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onsemi SZMMBZ5222BLT1G
- Part No.:
- SZMMBZ5222BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5222BLT1G.pdf
- Description:
- DIODE ZENER 2.5V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,227
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Product details
Overview
SZMMBZ5222BLT1G from onsemi is a 2.5 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 1250 Ω maximum dynamic impedance at 20 mA test current and 0.25 μA reverse leakage at 1 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the SZMMBZ5222BLT1G 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 for high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage regulator using avalanche breakdown in silicon PN junction. Its nominal Zener voltage of 2.5 V is specified at 20 mA test current (IZT) with ±5% tolerance, and exhibits a temperature coefficient near zero in this low-voltage range, minimizing drift across −65°C to +150°C operating junction temperature.
The SOT-23 package features a cathode-indicated polarity band, no internal connection on pin 2, and is Pb-free, halogen-free, RoHS-compliant. Thermal performance is defined for FR-5 board (225 mW @ 25°C, derated 1.8 mW/°C) and alumina substrate (300 mW @ 25°C), supporting both consumer and automotive-grade reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.5 V nominal, 2.37–2.63 V min/max at IZT = 20 mA - defines stable regulation point under typical bias |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C - sets maximum continuous DC power handling in standard PCB layout |
| Zener Impedance (ZZT) | 1250 Ω max @ IZT = 20 mA - indicates voltage stability under small-signal AC variation |
| Reverse Leakage (IR) | 0.25 μA max @ VR = 1 V - ensures minimal standby current in clamping or reference circuits |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - supports robust handling in automated assembly and end-use environments |
| Junction Temp Range | −65°C to +150°C - enables operation in extended industrial and automotive under-hood conditions |
| AEC-Q101 Qualified | Yes - confirms stress-tested reliability for automotive electronic control units and infotainment systems |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band; UL 94 V-0 flammability rating; 260°C max soldering temperature for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in Zener regulation or clamping configuration |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Zener breakdown terminal; connects to higher-potential node and carries regulated output or clamped voltage |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 qualified and PPAP capable - meets baseline reliability for Tier-1 automotive subsystems |
| ESD robustness | Class 3 (>16 kV HBM) - eliminates need for external ESD protection in handheld and wearable designs |
| Space-constrained packaging | SOT-23 footprint (2.9 × 1.3 mm) - enables placement in ultra-dense mobile PCBs with <0.65 mm pitch routing |
| Environmental compliance | Pb-free, halogen-free/BFR-free, RoHS compliant - satisfies global regulatory requirements without derating |
| Thermal performance | 556 °C/W junction-to-ambient on FR-5 - allows accurate thermal budgeting in thermally isolated PCB zones |
Applications
| Smartphone Power Rail Clamp | Automotive Cabin Controller Reference |
|---|---|
|
Use Scenario: Clamping transient spikes on 3.3 V I/O rails during hot-plug or ESD events in LTE modem modules. IC Role / Device Role / Timing Role: Two-terminal shunt regulator acting as voltage clamp between rail and ground. Use Value: Limits voltage excursions to ≤2.63 V, protecting downstream 2.5 V logic interfaces without adding series resistance or delay. |
Use Scenario: Providing stable 2.5 V reference for ADC sampling in HVAC control microcontrollers within vehicle cabin ECUs. IC Role / Device Role / Timing Role: Precision voltage reference source with low temperature coefficient near 2.5 V. Use Value: Enables <±1 LSB error in 12-bit ADC conversion across −40°C to +105°C ambient, meeting AEC-Q100 Grade 2 requirements. |
| Wearable Sensor Bias Supply | Industrial IoT Node Voltage Monitor |
|
Use Scenario: Generating low-current bias voltage for MEMS accelerometer analog front-end in battery-powered fitness trackers. IC Role / Device Role / Timing Role: Low-quiescent-current Zener reference supplying 5–10 μA to sensor conditioning circuitry. Use Value: Draws only 0.25 μA leakage at 1 V reverse bias, extending coin-cell battery life beyond 12 months in sleep mode. |
Use Scenario: Monitoring 3.3 V system rail health via comparator input in edge gateway devices deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Overvoltage detection element feeding comparator threshold with predictable 2.5 V trigger point. Use Value: Delivers ±5% voltage accuracy over full temperature range, enabling reliable fault detection without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C2V4LT1G | 2.4 V nominal, ±5% tolerance, 350 mW PD, 600 Ω ZZT @ 5 mA - higher power but looser regulation at low current | Preferred where higher surge energy absorption is needed, but less suitable for precision 2.5 V references | Select when board-level transient immunity > voltage accuracy; verify thermal margin at 350 mW derating |
| SZBZX84C2V7LT1G | 2.7 V nominal, ±5%, AEC-Q101 qualified, 300 mW PD, 1000 Ω ZZT @ 5 mA - 0.2 V higher Zener voltage, tighter ZZK | Used where 2.7 V logic thresholds or higher clamping margin is required in automotive CAN transceiver protection | Choose for 2.7 V systems; not drop-in for 2.5 V designs due to voltage mismatch and different IZT test condition |
Compared with SZMMBZ5222BLT1G, BZX84-C2V4LT1G offers higher power but reduced regulation precision at low currents, while SZBZX84C2V7LT1G shifts the reference point to 2.7 V with improved knee impedance - neither is pin-compatible nor voltage-matched, requiring schematic and layout review for substitution.
