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onsemi SZMMBZ5249BLT1G
- Part No.:
- SZMMBZ5249BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5249BLT1G.pdf
- Description:
- DIODE ZENER 19V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,915
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Product details
Overview
SZMMBZ5249BLT1G from onsemi is a 19 V, 225 mW Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers 6.6 mA test current at 19 V nominal Zener voltage, exhibits 23 Ω dynamic impedance at IZT, and supports ≤0.1 μA leakage at 14 V reverse bias - ideal for low-power portable power rails and reference stabilization.
For engineers reviewing the SZMMBZ5249BLT1G 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, and SOT-23 pin-compatible replacement options for automotive and high-reliability embedded systems.
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity, requiring reverse-bias operation to achieve stable Zener breakdown. Its 19 V nominal Zener voltage falls within the positive temperature coefficient range (>5 V), minimizing drift under thermal variation across −65 °C to +150 °C junction temperature.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), enabling unidirectional clamping with minimal parasitic capacitance (typ. <2 pF at 0 V bias). It meets Class 3 ESD rating (>16 kV HBM) and is Pb-free, halogen-free, and RoHS compliant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18.05–19.95 V @ 6.6 mA - tight ±5% tolerance enables accurate 19 V rail clamping without external trimming. |
| Power Dissipation | 225 mW on FR-5 board - defines maximum continuous dissipation before thermal derating (1.8 mW/°C above 25 °C). |
| Zener Impedance (ZZT) | 23 Ω @ IZT - low dynamic impedance ensures stable output voltage under varying load current conditions. |
| Leakage Current (IR) | ≤0.1 μA @ 14 V - ultra-low reverse leakage preserves battery life in always-on sensor nodes and standby circuits. |
| Thermal Resistance (RJA) | 556 °C/W - quantifies junction-to-ambient heat transfer efficiency on standard PCBs, critical for thermal margin analysis. |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling during automated assembly and field-level electrostatic discharge events. |
| Junction Temp Range | −65 °C to +150 °C - supports operation in automotive under-hood and industrial control environments. |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm body size, void-free thermosetting plastic case with corrosion-resistant finish. Cathode identified by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be held at voltage ≤ VZ − 0.95 V to avoid forward conduction. |
| 2 | No Connection | Internally isolated; no electrical function - must remain unconnected on PCB layout. |
| 3 | Cathode | Connected to regulated or clamped node; carries full Zener current during breakdown; polarity band aligns with this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and ADAS power domains with zero defects in stress testing. |
| Low Capacitance | Typ. <2 pF at 0 V bias - minimizes signal distortion in high-frequency analog sensing and RF front-end protection. |
| Pb-Free & RoHS Compliant | Fully compliant with EU RoHS Directive 2011/65/EU and J-STD-609 Category 3 moisture sensitivity level (MSL 1). |
| High ESD Robustness | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in handheld and wearable designs. |
| Stable Temperature Coefficient | +5.5 mV/°C typical for 19 V devices - predictable drift behavior simplifies compensation in precision references. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 19 V supply for LIN transceiver ICs and door module microcontrollers. IC Role / Device Role / Timing Role: Voltage clamp and reference stabilizer protecting downstream logic from load-dump transients. Use Value: Maintains stable 19 V rail during ISO 7637-2 Pulse 5a (120 V/100 ms) events without derating or thermal shutdown. |
Use Scenario: Providing precise 19 V reference for 24-bit delta-sigma ADCs measuring strain gauge outputs. IC Role / Device Role / Timing Role: Low-drift Zener reference source replacing higher-cost shunt regulators in 4–20 mA loop-powered sensors. Use Value: Enables <±0.1% full-scale accuracy over −40 °C to +85 °C due to matched TC and low ZZT. |
| Portable Medical Pulse Oximeter | 5G Small Cell Power Management |
Use Scenario: Overvoltage protection for photodiode amplifier stages powered from coin-cell batteries. IC Role / Device Role / Timing Role: Reverse-biased clamping element limiting input voltage to op-amp rails during ESD events. Use Value: Prevents latch-up in rail-to-rail amplifiers with <0.1 μA leakage preserving 10-year battery life. |
Use Scenario: Biasing GaN FET gate drivers requiring stable 19 V auxiliary supply in outdoor base stations. IC Role / Device Role / Timing Role: Primary Zener regulator feeding LDO input stage in multi-rail PMIC subsystems. Use Value: Delivers 6.6 mA continuous current with <23 Ω impedance, reducing LDO dropout and improving PSRR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | 18 V nominal, ±5% tolerance, 350 mW rating, same SOT-23 package but non-AEC-Q101 qualified. | Lacks automotive qualification and has higher ZZT (40 Ω), limiting use in safety-critical modules. | Select when cost-sensitive industrial designs require higher power headroom and AEC-Q101 is not mandated. |
| SZBZX84C19LT3G | 19 V nominal, ±5%, AEC-Q101 qualified, 350 mW, SOT-23 - differs only in power rating and tape/reel quantity (10k vs 3k). | Higher PD allows greater transient energy absorption but requires identical layout and thermal design. | Choose for volume production where 350 mW margin improves reliability in high-temperature enclosures. |
Compared with BZX84-C18LT1G, SZMMBZ5249BLT1G offers tighter thermal stability and automotive qualification; compared with SZBZX84C19LT3G, it trades 125 mW lower power for optimized 3k-reel logistics and identical electrical performance in constrained layouts.
