use; no AEC-Q101 validation | Select when cost sensitivity outweighs automotive qualification requirements |
| SZBZX84C33LT3G | Pb-free variant with identical electrical specs and AEC-Q101 qualification | Required for RoHS-compliant automotive production and export-controlled programs | Preferred for new designs targeting global automotive OEMs and Tier 1 suppliers |
Compared with BZX84C33LT3 and SZBZX84C33LT3G, the SZBZX84C33LT3 offers identical Zener performance but adds AEC-Q101 compliance and site-specific control change tracking - critical for automotive PPAP submissions without altering PCB layout or bill-of-materials.
Availability
SZBZX84C33LT3 is available at Aetrix Electronics and suitable for portable power rail clamping, reference voltage sourcing, and automotive LIN bus termination requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SZBZX84C33LT3 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
onsemi (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZBZX84C33LT3 belongs to the BZX84CxxxLT1G family of Zener regulators designed specifically for high-density, surface-mount voltage reference and clamping in automotive and industrial systems.
FAQ
What is the Zener voltage tolerance of SZBZX84C33LT3?
The SZBZX84C33LT3 has a nominal Zener voltage of 33 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 31.0 V and 35.0 V when tested at 2 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet revision 14, and applies across the full operating temperature range of −65°C to +150°C.
Is SZBZX84C33LT3 qualified for automotive applications?
Yes, SZBZX84C33LT3 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes automotive-grade manufacturing controls, including unique site and process change tracking - making SZBZX84C33LT3 suitable for engine control units, body electronics, and other automotive subsystems requiring validated reliability.
What is the maximum power dissipation of SZBZX84C33LT3 on an FR-5 board?
SZBZX84C33LT3 is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient temperature, with a derating factor of 1.8 mW/°C above 25°C. This value is defined in the Maximum Ratings table on page 2 of the datasheet and reflects real-world thermal performance on standard PCB materials used in consumer and industrial designs.
Does SZBZX84C33LT3 have a connected pin 2?
No, pin 2 of SZBZX84C33LT3 is internally unconnected (NC), as confirmed in the Pinout: 1-Anode, 2-No Connection, 3-Cathode note on page 2 and page 3 of the datasheet. This is a structural feature of the SOT-23 package for this Zener series - PCB layout must omit any trace or pad for pin 2 to avoid unintended shorts or assembly defects.
What is the ESD rating of SZBZX84C33LT3?
SZBZX84C33LT3 has an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM), as specified in the Features section on page 1 of the datasheet. This rating is verified through standardized testing and confirms robustness during automated board assembly, handling, and field operation without requiring external ESD protection components.
SZBZX84C33LT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±6%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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 (TO-236)
SZBZX84C33LT3 FAQ
1.How can I place an order for SZBZX84C33LT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C33LT3 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 SZBZX84C33LT3 reliable?
The price and inventory of SZBZX84C33LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C33LT3 is usually 5 days.
3.What payment methods are accepted for SZBZX84C33LT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C33LT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C33LT3?
SZBZX84C33LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C33LT3 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 SZBZX84C33LT3?
For technical support, including SZBZX84C33LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C33LT3 requirements.
6.How does Aetrix verify that SZBZX84C33LT3 is sourced from the original manufacturer or authorized distributors?
All SZBZX84C33LT3 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 SZBZX84C33LT3 meets industry standards.
7.What is the process for return or replacement of SZBZX84C33LT3?
All SZBZX84C33LT3 units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C33LT3, 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 SZBZX84C33LT3 part is unused and in its original packaging.
Return procedure for SZBZX84C33LT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C33LT3 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
