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onsemi SZMMBZ5246BLT1G
- Part No.:
- SZMMBZ5246BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5246BLT1G.pdf
- Description:
- DIODE ZENER 16V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,513
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Product details
Overview
SZMMBZ5246BLT1G from onsemi is a 16 V, 225 mW Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers nominal Zener voltage of 16.0 V at 7.8 mA test current, with dynamic impedance of 17 Ω and leakage current ≤0.1 μA at 12 V reverse bias - used in power rail clamping for portable battery-powered systems.
For engineers reviewing the SZMMBZ5246BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), AEC-Q101 qualification, ESD robustness (>16 kV HBM), and Pb-free RoHS compliance.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, optimized for low-power shunt regulation. Its 16.0 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing, enabling stable reference behavior across −65°C to +150°C junction temperature range.
The SOT-23 package supports automated placement and reflow soldering at 260°C for 10 seconds. With no internal connection on pin 2, it functions strictly as a dual-terminal device - eliminating parasitic coupling paths common in multi-pin regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.2 V to 16.8 V at IZT = 7.8 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZT) | 17 Ω at IZT = 7.8 mA - determines output voltage stability under load transients |
| Leakage Current (IR) | ≤0.1 μA at VR = 12 V - ensures minimal standby current in undervoltage detection circuits |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld electronics without external ESD protection |
| Operating Temperature | −65°C to +150°C - supports automotive under-hood and industrial control environments |
| AEC-Q101 Qualified | Yes - validated for automotive electronic modules requiring stress-tested reliability |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during fault conditions |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Connected to regulated voltage node; serves as reference output terminal in shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified and PPAP capable - meets automotive OEM supply chain requirements |
| High ESD immunity | Class 3 (>16 kV HBM) - eliminates need for discrete TVS in many consumer interface circuits |
| Pb-free and RoHS compliant | Fully halogen-free/BFR-free construction - satisfies global environmental compliance mandates |
| Thermal performance | 556 °C/W junction-to-ambient on FR-5 - enables reliable operation without heatsinking in low-power designs |
| Small footprint | SOT-23 package - saves >60% board area vs. DO-35 through-hole Zeners in high-density layouts |
Applications
| USB Power Rail Clamping | Automotive Sensor Reference |
|---|---|
Use Scenario: Protects 5 V USB data lines from transient overvoltage during hot-plug events in portable accessories. IC Role / Device Role / Timing Role: Shunt clamping diode placed between VBUS and GND to clamp spikes above 5.5 V. Use Value: Leverages 17 Ω Zener impedance and <0.1 μA leakage to avoid loading valid 5 V signals while responding within nanoseconds to ESD events. |
Use Scenario: Provides stable 16 V reference for analog front-end circuitry in engine control unit (ECU) pressure sensors. IC Role / Device Role / Timing Role: Precision voltage reference source for ADC biasing and sensor excitation. Use Value: Maintains ±5% regulation over −40°C to +125°C ambient with AEC-Q101 validation - critical for emission-critical sensor accuracy. |
| Portable Device Battery Monitoring | Industrial PLC Input Protection |
Use Scenario: Monitors lithium-ion battery pack voltage in smart wearables using resistive divider + Zener clamp. IC Role / Device Role / Timing Role: Overvoltage limiter on divider output to protect microcontroller ADC input. Use Value: 225 mW rating allows sustained clamping during charger fault conditions; 16 V threshold aligns with 4S Li-ion max voltage (16.8 V). |
Use Scenario: Shields 24 V digital input channels in programmable logic controllers from field-wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage suppression element at signal entry point. Use Value: 16 V Zener voltage provides 8 V margin above nominal 24 V supply, while 556 °C/W RJA ensures thermal survival during repeated 100 V/1 s transients. |
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-C16LT1G | Same 16 V nominal Zener voltage but rated at 300 mW on FR-5; higher ZZT (40 Ω) and wider VZ tolerance (±6%) | Preferred where higher power margin is needed but tighter voltage stability is not required | Select BZX84-C16LT1G when operating near thermal limits or when cost sensitivity outweighs regulation precision |
| SZMMBZ5246BT1G | Identical electrical specs but in legacy tape-and-reel packaging (no "L" suffix); same AEC-Q101 qualification and SOT-23 footprint | Used in legacy production lines requiring backward-compatible reel format | Choose SZMMBZ5246BT1G only if existing pick-and-place equipment requires non-"L" tape configuration |
Compared with BZX84-C16LT1G and SZMMBZ5246BT1G, SZMMBZ5246BLT1G offers superior voltage regulation (±5% vs ±6%), lower dynamic impedance (17 Ω vs 40 Ω), and modern tape-and-reel logistics - making it optimal for new automotive and high-reliability portable designs.
