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onsemi SZMMBZ5231BLT3G
- Part No.:
- SZMMBZ5231BLT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5231BLT3G.pdf
- Description:
- DIODE ZENER 5.1V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:36,321
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Product details
Overview
SZMMBZ5231BLT3G from onsemi is a 5.1 V, 225 mW Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers ±5% Zener voltage tolerance at 20 mA test current, exhibits 17 Ω dynamic impedance, and supports ≤5 µA reverse leakage at 2 V, making it suitable for power rail clamping in portable battery-powered systems.
For engineers reviewing the SZMMBZ5231BLT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, low dynamic impedance for stable regulation, AEC-Q101 qualification for automotive use, and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal shunt regulator, conducting in reverse breakdown to clamp voltage across its cathode-anode terminals. Its 5.1 V nominal Zener voltage is specified at IZT = 20 mA with temperature coefficient near zero (≈0 mV/°C), enabling stable reference performance across −65°C to +150°C junction range.
The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), with thermal resistance of 556°C/W on FR-5 board. It achieves Class 3 ESD robustness (>16 kV HBM) and complies with AEC-Q101 for automotive applications, distinguishing it from non-SZ MMBZ52xx variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.84–5.36 V at 20 mA - ensures tight 5.1 V regulation with ±5% tolerance for stable reference generation |
| Power Dissipation | 225 mW on FR-5 board - supports continuous operation in compact consumer and automotive PCBs without forced cooling |
| Zener Impedance (ZZT) | 17 Ω max at 20 mA - minimizes output voltage variation under load transients for reliable clamping |
| Reverse Leakage (IR) | ≤5 µA at 2 V - reduces standby current loss in battery-critical applications like wearables and telematics |
| ESD Rating | Class 3 (>16 kV HBM) - eliminates need for external ESD protection in handheld and infotainment interfaces |
| Operating Temperature | −65°C to +150°C - enables deployment in under-hood automotive modules and industrial sensor nodes |
| AEC-Q101 Qualified | Yes - certifies reliability for automotive electronics including body control modules and ADAS power domains |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation to enable Zener conduction |
| 2 | No Connection | Floating terminal - must remain unconnected to avoid parasitic coupling or thermal derating impact |
| 3 | Cathode | Connected to regulated voltage rail; carries full Zener current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified and PPAP capable - meets stringent reliability requirements for Tier-1 automotive subsystems |
| Pb-Free and RoHS compliance | Halogen-free/BFR-free construction - satisfies global environmental regulations and lead-free reflow compatibility |
| Low dynamic impedance | 17 Ω maximum at 20 mA - maintains voltage stability under fast load steps in DC-DC feedback paths |
| High ESD immunity | Class 3 (>16 kV HBM) - protects downstream ICs in USB, button, and sensor interface lines without added TVS |
| Thermal performance | 556°C/W RJA on FR-5 - enables 225 mW dissipation in standard PCB layouts without heatsinking |
Applications
| USB Port Overvoltage Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Clamping transient surges on USB VBUS line caused by hot-plug or ESD events in infotainment head units. IC Role / Device Role / Timing Role: Shunt regulator acting as primary overvoltage clamp, placed directly at connector entry point. Use Value: Prevents damage to USB PHY and PMIC by limiting VBUS to ≤5.36 V, leveraging 17 Ω ZZT for rapid response without sacrificing signal integrity. |
Use Scenario: Regulating 5 V supply rail for microcontroller I/O peripherals in door module ECUs exposed to load dump. IC Role / Device Role / Timing Role: Precision voltage reference and transient suppressor for LIN bus transceivers and LED drivers. Use Value: Maintains stable 5.1 V reference under wide temperature swings (−40°C to +125°C ambient), enabled by AEC-Q101 qualification and 0 mV/°C TC near nominal VZ. |
| Portable Medical Sensor Node | Industrial PLC Input Conditioning |
|
Use Scenario: Protecting ADC input of wearable ECG front-end from electrode contact spikes and ESD. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA at 2 V) clamp limiting analog input to safe range before signal conditioning. Use Value: Preserves signal fidelity with minimal offset error due to ultra-low standby current, critical for sub-mV biopotential measurement accuracy. |
Use Scenario: Level-shifting and surge suppression for 24 V digital inputs in factory automation controllers. IC Role / Device Role / Timing Role: Zener-based voltage translator converting 24 V logic to 5 V-compatible levels while absorbing transients. Use Value: Enables direct interfacing with legacy 24 V sensors using only passive components, reducing BOM count versus active level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5231BLT3G | Same electrical specs but not AEC-Q101 qualified; no automotive PPAP support | Limited to commercial/industrial use; unsuitable for automotive production | Select when automotive qualification is unnecessary and cost sensitivity is higher |
| SZMMBZ5232BLT3G | 5.6 V nominal Zener voltage (5.32–5.88 V), 11 Ω ZZT, same package and qualification | Used where higher clamping threshold is required, e.g., 5.5 V logic rails | Choose for designs needing tighter regulation at elevated voltage with identical thermal and reliability profile |
Compared with MMBZ5231BLT3G, SZMMBZ5231BLT3G adds AEC-Q101 compliance and automotive traceability, while SZMMBZ5232BLT3G offers higher voltage clamping with lower dynamic impedance-enabling optimized trade-offs between protection threshold and regulation stability.
