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onsemi SZMMBZ5248ELT1G
- Part No.:
- SZMMBZ5248ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5248ELT1G.pdf
- Description:
- DIODE ZENER 18V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SZMMBZ5248ELT1G from onsemi is a 18 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C ambient, with 7 mA test current (IZT), 21 Ω dynamic impedance (ZZT), and 0.1 μA reverse leakage at 14 V (VR). It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the SZMMBZ5248ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), peak pulse power capability (225 W), and AEC-Q101 qualification for automotive use.
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable voltage across its cathode-anode terminals. Its nominal 18 V Zener voltage is specified at IZT = 7 mA with ±5% tolerance, and exhibits a temperature coefficient near +0.055 mV/°C (typical for 18 V devices per Figure 1).
The SOT-23 package features three terminals: anode (Pin 1), no-connect (Pin 2), and cathode (Pin 3), enabling compact placement in space-constrained PCB layouts. Thermal performance is defined for FR-5 board (RJA = 556 °C/W) and alumina substrate (RJA = 417 °C/W), supporting reliable operation from −65°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1 V to 18.9 V @ IZT = 7 mA - defines regulated output voltage range under standard test conditions |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 21 Ω @ IZT = 7 mA - indicates voltage regulation stability under small-signal AC variations |
| Reverse Leakage (IR) | 0.1 μA @ VR = 14 V - ensures minimal standby current in clamping or reference applications |
| ESD Rating | Class 3 (>16 kV) per HBM - provides robustness against electrostatic discharge during handling and assembly |
| Peak Pulse Power | 225 W @ 8 × 20 μs waveform - supports transient overvoltage suppression without failure |
| Junction Temp Range | −65°C to +150°C - enables deployment in extended-temperature automotive and industrial environments |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 mm × 1.30 mm × 1.00 mm body size, Pb-free, RoHS-compliant, with cathode polarity band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias configuration; required for proper Zener conduction path |
| Pin 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad should tie this terminal |
| Pin 3 | Cathode | Connected to higher-potential node; polarity band on package identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per JESD22 standards |
| 225 mW FR-5 Rating | Enables use in high-density portable electronics without forced cooling or oversized copper pours |
| 16 kV HBM ESD Protection | Eliminates need for external ESD protection in handheld and wearable designs with exposed interfaces |
| Low-Leakage Clamping | 0.1 μA IR at 14 V allows integration into battery-powered sensor nodes where quiescent current is critical |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for industrial and consumer end equipment |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for ADC input scaling in door module microcontroller subsystems. IC Role / Device Role / Timing Role: Zener diode providing stable 18 V reference to buffer op-amp driving 12-bit SAR ADC. Use Value: Maintains <±0.5% reference accuracy over −40°C to +125°C ambient due to AEC-Q101 thermal validation and low TC drift. |
Use Scenario: Overvoltage clamp protecting 24 V industrial analog input front-end from transients. IC Role / Device Role / Timing Role: Shunt regulator clamping induced surges above 18.9 V to protect downstream instrumentation amplifier. Use Value: Absorbs 225 W peak pulses per IEC 61000-4-5 Level 3 without degradation, verified by 8 × 20 μs waveform testing. |
| Portable Medical Pulse Oximeter | Smart Home Smoke Detector MCU Supply |
Use Scenario: Precision biasing of red/IR LED drivers requiring stable forward voltage control. IC Role / Device Role / Timing Role: Zener-based current source reference ensuring consistent LED intensity across battery voltage range. Use Value: Delivers <1% regulation error at 7 mA IZT while consuming only 0.1 μA standby leakage-extending coin-cell life. |
Use Scenario: Undervoltage lockout (UVLO) threshold stabilization for lithium-ion backup supply monitoring. IC Role / Device Role / Timing Role: Reference element in comparator circuit triggering system reset below 17.1 V supply rail. Use Value: Tight 17.1–18.9 V tolerance band ensures deterministic reset behavior across production lots and temperature extremes. |
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-C18LT1G | Same 18 V nominal Zener, but 350 mW rating and 40 Ω ZZT @ 5 mA - higher power, lower regulation precision | Preferred for higher-current shunt regulation; less suitable for low-leakage, low-impedance references | Select when >225 mW continuous dissipation is needed and 40 Ω impedance is acceptable |
| SZBZX84C18LT3G | AEC-Q101 qualified like SZMMBZ5248ELT1G, but 300 mW rating and 30 Ω ZZT @ 5 mA - improved thermal margin, moderate impedance | Better suited for automotive load-dump clamping where higher pulse energy absorption is required | Choose when board layout allows larger thermal relief and tighter Zener impedance is not critical |
Compared with BZX84-C18LT1G and SZBZX84C18LT3G, SZMMBZ5248ELT1G offers superior low-current regulation (21 Ω @ 7 mA) and smaller footprint, making it optimal for space-constrained, low-leakage 18 V reference designs where AEC-Q101 compliance is mandatory.
