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Renesas SZSM12T1G
- Part No.:
- SZSM12T1G
- Manufacturer:
- Renesas
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
SZSM12T1G.pdf
- Description:
- STraVoltaSuppressDiod30012Unidir
- Quantity:
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Inventory:21,000
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Product details
Overview
SZSM12T1G from onsemi is a dual common-anode ESD protection diode array in SOT-23 package, designed for transient overvoltage and electrostatic discharge protection of two independent signal lines. It features a 12 V working peak reverse voltage, 13.3–15.75 V zener breakdown range, 300 W peak pulse power (8 × 20 µs), and low leakage current - ideal for protecting I/O ports in space-constrained computing and communication equipment.
For engineers reviewing the SZSM12T1G datasheet, SZSM12T1G pinout, SZSM12T1G application, or SZSM12T1G equivalent, key selection criteria include clamping voltage at 1 A (19 V), bidirectional/unidirectional configuration flexibility in SOT-23, IEC 61000-4-2 ±15 kV air/±8 kV contact ESD rating, and UL 94 V-0 flammability compliance.
Technical Context
This device implements two monolithic silicon zener junctions sharing a common anode (Pin 3), enabling dual-line protection with minimal PCB footprint. Its unidirectional operation (Pins 1–3 and 2–3) supports discrete line clamping, while the SOT-23 package allows either two separate unidirectional configurations or a single bidirectional setup via external routing.
Thermal performance is defined by RθJA = 556 °C/W on FR-5 board (225 mW dissipation) and 417 °C/W on alumina substrate (300 mW). The device meets IEC 61000-4-2 (ESD), -4-4 (EFT), and -4-5 (lightning surge) immunity standards, with specified clamping behavior under 8 × 20 µs pulse conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage | 12 V - Maximum continuous reverse voltage before significant conduction begins; sets operating margin for protected signal lines. |
| Zener Breakdown Voltage | 13.3–15.75 V @ 1 mA - Confirmed minimum/maximum turn-on threshold across production lot; ensures predictable clamping onset. |
| Clamping Voltage | 19 V @ 1 A peak pulse - Measured voltage across device during 8 × 20 µs transient; defines maximum stress imposed on downstream ICs. |
| Peak Pulse Power | 300 W (8 × 20 µs) - Transient energy-handling capability per IEC 61000-4-5; enables robust lightning/surge suppression. |
| ESD Rating | ±15 kV air / ±8 kV contact per IEC 61000-4-2 - Validated immunity level for human-body-model ESD events. |
| Leakage Current | 1.0 µA @ 12 V - Low standby current preserves signal integrity and minimizes power loss in high-impedance interfaces. |
| Capacitance | 95 pF @ 0 V - Measured junction capacitance; impacts high-speed signal integrity in data lines like USB or UART. |
Pinout & Package
SOT-23 package (Case 318, Style 12), void-free thermosetting plastic, UL 94 V-0 rated, optimized for automated assembly and reflow soldering at ≤260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Line 1) | Connects to first protected signal line; conducts transient current to common anode during overvoltage event. |
| Pin 2 | Cathode (Line 2) | Connects to second protected signal line; operates independently from Pin 1 but shares Pin 3 return path. |
| Pin 3 | Common Anode | Single connection point to ground or reference rail; enables dual-line protection with shared thermal and layout path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Reduces component count and PCB area by integrating two protection paths into one SOT-23 footprint. |
| Configurable unidirectional/bidirectional use | Supports either two independent unidirectional clamps (Pins 1–3 and 2–3) or external wiring for bidirectional protection. |
| IEC-compliant transient immunity | Validated to IEC 61000-4-2 (ESD), -4-4 (EFT), and -4-5 (surge) standards - simplifies system-level EMC certification. |
| Low clamping voltage drift | Maximum temperature coefficient of VBR ensures stable turn-on behavior across −55°C to +150°C junction range. |
| Flame-retardant housing | UL 94 V-0 rating confirms material compliance with safety standards for enclosed electronic enclosures. |
Applications
| Computer Interface Protection | Microprocessor I/O Protection |
|---|---|
|
Use Scenario: Protecting RS-232, USB, or parallel port lines in desktop peripherals against ESD and cable discharge events. IC Role / Device Role / Timing Role: Clamp transient energy before it reaches interface transceivers or microcontroller GPIO pins. Use Value: Prevents latch-up or permanent damage in host controllers without adding series resistance or degrading signal rise time. |
Use Scenario: Safeguarding address/data/control bus lines connected to CPUs, RAM, and ROM in embedded control modules. IC Role / Device Role / Timing Role: Zener-based voltage clamp placed directly at connector or IC pin to limit overshoot during hot-plug or ESD events. Use Value: Maintains functional reliability under repeated ±8 kV contact ESD strikes while preserving <100 ns response time. |
| Printer Terminal Protection | Medical Equipment Signal Line Protection |
|
Use Scenario: Shielding keyboard matrix scan lines and serial command interfaces in office printers from user-induced ESD. IC Role / Device Role / Timing Role: Dual-cathode configuration protects two independent scan lines using shared ground return (Pin 3). Use Value: Eliminates need for two discrete diodes, reducing BOM cost and layout complexity in tight-space front-panel designs. |
