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onsemi SZMMBZ20VALT3G
- Part No.:
- SZMMBZ20VALT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ20VALT3G.pdf
- Description:
- TVS DIODE 17VWM 28VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,831
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Product details
Overview
SZMMBZ20VALT3G from onsemi is a dual common-anode Zener diode array in SOT-23 package, designed for transient overvoltage and ESD protection of two independent signal lines. It features 20 V nominal Zener breakdown voltage (±5%), 40 W peak pulse power at 1.0 ms, clamping voltage of 28 V at 1.4 A peak pulse current, and IEC 61000-4-2 Level 4 ±30 kV contact discharge rating - deployed in USB interfaces, industrial I/O ports, and automotive sensor signal conditioning.
For engineers reviewing the SZMMBZ20VALT3G datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional/unidirectional configuration flexibility, low leakage (<50 nA @ 17 V), AEC-Q101 qualification, and space-constrained dual-line protection where board real estate is limited.
Technical Context
This device integrates two monolithic Zener junctions sharing a common anode (Pin 3), enabling either two separate unidirectional clamps (Pins 1–3 and 2–3) or one bidirectional clamp (Pins 1–2). Its thermal resistance is 417 °C/W on alumina substrate, supporting sustained operation up to +150 °C junction temperature.
The 20 V nominal breakdown is specified at 1.0 mA test current with ±5% tolerance and +1.4 mV/°C temperature coefficient. Clamping performance is validated per Figure 6 rectangular pulse (1.0 ms), delivering 28 V max VC at IPP = 1.4 A - critical for protecting 18–24 V logic and analog signal paths against fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VBR) | 19.0–21.0 V @ IT = 1.0 mA - defines precise clamping threshold for 20 V rail protection |
| Peak Pulse Power (Ppk) | 40 W @ 1.0 ms - sustains high-energy ESD surges without failure |
| Clamping Voltage (VC) | 28 V @ IPP = 1.4 A - limits transient voltage seen by downstream ICs |
| Reverse Leakage (IR) | <50 nA @ VRWM = 17 V - ensures minimal signal loading in standby |
| ESD Rating | ±30 kV contact discharge (IEC 61000-4-2 Level 4) - exceeds industrial immunity requirements |
| Package | SOT-23 (Case 318, Style 12) - surface-mount footprint measuring 2.90 × 1.30 × 1.00 mm |
| AEC-Q101 Qualified | Yes - certified for automotive-grade reliability and PPAP-capable production |
Pinout & Package
SOT-23 package (Case 318, Style 12) with gull-wing leads, 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 Zener cathode - connects to protected line 1 in unidirectional mode |
| Pin 2 | Cathode 2 | Second Zener cathode - connects to protected line 2 in unidirectional mode |
| Pin 3 | Anode (Common) | Shared anode node - ties both Zeners to GND or bias reference in standard layout |
Key Features
| Feature | Design Value |
|---|---|
| Dual Zener in single SOT-23 | Reduces PCB area by 50% vs. two discrete Zeners - critical for miniaturized USB-C and CAN FD modules |
| Configurable topology | Supports both unidirectional (line-to-GND) and bidirectional (line-to-line) ESD protection without redesign |
| Automotive-grade qualification | AEC-Q101 qualified and PPAP capable - enables direct use in ADAS camera links and body control modules |
| Low clamping voltage | 28 V VC at 1.4 A ensures protected ICs (e.g., RS-485 transceivers) remain within absolute maximum ratings |
| High ESD robustness | ±30 kV contact discharge meets IEC 61000-4-2 Level 4 - eliminates need for external TVS staging in cost-sensitive designs |
Applications
| USB 2.0 Data Line Protection | Automotive Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting D+ and D− lines of USB 2.0 ports against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor placed directly at connector, before USB PHY IC. Use Value: Prevents latch-up or damage to USB transceivers by clamping transients to ≤28 V while maintaining <50 nA leakage at 3.3 V bias. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in engine control units from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Common-anode Zener pair shunting sensor output lines to chassis ground during surge events. Use Value: Enables compliance with ISO 16750-2 pulse 5a (100 V/400 ms) via 40 W peak power handling and −55 °C to +150 °C operating range. |
| Industrial I/O Module Protection | RS-485 Transceiver Interface |
|
Use Scenario: Safeguarding digital input channels in PLC I/O cards exposed to field wiring transients and induced noise. IC Role / Device Role / Timing Role: Unidirectional clamp per channel (Pin 1–3 and Pin 2–3) referenced to system ground. Use Value: Achieves >100,000 ESD strikes endurance with no parameter shift due to monolithic die construction and AEC-Q101 process controls. |
Use Scenario: Protecting A/B differential lines of RS-485 transceivers in factory automation networks against cable discharge events. IC Role / Device Role / Timing Role: Bidirectional clamp between A and B lines (Pins 1–2), with common anode (Pin 3) tied to local ground. Use Value: Maintains signal integrity with <0.5 pF inter-pin capacitance (per Fig. 3), avoiding data rate degradation at 10 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMBZ20VALT1G | Same electrical specs but supplied in 3,000-unit 7-inch tape-and-reel (vs. 10,000-unit 13-inch for T3G) | Preferred for prototyping and low-volume builds; identical performance and footprint | Select when smaller reel quantities align with production planning or evaluation needs |
| SMF20A | Single-channel 20 V TVS diode in SOD-123; 200 W peak power but no dual-line integration | Requires two devices and extra routing for dual-line protection; higher board cost and area | Choose only if higher single-line surge rating is mandatory and layout space permits duplication |
Compared with SZMMBZ20VALT1G, the SZMMBZ20VALT3G offers identical protection performance with optimized logistics for high-volume manufacturing; versus SMF20A, it delivers true dual-line integration with 50% smaller footprint and simplified layout - making it superior for space-constrained, automotive-qualified designs.