Availability
SZMMBZ5222BLT1G is available at Aetrix Electronics and suitable for smartphone power rail protection, automotive cabin controller references, wearable sensor bias supplies, and industrial IoT node voltage monitoring requiring stable component supply across automotive, industrial, and consumer production programs.
Supply support for SZMMBZ5222BLT1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5222BLT1G belongs to the AEC-Q101-qualified SZMMBZ52xxBLT1G Zener regulator family, engineered for automotive-grade reliability and compact voltage reference/clamp functions in space-constrained, high-reliability electronic control units.
FAQ
What is the Zener voltage tolerance of SZMMBZ5222BLT1G?
The SZMMBZ5222BLT1G has a Zener voltage tolerance of ±5% around its nominal 2.5 V rating, meaning the actual measured VZ falls between 2.37 V and 2.63 V when tested at IZT = 20 mA and TA = 25°C. This tolerance remains valid across the full −65°C to +150°C junction temperature range, as confirmed in the onsemi datasheet revision 16.
Is SZMMBZ5222BLT1G suitable for automotive applications?
Yes, SZMMBZ5222BLT1G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including cabin controllers, body electronics, and infotainment systems. Its construction, testing, and traceability meet automotive reliability standards, and the "SZ" prefix explicitly denotes automotive-grade change control and site-specific manufacturing controls.
What is the pin configuration of SZMMBZ5222BLT1G?
SZMMBZ5222BLT1G uses the SOT-23 package with pin 1 as Anode, pin 2 as No Connection (NC), and pin 3 as Cathode - per onsemi's Style 8 mechanical outline. The cathode is marked by a polarity band on the package body, and pin 2 must remain unconnected in PCB layout and schematic symbol.
How does the ESD rating of SZMMBZ5222BLT1G impact system design?
SZMMBZ5222BLT1G has an ESD rating of Class 3 (>16 kV) per Human Body Model, allowing direct integration into handheld and wearable designs without supplemental TVS diodes on low-energy signal lines. This simplifies BOM count and reduces PCB area, especially in space-constrained applications like Bluetooth earbuds or smartwatches where the SZMMBZ5222BLT1G serves as primary ESD clamp.
Can SZMMBZ5222BLT1G replace MMBZ5222BLT1G in existing designs?
Yes, SZMMBZ5222BLT1G is a direct functional and pinout replacement for MMBZ5222BLT1G, sharing identical electrical specifications, SOT-23 package, and pin configuration. The "SZ" prefix adds AEC-Q101 qualification and automotive process controls but maintains full compatibility - no schematic or layout changes are required when upgrading to SZMMBZ5222BLT1G for enhanced reliability.
SZMMBZ5222BLT1G 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):
- 2.5 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 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)
SZMMBZ5222BLT1G FAQ
1.How can I place an order for SZMMBZ5222BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5222BLT1G 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 SZMMBZ5222BLT1G reliable?
The price and inventory of SZMMBZ5222BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5222BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5222BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5222BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5222BLT1G?
SZMMBZ5222BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5222BLT1G 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 SZMMBZ5222BLT1G?
For technical support, including SZMMBZ5222BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5222BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5222BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5222BLT1G 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 SZMMBZ5222BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5222BLT1G?
All SZMMBZ5222BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5222BLT1G, 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 SZMMBZ5222BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5222BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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