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onsemi SZMMBZ6V8ALT3G
- Part No.:
- SZMMBZ6V8ALT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ6V8ALT3G.pdf
- Description:
- TVS DIODE 4.5VWM 9.6VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:14,325
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Product details
Overview
SZMMBZ6V8ALT3G from onsemi is a dual common-anode Zener diode array in SOT-23 package, designed for transient voltage suppression and ESD protection of two independent signal lines. It features 6.8 V nominal Zener breakdown voltage (±5% tolerance), 24 W peak pulse power rating at 1.0 ms, clamping voltage of 9.6 V at 2.5 A peak pulse current, and AEC-Q101 qualification for automotive applications.
For engineers reviewing the SZMMBZ6V8ALT3G datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional/unidirectional configuration flexibility, IEC 61000-4-2 Level 4 ±30 kV contact ESD rating, low leakage (<0.5 µA @ 4.5 V), and dual-line protection in space-constrained PCB layouts.
Technical Context
This device implements a monolithic dual-junction Zener structure with shared anode (Pin 3), enabling either two independent unidirectional clamps (Pins 1–3 and 2–3) or a single bidirectional clamp (Pins 1–2). Its thermal resistance of 556 °C/W on FR-5 board supports reliable surge energy dissipation under transient conditions.
The 6.8 V nominal breakdown is specified at 1 mA test current with ±5% tolerance and a temperature coefficient of +3.4 mV/°C, ensuring predictable voltage regulation across −55 °C to +150 °C operating range. Clamping performance is validated per Figure 6 rectangular pulse waveform (1.0 ms duration).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VBR) | 6.46–7.14 V @ IT = 1 mA; ensures precise overvoltage threshold for 5 V–6.8 V logic and interface lines |
| Clamping Voltage (VC) | 9.6 V @ IPP = 2.5 A; limits transient-induced stress on downstream ICs during ESD events |
| Peak Pulse Power | 24 W @ 1.0 ms (unidirectional); sustains high-energy transients without failure in industrial/commercial systems |
| ESD Rating | ±30 kV contact discharge per IEC 61000-4-2 Level 4; meets stringent system-level ESD immunity requirements |
| Leakage Current | <0.5 µA @ VRWM = 4.5 V; minimizes standby power loss and signal integrity impact in high-impedance circuits |
| Package | SOT-23 (Case 318); enables 2-line protection in footprint smaller than two discrete SOD-323 devices |
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress testing |
Pinout & Package
SOT-23 package (Case 318, Style 12), dimensions 2.90 × 1.30 × 1.00 mm, Pb-free and RoHS compliant. Designed for automated placement and reflow soldering at 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode 1 | First unidirectional Zener junction cathode; connects to protected line 1 |
| Pin 2 | Cathode 2 | Second unidirectional Zener junction cathode; connects to protected line 2 |
| Pin 3 | Anode (Common) | Shared anode node; ties both Zeners to ground or reference rail for dual-line clamping |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Enables simultaneous protection of two independent signal lines using one SOT-23 footprint - saves >50% board area vs. discrete solutions |
| Configurable unidirectional/bidirectional mode | Pins 1–3 and 2–3 support separate unidirectional clamping; Pins 1–2 enable bidirectional ESD suppression without external components |
| IEC 61000-4-2 Level 4 compliance | ±30 kV contact discharge rating ensures robustness against real-world ESD events in end-user environments |
| Low clamping ratio (VC/VBR ≈ 1.41) | Minimizes voltage overshoot during transients, reducing risk of latch-up or damage to 3.3 V/5 V interface ICs |
| AEC-Q101 qualification | Validated for automotive electronics including infotainment, body control, and ADAS sensor interfaces requiring long-term reliability |
Applications
| USB 2.0 Data Line Protection | Automotive CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting D+ and D− lines of USB 2.0 ports against ESD events during cable insertion/removal in industrial HMIs and medical devices. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor placed directly at connector, clamping fast-rising ESD pulses before they reach USB transceiver IC. Use Value: Prevents data corruption and port lockup by limiting voltage excursion to ≤9.6 V while maintaining signal integrity up to 480 Mbps. |
Use Scenario: Safeguarding CAN_H and CAN_L differential pair in automotive body control modules exposed to ISO 10605 and IEC 61000-4-2 threats. IC Role / Device Role / Timing Role: Common-anode Zener array providing symmetrical clamping to ground for both bus lines, preserving differential signaling margin. Use Value: Enables robust CAN communication under harsh electrical environments without adding series impedance or degrading bit timing. |
| Industrial Sensor Interface | POS Terminal Keypad ESD Protection |
|
Use Scenario: Protecting analog input channels (e.g., 4–20 mA loop receivers or thermocouple amplifiers) in PLC I/O modules from field-induced surges. IC Role / Device Role / Timing Role: Low-leakage (≤0.5 µA) Zener clamp placed at front-end filter stage to shunt transients without loading precision signal paths. Use Value: Maintains measurement accuracy while preventing op-amp saturation or ADC overrange due to induced transients. |
Use Scenario: Shielding matrix keypad scan lines in retail point-of-sale terminals from user-hand ESD during frequent button presses. IC Role / Device Role / Timing Role: Dual-cathode Zener suppressing ±30 kV contact discharges on multiple row/column lines with single-component solution. Use Value: Eliminates keypad freeze or phantom keypresses caused by ESD coupling into microcontroller GPIOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener transient protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMBZ6V8ALT1G | Same electrical specs but supplied in 3,000-unit 7-inch tape-and-reel; lacks extended reel size option | Preferred for low-volume prototyping or small-batch production where 10,000-unit reels are impractical | Select when matching existing SMT line setup optimized for 7-inch reels or when minimizing initial inventory commitment |
| ESD5Z6.8T5G | Single-line 6.8 V Zener (SOD-523), 12 W Ppk, lower clamping (8.5 V @ 1 A), no dual configuration | Requires two devices for dual-line protection; higher total footprint and assembly cost | Choose only if board layout allows separate placement and lower peak power (12 W vs. 24 W) suffices for target threat level |
Compared with SZMMBZ6V8ALT1G, the SZMMBZ6V8ALT3G offers identical protection performance with optimized logistics for high-volume manufacturing; versus ESD5Z6.8T5G, it delivers true dual-line integration, 100% higher surge capacity, and 30% smaller PCB area - critical for compact automotive and industrial modules.
