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onsemi SZMMBZ5235BLT3G
- Part No.:
- SZMMBZ5235BLT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5235BLT3G.pdf
- Description:
- DIODE ZENER 6.8V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,793
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Product details
Overview
SZMMBZ5235BLT3G from onsemi is a 6.8 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 5 Ω dynamic impedance at 20 mA test current and 3 μA leakage current at 5 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZMMBZ5235BLT3G 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 diode with cathode-anode polarity, designed for stable reverse-bias regulation under controlled current conditions. Its 6.8 V nominal Zener voltage exhibits low temperature coefficient near zero crossing, and it maintains specified performance across −65°C to +150°C junction temperature range.
The SOT-23 package supports automated placement and reflow soldering per JEDEC J-STD-020, with 260°C max soldering temperature for 10 seconds. Pin 2 is internally unconnected - confirmed by mechanical outline Style 8 and electrical characterization tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.46–7.14 V at 20 mA - defines tight 6.8 V ±5% regulation window for stable reference generation |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZT) | 5 Ω at IZT = 20 mA - ensures minimal output voltage variation under load transients |
| Leakage Current (IR) | 3 μA at VR = 5 V - guarantees low standby current in battery-powered circuits |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust handling in manufacturing and end-use environments |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient conditions |
Pinout & Package
SZMMBZ5235BLT3G uses the industry-standard SOT-23 (TO-236) plastic surface-mount package, measuring 2.90 × 1.30 × 1.00 mm, with void-free thermosetting epoxy case and corrosion-resistant finish. Polarity is marked by cathode band on terminal 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward current entry / reverse-bias reference return path; connects to lower-potential rail |
| 2 | No Connection | Internally isolated; no electrical function - must remain unconnected on PCB |
| 3 | Cathode | Zener regulation output node; connects to higher-potential rail or regulated voltage point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and infotainment power supplies |
| Pb-Free, Halogen-Free | Complies with RoHS Directive 2011/65/EU and JEDEC JS709C for green electronics manufacturing |
| Low Dynamic Impedance | 5 Ω at 20 mA enables <10 mV output shift under ±5 mA load change - critical for analog sensor references |
| High ESD Robustness | >16 kV HBM rating eliminates need for external TVS in handheld device front-end protection |
| Small Outline Footprint | SOT-23 size allows placement adjacent to IC power pins - minimizes trace inductance in LDO feedback paths |
Applications
| USB Power Rail Protection | Automotive Cabin Controller Reference |
|---|---|
Use Scenario: Clamping transient spikes on 5 V USB VBUS lines in portable accessories. IC Role / Device Role / Timing Role: Zener voltage clamp placed between VBUS and ground, conducting only during overvoltage events. Use Value: Prevents damage to downstream USB PHY ICs without adding series resistance or latency - leverages 225 mW rating and 3 μA leakage. |
Use Scenario: Providing stable 6.8 V reference for ADC input scaling in HVAC control modules. IC Role / Device Role / Timing Role: Precision shunt reference connected to microcontroller's internal ADC reference pin. Use Value: Enables 12-bit measurement accuracy across −40°C to +105°C ambient due to AEC-Q101 qualification and low TC near 6.8 V. |
| Smartphone Battery Monitor Circuit | Industrial PLC Input Conditioning |
Use Scenario: Biasing voltage divider networks that feed fuel gauge ICs monitoring Li-ion cell voltage. IC Role / Device Role / Timing Role: Stable Zener node establishing known midpoint in resistive divider for accurate voltage scaling. Use Value: Maintains <±1% reference error over full temperature range - critical for SOC estimation algorithms. |
Use Scenario: Level-shifting and clamping 24 V digital inputs to 5 V logic thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Shunt regulator limiting input voltage to optocoupler LED anode while sinking excess current. Use Value: Eliminates need for external series resistor and reduces BOM count - enabled by 5 Ω ZZT and 225 mW PD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5235BLT1G | Same Zener voltage (6.46–7.14 V), identical SOT-23 package, but non-automotive grade and not AEC-Q101 qualified | Lacks PPAP capability and automotive traceability - suitable only for commercial-grade consumer electronics | Select when cost sensitivity outweighs automotive compliance requirements and lifecycle management needs |
| SZMMBZ5235BLT1G | Identical electrical specs and AEC-Q101 qualification, but supplied in 3,000-piece tape-and-reel vs. 10,000-piece for SZMMBZ5235BLT3G | Same functional performance; differs only in packaging quantity - impacts procurement logistics and reel change frequency | Choose for prototyping or low-volume production where smaller reels reduce inventory holding time |
Compared with MMBZ5235BLT1G and SZMMBZ5235BLT1G, SZMMBZ5235BLT3G delivers identical regulation performance with full automotive qualification and optimized high-volume packaging - making it the preferred choice for Tier 1 OEM programs requiring PPAP documentation and long-term supply continuity.
