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onsemi SZMMBZ5231BLT1G
- Part No.:
- SZMMBZ5231BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5231BLT1G.pdf
- Description:
- DIODE ZENER 5.1V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:58,914
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Product details
Overview
SZMMBZ5231BLT1G from onsemi is a 5.1 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 17 Ω dynamic impedance at 20 mA test current and 5 μA reverse leakage at 2 V, used for voltage regulation in space-constrained portable electronics.
For engineers reviewing the SZMMBZ5231BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), AEC-Q101 qualification, and SOT-23 footprint compatibility in high-density PCB designs.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at its nominal Zener voltage of 5.1 V with ±5% tolerance. It exhibits low dynamic impedance (17 Ω at IZT = 20 mA) and tight leakage control (5 μA max at VR = 2 V).
Designed for surface-mount assembly on FR-4/FR-5 boards, it delivers stable regulation across −65 °C to +150 °C junction temperature range and meets Class 3 ESD immunity (>16 kV per HBM). The SOT-23 package features cathode polarity marking and Pb-free, RoHS-compliant construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V nominal, min 4.84 V / max 5.36 V at IZT = 20 mA - defines precise clamping threshold for 5 V rail protection |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25 °C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZT) | 17 Ω max at IZT = 20 mA - ensures minimal voltage deviation under load transients |
| Reverse Leakage (IR) | 5 μA max at VR = 2 V - guarantees low standby current in undervoltage detection circuits |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - determines junction temperature rise per milliwatt dissipated |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust operation in handheld ESD-prone environments |
| AEC-Q101 Qualified | Yes - confirms suitability for automotive electronic modules requiring stress-tested reliability |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant finish and UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias regulation configuration |
| 2 - No Connection | Internal isolation | Unbonded die pad; must remain unconnected on PCB to avoid parasitic coupling |
| 3 - Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated rail; polarity band on package identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables compact voltage clamping without heatsinking in thin-profile portable PCBs |
| 17 Ω Zener impedance at 20 mA | Minimizes output voltage variation during 10–100 mA load steps in feedback-sensing applications |
| Easily solderable corrosion-resistant finish | Supports reliable reflow and hand-soldering with no post-process cleaning required |
| AEC-Q101 qualification and PPAP capability | Validates production readiness for automotive infotainment and body control module designs |
| Pb-free, halogen-free/BFR-free, RoHS compliant | Meets global environmental compliance mandates without performance trade-offs |
Applications
| USB Port Overvoltage Protection | Automotive Cabin Sensor Reference |
|---|---|
Use Scenario: Clamping transient surges on USB 2.0 data lines and VBUS during hot-plug events in portable docking stations. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fast-response voltage limiting independent of system clock or controller. Use Value: Prevents damage to USB PHY ICs by holding line voltage ≤5.36 V during 100 ns–1 μs ESD events per IEC 61000-4-2 Level 4. |
Use Scenario: Supplying stable 5.1 V reference to analog signal conditioning circuitry in HVAC sensor nodes within vehicle cabins. IC Role / Device Role / Timing Role: Passive voltage reference establishing precision bias point for op-amp input stages and ADC front-ends. Use Value: Maintains <±1% reference stability over −40 °C to +85 °C ambient with <5 μA leakage, reducing calibration drift in temperature-compensated sensors. |
| Smartphone Battery Management | Industrial IoT Edge Node Power Supervision |
Use Scenario: Monitoring battery pack voltage via resistive divider into microcontroller ADC, with overvoltage cutoff triggered at 4.35 V. IC Role / Device Role / Timing Role: Zener-based comparator threshold generator enabling hardware-level cell overvoltage lockout. Use Value: Delivers deterministic 4.84–5.36 V trip window with no external supply or timing components, cutting response latency to <100 ns. |
Use Scenario: Detecting brown-out conditions on 3.3 V MCU rails in wireless sensor nodes powered by energy-harvesting sources. IC Role / Device Role / Timing Role: Low-power shunt element in resistor-Zener reset supervisor circuit. Use Value: Draws only 5 μA at 2 V bias, extending battery life >2 years in sleep-mode operation while ensuring reliable 3.0 V reset assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C5V1LT1G | Same 5.1 V nominal, but 350 mW rating and 60 Ω ZZT; not AEC-Q101 qualified | Lacks automotive qualification and higher impedance reduces regulation accuracy under dynamic loads | Prefer SZMMBZ5231BLT1G where AEC-Q101 compliance or tighter Zener impedance is required |
| MMSZ5231ET1G | Identical 5.1 V spec, but 500 mW rating and 17 Ω ZZT; RoHS compliant but not explicitly AEC-Q101 certified | Higher power rating allows use in higher-current shunt configurations, but lacks PPAP documentation for automotive release | Select SZMMBZ5231BLT1G when full automotive traceability and PPAP support are mandatory |
Compared with BZX84-C5V1LT1G and MMSZ5231ET1G, SZMMBZ5231BLT1G uniquely combines AEC-Q101 qualification, 17 Ω Zener impedance, and documented PPAP capability-making it the only choice for production automotive modules requiring auditable process control and thermal reliability at 225 mW.
