My Inquiry
My Account
onsemi SZ1SMB5933BT3G
- Part No.:
- SZ1SMB5933BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5933BT3G.pdf
- Description:
- DIODE ZENER 22V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:9,965
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZ1SMB5933BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 22 V (±5%), 17 Ω maximum dynamic impedance at 17.5 mA test current, and 0.25 μA reverse leakage at 16.7 V. It operates across −65 °C to +150 °C and is AEC−Q101 qualified for automotive power rail clamping and voltage reference applications.
For engineers reviewing the SZ1SMB5933BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 22 V regulation tolerance, 3 W steady-state power at TL = 75 °C, thermal resistance of 40 °C/W junction-to-lead, and SMB package compatibility with automated SMT assembly.
Technical Context
This device functions as a precision DC voltage regulator and overvoltage clamp in low-power analog and power supply circuits. Its 22 V nominal Zener voltage is specified at IZT = 17.5 mA with ±5% tolerance, and it maintains stable regulation under thermal equilibrium at 25 °C ambient.
The diode exhibits 17 Ω maximum Zener impedance at IZT and 650 Ω at IZK = 1 mA, supporting stable regulation across load variations. Its 0.25 μA leakage at VR = 16.7 V ensures minimal standby current in battery-sensitive designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.9 V (min) to 23.1 V (max) at IZT = 17.5 mA - defines regulated output range under standard test conditions |
| Power Dissipation (PD) | 3.0 W @ TL = 75 °C - maximum continuous power at lead temperature; derates 25 mW/°C above 75 °C |
| Zener Impedance (ZZT) | 17 Ω max @ IZT = 17.5 mA - low dynamic impedance ensures tight voltage regulation under varying load |
| Reverse Leakage (IR) | 0.25 μA max @ VR = 16.7 V - enables ultra-low quiescent current in always-on protection circuits |
| Junction-to-Lead Thermal Resistance (RJL) | 40 °C/W - supports efficient heat transfer to PCB copper when mounted with recommended footprint |
| Operating Temperature Range | −65 °C to +150 °C - validated for under-hood automotive and industrial environments |
| AEC−Q101 Qualified | Yes - certified for automotive-grade reliability and PPAP compliance per onsemi documentation |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with cathode polarity band, Pb-free, UL 94 V-0 rated, and modified L-bend leads for enhanced solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener operation; carries full Zener current during regulation |
| Cathode | Zener breakdown terminal | Marked with polarity band; connected to higher-potential node; defines regulated output voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| 3 W Power Rating at TL = 75 °C | Enables robust overvoltage clamping in 12 V/24 V automotive subsystems without external heatsinking |
| ESD Rating > 16 kV (HBM) | Provides inherent system-level ESD immunity for CAN/LIN bus interface protection and sensor signal conditioning |
| AEC−Q101 Qualification | Validates long-term reliability for automotive body control modules, lighting drivers, and ADAS power domains |
| Flat Handling Surface | Ensures consistent pick-and-place accuracy during high-speed SMT assembly on dense PCBs |
| Pb-Free Construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Clamping transient spikes on 12 V supply rails feeding microcontrollers and LIN transceivers. IC Role / Device Role / Timing Role: Voltage reference and overvoltage protector for 5 V/3.3 V LDO input stages. Use Value: Prevents latch-up and damage during load dump events up to ISO 7637-2 Pulse 5a (120 V/100 ms). |
Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure sensors in factory automation. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable 22 V bias to sensor bridge circuitry. Use Value: Maintains <±0.5% output stability over −40 °C to +85 °C ambient, reducing calibration drift. |
| USB-C Power Delivery Protection | Telecom Line Interface Card (LIC) |
Use Scenario: Secondary-side overvoltage clamp on 20 V PPS (Programmable Power Supply) rails. IC Role / Device Role / Timing Role: Fast-response shunt limiter preventing damage to USB-C controller ICs during adapter fault conditions. Use Value: Responds within <100 ns to 30 V transients, limiting peak voltage to ≤23.1 V with <17 Ω dynamic impedance. |