Availability
SZMMBZ5249BLT1G is available at Aetrix Electronics and suitable for automotive electronics, portable medical instrumentation, and 5G infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMMBZ5249BLT1G 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, intelligent power and sensing solutions for automotive, industrial, cloud, and IoT applications.
The MMBZ52xxBLT1G/SZMMBZ52xxBLT1G series was developed specifically for high-density, low-power voltage regulation in automotive and portable electronics - emphasizing AEC-Q101 compliance, miniature packaging, and robust ESD immunity.
FAQ
What is the Zener voltage tolerance of SZMMBZ5249BLT1G?
The SZMMBZ5249BLT1G has a Zener voltage range of 18.05 V to 19.95 V at 6.6 mA test current, corresponding to a ±5% tolerance around the nominal 19 V value. This tolerance is guaranteed across the full operating temperature range and is verified per onsemi's production test flow - ensuring consistent performance in SZMMBZ5249BLT1G-based voltage reference designs.
Is SZMMBZ5249BLT1G suitable for automotive applications?
Yes, SZMMBZ5249BLT1G is AEC-Q101 qualified and PPAP capable, with manufacturing site and process controls meeting automotive requirements. Its −65 °C to +150 °C junction temperature range, Class 3 ESD rating, and Pb-free/RoHS compliance make it appropriate for under-hood and cabin modules - confirmed in onsemi's official qualification report for the SZMMBZ52xxBLT1G series.
What is the meaning of "SZ" prefix in SZMMBZ5249BLT1G?
The "SZ" prefix denotes onsemi's automotive-grade variant of the MMBZ52xxBLT1G series, indicating unique site and process control changes required for automotive qualification. It reflects stricter lot traceability, enhanced reliability testing, and dedicated production lines - distinguishing SZMMBZ5249BLT1G from commercial-grade MMBZ5249BLT1G while maintaining identical electrical specifications and pinout.
Can SZMMBZ5249BLT1G replace MMBZ5249BLT1G in existing designs?
Yes, SZMMBZ5249BLT1G is a direct functional and pin-compatible replacement for MMBBZ5249BLT1G, sharing identical electrical characteristics, SOT-23 package dimensions, and pin configuration (Pin 1: Anode, Pin 2: NC, Pin 3: Cathode). The only differences are automotive qualification and traceability - no PCB or schematic changes are needed when upgrading to SZMMBZ5249BLT1G.
What is the maximum reverse leakage current for SZMMBZ5249BLT1G?
The maximum reverse leakage current for SZMMBZ5249BLT1G is 0.1 μA at 14 V reverse voltage and 25 °C ambient temperature, as specified in the Electrical Characteristics table. This ultra-low leakage supports battery-powered applications where standby current must remain below 100 nA - a value confirmed in onsemi's characterization data for the SZMMBZ5249BLT1G device.
SZMMBZ5249BLT1G 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):
- 19 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 23 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)
SZMMBZ5249BLT1G FAQ
1.How can I place an order for SZMMBZ5249BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5249BLT1G 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 SZMMBZ5249BLT1G reliable?
The price and inventory of SZMMBZ5249BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5249BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5249BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5249BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5249BLT1G?
SZMMBZ5249BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5249BLT1G 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 SZMMBZ5249BLT1G?
For technical support, including SZMMBZ5249BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5249BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5249BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5249BLT1G 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 SZMMBZ5249BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5249BLT1G?
All SZMMBZ5249BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5249BLT1G, 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 SZMMBZ5249BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5249BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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