My Inquiry
My Account
onsemi SZBZX84C33LT1
- Part No.:
- SZBZX84C33LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C33LT1.pdf
- Description:
- DIODE ZENER 33V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:75,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZBZX84C33LT1 from onsemi is a 33 V, ±5% tolerance Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C, with 80 Ω dynamic impedance at 5 mA test current and 55 µA maximum reverse leakage at 24.8 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the SZBZX84C33LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (33 V), tolerance (±5%), thermal coefficient (+23.1 mV/°C), junction-to-ambient thermal resistance (500 °C/W), and AEC-Q101 qualification status for automotive use.
Technical Context
This device operates in reverse breakdown to maintain stable voltage across its cathode-anode terminals under varying load or supply conditions. Its 33 V nominal Zener voltage is specified at 5 mA test current (IZT), with dynamic impedance measured at 80 Ω - directly impacting regulation accuracy under transient current changes.
The SZBZX84C33LT1 features a positive temperature coefficient of +23.1 mV/°C, indicating voltage increases with rising junction temperature. It is Pb-free, RoHS-compliant, and qualified to AEC-Q101 for automotive applications, with ESD rating >16 kV per Human Body Model.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 33 V nominal, min 31 V / max 35 V at 5 mA - defines clamping threshold in protection circuits |
| Power Dissipation | 250 mW on FR-5 board - limits continuous current to ~7.6 mA at 33 V without derating |
| Zener Impedance | 80 Ω at IZT = 5 mA - determines output voltage variation under ±1 mA load change |
| Reverse Leakage | 55 µA max at VR = 24.8 V - sets minimum bias current requirement for reliable turn-on |
| Temp Coefficient | +23.1 mV/°C - requires thermal design margin for ±10°C ambient shift (±231 mV drift) |
| Capacitance | 70 pF at VR = 0 V, f = 1 MHz - affects high-frequency noise filtering capability |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration in handheld ESD-prone interfaces |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting body, corrosion-resistant finish, UL 94 V-0 flammability rating, 260°C max soldering temperature for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation |
| 2 | No Connection | Internally unconnected; must remain floating in PCB layout |
| 3 | Cathode | Connected to higher-potential node; carries regulated voltage output |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive underhood and infotainment systems requiring PPAP documentation |
| 250 mW Power Rating | Enables compact voltage reference design without external heat sinking on standard FR-5 PCB |
| ±5% Zener Tolerance | Supports cost-sensitive designs where tighter tolerance is unnecessary for functional safety margins |
| ESD >16 kV HBM | Eliminates need for discrete ESD protection in battery-input front-end stages |
| Pb-Free & RoHS | Complies with global environmental regulations and lead-free reflow soldering profiles |
Applications
| USB Power Input Protection | Automotive Cabin Sensor Reference |
|---|---|
Use Scenario: Clamps 5 V USB input surges up to 24 V during hot-plug or load-dump events in portable accessories. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy to ground. Use Value: Prevents damage to downstream LDOs or microcontrollers by limiting input voltage to ≤35 V peak. | Use Scenario: Provides stable 33 V reference for analog sensor signal conditioning in vehicle cabin temperature/humidity modules. IC Role / Device Role / Timing Role: Precision voltage reference source for ADC biasing and ratiometric scaling. Use Value: Maintains <±1% reference stability over −40°C to +125°C due to AEC-Q101 thermal validation. |
| Low-Power IoT Node Voltage Clamp | Industrial PLC Input Stage Protection |
Use Scenario: Protects BLE/Wi-Fi SoC GPIOs from ESD and inductive kickback in battery-powered smart sensors. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between I/O line and ground. Use Value: Withstands >16 kV HBM ESD strikes while adding only 70 pF capacitance to signal path. | Use Scenario: Guards 24 V DC digital input channels against field-wiring transients in factory automation controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp before optocoupler or Schmitt trigger input stage. Use Value: Limits fault voltage to 35 V, ensuring safe operation of 3.3 V logic interface ICs downstream. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C33LT1G | Same electrical specs, but BZX prefix indicates commercial-grade (non-AEC-Q101) version | Lacks automotive qualification documentation and PPAP support | Select when AEC-Q101 compliance is not required and cost is prioritized |
| SZBZX84C33LT3G | Identical electrical and mechanical specs, but supplied in 10,000-piece tape-and-reel vs. 3,000-piece | Optimized for high-volume automated assembly; same footprint and performance | Select for production runs exceeding 3,000 units to reduce handling and placement cost |
Compared with SZBZX84C33LT1, BZX84C33LT1G offers identical regulation performance but no automotive qualification, while SZBZX84C33LT3G provides identical functionality in higher-volume packaging - enabling cost-efficient scaling without redesign.
