My Inquiry
My Account
onsemi SMS15T1
- Part No.:
- SMS15T1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SMS15T1.pdf
- Description:
- TVS DIODE 15VWM 29VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:8,498
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMS15T1 from onsemi is a quad unidirectional ESD and surge protector in SC-74 package, rated for 15 V working peak reverse voltage (VRWM), 24 V clamping voltage (VC) at 12 A peak pulse current, and 350 W peak power dissipation (8 × 20 µs). It delivers Class N ESD protection (>25 kV HBM), IEC 61000-4-2 (15 kV air / 8 kV contact), and is AEC-Q101 qualified for automotive electronics.
For engineers reviewing the SMS15T1 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. protected IC VCC, capacitance (60–125 pF), unidirectional configuration per channel, and SC-74 footprint compatibility with space-constrained portable interfaces.
Technical Context
The SMS15T1 integrates four independent unidirectional TVS diodes in a single SC-74 (Case 318F) monolithic silicon die. Each channel features a Zener-based avalanche structure optimized for fast response (<1 ns) to ESD transients and robust 8/20 µs surge handling up to 23 A.
It operates with a 15 V working peak reverse voltage (VRWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, and clamps to ≤24 V at 12 A IPP - ensuring safe voltage limiting for 15 V rail protection without forward conduction during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15 V - Maximum continuous reverse voltage before leakage exceeds 1 µA; sets upper limit for protected signal or power rail. |
| VC @ IPP = 12 A | 24 V - Clamped voltage during 8/20 µs surge; must stay below protected IC's absolute maximum rating. |
| IPP Max | 23 A - Peak surge current capability per channel under IEC 61000-4-5; defines surge immunity level. |
| C @ 0 V, 1 MHz | 60–125 pF - Channel capacitance affecting high-speed signal integrity (e.g., USB 2.0, HDMI DDC). |
| ESD HBM | >25 kV - Human Body Model rating ensures robustness against handling-induced discharges. |
| IEC 61000-4-2 | 15 kV (air), 8 kV (contact) - Compliance with industrial and consumer ESD immunity standards. |
| Package | SC-74 (Case 318F) - 6-pin surface-mount package with 1.6 mm × 2.9 mm footprint; enables compact layout for multi-line protection. |
Pinout & Package
SC-74 package (Case 318F, Style 1) with 6-pin lead frame; body dimensions 1.6 mm × 2.9 mm × 1.1 mm (L × W × H); RoHS-compliant, Pb-free, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Common cathode connection for Channel 1; ties to protected line's positive side or VCC rail. |
| 2 | Anode | Anode of Channel 1; connects to ground or low-impedance return path for transient shunting. |
| 3 | Cathode | Cathode of Channel 2; isolates second protected line (e.g., data pair or auxiliary supply). |
| 4 | Cathode | Cathode of Channel 3; supports independent protection of third signal or power node. |
| 5 | Anode | Anode of Channels 2 & 3; shared anode node simplifies grounding but requires common return design. |
| 6 | Cathode | Cathode of Channel 4; completes quad-channel configuration for full-line interface protection. |
Key Features
| Feature | Design Value |
|---|---|
| Quad unidirectional configuration | Four independent TVS channels in one SC-74 package - reduces board area vs. discrete diodes and avoids bidirectional leakage on DC-coupled lines. |
| 350 W peak pulse power (8 × 20 µs) | Enables robust protection against lightning-induced surges and system-level transients in automotive and industrial environments. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD stress - suitable for infotainment, ADAS sensor interfaces. |
| Low clamping ratio (VC/VRWM ≈ 1.6) | Minimizes overvoltage exposure during surge events - critical for protecting 15 V logic or analog front-ends with tight voltage margins. |
| Capacitance range 60–125 pF | Compatible with medium-speed digital interfaces (e.g., CAN FD, RS-485, LVDS) without signal degradation or timing skew. |
Applications
| Automotive Infotainment Display Interface | Industrial RS-485 Communication Port |
|---|---|
|
Use Scenario: Protecting LVDS or FPD-Link video data lines between head unit and TFT display in vehicles exposed to load dump and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS array clamping transient overvoltage on differential pairs while preserving signal integrity. Use Value: Prevents latch-up or damage to display driver ICs during 15 kV air-gap ESD events and 23 A surge pulses per IEC 61000-4-5. |
Use Scenario: Shielding RS-485 transceiver pins (A/B/Y/Z) in factory automation gateways from induced surges on long cable runs. IC Role / Device Role / Timing Role: Quad-channel transient suppressor providing independent clamping per line with shared ground anode. Use Value: Maintains bus communication integrity under 23 A 8/20 µs surges while adding only 60–125 pF per line to avoid signal rise-time degradation. |
| USB 2.0 Host Port Protection | Portable Medical Sensor Hub |
|
Use Scenario: Safeguarding D+ and D− lines, VBUS, and ID pins on USB 2.0 host ports in handheld diagnostic devices. IC Role / Device Role / Timing Role: Four-channel unidirectional clamp preventing ESD-induced reset or data corruption on high-speed data lines. Use Value: Delivers >25 kV HBM and 8 kV IEC contact discharge protection without compromising USB 2.0 eye diagram due to controlled capacitance. |
