My Inquiry
My Account
onsemi SZMMBZ5246BLT1
- Part No.:
- SZMMBZ5246BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5246BLT1.pdf
- Description:
- DIODE ZENER 16V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMBZ5246BLT1 from onsemi is a 16 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and transient suppression in space-constrained circuits. It delivers 7.8 mA test current (IZT), 17 Ω dynamic impedance (ZZT), and 0.1 µA leakage at 12 V reverse bias - enabling stable reference generation in portable power rails and I/O protection networks.
For engineers reviewing the SZMMBZ5246BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5% at 16 V nominal), thermal resistance (556 °C/W on FR-5 board), ESD robustness (>16 kV HBM), AEC-Q101 qualification, and Pb-free SOT-23 packaging compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown at precisely controlled Zener voltage (15.2–16.8 V) when biased above its knee current (IZK = 0.25 mA). Its low dynamic impedance ensures minimal output variation under load changes, while its −65 °C to +150 °C junction temperature range supports automotive and industrial environments.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and UL 94 V-0 flammability rating. Thermal derating is linear at 1.8 mW/°C above 25 °C on FR-5 board, with maximum soldering temperature of 260 °C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.2 V min / 16.0 V nom / 16.8 V max @ IZT = 7.8 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 225 mW @ TA = 25 °C on FR-5 board - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance (ZZT) | 17 Ω max @ IZT = 7.8 mA - determines output voltage stability against current fluctuations in regulation mode |
| Leakage Current (IR) | 0.1 µA max @ VR = 12 V - ensures minimal standby current draw in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - guarantees survivability during manual handling and board-level ESD events |
| Junction Temp Range | −65 °C to +150 °C - enables operation in under-hood automotive, industrial control, and outdoor electronics |
| AEC-Q101 Qualified | Yes - confirms reliability validation for automotive electronic systems per stress-test requirements |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount plastic package with void-free thermosetting mold compound, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode indicated by polarity band. Maximum soldering temperature: 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables compact voltage clamping in battery-powered devices without heatsinking on standard FR-5 PCBs |
| Pb-Free Packaging | Complies with RoHS Directive 2011/65/EU and supports lead-free reflow soldering profiles |
| AEC-Q101 Qualification | Validates long-term reliability for automotive infotainment, body control, and ADAS subsystems |
| ESD Robustness >16 kV HBM | Eliminates need for external ESD protection in I/O line conditioning and sensor interface circuits |
| Small SOT-23 Footprint | Reduces board area by >50% vs. DO-35, supporting high-density layouts in smartphones and wearables |
Applications
| Portable Power Rail Clamping | I/O Line Transient Suppression |
|---|---|
|
Use Scenario: Protecting 15 V logic supply rail in handheld medical monitors from load-dump spikes and hot-swap surges. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp overvoltage transients to ≤16.8 V. Use Value: Prevents damage to downstream LDOs and microcontrollers by limiting peak rail voltage within safe operating margin. |
Use Scenario: Shielding UART and I²C lines in automotive telematics modules from ISO 7637-2 pulse 1/2a-induced transients. IC Role / Device Role / Timing Role: Bidirectional clamping element (with series resistor) limiting line voltage to ±16.8 V relative to ground. Use Value: Maintains signal integrity during EMC testing while adding <0.5 mm² footprint and zero active components. |
| Reference Voltage Source | Overvoltage Detection Threshold |
|
Use Scenario: Generating stable 16 V reference for comparator-based battery charge termination in 4S Li-ion packs. IC Role / Device Role / Timing Role: Precision Zener providing temperature-stable threshold voltage to op-amp input. Use Value: Achieves ±5% voltage accuracy across −40 °C to +125 °C without trimming or calibration. |
Use Scenario: Triggering fault shutdown in industrial PLC analog input modules when field wiring exceeds 16 V. IC Role / Device Role / Timing Role: Zener acting as voltage-sensing element in discrete overvoltage latch circuit. Use Value: Delivers deterministic trip point with <1 µs response time and immunity to EFT bursts up to 4 kV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C16LT1G | Same 16 V nominal Zener voltage, but 300 mW rating and 40 Ω ZZT; not AEC-Q101 qualified | Lacks automotive qualification and has higher dynamic impedance - suitable for consumer-grade power rails only | Select when higher power headroom is needed and automotive compliance is not required |
| MMSZ5246ET1G | Identical 16 V Zener spec and SOT-23 package, but rated at 350 mW and 20 Ω ZZT; AEC-Q101 qualified | Higher power rating allows use in 24 V system clamping with reduced thermal stress | Prefer for new designs requiring extended power margin and same automotive qualification level |
Compared with BZX84-C16LT1G, SZMMBZ5246BLT1 offers tighter impedance and automotive qualification; compared with MMSZ5246ET1G, it trades 125 mW power headroom for identical footprint and lower cost in volume production.
