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onsemi SZMMBZ5246ELT1G
- Part No.:
- SZMMBZ5246ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5246ELT1G.pdf
- Description:
- DIODE ZENER 16V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,566
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Product details
Overview
SZMMBZ5246ELT1G 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 ±5% nominal Zener voltage tolerance at 7.8 mA test current, exhibits 600 Ω maximum dynamic impedance at IZT, and supports ≤0.1 µA reverse leakage at 12 V, making it suitable for low-power biasing and reference applications in portable electronics.
For engineers reviewing the SZMMBZ5246ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q101 qualification, 16 V nominal Zener voltage with tight 15.2–16.8 V range, 225 mW power rating on FR-5 board, Class 3 ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity and no internal connection on pin 2. Its Zener breakdown mechanism provides stable reverse-biased regulation under DC or pulsed conditions, with thermal resistance of 556 °C/W (FR-5) enabling operation across −65 °C to +150 °C junction temperature range.
The SZ prefix denotes automotive-grade qualification per AEC-Q101, including PPAP capability and site-specific process controls. Electrical behavior is defined at 25 °C ambient with pulse-tested Zener voltage, and forward voltage remains ≤0.95 V at 10 mA - critical for bidirectional clamping or dual-purpose bias/reference use cases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 16 V - precise regulation point for 15 V rail stabilization or 3.3 V LDO feedback networks |
| Zener Voltage Range | 15.2 V to 16.8 V - ensures design margin compliance without external trimming |
| Power Dissipation | 225 mW on FR-5 board - supports continuous operation in handheld PCBs with minimal thermal derating |
| Zener Impedance | 600 Ω max at 7.8 mA - maintains voltage stability under varying load currents in reference circuits |
| Reverse Leakage | ≤0.1 µA at 12 V - minimizes quiescent current in battery-powered sensor nodes |
| ESD Rating | Class 3 (>16 kV HBM) - eliminates need for external ESD protection in front-end interfaces |
| Junction Temp Range | −65 °C to +150 °C - enables deployment in under-hood automotive modules and industrial controllers |
Pinout & Package
Package: SOT-23 (TO-236), 2.90 × 1.30 × 1.00 mm, Pb-free, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by band; pin 2 is unconnected (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation |
| 2 | No Connection | Internally isolated; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Connected to regulated voltage node; carries full Zener current during conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including infotainment power rails and body control modules |
| 225 mW Power Rating | Enables direct replacement of larger-package Zeners without thermal redesign |
| Class 3 ESD Robustness | Eliminates need for discrete TVS in ESD-prone USB or button interface lines |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for consumer and medical devices |
| Optimized for Automated Assembly | SOT-23 footprint aligns with standard pick-and-place nozzle tooling and reflow profiles |
Applications
| Portable Power Management | Automotive Sensor Biasing |
|---|---|
|
Use Scenario: Regulating reference voltage for ADCs and comparators in Bluetooth earbuds and smartwatches. IC Role / Device Role / Timing Role: Zener diode providing stable 16 V reference for high-side current sense amplifier biasing. Use Value: Tight 15.2–16.8 V tolerance ensures consistent gain calibration across production units without trimming. |
Use Scenario: Supplying bias current to NTC thermistors and Hall-effect sensors in engine control units. IC Role / Device Role / Timing Role: Precision voltage clamp protecting sensor IC inputs from transients on 12 V vehicle bus. Use Value: 225 mW rating sustains repeated load-dump pulses while maintaining <0.1 µA leakage at cold start. |
| Industrial IoT Node Protection | USB-C Port Clamping |
|
Use Scenario: Overvoltage protection for RS-485 transceivers in factory automation gateways. IC Role / Device Role / Timing Role: Bidirectional clamping element shunting surge energy to ground during EFT events. Use Value: >16 kV HBM ESD rating prevents latch-up in unshielded field wiring environments. |
Use Scenario: VBUS line protection in compact USB-C chargers and PD adapters. IC Role / Device Role / Timing Role: Low-capacitance Zener (typ. 2 pF at 0 V) limiting voltage spikes without signal distortion. Use Value: SOT-23 size allows placement directly at connector footprint, minimizing trace inductance. |
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, but 300 mW rating and higher ZZT (1000 Ω max); not AEC-Q101 qualified | Lacks automotive qualification; suited for commercial-grade consumer power supplies | Select when higher power headroom is needed and automotive compliance is unnecessary |
| SZBZX84C16LT1G | 16 V nominal, AEC-Q101 qualified, but 300 mW rating and 1000 Ω max ZZT; different thermal resistance (RJA = 450 °C/W) | Higher power handling but looser impedance spec affects reference accuracy in precision analog stages | Prefer for automotive systems needing >225 mW dissipation where ±5% VZ tolerance remains acceptable |
Compared with SZMMBZ5246ELT1G, BZX84-C16LT1G offers higher power but lacks automotive qualification and has poorer impedance control, while SZBZX84C16LT1G meets AEC-Q101 but trades tighter Zener impedance for greater power - making SZMMBZ5246ELT1G optimal for space-limited, precision-regulated automotive and portable designs.
