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onsemi 1SMA24CAT3G
- Part No.:
- 1SMA24CAT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA24CAT3G.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:1,563
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Product details
Overview
1SMA24CAT3G from ON Semiconductor is a bidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. It features a 24 V working peak reverse voltage (VRWM), 28.11 V nominal breakdown voltage (VBR), 38.9 V clamping voltage (VC) at 10.3 A peak pulse current, and <1 ns response time. It is used in automotive power supply protection and industrial I/O interface surge suppression.
For engineers reviewing the 1SMA24CAT3G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. protected circuit's max operating voltage, peak pulse current capability under 10/1000 µs waveform, junction capacitance (260 pF @ 0 V), thermal derating above 75°C, and AEC-Q101 qualification status for automotive use.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its low zener impedance and fast sub-nanosecond response ensure effective suppression of ESD and lightning-induced surges before downstream components experience overstress.
The device uses a planar Zener junction structure in a void-free transfer-molded SMA package (Case 403D), with thermal resistance from junction-to-lead of 50°C/W and junction-to-ambient of 250°C/W on FR-4 board. It is rated for −65°C to +150°C operation and supports Pb-free reflow soldering at 260°C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; must exceed protected line's peak DC or AC voltage. |
| VBR @ IT=1.0 A | 28.11 V (nominal) - Zener breakdown threshold; defines onset of avalanche conduction under standardized test current. |
| VC @ IPP=10.3 A | 38.9 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPK | 400 W @ 1 ms - Peak surge power handling; validates robustness against IEC 61000-4-5 Level 4 surges. |
| CJ @ 0 V, 1 MHz | 260 pF - Junction capacitance; impacts high-frequency signal integrity in data-line protection applications. |
| ESD Rating | Class 3 (>16 kV HBM) - Confirms suitability for environments with high human-body model electrostatic discharge risk. |
| Package | SMA (Case 403D) - Surface-mount plastic package with flat handling surface; compatible with standard SMT pick-and-place and reflow processes. |
Pinout & Package
SMA (Case 403D) is a 2-terminal surface-mount package with cathode polarity indicated by a band on one end. The device has no internal asymmetry-both terminals are electrically identical in bidirectional configuration. Mounting position is unrestricted; suitable for top-side or bottom-side PCB placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient current entry point during positive polarity surge | Conducts avalanche current when voltage exceeds VRWM in either direction; no functional distinction from cathode in bidirectional mode. |
| Cathode (banded end) | Transient current entry point during negative polarity surge | Same physical construction as anode; bidirectional symmetry means both terminals serve identical clamping roles depending on surge polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or floating power domains without external polarity management. |
| 400 W peak pulse power | Supports compliance with IEC 61000-4-5 (10/1000 µs) surge immunity up to Level 4 (4 kV line-to-ground) in properly designed layouts. |
| 260 pF junction capacitance | Minimizes signal distortion on moderate-speed digital lines (e.g., CAN, LIN, UART) while maintaining effective surge suppression. |
| AEC-Q101 qualified | Validated for automotive powertrain and chassis applications requiring extended temperature range (−65°C to +150°C) and long-term reliability. |
| Pb-free SURMETIC® package | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow standards; enables compatibility with lead-free manufacturing processes. |
Applications
| Automotive Power Supply Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 24 V vehicle battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary clamping element placed at power entry point before DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤38.9 V, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies downstream. | Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end transient suppressor mounted directly at terminal block, before optocoupler or Schmitt trigger input stage. Use Value: Absorbs >10 A surge currents without degradation, preserving signal integrity and reducing false triggering in noisy factory environments. |
| Medical Equipment Power Rails | Telecom Line Interface Protection |
Use Scenario: Safeguarding isolated 12–24 V auxiliary power supplies in diagnostic imaging systems from ESD and switching noise. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary filtering, ensuring clean bias for analog front-ends and ADC references. Use Value: Sub-1 ns response prevents transient coupling into sensitive analog measurement circuits, maintaining diagnostic accuracy. | Use Scenario: Protecting RS-232/RS-485 transceivers connected to long external cables exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair (A/B) and common-mode (GND) to suppress both differential and common-mode transients. Use Value: Symmetrical clamping maintains signal balance and avoids skew; 260 pF capacitance avoids attenuation of 1 Mbps+ data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA24CAT3G | Identical electrical specs; AEC-Q101 certified with enhanced process controls and PPAP documentation support. | Required for automotive OEM production programs demanding full PPAP compliance and lot traceability. | Select SZ1SMA24CAT3G when automotive qualification and supply chain audit readiness are mandatory. |
| 1.5SMC24CA | Higher 1500 W peak power rating; larger SMC package (7.1 mm × 6.2 mm); 33.2 V clamping voltage at 45.5 A. | Better suited for high-energy surges (e.g., 10/1000 µs, 6 kV) where PCB space allows larger footprint. | Choose 1.5SMC24CA only if system-level surge testing exceeds 400 W requirements and layout accommodates SMC outline. |
Compared with 1SMA24CAT3G, SZ1SMA24CAT3G offers identical protection performance with added automotive-grade process rigor, while 1.5SMC24CA trades compact size for higher surge capacity-making the 1SMA24CAT3G optimal for space-constrained 24 V rail protection where 400 W suffices.