Availability
SZMMBZ5246BLT1 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor interfaces, and portable medical devices requiring stable component supply, AEC-Q101 compliance, and high-volume tape-and-reel logistics.
Supply support for SZMMBZ5246BLT1 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.
SZMMBZ5246BLT1 belongs to the MMBZ52xxBLT1/SZMMBZ52xxBLT1G Zener regulator family, engineered for high-density voltage reference and transient suppression in automotive and portable electronics where space, reliability, and regulatory compliance are critical.
FAQ
What is the Zener voltage tolerance of SZMMBZ5246BLT1?
The SZMMBZ5246BLT1 has a Zener voltage range of 15.2 V (min) to 16.8 V (max) at IZT = 7.8 mA, corresponding to ±5% tolerance around the nominal 16.0 V rating. This tolerance is guaranteed across the full operating temperature range and is verified per AEC-Q101 stress testing protocols.
Is SZMMBZ5246BLT1 compatible with lead-free reflow soldering?
Yes, SZMMBZ5246BLT1 is Pb-free and qualified for lead-free reflow soldering. Its SOT-23 package withstands peak temperatures up to 260 °C for 10 seconds, meeting JEDEC J-STD-020 moisture sensitivity and IPC/JEDEC J-STD-006 solderability standards.
Does SZMMBZ5246BLT1 have a functional connection on Pin 2?
No, Pin 2 of SZMMBZ5246BLT1 is internally not connected (NC). It must remain unconnected on the PCB - no trace, pad, or via should be routed to this terminal. Only Pins 1 (Anode) and 3 (Cathode) participate in circuit operation.
How does the thermal derating of SZMMBZ5246BLT1 work above 25°C?
SZMMBZ5246BLT1 derates linearly at 1.8 mW/°C above 25 °C ambient when mounted on FR-5 board. At 85 °C ambient, its usable power drops to 117 mW (225 mW − (85 − 25) × 1.8 mW). Derating assumes no forced airflow and standard 1-inch² copper pour.
Can SZMMBZ5246BLT1 replace older MMBZ5246BLT1 variants?
Yes, SZMMBZ5246BLT1 is a direct replacement for MMBZ5246BLT1 with identical electrical specs, pinout, and package. The "SZ" prefix denotes enhanced automotive traceability and control, while maintaining full form-fit-function compatibility in existing designs.
SZMMBZ5246BLT1 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):
- 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)
SZMMBZ5246BLT1 FAQ
1.How can I place an order for SZMMBZ5246BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5246BLT1 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 SZMMBZ5246BLT1 reliable?
The price and inventory of SZMMBZ5246BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5246BLT1 is usually 5 days.
3.What payment methods are accepted for SZMMBZ5246BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5246BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5246BLT1?
SZMMBZ5246BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5246BLT1 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 SZMMBZ5246BLT1?
For technical support, including SZMMBZ5246BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5246BLT1 requirements.
6.How does Aetrix verify that SZMMBZ5246BLT1 is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5246BLT1 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 SZMMBZ5246BLT1 meets industry standards.
7.What is the process for return or replacement of SZMMBZ5246BLT1?
All SZMMBZ5246BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5246BLT1, 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 SZMMBZ5246BLT1 part is unused and in its original packaging.
Return procedure for SZMMBZ5246BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ5246BLT1 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
