My Inquiry
My Account
onsemi SZMMBZ5229BLT1
- Part No.:
- SZMMBZ5229BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5229BLT1.pdf
- Description:
- DIODE ZENER 4.3V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:147,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMBZ5229BLT1 from onsemi is a 4.3 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 22 Ω dynamic impedance at 20 mA test current and 5 µA reverse leakage at 1 V reverse bias - used for precision voltage reference and overvoltage protection in compact portable electronics.
For engineers reviewing the SZMMBZ5229BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W), ESD rating (>16 kV HBM), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its cathode-anode terminals. Its 4.3 V nominal Zener voltage is specified at 20 mA test current (IZT), with temperature coefficient near zero crossing in the 4–5 V range per typical characterization data.
The SOT-23 package features a no-connect (NC) terminal (Pin 2), enabling mechanical stability without electrical function. It supports automated placement and reflow soldering up to 260°C for 10 seconds, with UL 94 V-0 flammability rating and Pb-free, halogen-free construction compliant with RoHS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.3 V @ IZT = 20 mA - defines regulated output voltage under standard test conditions |
| Zener Voltage Tolerance | ±5% (4.08 V to 4.52 V) - sets absolute accuracy band for voltage reference use |
| Zener Impedance | 22 Ω @ IZT = 20 mA - determines regulation stiffness and AC ripple rejection capability |
| Reverse Leakage Current | 5 µA @ VR = 1 V - limits standby power loss in low-current bias networks |
| Power Dissipation | 225 mW @ TA = 25°C on FR-5 board - defines maximum continuous DC power handling before thermal derating |
| Thermal Resistance | 556 °C/W junction-to-ambient - quantifies temperature rise per watt dissipated on standard PCB |
| ESD Rating | Class 3 (>16 kV) per HBM - ensures robustness against human-body electrostatic discharge during handling |
Pinout & Package
SOT-23 surface-mount plastic package (Case 318, Style 8), void-free transfer-molded thermosetting case with corrosion-resistant, solderable finish; polarity indicated by cathode band; UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in reverse-bias regulation configuration |
| 2 | No Connection | Mechanical support only; must remain unconnected in PCB layout and schematic |
| 3 | Cathode | Reverse-biased terminal; connects to higher-potential node and carries regulated voltage reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and body electronics requiring PPAP compliance |
| 225 mW Power Rating | Enables stable voltage clamping in space-constrained layouts without external heatsinking on standard FR-5 PCBs |
| ESD Robustness >16 kV HBM | Eliminates need for external ESD protection in handheld and portable designs subject to frequent handling |
| Pb-Free / Halogen-Free | Meets global environmental regulations (RoHS, JEDEC J-STD-020) without compromising solder joint reliability |
| Optimized for Automated Assembly | Standard SOT-23 footprint and marking support high-speed pick-and-place and AOI inspection |
Applications
| Automotive Body Control Module | Smartphone Power Rail Protection |
|---|---|
|
Use Scenario: Clamping transient spikes on 5 V microcontroller supply lines in door module ECUs exposed to load-dump events. IC Role / Device Role / Timing Role: Voltage reference and overvoltage clamp protecting downstream logic ICs from >12 V surges. Use Value: Maintains 4.3 V regulation with <22 Ω impedance to limit clamping voltage excursion within MCU absolute maximum ratings. |
Use Scenario: Providing stable reference for battery fuel-gauge ADC in lithium-ion powered handsets. IC Role / Device Role / Timing Role: Precision analog voltage reference source for 12-bit internal ADC calibration. Use Value: Delivers ±5% voltage accuracy and <5 µA leakage to minimize quiescent current impact on battery life. |
| Industrial Sensor Signal Conditioning | USB-C Port Overvoltage Protection |
|
Use Scenario: Biasing op-amp input stages in 4–20 mA loop transmitters operating across −40°C to +125°C ambient. IC Role / Device Role / Timing Role: Temperature-stable voltage reference establishing common-mode level for differential signal amplification. Use Value: Near-zero TC region around 4.3 V minimizes drift-induced offset error over full industrial temperature range. |
Use Scenario: Protecting USB-C controller I/O pins from accidental 12 V adapter misconnection. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting pin voltage to safe levels during fault conditions. Use Value: Responds within nanoseconds to clamp transients while sustaining 225 mW peak power without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | Same 4.3 V nominal Zener, but rated 300 mW on FR-4; no AEC-Q101 qualification; 60 Ω Zener impedance | Targeted at commercial-grade consumer electronics, not automotive systems | Select when higher power margin is needed and automotive qualification is unnecessary |
| MMBZ5229BLT1G | Identical electrical specs and SOT-23 package; differs only in prefix (MMBZ vs SZ) indicating non-automotive grade | Lacks PPAP documentation and AEC-Q101 stress testing validation | Choose for cost-sensitive industrial or computing applications where automotive traceability is not required |
Compared with BZX84-C4V3 and MMBZ5229BLT1G, SZMMBZ5229BLT1 provides guaranteed AEC-Q101 compliance, tighter thermal resistance control (556 °C/W), and documented >16 kV HBM ESD robustness - making it the sole choice for production automotive modules requiring PPAP submission.