Availability
SZMMBZ5246BLT1G is available at Aetrix Electronics and suitable for automotive ECUs, portable battery management systems, and industrial PLC input protection requiring stable component supply with full AEC-Q101 traceability.
Supply support for SZMMBZ5246BLT1G 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 - focused on enabling sustainable technology.
SZMMBZ5246BLT1G belongs to the MMBZ52xxBLT1G/SZMMBZ52xxBLT1G family of Zener regulators engineered for high-density, low-power voltage reference and protection in automotive and portable electronics.
FAQ
What is the Zener voltage tolerance of SZMMBZ5246BLT1G?
The SZMMBZ5246BLT1G has a Zener voltage range of 15.2 V to 16.8 V at IZT = 7.8 mA, corresponding to ±5% tolerance around the nominal 16.0 V value. This tight tolerance ensures predictable clamping behavior in precision reference and protection circuits - critical for meeting automotive functional safety thresholds where voltage drift must stay within defined guardbands. The SZMMBZ5246BLT1G maintains this specification across its full operating temperature range.
Is SZMMBZ5246BLT1G suitable for automotive applications?
Yes, SZMMBZ5246BLT1G is AEC-Q101 qualified and PPAP capable - explicitly designed for automotive use cases including engine control units, ADAS sensor interfaces, and infotainment power rails. Its −65°C to +150°C junction temperature range, 16 kV HBM ESD rating, and Pb-free RoHS compliance meet Tier 1 OEM requirements. The "SZ" prefix denotes automotive-specific process controls and change management - making SZMMBZ5246BLT1G distinct from commercial-grade MMBZ5246BLT1G variants.
What is the thermal resistance of SZMMBZ5246BLT1G on standard PCB material?
SZMMBZ5246BLT1G has a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on FR-5 board per datasheet Note 1. This value assumes standard 1.0 × 0.75 × 0.62 inch test board layout. Engineers must apply thermal derating above 25°C ambient at 1.8 mW/°C - meaning maximum usable power drops to 189 mW at 85°C ambient. For higher thermal loads, alumina substrate mounting reduces RJA to 417 °C/W.
Does SZMMBZ5246BLT1G have a connected pin 2?
No, pin 2 of SZMMBZ5246BLT1G is internally not connected (NC), as confirmed in the datasheet's marking diagram and mechanical outline (Style 8). It must remain unconnected on the PCB - no trace, pad, or via should be routed to this terminal. This NC configuration eliminates parasitic capacitance and simplifies layout compared to three-terminal regulators, preserving high-frequency response in ESD protection applications.
How does the leakage current of SZMMBZ5246BLT1G compare at 12 V reverse bias?
At 12 V reverse bias (VR), SZMMBZ5246BLT1G exhibits leakage current ≤0.1 μA - verified per Electrical Characteristics table on page 3 of the datasheet. This ultra-low leakage enables use in battery-backed monitoring circuits where standby current must remain below 1 μA. Compared to older Zener families, this spec reflects improved process control and die passivation - directly supporting multi-year operation in energy-harvesting and wearable devices powered by SZMMBZ5246BLT1G-regulated rails.
SZMMBZ5246BLT1G 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):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12 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)
SZMMBZ5246BLT1G FAQ
1.How can I place an order for SZMMBZ5246BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5246BLT1G 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 SZMMBZ5246BLT1G reliable?
The price and inventory of SZMMBZ5246BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5246BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5246BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5246BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5246BLT1G?
SZMMBZ5246BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5246BLT1G 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 SZMMBZ5246BLT1G?
For technical support, including SZMMBZ5246BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5246BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5246BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5246BLT1G 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 SZMMBZ5246BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5246BLT1G?
All SZMMBZ5246BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5246BLT1G, 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 SZMMBZ5246BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5246BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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