Availability
SZMMBZ6V8ALT3G is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and medical device USB interfaces requiring stable component supply, AEC-Q101 compliance, and long-term lifecycle support.
Supply support for SZMMBZ6V8ALT3G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ/SZMMBZxxxALTxG series targets high-reliability transient suppression in space-constrained, ESD-sensitive systems - specifically engineered to replace discrete dual-diode arrays with monolithic, AEC-Q101-qualified Zener pairs.
FAQ
What is the maximum clamping voltage of the SZMMBZ6V8ALT3G during an ESD event?
The SZMMBZ6V8ALT3G exhibits a maximum clamping voltage of 9.6 V at a peak pulse current of 2.5 A, measured per the 1.0 ms rectangular waveform in Figure 6 of the datasheet. This value ensures downstream 5 V logic and interface ICs remain within safe operating voltage limits during IEC 61000-4-2 Level 4 ESD strikes. The clamping performance is guaranteed across the full operating temperature range of −55 °C to +150 °C.
How does the common-anode configuration of the SZMMBZ6V8ALT3G enable dual-line protection?
The SZMMBZ6V8ALT3G integrates two Zener junctions sharing Pin 3 (anode), with independent cathodes at Pins 1 and 2. When Pins 1 and 3 are connected across Line 1–GND, and Pins 2 and 3 across Line 2–GND, each junction operates as a unidirectional TVS. Alternatively, connecting Pins 1 and 2 to differential lines and Pin 3 to ground creates a bidirectional clamp - all within one SOT-23 footprint.
Is the SZMMBZ6V8ALT3G suitable for automotive applications?
Yes, the SZMMBZ6V8ALT3G carries the "SZ" prefix denoting AEC-Q101 qualification and PPAP capability. It has undergone stress testing for temperature cycling, high-temperature reverse bias, and ESD per automotive standards. Its −55 °C to +150 °C junction temperature range and robust 24 W surge rating make it appropriate for body electronics, infotainment, and sensor interface modules in passenger and commercial vehicles.
What is the leakage current specification for the SZMMBZ6V8ALT3G at its working voltage?
The SZMMBZ6V8ALT3G specifies a maximum reverse leakage current of 0.5 µA at a working peak reverse voltage (VRWM) of 4.5 V, measured at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance analog and digital input circuits, prevents battery drain in always-on systems, and avoids false triggering in precision voltage monitoring applications.
Can the SZMMBZ6V8ALT3G be used in bidirectional ESD protection mode?
Yes, the SZMMBZ6V8ALT3G supports bidirectional operation by connecting the protected differential pair (e.g., CAN_H and CAN_L) between Pins 1 and 2, with the common anode (Pin 3) tied to ground. In this configuration, either polarity transient forward-biases one Zener junction while reverse-biasing the other, achieving symmetrical clamping without external components - verified in the Typical Common Anode Applications section (page 6) of the datasheet.
SZMMBZ6V8ALT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 4.5V
- Voltage - Breakdown (Min):
- 6.46V
- Voltage - Clamping (Max) @ Ipp:
- 9.6V
- Current - Peak Pulse (10/1000µs):
- 2.5A
- Power - Peak Pulse:
- 24W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ6V8ALT3G FAQ
1.How can I place an order for SZMMBZ6V8ALT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ6V8ALT3G 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 SZMMBZ6V8ALT3G reliable?
The price and inventory of SZMMBZ6V8ALT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ6V8ALT3G is usually 5 days.
3.What payment methods are accepted for SZMMBZ6V8ALT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ6V8ALT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ6V8ALT3G?
SZMMBZ6V8ALT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ6V8ALT3G 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 SZMMBZ6V8ALT3G?
For technical support, including SZMMBZ6V8ALT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ6V8ALT3G requirements.
6.How does Aetrix verify that SZMMBZ6V8ALT3G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ6V8ALT3G 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 SZMMBZ6V8ALT3G meets industry standards.
7.What is the process for return or replacement of SZMMBZ6V8ALT3G?
All SZMMBZ6V8ALT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ6V8ALT3G, 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 SZMMBZ6V8ALT3G part is unused and in its original packaging.
Return procedure for SZMMBZ6V8ALT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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