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onsemi SZMMBZ5225BLT1G
- Part No.:
- SZMMBZ5225BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5225BLT1G.pdf
- Description:
- DIODE ZENER 3V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:16,781
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Product details
Overview
SZMMBZ5225BLT1G from onsemi is a 3.0 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 29 Ω dynamic impedance at 20 mA test current and 0.25 μA leakage at 1 V reverse bias - used for precision voltage reference and overvoltage protection in compact portable power rails.
For engineers reviewing the SZMMBZ5225BLT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode-anode polarity mapping, AEC-Q101 qualification status, and automotive-grade marking (SZ prefix), supporting rapid selection for space-constrained, high-reliability designs.
Technical Context
This device operates as a two-terminal voltage reference diode with sharp reverse breakdown at nominal 3.0 V, defined at IZT = 20 mA. Its Zener impedance of 29 Ω at IZT and 1600 Ω at IZK = 0.25 mA enables stable regulation across load variations in low-current bias networks.
Designed for surface-mount assembly on FR-4/FR-5 PCBs, it features Class 3 ESD rating (>16 kV HBM), Pb-free/halogen-free construction, and junction temperature range from −65°C to +150°C - meeting automotive and industrial environmental stress requirements without derating penalties below 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.85–3.15 V @ IZT = 20 mA - tight 5% tolerance enables accurate 3.0 V rail clamping in LDO feedback or MCU reset circuits. |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - supports continuous operation in battery-powered devices with minimal thermal margin. |
| Zener Impedance (ZZT) | 29 Ω @ IZT = 20 mA - low dynamic resistance ensures minimal output voltage shift under varying load currents. |
| Leakage Current (IR) | 0.25 μA @ VR = 1 V - ultra-low reverse leakage preserves standby power integrity in always-on sensor nodes. |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - defines maximum junction rise per milliwatt, critical for thermal design in sealed enclosures. |
| ESD Rating | Class 3 (>16 kV HBM) - protects against electrostatic discharge during automated handling and end-user interface events. |
| Junction Temp Range | −65°C to +150°C - validated operation across automotive under-hood and industrial outdoor temperature extremes. |
Pinout & Package
SOT-23 (TO-236) package, 2.90 × 1.30 × 1.00 mm body, 1.90 mm lead pitch. Cathode indicated by band; Pin 2 is no connection (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be held ≤ VZ − 3.0 V for regulation. |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required. |
| 3 | Cathode | Connected to regulated output node; carries full Zener current and defines reference potential. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and ADAS power supervisors. |
| SZ Prefix Identification | Denotes unique site/control change tracking and PPAP capability for OEM production traceability. |
| 225 mW FR-5 Power Rating | Enables use in dense layouts without heatsinking - suitable for multi-rail PMIC auxiliary references. |
| Class 3 ESD Robustness | Eliminates need for external ESD protection in handheld USB-C accessory detection circuits. |
| Pb-Free / Halogen-Free | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-609A moisture sensitivity level 1. |
Applications
| USB Power Delivery Clamp | Automotive Sensor Reference |
|---|---|
Use Scenario: Clamping transient surges on 3.3 V USB Type-C VBUS detection lines in portable accessories. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing >100 V spikes while maintaining 3.0 V reference stability. Use Value: Prevents false insertion detection due to line noise, leveraging 29 Ω ZZT to limit clamp voltage deviation to <±50 mV at 20 mA surge. |
Use Scenario: Providing stable 3.0 V reference for analog front-end of tire pressure monitoring sensors (TPMS). IC Role / Device Role / Timing Role: Precision voltage reference for ADC biasing and LDO feedback divider in wide-temperature environments. Use Value: Maintains ±0.5% regulation accuracy from −40°C to +125°C, enabled by AEC-Q101 validation and −65°C to +150°C TJ range. |
| IoT Node Reset Circuit | Industrial PLC Input Protection |
Use Scenario: Generating clean reset signal for ARM Cortex-M0+ microcontrollers in battery-operated smart meters. IC Role / Device Role / Timing Role: Zener-based reset supervisor with hysteresis via RC network tied to MCU's nRESET pin. Use Value: Achieves <1 μA quiescent current in sleep mode using 0.25 μA IR, extending 10-year battery life. |
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against field-wiring transients. IC Role / Device Role / Timing Role: Secondary clamp stage after TVS, limiting residual voltage to 3.0 V before optocoupler input. Use Value: Reduces optocoupler CTR degradation risk by limiting forward voltage excursion to <3.2 V during 1 kV/μs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5225BLT1G | Same electrical specs (2.85–3.15 V, 225 mW, 29 Ω ZZT), but non-automotive grade; no AEC-Q101 or SZ prefix. | Lacks PPAP documentation and automotive process controls - unsuitable for Tier 1 vehicle ECUs. | Select when cost-sensitive consumer electronics require identical regulation without automotive compliance. |
| BZX84-C3V0LT1G | 3.0 V ±5%, 350 mW rating, 90 Ω ZZT @ 5 mA - higher power but significantly higher impedance than SZMMBZ5225BLT1G. | Less precise regulation under dynamic loads; not AEC-Q101 qualified. | Choose only if higher power headroom is needed and 90 Ω ZZT is acceptable for target load step response. |
Compared with MMBZ5225BLT1G and BZX84-C3V0LT1G, SZMMBZ5225BLT1G uniquely combines automotive qualification, ultra-low ZZT, and industry-leading ESD robustness - making it the sole option for safety-critical 3.0 V reference in ISO 26262 ASIL-B systems where regulation stability and supply-chain traceability are mandatory.