Availability
SZMMBZ5231BLT1G is available at Aetrix Electronics and suitable for USB protection circuits, automotive cabin sensors, smartphone battery management systems, and industrial IoT edge node supervision requiring stable component supply and automotive-grade traceability.
Supply support for SZMMBZ5231BLT1G 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.
SZMMBZ5231BLT1G belongs to the SZMMBZ52xxBLT1G series of AEC-Q101-qualified Zener diodes engineered specifically for automotive and high-reliability portable electronics needing compact, robust voltage regulation.
FAQ
What is the Zener voltage tolerance of SZMMBZ5231BLT1G?
The SZMMBZ5231BLT1G has a Zener voltage tolerance of ±5% around its nominal 5.1 V rating, meaning the actual measured VZ falls between 4.84 V and 5.36 V at IZT = 20 mA and TA = 25 °C. This tolerance is guaranteed per the onsemi datasheet and applies across the full operating temperature range when derated per thermal limits. The SZMMBZ5231BLT1G maintains this specification under AEC-Q101 stress testing.
Is SZMMBZ5231BLT1G suitable for automotive applications?
Yes, SZMMBZ5231BLT1G is explicitly AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-specific site and process controls. It undergoes accelerated stress testing for temperature cycling, humidity, and mechanical shock per automotive standards. Its 150 °C maximum junction temperature and 556 °C/W thermal resistance make SZMMBZ5231BLT1G appropriate for under-hood and cabin modules where thermal margin is critical.
What is the maximum power dissipation of SZMMBZ5231BLT1G on a standard PCB?
SZMMBZ5231BLT1G is rated for 225 mW total power dissipation on FR-5 board at 25 °C ambient, with linear derating of 1.8 mW/°C above that temperature. On alumina substrate, it supports up to 300 mW at 25 °C. The 225 mW rating assumes standard 1.0 × 0.75 × 0.62 inch FR-5 board layout per datasheet Note 1; exceeding this requires thermal modeling or heatsinking. This limit directly governs safe continuous operation of SZMMBZ5231BLT1G in handheld devices.
Does SZMMBZ5231BLT1G have ESD protection built-in?
Yes, SZMMBZ5231BLT1G carries an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM), verified per AEC-Q101 test requirements. This level of immunity enables direct integration into ESD-sensitive interfaces like USB ports and sensor inputs without additional TVS diodes. The robustness stems from optimized junction design and packaging, and is a specified characteristic of every SZMMBZ5231BLT1G unit shipped.
What is the pin configuration of SZMMBZ5231BLT1G?
SZMMBZ5231BLT1G uses the SOT-23 package with pinout: Pin 1 = Anode, Pin 2 = No Connection (unbonded), Pin 3 = Cathode (identified by polarity band). This configuration is confirmed in the onsemi datasheet Mechanical Characteristics section and Style 8 pin mapping. Pin 2 must remain unconnected on PCB layout to prevent unintended coupling or leakage paths in SZMMBZ5231BLT1G applications.
SZMMBZ5231BLT1G 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)
SZMMBZ5231BLT1G FAQ
1.How can I place an order for SZMMBZ5231BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5231BLT1G 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 SZMMBZ5231BLT1G reliable?
The price and inventory of SZMMBZ5231BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5231BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5231BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5231BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5231BLT1G?
SZMMBZ5231BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5231BLT1G 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 SZMMBZ5231BLT1G?
For technical support, including SZMMBZ5231BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5231BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5231BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5231BLT1G 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 SZMMBZ5231BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5231BLT1G?
All SZMMBZ5231BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5231BLT1G, 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 SZMMBZ5231BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5231BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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