Availability
1SMA24CAT3G is available at Aetrix Electronics and suitable for automotive electronics, industrial PLC I/O modules, medical power supplies, and telecom line interface designs requiring stable component supply and consistent surge immunity performance.
Supply support for 1SMA24CAT3G 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1SMA24CAT3G belongs to ON Semiconductor's SMA-series transient voltage suppressors-a family engineered for cost-effective, high-reliability overvoltage protection in surface-mount power and signal line applications.
FAQ
What is the clamping voltage of the 1SMA24CAT3G under a 10/1000 µs surge?
The 1SMA24CAT3G exhibits a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 10.3 A under the standardized 10/1000 µs double-exponential surge waveform. This value is measured per Figure 2 in the official ON Semiconductor datasheet and defines the upper voltage limit imposed on protected circuits during transient events.
Is the 1SMA24CAT3G suitable for automotive applications?
Yes, the 1SMA24CAT3G meets AEC-Q101 stress test requirements for transient voltage suppressors and operates reliably from −65°C to +150°C. While the base 1SMA24CAT3G variant is qualified, the SZ-prefix version (SZ1SMA24CAT3G) adds PPAP capability and site-specific control-making 1SMA24CAT3G appropriate for non-PPAP automotive subsystems like body control modules and infotainment power rails.
How does the bidirectional nature of the 1SMA24CAT3G affect its circuit placement?
The 1SMA24CAT3G's bidirectional architecture eliminates polarity sensitivity, allowing it to be placed across any two nodes requiring symmetrical overvoltage protection-such as differential signal pairs (RS-485 A/B), AC-coupled lines, or floating power domains. Unlike unidirectional TVS diodes, no orientation check is needed during assembly, simplifying layout and reducing manufacturing error risk for the 1SMA24CAT3G.
What is the junction capacitance of the 1SMA24CAT3G and how does it impact high-speed signals?
The 1SMA24CAT3G has a typical junction capacitance of 260 pF measured at 0 V bias and 1 MHz. This value introduces minimal loading on low-to-medium speed digital interfaces (e.g., CAN FD up to 5 Mbps, RS-485 up to 20 Mbps), but may attenuate signal edges in >100 Mbps applications. For such cases, lower-capacitance TVS devices should be evaluated alongside the 1SMA24CAT3G.
Can the 1SMA24CAT3G replace a unidirectional TVS in a DC power rail?
Yes, the 1SMA24CAT3G can replace a unidirectional TVS on a DC rail, provided the design accounts for its symmetrical clamping behavior: it will conduct during both positive overvoltage and negative-going transients (e.g., reverse battery connection). In pure DC systems where only positive surges are expected, a unidirectional device may offer slightly lower leakage-but the 1SMA24CAT3G remains functionally valid and widely deployed in 24 V automotive and industrial rails.
1SMA24CAT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 260pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA24CAT3G FAQ
1.How can I place an order for 1SMA24CAT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA24CAT3G 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 1SMA24CAT3G reliable?
The price and inventory of 1SMA24CAT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA24CAT3G is usually 5 days.
3.What payment methods are accepted for 1SMA24CAT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA24CAT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA24CAT3G?
1SMA24CAT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA24CAT3G 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 1SMA24CAT3G?
For technical support, including 1SMA24CAT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA24CAT3G requirements.
6.How does Aetrix verify that 1SMA24CAT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA24CAT3G 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 1SMA24CAT3G meets industry standards.
7.What is the process for return or replacement of 1SMA24CAT3G?
All 1SMA24CAT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA24CAT3G, 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 1SMA24CAT3G part is unused and in its original packaging.
Return procedure for 1SMA24CAT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA24CAT3G Tags
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onsemi
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