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onsemi SZMMBZ5241BLT1
- Part No.:
- SZMMBZ5241BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5241BLT1.pdf
- Description:
- DIODE ZENER 11V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:42,000
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Product details
Overview
SZMMBZ5241BLT1 from onsemi is a 11 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers 11.0 V nominal Zener voltage at 20 mA test current, with ±5% tolerance (10.4–11.55 V), 22 Ω dynamic impedance at IZT, and 2 µA reverse leakage at 8.4 V, supporting use in portable power rails and ESD-sensitive signal conditioning.
For engineers reviewing the SZMMBZ5241BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q101 qualification, Class 3 HBM ESD rating (>16 kV), Pb-free SOT-23 package, and verified 11 V regulation performance across −65°C to +150°C junction temperature range.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to clamp voltage at its specified Zener level. Its SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), enabling unidirectional regulation without series resistance dependency for low-current biasing.
Thermal design is constrained by 556°C/W junction-to-ambient thermal resistance on FR-5 board and 417°C/W on alumina substrate. The −65°C to +150°C operating range and 225 mW power rating at 25°C (derated linearly above) define its safe operating envelope in thermally dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.0 V nominal (10.4–11.55 V min/max), stable regulation point for 12 V rail clamping or reference generation |
| Power Dissipation | 225 mW on FR-5 board at 25°C; derates 1.8 mW/°C above ambient - limits continuous current to ~20 mA at room temp |
| Zener Impedance (ZZT) | 22 Ω at 20 mA test current - ensures <0.22 V output variation per 1 mA load change near regulation point |
| Reverse Leakage (IR) | 2 µA max at 8.4 V - enables low-quiescent monitoring of supply integrity without loading source |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - supports direct placement on I/O lines in handheld devices |
| Junction Temp Range | −65°C to +150°C - validated for under-hood automotive and industrial environments without derating |
| AEC-Q101 Qualified | Qualified for automotive applications - meets stress testing requirements for temperature cycling, humidity, and mechanical shock |
Pinout & Package
Package: SOT-23 (Case 318, Style 8), surface-mount plastic case with corrosion-resistant finish, UL 94 V-0 flammability rating, and 260°C soldering tolerance for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node; reverse-biased during regulation - must be held ≤ VZ below cathode |
| Pin 2 | No Connection | Internally isolated; no PCB trace or pad required - reduces routing complexity and avoids accidental shorts |
| Pin 3 | Cathode | Connected to regulated voltage node; carries full Zener current during clamping - routed with adequate copper area |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock testing |
| Class 3 HBM ESD protection | Withstands >16 kV electrostatic discharge - eliminates need for external TVS in many I/O protection schemes |
| Pb-free SOT-23 packaging | RoHS-compliant construction with void-free transfer-molded thermoset plastic and easily solderable finish |
| Low leakage at sub-Zener voltage | 2 µA max IR at 8.4 V enables high-impedance sensing of supply health without loading circuit |
| Stable regulation across wide temp range | Specified performance maintained from −65°C to +150°C - suitable for engine control and outdoor electronics |
Applications
| Automotive Body Control Module | USB-C Power Delivery Monitor |
|---|---|
|
Use Scenario: Regulating auxiliary 12 V supply rail in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Voltage clamp protecting MCU VDD against load-dump transients up to 24 V. Use Value: Maintains 11 V regulation with 22 Ω impedance to limit transient overshoot to <±0.44 V per 20 mA surge, preventing brownout resets. |
Use Scenario: Reference voltage source for ADC measuring USB-C VBUS during PD negotiation. IC Role / Device Role / Timing Role: Precision 11 V Zener reference feeding resistive divider to scale 20 V VBUS down to 3.3 V ADC input. Use Value: 10.4–11.55 V tolerance and <2 µA leakage ensure <0.5% measurement error across temperature and aging. |
| Industrial Sensor Signal Conditioning | Portable Medical Device Battery Monitor |
|
Use Scenario: Biasing op-amp input stage in 4–20 mA transmitter loop powered from 24 V supply. IC Role / Device Role / Timing Role: Shunt regulator establishing stable 11 V local reference for current-loop DAC and amplifier biasing. Use Value: 225 mW rating and 556°C/W RJA allow continuous operation at 20 mA without heatsinking in compact enclosures. |
Use Scenario: Overvoltage protection for lithium-ion battery pack monitoring IC powered from cell stack. IC Role / Device Role / Timing Role: Clamping cell voltage measurement node to prevent damage during charging faults. Use Value: AEC-Q101 qualification and −65°C to +150°C range support reliable operation in implantable and wearable form factors. |
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-C11LT1G | 11 V nominal, 350 mW rating, 30 Ω ZZT, non-AEC-Q101, same SOT-23 package | Lacks automotive qualification and Class 3 ESD rating; higher power but less precise regulation | Select when cost sensitivity outweighs automotive compliance and tighter impedance is not required. |
| MMSZ5241ET1G | 11 V nominal, 500 mW rating, 20 Ω ZZT, AEC-Q101 qualified, same SOT-23 footprint | Higher power handling and marginally lower impedance, but larger thermal mass affects transient response | Prefer for designs requiring >225 mW dissipation or where 20 Ω vs. 22 Ω ZZT improves ADC reference stability. |
Compared with BZX84-C11LT1G and MMSZ5241ET1G, SZMMBZ5241BLT1 offers the optimal balance of AEC-Q101 compliance, Class 3 ESD robustness, and 225 mW thermal profile for space-constrained automotive and portable applications where 22 Ω ZZT meets regulation accuracy needs.