Availability
SZMMBZ5246ELT1G is available at Aetrix Electronics and suitable for automotive ECUs, portable medical monitors, and industrial sensor nodes requiring stable component supply with guaranteed long-term sourcing and AEC-Q101 compliance.
Supply support for SZMMBZ5246ELT1G 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, and edge applications, with core expertise in power management, analog, and sensing technologies.
The MMBZ52xx/SZMMBZ52xx series targets miniaturized voltage regulation in high-density PCBs, emphasizing reliability, ESD resilience, and automotive-grade process control for mission-critical embedded systems.
FAQ
What is the Zener voltage tolerance of SZMMBZ5246ELT1G?
The SZMMBZ5246ELT1G has a nominal Zener voltage of 16 V with a guaranteed range of 15.2 V to 16.8 V at 7.8 mA test current - corresponding to ±5% tolerance. This specification is measured under pulse-test conditions at 25 °C ambient and applies across the full operating temperature range of −65 °C to +150 °C junction temperature. The SZMMBZ5246ELT1G datasheet confirms this range in the Electrical Characteristics table on page 2.
Is SZMMBZ5246ELT1G suitable for automotive applications?
Yes, SZMMBZ5246ELT1G is explicitly AEC-Q101 qualified and PPAP capable, with manufacturing controls meeting automotive site requirements. Its thermal performance (−65 °C to +150 °C junction range), ESD robustness (>16 kV HBM), and process traceability make it appropriate for engine control modules, ADAS power supplies, and body electronics. The "SZ" prefix in SZMMBZ5246ELT1G denotes this automotive-grade status per onsemi's ordering nomenclature.
What is the function of pin 2 on SZMMBZ5246ELT1G?
Pin 2 of the SZMMBZ5246ELT1G is a no-connect (NC) terminal - internally unconnected and electrically isolated. Per the mechanical outline (Style 8) and Electrical Characteristics table, only pins 1 (anode) and 3 (cathode) participate in circuit operation. PCB layout must leave pin 2 unconnected; routing traces or applying solder paste to this pad may cause assembly defects or unintended parasitic coupling.
How does the power dissipation rating of SZMMBZ5246ELT1G vary with temperature?
SZMMBZ5246ELT1G is rated for 225 mW total power dissipation on FR-5 board at 25 °C ambient, derating linearly at 1.8 mW/°C above that temperature. At 85 °C ambient, usable power drops to approximately 117 mW. This derating is defined in the Maximum Ratings table and reflects thermal resistance of 556 °C/W (junction-to-ambient). For alumina substrates, the rating increases to 300 mW at 25 °C with 2.4 mW/°C derating.
What is the forward voltage specification for SZMMBZ5246ELT1G?
The forward voltage of SZMMBZ5246ELT1G is specified as ≤0.95 V at 10 mA forward current (IF), per the Electrical Characteristics table. This parameter is relevant when the device is used in forward-biased configurations - such as bidirectional transient suppression or dual-purpose bias/reference circuits. The value is tested at 25 °C and remains consistent across the MMBZ52xxELT1G/SZMMBZ52xxELT1G family.
SZMMBZ5246ELT1G 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:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5246ELT1G FAQ
1.How can I place an order for SZMMBZ5246ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5246ELT1G 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 SZMMBZ5246ELT1G reliable?
The price and inventory of SZMMBZ5246ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5246ELT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5246ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5246ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5246ELT1G?
SZMMBZ5246ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5246ELT1G 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 SZMMBZ5246ELT1G?
For technical support, including SZMMBZ5246ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5246ELT1G requirements.
6.How does Aetrix verify that SZMMBZ5246ELT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5246ELT1G 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 SZMMBZ5246ELT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5246ELT1G?
All SZMMBZ5246ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5246ELT1G, 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 SZMMBZ5246ELT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5246ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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