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onsemi SZMMBZ5240BLT1
- Part No.:
- SZMMBZ5240BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5240BLT1.pdf
- Description:
- DIODE ZENER 10V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:45,000
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Product details
Overview
SZMMBZ5240BLT1 from onsemi is a 10 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 at IZT, and supports ≤3 μA reverse leakage at 8 V, making it suitable for battery-powered portable electronics and voltage reference circuits.
For engineers reviewing the SZMMBZ5240BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, low dynamic impedance at nominal test current, thermal resistance on FR-5 board (556 °C/W), ESD robustness (>16 kV HBM), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity, where regulation occurs under reverse bias above the specified Zener breakdown voltage. Its 10 V nominal Zener voltage (9.5–10.5 V range) is stabilized by silicon junction design optimized for low temperature coefficient and minimal voltage drift across −65 °C to +150 °C operating range.
The SOT-23 package features a no-connect (NC) terminal (Pin 2), enabling mechanical stability without electrical function-distinct from dual-diode or dual-Zener configurations. Thermal performance is defined for FR-5 board mounting (225 mW @ 25 °C, derated 1.8 mW/°C), with junction-to-ambient thermal resistance of 556 °C/W confirming suitability for low-power, thermally isolated applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.5–10.5 V at 20 mA test current - defines stable regulation window for 10 V reference designs |
| Power Dissipation | 225 mW on FR-5 board @ 25 °C - sets maximum continuous power handling in standard PCB layout |
| Zener Impedance (ZZT) | 17 Ω @ IZT = 20 mA - determines output voltage stability under load current variation |
| Reverse Leakage (IR) | ≤3 μA @ VR = 8 V - ensures minimal quiescent current in standby or low-power modes |
| ESD Rating | Class 3 (>16 kV) per HBM - guarantees robustness against electrostatic discharge during assembly and operation |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - quantifies self-heating impact under sustained DC bias conditions |
| Junction Temperature Range | −65 °C to +150 °C - enables deployment in extended-temperature industrial and automotive environments |
Pinout & Package
Package: SOT-23 (Case 318, Style 8), surface-mount plastic package with void-free transfer-molded construction, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode identified by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration |
| 2 | No Connection (NC) | Mechanical support only; must remain unconnected in PCB layout to avoid parasitic coupling or shorting |
| 3 | Cathode | Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and infotainment power rails |
| Pb-Free Packaging | SZ prefix and "G" suffix indicate RoHS-compliant, lead-free termination compatible with modern reflow profiles |
| Low Dynamic Impedance | 17 Ω at 20 mA ensures <±10 mV output shift under ±1 mA load transients in reference circuits |
| High ESD Robustness | >16 kV HBM rating eliminates need for external ESD protection in handheld device front-end stages |
| Small Form Factor | SOT-23 footprint (2.9 mm × 1.3 mm) enables placement in high-density layouts such as smartphone PMIC decoupling networks |
Applications
| Battery Voltage Monitoring | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage in portable medical devices to trigger low-battery alerts before cutoff. IC Role / Device Role / Timing Role: Precision 10 V reference for ADC input scaling and comparator threshold setting. Use Value: Tight 9.5–10.5 V tolerance and low 3 μA leakage preserve battery life while ensuring accurate state-of-charge reporting. |
Use Scenario: Protecting USB 2.0 data lines and VBUS rail from transient overvoltage events in docking stations. IC Role / Device Role / Timing Role: Fast-acting shunt clamp that conducts above 10.5 V to divert surge energy to ground. Use Value: 17 Ω Zener impedance limits clamping voltage overshoot during 10/1000 μs transients, preserving signal integrity. |
| Automotive Cabin Controller Reference | Industrial Sensor Signal Conditioning |
|
Use Scenario: Providing stable 10 V reference for analog sensor interfaces in HVAC control modules exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Primary voltage reference for op-amp gain-setting and sensor excitation circuitry. Use Value: AEC-Q101 qualification and −65 °C to +150 °C operation ensure long-term stability across thermal cycling in vehicle cabins. |
Use Scenario: Biasing bridge-based pressure sensors in factory automation systems requiring millivolt-level accuracy. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source for Wheatstone bridge excitation. Use Value: 556 °C/W thermal resistance minimizes self-heating-induced drift, maintaining <0.01 %/°C reference stability. |
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-C10LT1G | 10 V ±5%, 350 mW rating, 20 Ω ZZT @ 5 mA, no AEC-Q101 qualification | Lacks automotive qualification; higher ZZT reduces regulation precision at low currents | Preferred for cost-sensitive consumer electronics where AEC-Q101 is not required |
| MMSZ5240ET1G | 10 V ±5%, 500 mW rating, 15 Ω ZZT @ 20 mA, same SOT-23 package, AEC-Q101 qualified | Higher power rating allows greater surge handling but requires thermal derating verification in dense layouts | Selected when higher transient energy absorption or improved low-current regulation is needed |
Compared with SZMMBZ5240BLT1, BZX84-C10LT1G offers lower cost but lacks automotive qualification and has higher impedance at typical operating currents, while MMSZ5240ET1G provides superior power handling and marginally lower impedance but demands careful thermal layout validation due to its 500 mW rating.