Use Scenario: DC feed voltage regulation and surge suppression on analog telephone line interfaces. IC Role / Device Role / Timing Role: Zener reference for SLIC (Subscriber Line Interface Circuit) biasing and ring-trip detection thresholds. Use Value: Delivers 22 V reference with 0.25 μA leakage, minimizing standby power draw in always-on telecom infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5933BT3G | Same electrical specs and SMB package; lacks AEC−Q101 qualification and SZ-prefix automotive traceability | Approved for commercial/industrial use only; not suitable for automotive PPAP-controlled production | Select when AEC−Q101 compliance is unnecessary and cost sensitivity outweighs automotive audit requirements |
| BZX84-C22LT1G | Lower 350 mW power rating, SOT-23 package, 22 V ±5%, 55 Ω ZZT @ 5 mA - not drop-in compatible | Targeted at space-constrained portable electronics; insufficient for 3 W surge handling in automotive | Choose only for low-power, board-area-limited designs where 22 V regulation suffices and thermal margin is ample |
Compared with 1SMB5933BT3G, SZ1SMB5933BT3G adds AEC−Q101 validation and automotive change control; versus BZX84-C22LT1G, it delivers 8.6× higher power handling and 3× lower Zener impedance, enabling robust clamping in harsh environments.
Availability
SZ1SMB5933BT3G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, USB-C power delivery protection, and telecom line interface cards requiring stable component supply and AEC−Q101 traceability.
Supply support for SZ1SMB5933BT3G 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.
SZ1SMB5933BT3G belongs to the 1SMB59xxBT3G/SZ1SMB59xxT3G series - engineered specifically for high-reliability voltage regulation and transient suppression in automotive and industrial power systems.
FAQ
What is the Zener voltage tolerance for SZ1SMB5933BT3G?
The SZ1SMB5933BT3G has a nominal Zener voltage of 22 V with a tolerance of ±5%, meaning the actual measured VZ falls between 20.9 V and 23.1 V at IZT = 17.5 mA and TL = 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies to all devices in the SZ1SMB59xxBT3G series.
Is SZ1SMB5933BT3G suitable for automotive applications?
Yes, SZ1SMB5933BT3G 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 change management, making SZ1SMB5933BT3G appropriate for under-hood and chassis-mounted automotive electronics.
What is the maximum power dissipation of SZ1SMB5933BT3G at 25 °C ambient?
SZ1SMB5933BT3G is rated for 550 mW maximum steady-state power dissipation at TA = 25 °C, with a derating factor of 4.4 mW/°C above that temperature. This value is distinct from its 3.0 W rating at TL = 75 °C and reflects thermal limitations when heat is transferred primarily through ambient air rather than the leads.
Does SZ1SMB5933BT3G have ESD protection built-in?
Yes, SZ1SMB5933BT3G features an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM), as documented in the Features section of the onsemi datasheet. This intrinsic ESD robustness eliminates the need for external TVS diodes in many low-energy interface protection schemes.
What is the reverse leakage current specification for SZ1SMB5933BT3G?
The reverse leakage current for SZ1SMB5933BT3G is specified as 0.25 μA maximum at VR = 16.7 V, per the Electrical Characteristics table on page 3 of the onsemi datasheet. This low leakage supports energy-efficient operation in always-on circuits such as battery-backed sensor nodes and telecom line interfaces.
SZ1SMB5933BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 17.5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SZ1SMB5933BT3G FAQ
1.How can I place an order for SZ1SMB5933BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5933BT3G 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 SZ1SMB5933BT3G reliable?
The price and inventory of SZ1SMB5933BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5933BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5933BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5933BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5933BT3G?
SZ1SMB5933BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5933BT3G 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 SZ1SMB5933BT3G?
For technical support, including SZ1SMB5933BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5933BT3G requirements.
6.How does Aetrix verify that SZ1SMB5933BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5933BT3G 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 SZ1SMB5933BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5933BT3G?
All SZ1SMB5933BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5933BT3G, 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 SZ1SMB5933BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5933BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZ1SMB5933BT3G 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…