Availability
SZMMBZ5231BLT3G is available at Aetrix Electronics and suitable for automotive electronics, portable medical devices, and industrial sensor interfaces requiring stable component supply with full lifecycle traceability and AEC-Q101 assurance.
Supply support for SZMMBZ5231BLT3G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ52xxBLT3G belongs to onsemi's automotive-qualified Zener regulator family, engineered specifically for voltage reference, overvoltage protection, and ESD suppression in harsh-environment electronic control units.
FAQ
What is the Zener voltage tolerance of SZMMBZ5231BLT3G?
The SZMMBZ5231BLT3G has a Zener voltage range of 4.84 V to 5.36 V at 20 mA test current, corresponding to a ±5% tolerance around the nominal 5.1 V rating. This tight tolerance ensures predictable clamping behavior in precision voltage reference and protection circuits, and is verified per onsemi's MMBZ52xxBLT1G Series datasheet Rev. 16.
Is SZMMBZ5231BLT3G suitable for automotive applications?
Yes, SZMMBZ5231BLT3G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including body control modules, infotainment systems, and ADAS power domains. The "SZ" prefix explicitly denotes automotive-grade process control, site-specific change management, and extended reliability validation beyond commercial-grade MMBZ5231BLT3G.
What is the pin configuration of SZMMBZ5231BLT3G?
SZMMBZ5231BLT3G uses the SOT-23 package with pin 1 as anode, pin 2 as no connection (NC), and pin 3 as cathode - confirmed in the Mechanical Characteristics section and Pinout diagram (Style 8) of the official onsemi datasheet. Pin 2 must remain unconnected to preserve thermal and electrical performance.
How does the dynamic impedance of SZMMBZ5231BLT3G affect regulation performance?
The SZMMBZ5231BLT3G has a maximum Zener impedance (ZZT) of 17 Ω at 20 mA, which directly determines how tightly it maintains 5.1 V under varying load currents. Lower ZZT minimizes output voltage deviation during transient load steps - critical for stabilizing feedback nodes in DC-DC converters and protecting sensitive analog inputs in the SZMMBZ5231BLT3G's target applications.
What packaging options are available for SZMMBZ5231BLT3G?
SZMMBZ5231BLT3G is supplied in 10,000-piece tape-and-reel format (SOT-23, Pb-free), as specified in the Ordering Information table of the onsemi datasheet. This large-reel configuration supports high-volume automated assembly for automotive and industrial manufacturing, and is distinct from the 3,000-piece reel used for the LT1G variant.
SZMMBZ5231BLT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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)
SZMMBZ5231BLT3G FAQ
1.How can I place an order for SZMMBZ5231BLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5231BLT3G 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 SZMMBZ5231BLT3G reliable?
The price and inventory of SZMMBZ5231BLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5231BLT3G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5231BLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5231BLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5231BLT3G?
SZMMBZ5231BLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5231BLT3G 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 SZMMBZ5231BLT3G?
For technical support, including SZMMBZ5231BLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5231BLT3G requirements.
6.How does Aetrix verify that SZMMBZ5231BLT3G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5231BLT3G 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 SZMMBZ5231BLT3G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5231BLT3G?
All SZMMBZ5231BLT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5231BLT3G, 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 SZMMBZ5231BLT3G part is unused and in its original packaging.
Return procedure for SZMMBZ5231BLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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