Use Scenario: Guarding analog sensor inputs and digital communication lines (e.g., SPI, I²C) in diagnostic devices exposed to clinical ESD environments. IC Role / Device Role / Timing Role: Low-leakage (<1 µA) clamping element that avoids DC loading of precision analog front-ends. Use Value: Ensures signal fidelity and measurement accuracy while meeting IEC 60601-1-2 ESD immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD5Z3.3T5G | Lower VRWM (3.3 V), lower clamping (8.5 V @ 1 A), higher capacitance (120 pF) | Better suited for low-voltage logic (1.8–3.3 V) interfaces; not rated for 12 V signal rails | Select when protecting 3.3 V GPIO or data lines where tighter clamping margin is required. |
| SMF12CT1G | Same VRWM (12 V), higher peak power (400 W), bidirectional-only configuration | Lacks dual-cathode flexibility; requires separate devices for multi-line unidirectional protection | Choose for higher-energy surge environments where 400 W pulse handling outweighs layout flexibility needs. |
Compared with SZSM12T1G, ESZ5Z3.3T5G offers tighter clamping for low-voltage systems but cannot support 12 V lines, while SMF12CT1G delivers greater surge robustness but sacrifices the dual-unidirectional routing advantage critical for compact I/O protection layouts.
Availability
SZSM12T1G is available at Aetrix Electronics and suitable for computer interface protection, microprocessor I/O safeguarding, and medical equipment signal line hardening requiring stable component supply and full traceability.
Supply support for SZSM12T1G 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
SZSM12T1G belongs to onsemi's ESD protection diode array product line, engineered specifically for high-density, multi-line transient suppression in space-constrained consumer and industrial electronics.
FAQ
What is the primary function of the SZSM12T1G?
The SZSM12T1G is a dual common-anode ESD protection diode array designed to clamp transient overvoltages on two independent signal lines. Its core function is to divert ESD and surge currents safely to ground while limiting voltage seen by downstream ICs to ≤19 V at 1 A pulse. This protects sensitive interfaces such as USB, RS-232, and microcontroller GPIOs without affecting normal signal operation.
Can the SZSM12T1G be used in bidirectional signal protection?
Yes, the SZSM12T1G can be configured for bidirectional protection by connecting external components - though its native structure is unidirectional (dual cathodes, common anode). For true bidirectional clamping per line, external series resistors and/or complementary diodes may be needed. The datasheet confirms SOT-23 packaging supports either two unidirectional configurations or a single bidirectional setup via board-level design.
What is the maximum operating temperature range for the SZSM12T1G?
The SZSM12T1G has a junction and storage temperature range of −55°C to +150°C. This wide range supports deployment in harsh environments including industrial control cabinets and medical equipment enclosures. Thermal derating begins above 25°C ambient, with power dissipation reduced by 1.8 mW/°C on FR-5 board and 2.4 mW/°C on alumina substrate.
Does the SZSM12T1G meet industry-standard ESD test requirements?
Yes, the SZSM12T1G is explicitly rated per IEC 61000-4-2: ±15 kV air discharge and ±8 kV contact discharge. It also meets IEC 61000-4-4 (40 A EFT) and IEC 61000-4-5 (12 A lightning surge) requirements. These validated ratings are documented in the "Maximum Ratings" table of the official onsemi datasheet (SM12T1/D, Rev. 1, Nov. 2017).
How does the SZSM12T1G compare to single-line ESD diodes in terms of PCB space?
The SZSM12T1G integrates two ESD protection paths into a single SOT-23 package (2.9 × 1.3 × 1.0 mm), occupying ~50% less board area than two discrete SOT-23 diodes. Its dual-cathode/common-anode architecture eliminates redundant ground traces and reduces routing congestion - a critical advantage in compact designs like portable medical sensors and printer control boards where space is constrained.
SZSM12T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SZSM12T1G FAQ
1.How can I place an order for SZSM12T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZSM12T1G 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 SZSM12T1G reliable?
The price and inventory of SZSM12T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZSM12T1G is usually 5 days.
3.What payment methods are accepted for SZSM12T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZSM12T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZSM12T1G?
SZSM12T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZSM12T1G 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 SZSM12T1G?
For technical support, including SZSM12T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZSM12T1G requirements.
6.How does Aetrix verify that SZSM12T1G is sourced from the original manufacturer or authorized distributors?
All SZSM12T1G 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 SZSM12T1G meets industry standards.
7.What is the process for return or replacement of SZSM12T1G?
All SZSM12T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZSM12T1G, 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 SZSM12T1G part is unused and in its original packaging.
Return procedure for SZSM12T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZSM12T1G Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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