Availability
SZMMBZ5248ELT1G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioners, portable medical devices, and smart home safety systems requiring stable component supply with full AEC-Q101 traceability.
Supply support for SZMMBZ5248ELT1G 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.
SZMMBZ5248ELT1G belongs to the SZMMBZ52xxELT1G series-engineered specifically for automotive and high-reliability applications requiring AEC-Q101 qualification, enhanced process controls, and PPAP documentation support.
FAQ
What is the Zener voltage tolerance of SZMMBZ5248ELT1G?
The SZMMBZ5248ELT1G has a Zener voltage range of 17.1 V to 18.9 V at IZT = 7 mA, corresponding to a ±5% tolerance around the nominal 18 V rating. This tolerance is guaranteed across the full operating temperature range of −65°C to +150°C and is validated per AEC-Q101 stress testing protocols for automotive use.
Is SZMMBZ5248ELT1G pin-compatible with standard MMBZ5248ELT1G?
Yes, SZMMBZ5248ELT1G shares identical SOT-23 pinout (Pin 1: Anode, Pin 2: NC, Pin 3: Cathode), mechanical dimensions, and electrical specifications with MMBZ5248ELT1G. The "SZ" prefix denotes automotive-grade process controls and PPAP capability, not a physical or electrical change-making it a drop-in replacement where AEC-Q101 compliance is required.
What is the maximum reverse leakage current for SZMMBZ5248ELT1G?
The maximum reverse leakage current for SZMMBZ5248ELT1G is 0.1 μA at VR = 14 V and TA = 25°C. This value is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet and remains stable across the full storage temperature range, supporting ultra-low-power design goals.
Can SZMMBZ5248ELT1G be used in high-density PCB layouts?
Yes, SZMMBZ5248ELT1G uses the compact SOT-23 (2.90 mm × 1.30 mm) package optimized for automated assembly and high-density routing. Its 225 mW FR-5 power rating and low thermal resistance (556 °C/W) allow placement adjacent to heat-sensitive components without thermal derating concerns in typical 1–2 layer boards.
Does SZMMBZ5248ELT1G meet automotive qualification standards?
Yes, SZMMBZ5248ELT1G is AEC-Q101 qualified and PPAP capable. The "SZ" prefix explicitly denotes automotive-grade manufacturing site controls, enhanced process monitoring, and full qualification testing-including temperature cycling, highly accelerated stress testing (HAST), and mechanical shock-per JESD22 standards.
SZMMBZ5248ELT1G 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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 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)
SZMMBZ5248ELT1G FAQ
1.How can I place an order for SZMMBZ5248ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5248ELT1G 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 SZMMBZ5248ELT1G reliable?
The price and inventory of SZMMBZ5248ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5248ELT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5248ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5248ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5248ELT1G?
SZMMBZ5248ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5248ELT1G 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 SZMMBZ5248ELT1G?
For technical support, including SZMMBZ5248ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5248ELT1G requirements.
6.How does Aetrix verify that SZMMBZ5248ELT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5248ELT1G 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 SZMMBZ5248ELT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5248ELT1G?
All SZMMBZ5248ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5248ELT1G, 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 SZMMBZ5248ELT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5248ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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