Availability
SZMMBZ5229BLT1 is available at Aetrix Electronics and suitable for automotive body electronics, smartphone power management, industrial sensor interfaces, and USB-C port protection requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for SZMMBZ5229BLT1 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5229BLT1 belongs to the SZMMBZ52xxBLT1G series of AEC-Q101-qualified Zener regulators designed specifically for automotive subsystems requiring high-reliability voltage reference and transient suppression in compact SOT-23 form factor.
FAQ
What is the Zener voltage tolerance of SZMMBZ5229BLT1?
The SZMMBZ5229BLT1 has a Zener voltage tolerance of ±5%, meaning its actual breakdown voltage falls between 4.08 V and 4.52 V when tested at 20 mA (IZT) and 25°C ambient. This tolerance is guaranteed across the full operating temperature range and is verified during production screening per onsemi's AEC-Q101 qualification protocol.
Is SZMMBZ5229BLT1 suitable for automotive applications?
Yes, SZMMBZ5229BLT1 is explicitly qualified to AEC-Q101 standards and supports PPAP documentation, making it suitable for automotive applications such as body control modules, infotainment power rails, and sensor interface circuits. Its construction includes enhanced process controls, lot traceability, and stress testing beyond commercial-grade equivalents like MMBZ5229BLT1G.
What is the maximum power dissipation of SZMMBZ5229BLT1 on a standard PCB?
SZMMBZ5229BLT1 is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient temperature. Above 25°C, it derates linearly at 1.8 mW/°C. This rating assumes standard JEDEC-defined copper area and is validated for reliable operation without thermal runaway in typical high-density layouts.
Does SZMMBZ5229BLT1 have a no-connect pin, and how should it be handled in layout?
Yes, SZMMBZ5229BLT1 uses Pin 2 as a no-connect (NC) terminal per its official pinout. In PCB layout, Pin 2 must remain unconnected - neither routed nor tied to ground or any net. Its presence improves mechanical stability during reflow but carries no electrical function; connecting it risks unintended parasitic paths or assembly defects.
How does the ESD rating of SZMMBZ5229BLT1 compare to standard commercial Zeners?
SZMMBZ5229BLT1 achieves Class 3 HBM ESD rating (>16 kV), significantly exceeding typical commercial Zeners rated at 8 kV or less. This high ESD robustness eliminates the need for supplemental TVS devices in handheld and automotive assembly environments, reducing BOM count and improving long-term field reliability in electrostatic-prone settings.
SZMMBZ5229BLT1 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):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5229BLT1 FAQ
1.How can I place an order for SZMMBZ5229BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5229BLT1 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 SZMMBZ5229BLT1 reliable?
The price and inventory of SZMMBZ5229BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5229BLT1 is usually 5 days.
3.What payment methods are accepted for SZMMBZ5229BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5229BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5229BLT1?
SZMMBZ5229BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5229BLT1 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 SZMMBZ5229BLT1?
For technical support, including SZMMBZ5229BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5229BLT1 requirements.
6.How does Aetrix verify that SZMMBZ5229BLT1 is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5229BLT1 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 SZMMBZ5229BLT1 meets industry standards.
7.What is the process for return or replacement of SZMMBZ5229BLT1?
All SZMMBZ5229BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5229BLT1, 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 SZMMBZ5229BLT1 part is unused and in its original packaging.
Return procedure for SZMMBZ5229BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ5229BLT1 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…