Availability
SZMMBZ5240BLT1 is available at Aetrix Electronics and suitable for battery management systems, USB interface protection, automotive cabin controllers, and industrial sensor signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SZMMBZ5240BLT1 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5240BLT1 belongs to the MMBZ52xxBLT1/SZMMBZ52xxBLT1G series of Zener regulators engineered for compact, high-reliability voltage reference and overvoltage protection in automotive and portable electronics.
FAQ
What is the Zener voltage tolerance of SZMMBZ5240BLT1?
The SZMMBZ5240BLT1 has a Zener voltage range of 9.5 V to 10.5 V at 20 mA test current, corresponding to ±5% tolerance around the nominal 10 V rating. This tolerance is guaranteed across the full operating temperature range and is verified per onsemi's production testing protocol, ensuring consistent performance in voltage reference and clamping applications.
Is SZMMBZ5240BLT1 suitable for automotive applications?
Yes, SZMMBZ5240BLT1 is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating compliance for automotive and other applications requiring unique site and control change requirements. Its −65 °C to +150 °C junction temperature range and >16 kV HBM ESD rating make it appropriate for under-hood and cabin control modules.
What is the function of Pin 2 on SZMMBZ5240BLT1?
Pin 2 of SZMMBZ5240BLT1 is a no-connect (NC) terminal-electrically isolated and intended solely for mechanical stability in the SOT-23 package. It must not be soldered to any net on the PCB, as connection could introduce parasitic paths or compromise device reliability. The active terminals are Pin 1 (Anode) and Pin 3 (Cathode).
How does the thermal resistance of SZMMBZ5240BLT1 affect its use in FR-5 PCBs?
SZMMBZ5240BLT1 has a junction-to-ambient thermal resistance of 556 °C/W on FR-5 board. At its rated 225 mW dissipation, this results in ~125 °C junction rise above ambient-requiring ambient temperature limits below 25 °C for safe operation at full power. Designers must apply derating (1.8 mW/°C above 25 °C) to maintain reliability in enclosed or high-temperature environments.
Does SZMMBZ5240BLT1 have Pb-free packaging?
Yes, SZMMBZ5240BLT1 is supplied in a Pb-free package compliant with RoHS Directive 2011/65/EU. The "SZ" prefix and absence of non-RoHS indicators confirm lead-free terminations and mold compound, validated for compatibility with standard SnAgCu reflow profiles up to 260 °C for 10 seconds.
SZMMBZ5240BLT1 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):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 8 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)
SZMMBZ5240BLT1 FAQ
1.How can I place an order for SZMMBZ5240BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5240BLT1 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 SZMMBZ5240BLT1 reliable?
The price and inventory of SZMMBZ5240BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5240BLT1 is usually 5 days.
3.What payment methods are accepted for SZMMBZ5240BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5240BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5240BLT1?
SZMMBZ5240BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5240BLT1 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 SZMMBZ5240BLT1?
For technical support, including SZMMBZ5240BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5240BLT1 requirements.
6.How does Aetrix verify that SZMMBZ5240BLT1 is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5240BLT1 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 SZMMBZ5240BLT1 meets industry standards.
7.What is the process for return or replacement of SZMMBZ5240BLT1?
All SZMMBZ5240BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5240BLT1, 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 SZMMBZ5240BLT1 part is unused and in its original packaging.
Return procedure for SZMMBZ5240BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ5240BLT1 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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