Availability
SZBZX84C33LT1 is available at Aetrix Electronics and suitable for USB power protection, automotive sensor reference, low-power IoT clamping, and industrial PLC input protection requiring stable component supply across extended temperature ranges and automotive-grade reliability.
Supply support for SZBZX84C33LT1 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SZBZX84CxxxLT1G series belongs to onsemi's automotive-qualified Zener regulator portfolio, designed specifically for robust voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the Zener voltage tolerance of SZBZX84C33LT1?
The SZBZX84C33LT1 has a nominal Zener voltage of 33 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 31 V and 35 V when tested at 5 mA (IZT). This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet, and applies across the full operating temperature range of −65°C to +150°C.
Is SZBZX84C33LT1 suitable for automotive applications?
Yes, SZBZX84C33LT1 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control modules, body electronics, and infotainment systems. The "SZ" prefix explicitly denotes compliance with automotive-specific site and process controls, and the device meets stringent requirements for temperature cycling, humidity testing, and mechanical shock endurance.
What is the pin configuration of SZBZX84C33LT1?
SZBZX84C33LT1 uses the SOT-23 package with three terminals: Pin 1 is the anode, Pin 2 is internally unconnected (must remain floating), and Pin 3 is the cathode. This pinout is documented in the "Electrical Characteristics" section (page 3) and confirmed in the "Package Dimensions" diagram (page 7) of the datasheet, with cathode identified by the polarity band on the package body.
What is the maximum power dissipation of SZBZX84C33LT1?
The maximum power dissipation of SZBZX84C33LT1 is 250 mW on FR-5 board at TA = 25°C, derating linearly by 2.0 mW/°C above that temperature. On alumina substrate, it rises to 300 mW at 25°C. These ratings are defined in the "Maximum Ratings" table (page 2) and determine safe continuous current limits - e.g., ~7.6 mA at 33 V on FR-5 before derating begins.
Does SZBZX84C33LT1 have ESD protection?
Yes, SZBZX84C33LT1 has an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM), as stated in the "Features" section (page 1) and verified in the "Absolute Maximum Ratings" summary. This level of ESD immunity allows direct integration into handheld and portable electronics without additional external ESD components in most cases.
SZBZX84C33LT1 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)
SZBZX84C33LT1 FAQ
1.How can I place an order for SZBZX84C33LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C33LT1 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 SZBZX84C33LT1 reliable?
The price and inventory of SZBZX84C33LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C33LT1 is usually 5 days.
3.What payment methods are accepted for SZBZX84C33LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C33LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C33LT1?
SZBZX84C33LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C33LT1 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 SZBZX84C33LT1?
For technical support, including SZBZX84C33LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C33LT1 requirements.
6.How does Aetrix verify that SZBZX84C33LT1 is sourced from the original manufacturer or authorized distributors?
All SZBZX84C33LT1 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 SZBZX84C33LT1 meets industry standards.
7.What is the process for return or replacement of SZBZX84C33LT1?
All SZBZX84C33LT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C33LT1, 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 SZBZX84C33LT1 part is unused and in its original packaging.
Return procedure for SZBZX84C33LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C33LT1 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…
