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onsemi SZMMBZ5234BLT3
- Part No.:
- SZMMBZ5234BLT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5234BLT3.pdf
- Description:
- DIODE ZENER 6.2V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
SZMMBZ5234BLT3 from onsemi is a 6.2 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board and featuring 7 Ω dynamic impedance at 20 mA test current. It provides precision voltage regulation in space-constrained applications such as portable battery protection circuits, USB port overvoltage clamping, and low-power sensor biasing networks.
For engineers reviewing the SZMMBZ5234BLT3 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), low leakage current (≤5 µA at 4 V), AEC-Q101 qualification for automotive use, and Pb-free SOT-23 packaging compatible with automated surface-mount assembly.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, where reverse breakdown occurs at nominal 6.2 V with temperature coefficient near zero (≈0 mV/°C) in this voltage range. Its 225 mW rating is specified under defined PCB thermal conditions (FR-5, 1.0 × 0.75 × 0.62 in), and derating follows 1.8 mW/°C above 25°C ambient.
The SOT-23 package has three terminals: Pin 1 (Anode), Pin 2 (No Connection), Pin 3 (Cathode), with cathode identified by a polarity band. ESD robustness exceeds 16 kV per Human Body Model, and junction temperature range spans −65°C to +150°C - enabling operation in automotive under-hood and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.2 V nominal, 5.89–6.51 V min/max at IZT = 20 mA - ensures stable reference within ±5% across production lot |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C - defines maximum continuous DC power before thermal derating applies |
| Zener Impedance (ZZT) | 7 Ω max at IZT = 20 mA - determines output voltage stability under load transients |
| Leakage Current (IR) | ≤5 µA at VR = 4 V - critical for low-power standby circuits where quiescent current must be minimized |
| ESD Rating | Class 3 (>16 kV HBM) - supports handling and assembly without external protection in consumer handheld designs |
| Junction Temp Range | −65°C to +150°C - enables deployment in automotive engine control units and industrial motor drives |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount plastic package with void-free thermosetting epoxy, corrosion-resistant finish, and UL 94 V-0 flammability rating. Maximum soldering temperature is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during non-regulation states |
| 2 | No Connection | Internally unconnected; no electrical function - must remain floating on PCB layout |
| 3 | Cathode | Connected to higher-potential node; polarity band identifies this terminal for correct orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including body electronics and infotainment power rails |
| Pb-Free Packaging | SZ prefix and "G" suffix indicate RoHS-compliant construction meeting J-STD-609 Category 1 requirements |
| Low Dynamic Impedance | 7 Ω at 20 mA enables tight regulation under varying load conditions in feedback loops |
| High ESD Robustness | Class 3 HBM (>16 kV) eliminates need for external TVS in many USB and I/O interface designs |
| Small Form Factor | SOT-23 footprint (2.9 mm × 1.3 mm) supports high-density PCB layouts in smartphones and wearables |
Applications
| Battery Protection Circuit | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Monitoring lithium-ion cell voltage during charging to prevent overvoltage damage. IC Role / Device Role / Timing Role: Zener diode acts as precision shunt reference in comparator-based cutoff circuit. Use Value: Tight 6.2 V tolerance ensures accurate 4.2 V per-cell threshold detection when used with resistive divider scaling. |
Use Scenario: Protecting downstream USB data lines from transient overvoltage events. IC Role / Device Role / Timing Role: Shunt clamp activated during >5.5 V excursions to divert surge current away from PHY ICs. Use Value: 7 Ω ZZT minimizes clamping voltage overshoot, holding line voltage below 6.5 V during 1 A surges. |
| Low-Power Sensor Biasing | Automotive Cabin Controller Reference |
Use Scenario: Providing stable bias voltage to analog temperature or pressure sensors in IoT edge nodes. IC Role / Device Role / Timing Role: Passive voltage reference supplying regulated 6.2 V to sensor excitation circuitry. Use Value: ≤5 µA leakage at 4 V ensures <1 µW standby power draw - extending battery life in multi-year deployments. |
Use Scenario: Generating reference voltage for microcontroller ADC in HVAC control modules. IC Role / Device Role / Timing Role: AEC-Q101 qualified Zener supplies clean 6.2 V reference independent of main 12 V rail fluctuations. Use Value: −65°C to +150°C operating range maintains accuracy across full vehicle thermal envelope without calibration drift. |
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-C6V2 | Same 6.2 V nominal, but 350 mW rating on FR-4; ZZT = 10 Ω at 5 mA; not AEC-Q101 qualified | Higher power capability suits industrial power supply feedback, but lacks automotive qualification | Select when higher power margin is needed and automotive compliance is not required |
| MMSZ5234ET1G | Identical 6.2 V spec, same SOT-23 package, but rated 500 mW on FR-4; ZZT = 9 Ω at 20 mA; AEC-Q101 qualified | Higher power rating allows use in higher-current regulation paths without thermal derating concerns | Choose when board layout permits same footprint but system demands >225 mW continuous dissipation |
Compared with SZMMBZ5234BLT3, BZX84-C6V2 offers higher power but lacks automotive qualification, while MMSZ5234ET1G matches AEC-Q101 status and increases power headroom - making it suitable for thermally demanding automotive subsystems where 225 mW is insufficient.