Use Scenario: Protecting analog sensor inputs (ECG, SpO₂) and digital control lines in battery-powered patient monitors subjected to clinical ESD events. IC Role / Device Role / Timing Role: Low-leakage (IR < 1 µA @ VRWM) TVS array preserving signal accuracy on high-impedance biomedical front-ends. Use Value: Ensures no DC offset or noise injection into sensitive analog paths while meeting IEC 60601-1-2 ESD immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD and surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMS12T1G | 12 V VRWM, 19 V VC @ 15 A, higher capacitance (80–150 pF) | Better suited for 12 V systems (e.g., CAN, LIN) where lower clamping voltage is prioritized over bandwidth. | Select when protecting 12 V rails or interfaces requiring tighter clamping margin than SMS15T1 offers. |
| SMS24T1G | 24 V VRWM, 40 V VC @ 8 A, lower capacitance (40–75 pF) | Optimized for 24 V industrial power rails and high-speed lines where low capacitance outweighs clamping voltage. | Choose for 24 V systems or high-frequency signals (e.g., MIPI, PCIe) needing minimal capacitive loading. |
Compared with SMS12T1G and SMS24T1G, the SMS15T1 provides the optimal balance of clamping voltage (24 V), working voltage (15 V), and capacitance (60–125 pF) for mixed-signal interfaces operating near 15 V, such as automotive camera links or industrial analog I/O modules.
Availability
SMS15T1 is available at Aetrix Electronics and suitable for automotive infotainment, industrial RS-485 networks, and portable medical devices requiring stable component supply, AEC-Q101 compliance, and consistent SC-74 packaging.
Supply support for SMS15T1 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 focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.
The SMS05T1 series - including SMS15T1 - was designed specifically for compact, high-reliability ESD and surge protection in space-constrained, mission-critical electronic interfaces.
FAQ
What is the maximum clamping voltage of SMS15T1 under surge conditions?
The SMS15T1 clamps to a maximum of 24 V at 12 A peak pulse current (8 × 20 µs waveform), as specified in the Electrical Characteristics table. This value ensures protected circuits remain within safe operating limits during transient events. The SMS15T1 maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C) and is validated per IEC 61000-4-5.
Is SMS15T1 suitable for protecting USB 2.0 data lines?
Yes, SMS15T1 is suitable for USB 2.0 D+/D− line protection due to its 60–125 pF capacitance range and unidirectional configuration, which avoids DC bias disruption. Its 24 V clamping voltage safely covers USB 2.0 VBUS (5 V) and signal swings while delivering >25 kV HBM and 8 kV IEC contact ESD protection - all confirmed in the official onsemi datasheet for SMS15T1.
Does SMS15T1 have AEC-Q101 qualification?
Yes, SMS15T1 carries AEC-Q101 qualification and PPAP capability, as explicitly stated in the ordering information and features section of the onsemi datasheet. The SZ prefix variant (SZSMS15T1G) is designated for automotive applications requiring strict process controls, but the SMS15T1G itself shares the same qualification status and test records.
What is the thermal resistance (RJA) of SMS15T1 in SC-74 package?
The SMS15T1 has a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on an FR-5 board, per the Maximum Ratings table. This value reflects standard JEDEC test conditions and informs derating calculations - for example, at 25 °C ambient, the device supports 225 mW total power dissipation before thermal derating begins.
How does SMS15T1 differ from SMS05T1G in terms of voltage rating?
SMS15T1 is rated for 15 V working peak reverse voltage (VRWM) and 16.7–18.5 V breakdown (VBR), whereas SMS05T1G is rated for 5 V VRWM and 6.0–7.2 V VBR. This makes SMS15T1 appropriate for 12–15 V systems like automotive body control modules or industrial 15 V analog sensors, while SMS05T1G targets 3.3–5 V logic and USB applications - a distinction clearly defined in the Electrical Characteristics table.
SMS15T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 29V
- Current - Peak Pulse (10/1000µs):
- 12A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 60pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SMS15T1 FAQ
1.How can I place an order for SMS15T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMS15T1 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 SMS15T1 reliable?
The price and inventory of SMS15T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMS15T1 is usually 5 days.
3.What payment methods are accepted for SMS15T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMS15T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMS15T1?
SMS15T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMS15T1 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 SMS15T1?
For technical support, including SMS15T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMS15T1 requirements.
6.How does Aetrix verify that SMS15T1 is sourced from the original manufacturer or authorized distributors?
All SMS15T1 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 SMS15T1 meets industry standards.
7.What is the process for return or replacement of SMS15T1?
All SMS15T1 units undergo pre-shipment inspection (PSI). If there is an issue with SMS15T1, 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 SMS15T1 part is unused and in its original packaging.
Return procedure for SMS15T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMS15T1 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