Availability
SZMMBZ5241BLT1 is available at Aetrix Electronics and suitable for automotive body control modules, USB-C power delivery monitors, industrial sensor transmitters, and portable medical battery monitors requiring stable component supply with full traceability and lifecycle management.
Supply support for SZMMBZ5241BLT1 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 specializing in energy-efficient power, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
SZMMBZ5241BLT1 belongs to the MMBZ52xxBLT1/SZMMBZ52xxBLT1G Zener regulator family, engineered for high-density surface-mount voltage reference and protection in automotive, portable, and industrial systems where small size and reliability are critical.
FAQ
What is the Zener voltage tolerance of SZMMBZ5241BLT1?
The SZMMBZ5241BLT1 has a nominal Zener voltage of 11.0 V with a tolerance of ±5%, resulting in a guaranteed range of 10.4 V to 11.55 V at 20 mA test current and 25°C ambient temperature. This tolerance is fully specified in the Electrical Characteristics table of the official onsemi datasheet and applies across the full operating temperature range.
Is SZMMBZ5241BLT1 pin-compatible with standard SOT-23 Zener diodes?
Yes, SZMMBZ5241BLT1 uses the standard SOT-23 (Case 318) package with Pin 1 = Anode, Pin 2 = No Connection, and Pin 3 = Cathode - matching industry-standard pinout for dual-terminal Zeners in this footprint. This allows direct substitution in existing layouts designed for compatible SOT-23 Zeners like BZX84-C11LT1G or MMSZ5241ET1G.
Does SZMMBZ5241BLT1 require a series current-limiting resistor in all applications?
Yes, SZMMBZ5241BLT1 requires an external series resistor to limit reverse current to within its 225 mW power rating and prevent thermal runaway. For example, at 20 mA regulation current and 24 V supply, a minimum 650 Ω resistor is needed. The resistor value must be calculated based on worst-case supply voltage, Zener voltage, and desired operating current.
What is the maximum reverse leakage current for SZMMBZ5241BLT1 at 8.4 V?
The maximum reverse leakage current for SZMMBZ5241BLT1 is 2 µA at 8.4 V (VR = 8.4 V), as specified in the Electrical Characteristics table. This low leakage enables high-impedance voltage monitoring and minimizes parasitic loading in precision reference and sensing circuits.
Can SZMMBZ5241BLT1 be used in automotive under-hood applications?
Yes, SZMMBZ5241BLT1 is AEC-Q101 qualified and rated for junction temperatures from −65°C to +150°C, making it suitable for under-hood automotive applications such as engine control units and body control modules where thermal and reliability demands are stringent. Its Class 3 HBM ESD rating further supports robustness in noisy vehicle electrical environments.
SZMMBZ5241BLT1 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):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 8.4 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)
SZMMBZ5241BLT1 FAQ
1.How can I place an order for SZMMBZ5241BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5241BLT1 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 SZMMBZ5241BLT1 reliable?
The price and inventory of SZMMBZ5241BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5241BLT1 is usually 5 days.
3.What payment methods are accepted for SZMMBZ5241BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5241BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5241BLT1?
SZMMBZ5241BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5241BLT1 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 SZMMBZ5241BLT1?
For technical support, including SZMMBZ5241BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5241BLT1 requirements.
6.How does Aetrix verify that SZMMBZ5241BLT1 is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5241BLT1 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 SZMMBZ5241BLT1 meets industry standards.
7.What is the process for return or replacement of SZMMBZ5241BLT1?
All SZMMBZ5241BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5241BLT1, 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 SZMMBZ5241BLT1 part is unused and in its original packaging.
Return procedure for SZMMBZ5241BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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