Availability
SZMMBZ5235BLT3G is available at Aetrix Electronics and suitable for automotive cabin electronics, portable medical monitors, and industrial sensor signal conditioning requiring stable component supply, AEC-Q101 compliance, and high-reliability Zener regulation.
Supply support for SZMMBZ5235BLT3G 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 infrastructure.
SZMMBZ5235BLT3G belongs to the SZMMBZ52xxBLTxG automotive Zener diode family, engineered specifically for high-reliability voltage reference and transient suppression in safety-critical systems where AEC-Q101 validation and PPAP readiness are mandatory.
FAQ
What is the Zener voltage tolerance of SZMMBZ5235BLT3G?
The SZMMBZ5235BLT3G has a Zener voltage range of 6.46 V to 7.14 V at 20 mA test current, corresponding to a nominal 6.8 V ±5% tolerance. This specification is verified per onsemi's Electrical Characteristics table on page 3 of the July 2024 datasheet revision, and applies under standard test conditions of TA = 25°C with pulse testing to minimize self-heating effects on SZMMBZ5235BLT3G performance.
Is SZMMBZ5235BLT3G pin-compatible with MMBZ5235BLT1G?
Yes, SZMMBZ5235BLT3G shares identical pinout (Anode–NC–Cathode) and SOT-23 package dimensions with MMBZ5235BLT1G, as confirmed by Style 8 mechanical outline in the onsemi package drawing. However, SZMMBZ5235BLT3G adds AEC-Q101 qualification and automotive-specific process controls - meaning PCB layout remains unchanged, but reliability assurance is elevated for automotive use cases involving SZMMBZ5235BLT3G.
What is the maximum power dissipation of SZMMBZ5235BLT3G on FR-5 board?
SZMMBZ5235BLT3G is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient temperature, with linear derating of 1.8 mW/°C above that temperature. This value is defined in the Maximum Ratings table on page 1 of the official onsemi datasheet and reflects thermal performance under standardized JEDEC test board conditions - critical for thermal design margining in compact SZMMBZ5235BLT3G implementations.
Does SZMMBZ5235BLT3G have an ESD rating, and if so, what is it?
SZMMBZ5235BLT3G carries an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM), as stated in the Features section of the onsemi datasheet. This high-level ESD robustness is built into the device structure and validated during qualification - eliminating the need for additional external ESD protection in many portable and automotive interface designs using SZMMBZ5235BLT3G.
What does the "SZ" prefix indicate in SZMMBZ5235BLT3G?
The "SZ" prefix in SZMMBZ5235BLT3G denotes onsemi's automotive-grade variant, signifying unique site and process controls, AEC-Q101 qualification, PPAP capability, and enhanced traceability for automotive supply chains. It is not merely a marking distinction - the SZMMBZ5235BLT3G undergoes additional stress testing and lot-level documentation beyond commercial MMBZ5235BLT1G, ensuring consistent performance in demanding vehicle environments where SZMMBZ5235BLT3G is deployed.
SZMMBZ5235BLT3G 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):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 5 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)
SZMMBZ5235BLT3G FAQ
1.How can I place an order for SZMMBZ5235BLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5235BLT3G 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 SZMMBZ5235BLT3G reliable?
The price and inventory of SZMMBZ5235BLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5235BLT3G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5235BLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5235BLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5235BLT3G?
SZMMBZ5235BLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5235BLT3G 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 SZMMBZ5235BLT3G?
For technical support, including SZMMBZ5235BLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5235BLT3G requirements.
6.How does Aetrix verify that SZMMBZ5235BLT3G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5235BLT3G 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 SZMMBZ5235BLT3G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5235BLT3G?
All SZMMBZ5235BLT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5235BLT3G, 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 SZMMBZ5235BLT3G part is unused and in its original packaging.
Return procedure for SZMMBZ5235BLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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