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onsemi SZMMBZ5239BLT1G
- Part No.:
- SZMMBZ5239BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5239BLT1G.pdf
- Description:
- DIODE ZENER 9.1V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:19,751
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Product details
Overview
SZMMBZ5239BLT1G from onsemi is a 9.1 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 10 Ω dynamic impedance at 20 mA test current and 3 μA leakage current at 7 V reverse bias. It provides precision voltage regulation in space-constrained portable electronics such as smartphone power rails and USB interface protection circuits.
For engineers reviewing the SZMMBZ5239BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), AEC-Q101 qualification, and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its nominal 9.1 V Zener voltage is specified at 20 mA test current (IZT) with ±5% tolerance, and exhibits a temperature coefficient near zero in the 8–10 V range per typical characteristics (Figure 1).
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with cathode polarity indicated by a band. It supports automated assembly and delivers 225 mW power handling on FR-5 board, derating linearly at 1.8 mW/°C above 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal, 8.64–9.56 V min/max at IZT = 20 mA - defines stable regulation point under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board at TA = 25°C - sets maximum continuous power before thermal derating applies |
| Zener Impedance (ZZT) | 10 Ω max at IZT = 20 mA - determines output voltage stability under load transients |
| Leakage Current (IR) | 3 μA max at VR = 7 V - ensures minimal standby current in undervoltage clamp configurations |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust handling in consumer electronics assembly |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - quantifies junction-to-ambient thermal path for reliability modeling |
| AEC-Q101 Qualified | Yes - confirms suitability for automotive electronic control units requiring stress-tested components |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, dimensions 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish. Cathode identified by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of regulated node; reverse-biased during Zener operation |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential side (e.g., supply rail); polarity band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified and PPAP capable - meets automotive electronics reliability and traceability requirements |
| Pb-free, Halogen-free | RoHS compliant with BFR-free construction - satisfies environmental compliance for global OEMs |
| High-density packaging | SOT-23 footprint (2.9 × 1.3 mm) - enables placement in tight spaces on mobile PCBs and wearables |
| ESD-hardened design | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in low-voltage I/O clamping |
| Stable low-voltage regulation | 9.1 V nominal with ±5% tolerance and near-zero TC in 8–10 V range - reduces drift over temperature in reference circuits |
Applications
| USB Power Rail Clamp | Smartphone Battery Monitor Reference |
|---|---|
Use Scenario: Clamps 5 V USB supply against transient overvoltage events during hot-plug or ESD discharge. IC Role / Device Role / Timing Role: Two-terminal shunt regulator placed between VBUS and GND to clamp excess voltage. Use Value: Limits voltage excursion to ≤9.56 V with <3 μA leakage at 7 V, preserving downstream USB PHY integrity. |
Use Scenario: Provides stable reference for ADC measurement of lithium-ion battery cell voltage in handheld devices. IC Role / Device Role / Timing Role: Precision Zener reference sourcing <10 μA into ADC input buffer. Use Value: Delivers 9.1 V ±5% with <10 Ω dynamic impedance, enabling <0.5% full-scale measurement accuracy. |
| Automotive CAN Transceiver Bias | IoT Sensor Node Voltage Supervisor |
Use Scenario: Supplies regulated bias voltage to isolated CAN transceiver VIO pin in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Zener-based local regulator for logic-level translation circuitry. Use Value: AEC-Q101 qualification ensures operation across −40°C to +125°C ambient, supporting engine bay deployment. |
Use Scenario: Monitors main supply rail in battery-powered environmental sensors to trigger brown-out reset. IC Role / Device Role / Timing Role: Undervoltage detection element feeding comparator input. Use Value: Low 3 μA leakage at 7 V enables multi-year operation on coin-cell batteries without significant drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C9V1LT1G | Same 9.1 V nominal, but 350 mW rating and 15 Ω ZZT - higher power, higher impedance | Preferred for higher-current regulation (up to 40 mA), less suitable for ultra-low-leakage designs | Select when board layout allows larger SOT-23 thermal mass and leakage >5 μA is acceptable |
| SZMMBZ5239BTS-7-F | Identical electrical specs, but in SOT-323 (SC-70) package - 2.2 × 1.35 × 1.1 mm vs. 2.9 × 1.3 × 1.0 mm | Used where smaller footprint is critical, but thermal performance reduced (RJA ≈ 625 °C/W) | Choose only if PCB area savings outweigh 22% higher thermal resistance and tighter assembly tolerances |
Compared with BZX84-C9V1LT1G and SZMMBZ5239BTS-7-F, the SZMMBZ5239BLT1G offers optimal balance of AEC-Q101 compliance, 225 mW FR-5 power handling, and 10 Ω low-impedance regulation - making it preferred for automotive and portable electronics where reliability, size, and precision are jointly constrained.