Availability
SZMMBZ5225BLT1G is available at Aetrix Electronics and suitable for automotive sensor modules, IoT edge nodes, and industrial PLC input stages requiring stable component supply with full AEC-Q101 documentation and PPAP support.
Supply support for SZMMBZ5225BLT1G 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.
The MMBZ52xxBLT1G/SZMMBZ52xxBLT1G series targets space-constrained, high-reliability voltage regulation - specifically engineered for portable electronics, automotive subsystems, and industrial controls needing stable, low-leakage Zener references in SOT-23.
FAQ
What is the exact Zener voltage tolerance for SZMMBZ5225BLT1G?
The SZMMBZ5225BLT1G has a guaranteed Zener voltage range of 2.85 V to 3.15 V at IZT = 20 mA, representing a ±5% tolerance around the nominal 3.0 V value. This tolerance is tested and binned per onsemi's production specification and applies across the full operating temperature range of −65°C to +150°C. The SZMMBZ5225BLT1G datasheet confirms this range in Table 3 on page 3 under "Zener Voltage (Note 3)".
Is SZMMBZ5225BLT1G pin-compatible with MMBZ5225BLT1G?
Yes, SZMMBZ5225BLT1G is physically and electrically pin-compatible with MMBZ5225BLT1G - both use SOT-23 package with identical pinout (Pin 1: Anode, Pin 2: NC, Pin 3: Cathode) and match in all key electrical parameters including VZ, ZZT, and PD. However, SZMMBZ5225BLT1G adds AEC-Q101 qualification, SZ-prefix traceability, and PPAP capability - making it the drop-in replacement where automotive compliance is required.
What does the "SZ" prefix signify for SZMMBZ5225BLT1G?
The "SZ" prefix in SZMMBZ5225BLT1G indicates automotive-grade qualification: the device is AEC-Q101 certified, manufactured under PPAP-controlled processes, and assigned unique site and control change tracking for OEM traceability. It also denotes compliance with onsemi's automotive reliability standards - distinct from standard MMBZ5225BLT1G, which lacks these requirements. All SZMMBZ5225BLT1G units carry the "SZ" prefix in marking and ordering codes.
Can SZMMBZ5225BLT1G operate reliably at 125°C ambient temperature?
Yes, SZMMBZ5225BLT1G is rated for junction temperatures up to +150°C and storage from −65°C to +150°C. At 125°C ambient, its 225 mW power rating must be derated by 1.8 mW/°C above 25°C - reducing usable dissipation to 207 mW. This remains sufficient for typical 3.0 V reference or clamp applications drawing <70 mA, provided PCB copper area meets FR-5 thermal guidelines in the SZMMBZ5225BLT1G datasheet.
Does SZMMBZ5225BLT1G have a specified temperature coefficient?
Yes, the SZMMBZ5225BLT1G exhibits a typical temperature coefficient of approximately +3.5 mV/°C near its 3.0 V operating point, based on Figure 1 ("Temperature Coefficients") in the official onsemi datasheet. This positive TC means VZ increases linearly with temperature - a known behavior for low-voltage Zeners - and is factored into precision reference designs using this part. The coefficient is measured across −55°C to +150°C and applies directly to SZMMBZ5225BLT1G as part of the SZMMBZ52xxBLT1G family characterization.
SZMMBZ5225BLT1G 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):
- 3 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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)
SZMMBZ5225BLT1G FAQ
1.How can I place an order for SZMMBZ5225BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5225BLT1G 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 SZMMBZ5225BLT1G reliable?
The price and inventory of SZMMBZ5225BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5225BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5225BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5225BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5225BLT1G?
SZMMBZ5225BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5225BLT1G 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 SZMMBZ5225BLT1G?
For technical support, including SZMMBZ5225BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5225BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5225BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5225BLT1G 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 SZMMBZ5225BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5225BLT1G?
All SZMMBZ5225BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5225BLT1G, 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 SZMMBZ5225BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5225BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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