Availability
SZMMBZ5234BLT3 is available at Aetrix Electronics and suitable for automotive cabin controllers, portable medical monitors, and USB-C power delivery protection circuits requiring stable component supply and long-term lifecycle support.
Supply support for SZMMBZ5234BLT3 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5234BLT3 belongs to the MMBZ52xxBLT1/SZMMBZ52xxBLT1G Zener regulator family, engineered for compact, high-reliability voltage reference and overvoltage protection in space- and power-constrained systems.
FAQ
What is the Zener voltage tolerance of SZMMBZ5234BLT3?
The SZMMBZ5234BLT3 has a Zener voltage tolerance of ±5%, with minimum 5.89 V and maximum 6.51 V measured at test current IZT = 20 mA and ambient temperature 25°C. This tolerance is guaranteed across production lots and supports precision voltage reference designs where tighter regulation than generic Zeners is required.
Is SZMMBZ5234BLT3 suitable for automotive applications?
Yes, SZMMBZ5234BLT3 is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating compliance for automotive and other applications requiring unique site and control change requirements. Its −65°C to +150°C junction temperature range and 16 kV HBM ESD rating make it appropriate for under-dash and engine bay modules.
What does the "T3" suffix mean in SZMMBZ5234BLT3?
The "T3" suffix indicates tape-and-reel packaging with 10,000 units per reel, optimized for high-volume automated SMT assembly. This differs from "T1" (3,000 units/reel) and aligns with standard SOT-23 feeder configurations used in pick-and-place equipment.
How is thermal derating applied to SZMMBZ5234BLT3?
SZMMBZ5234BLT3 is rated for 225 mW at 25°C ambient on FR-5 board, with linear derating of 1.8 mW/°C above that temperature. At 85°C ambient, maximum allowable power drops to 117 mW - a critical consideration for enclosed enclosures or high-temperature PCB locations.
Does SZMMBZ5234BLT3 have a connection on Pin 2?
No, Pin 2 of SZMMBZ5234BLT3 is internally not connected (NC). The device uses only Pins 1 (Anode) and 3 (Cathode) for electrical operation. PCB layout must leave Pin 2 unconnected - no trace or pad should tie it to ground, supply, or any other net.
SZMMBZ5234BLT3 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):
- 6.2 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 4 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)
SZMMBZ5234BLT3 FAQ
1.How can I place an order for SZMMBZ5234BLT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5234BLT3 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 SZMMBZ5234BLT3 reliable?
The price and inventory of SZMMBZ5234BLT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5234BLT3 is usually 5 days.
3.What payment methods are accepted for SZMMBZ5234BLT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5234BLT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5234BLT3?
SZMMBZ5234BLT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5234BLT3 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 SZMMBZ5234BLT3?
For technical support, including SZMMBZ5234BLT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5234BLT3 requirements.
6.How does Aetrix verify that SZMMBZ5234BLT3 is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5234BLT3 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 SZMMBZ5234BLT3 meets industry standards.
7.What is the process for return or replacement of SZMMBZ5234BLT3?
All SZMMBZ5234BLT3 units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5234BLT3, 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 SZMMBZ5234BLT3 part is unused and in its original packaging.
Return procedure for SZMMBZ5234BLT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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