Availability
SZMMBZ5239BLT1G is available at Aetrix Electronics and suitable for automotive ECUs, smartphone power management, and IoT sensor nodes requiring stable component supply with guaranteed long-term continuity.
Supply support for SZMMBZ5239BLT1G 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT markets.
The MMBZ52xxBLT1G/SZMMBZ52xxBLT1G series was designed specifically for compact, high-reliability voltage regulation in portable and automotive electronics - emphasizing low-profile packaging, AEC-Q101 compliance, and robust ESD immunity.
FAQ
What is the Zener voltage tolerance of SZMMBZ5239BLT1G?
The SZMMBZ5239BLT1G has a Zener voltage tolerance of ±5% around its nominal 9.1 V rating, meaning the actual measured VZ at IZT = 20 mA falls between 8.64 V and 9.56 V. This tolerance is guaranteed across the full operating temperature range and is verified per onsemi's production test flow. The SZMMBZ5239BLT1G maintains this specification while meeting AEC-Q101 stress requirements.
Is SZMMBZ5239BLT1G suitable for automotive applications?
Yes, SZMMBZ5239BLT1G is explicitly qualified to AEC-Q101 standards and is PPAP capable, confirming its suitability for automotive applications including body control modules, infotainment power supplies, and sensor interfaces. The "SZ" prefix denotes automotive-grade screening, including extended temperature operation (−65°C to +150°C) and enhanced process controls. SZMMBZ5239BLT1G also carries RoHS, Pb-free, and halogen-free certifications required by Tier 1 suppliers.
What is the thermal resistance of SZMMBZ5239BLT1G on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of SZMMBZ5239BLT1G is 556 °C/W when mounted on an FR-5 board at 25°C ambient. This value assumes standard JEDEC test conditions and directly determines allowable power dissipation: PD = (TJmax − TA) / RJA. With TJmax = +150°C, maximum continuous power drops to ~225 mW at 25°C and derates by 1.8 mW/°C above that temperature. This RJA value is confirmed in the "Maximum Ratings" table of the official onsemi datasheet.
Does SZMMBZ5239BLT1G have a no-connect pin, and how should it be handled on PCB?
Yes, SZMMBZ5239BLT1G has Pin 2 designated as "No Connection" per the mechanical outline (Style 8). This terminal is internally unconnected and must remain electrically floating - no PCB trace, pad, or solder connection should be made to it. The device functions correctly with only Pins 1 (Anode) and 3 (Cathode) routed. Leaving Pin 2 unconnected avoids unintended parasitic coupling or thermal paths that could affect regulation stability or ESD performance.
What is the leakage current specification for SZMMBZ5239BLT1G at 7 V reverse bias?
The maximum reverse leakage current (IR) for SZMMBZ5239BLT1G is 3 μA when biased at VR = 7 V, as specified in the Electrical Characteristics table. This low leakage enables efficient use in battery-powered systems where standby current must be minimized. The value is measured at TA = 25°C and remains below 10 μA across the full −65°C to +150°C storage temperature range. This IR spec directly supports its use in voltage supervisor and reference circuits where quiescent current impacts system battery life.
SZMMBZ5239BLT1G 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):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 7 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)
SZMMBZ5239BLT1G FAQ
1.How can I place an order for SZMMBZ5239BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5239BLT1G 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 SZMMBZ5239BLT1G reliable?
The price and inventory of SZMMBZ5239BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5239BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5239BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5239BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5239BLT1G?
SZMMBZ5239BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5239BLT1G 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 SZMMBZ5239BLT1G?
For technical support, including SZMMBZ5239BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5239BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5239BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5239BLT1G 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 SZMMBZ5239BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5239BLT1G?
All SZMMBZ5239BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5239BLT1G, 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 SZMMBZ5239BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5239BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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