Availability
SZMMBZ20VALT3G is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, and USB-C port hardening requiring stable component supply across extended product lifecycles.
Supply support for SZMMBZ20VALT3G 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 specializing in energy-efficient technologies for automotive, industrial, cloud, and IoT applications - with core expertise in protection, power management, and sensing solutions.
SZMMBZxxxALTxG series targets high-reliability transient suppression in safety-critical and space-constrained systems, emphasizing AEC-Q101 qualification, low-profile packaging, and multi-line integration for next-generation ECUs and edge controllers.
FAQ
What is the Zener breakdown voltage tolerance for SZMMBZ20VALT3G?
The SZMMBZ20VALT3G has a nominal Zener breakdown voltage of 20 V with a tolerance of ±5%, specified as 19.0 V minimum to 21.0 V maximum at IT = 1.0 mA. This tight tolerance ensures consistent clamping behavior across production lots and supports reliable interface protection in 18–24 V systems where voltage margin is constrained.
Can SZMMBZ20VALT3G be used in bidirectional ESD protection mode?
Yes, SZMMBZ20VALT3G supports bidirectional operation by connecting Pins 1 and 2 to the differential signal pair (e.g., RS-485 A/B) and tying Pin 3 (common anode) to ground. In this configuration, either cathode conducts during positive or negative transients - delivering symmetrical ±28 V clamping without polarity constraints.
Is SZMMBZ20VALT3G suitable for automotive applications?
Yes, SZMMBZ20VALT3G is AEC-Q101 qualified and PPAP capable, with full traceability, controlled manufacturing, and guaranteed operation from −55 °C to +150 °C. Its SZ prefix denotes automotive-specific site and change control - making it approved for use in engine control, ADAS, and body electronics where reliability under harsh conditions is mandatory.
What is the maximum clamping voltage of SZMMBZ20VALT3G under surge conditions?
The maximum clamping voltage (VC) of SZMMBZ20VALT3G is 28 V at a peak pulse current (IPP) of 1.4 A, measured per the 1.0 ms rectangular waveform in Figure 6 of the datasheet. This value represents the upper limit of voltage imposed on protected circuitry during worst-case ESD or surge events - ensuring compatibility with 30 V-tolerant interface ICs.
How does the SOT-23 package of SZMMBZ20VALT3G support high-density PCB layouts?
The SOT-23 package of SZMMBZ20VALT3G measures just 2.90 × 1.30 × 1.00 mm and integrates two Zener junctions in one footprint - eliminating the need for two discrete devices and their associated pads/traces. This reduces total protection area by ~50% compared to dual-SOD-323 layouts, enabling compact designs for wearables, telematics modules, and multi-port industrial gateways.
SZMMBZ20VALT3G 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):
- 17V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 28V
- Current - Peak Pulse (10/1000µs):
- 1.4A
- Power - Peak Pulse:
- 40W
- 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)
SZMMBZ20VALT3G FAQ
1.How can I place an order for SZMMBZ20VALT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ20VALT3G 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 SZMMBZ20VALT3G reliable?
The price and inventory of SZMMBZ20VALT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ20VALT3G is usually 5 days.
3.What payment methods are accepted for SZMMBZ20VALT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ20VALT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ20VALT3G?
SZMMBZ20VALT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ20VALT3G 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 SZMMBZ20VALT3G?
For technical support, including SZMMBZ20VALT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ20VALT3G requirements.
6.How does Aetrix verify that SZMMBZ20VALT3G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ20VALT3G 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 SZMMBZ20VALT3G meets industry standards.
7.What is the process for return or replacement of SZMMBZ20VALT3G?
All SZMMBZ20VALT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ20VALT3G, 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 SZMMBZ20VALT3G part is unused and in its original packaging.
Return procedure for SZMMBZ20VALT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ20VALT3G Tags
-
ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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