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onsemi 1SMA48CAT3G
- Part No.:
- 1SMA48CAT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
1SMA48CAT3G.pdf
- Description:
- TVS DIODE 48VWM 77.4VC 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,705
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Product details
Overview
1SMA48CAT3G 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 48 V working peak reverse voltage (VRWM), 53.3–58.91 V breakdown voltage (VBR) at 1 mA, 77.4 V clamping voltage (VC) at 5.2 A peak pulse current, and <1 ns response time. It is used to protect automotive ECUs, industrial power supplies, and communication interfaces against ESD and lightning-induced surges.
For engineers reviewing the 1SMA48CAT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to IC absolute maximum ratings, junction capacitance (135 pF @ 0 V), thermal derating above 75°C, and AEC-Q101 qualification for automotive deployment.
Technical Context
The 1SMA48CAT3G operates as a bidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp both positive and negative transients symmetrically. Its low zener impedance ensures stable clamping under surge conditions, and its flat handling surface supports precise automated placement on PCBs.
It is rated for 400 W peak pulse power (10/1000 µs waveform), with thermal resistance of 50 °C/W (junction-to-lead) and 250 °C/W (junction-to-ambient). The device is Pb-free, SURMETIC®-packaged, and qualified to AEC-Q101 for automotive use - requiring no external bias or control circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Power Dissipation | 400 W @ 1 ms (10/1000 µs waveform); defines maximum single-event surge energy it can absorb without failure |
| Working Peak Reverse Voltage (VRWM) | 48 V; must be ≥ continuous operating voltage of protected line to avoid leakage or conduction during normal operation |
| Breakdown Voltage (VBR) | 53.3–58.91 V @ 1 mA; specifies onset of avalanche conduction and sets lower bound of clamping window |
| Clamping Voltage (VC) | 77.4 V @ 5.2 A IPP; maximum voltage seen by downstream circuit during specified surge event |
| Junction Capacitance | 135 pF @ 0 V, 1 MHz; impacts high-frequency signal integrity in data-line protection applications |
| ESD Rating | Class 3 (>16 kV HBM); qualifies for robust electrostatic discharge immunity in handling and end-use environments |
| Response Time | <1 ns; ensures suppression initiates before transient propagates into sensitive ICs |
Pinout & Package
1SMA48CAT3G is housed in an SMA (DO-214AC) surface-mount package (Case 403D), measuring 4.06–4.57 mm in length (E), 2.29–2.92 mm in width (D), and 1.97–2.20 mm in height (A), with gull-wing leads and cathode polarity indicated by a band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal for reverse-biased operation | Connected to lower-potential side of protected line; forms symmetrical clamping path with cathode |
| Cathode | Negative terminal (marked with band) | Connected to higher-potential side; enables bidirectional clamping when paired with anode in AC or floating systems |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal/power lines without polarity constraints |
| AEC-Q101 qualification | Validated for automotive under-hood and body-control module applications per stress test requirements |
| Low-profile SURMETIC® package | Enables high-density PCB layouts and compatibility with standard SMT reflow profiles (260°C/10 s max) |
| Flat handling surface | Improves pick-and-place accuracy and reduces tombstoning risk during automated assembly |
| 135 pF junction capacitance | Acceptable for <10 Mbps data lines (e.g., CAN, RS-485) but not high-speed USB or Ethernet |
Applications
| Automotive Body Control Module (BCM) | Industrial 24/48 V DC Power Supply Input |
|---|---|
Use Scenario: Protects microcontroller I/O and LIN bus transceivers from load-dump and jump-start transients in vehicle BCMs. IC Role / Device Role: Bidirectional overvoltage clamp placed across power rail or signal line, referenced to ground. Use Value: Limits voltage to ≤77.4 V during 400 W surges, preventing latch-up or permanent damage to 5 V/3.3 V logic and transceivers. |
Use Scenario: Shields switching regulator inputs and PMICs from induced surges in factory automation power distribution panels. IC Role / Device Role: Primary transient suppressor mounted at board edge, shunting surge current to chassis ground. Use Value: Withstands 5.2 A peak pulses while maintaining clamping below 80 V, preserving downstream converter reliability. |
| Telecom Remote Radio Unit (RRU) Power Interface | Medical Infusion Pump Motor Driver Stage |
Use Scenario: Guards PoE-powered remote radio unit DC input against lightning-induced common-mode surges on outdoor cabling. IC Role / Device Role: Bidirectional TVS on 48 V DC input, coordinated with common-mode chokes and Y-capacitors. Use Value: 135 pF capacitance avoids degrading 100BASE-TX signal integrity; 48 V VRWM matches IEEE 802.3af/at nominal supply. |
Use Scenario: Safeguards H-bridge gate drivers and current-sense amplifiers from back-EMF spikes during stepper motor commutation. IC Role / Device Role: Localized clamping device placed adjacent to motor driver IC output pins. Use Value: Sub-1 ns response captures fast inductive kickback; 77.4 V VC stays within 85 V absolute max rating of typical motor driver ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA48CAT3G | AEC-Q101 certified with enhanced process controls; identical electrical specs and package | Required for PPAP-compliant automotive production; same footprint and layout | Select SZ prefix when automotive APQP documentation and traceability are mandatory |
| SMCJ48CA | Higher 1500 W peak power rating; larger SMC (DO-214AB) package; 70.1 V VC @ 21.4 A | Suitable for higher-energy surges (e.g., 10/1000 µs >100 A); requires larger PCB area | Choose SMCJ48CA only if system-level surge testing exceeds 400 W; not drop-in compatible due to size and thermal mass |
Compared with SZ1SMA48CAT3G, the 1SMA48CAT3G offers identical protection performance but lacks full PPAP documentation; versus SMCJ48CA, it provides space-constrained 400 W suppression without redesigning layout or thermal management.
Availability
1SMA48CAT3G is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and telecom infrastructure requiring stable component supply and long-term manufacturability.
Supply support for 1SMA48CAT3G 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 manufacturer specializing in power management, analog, sensor, and discrete devices for automotive, industrial, and communications markets.
The 1SMAxxCAT3G series belongs to ON Semiconductor's transient voltage suppressor product line, engineered specifically for cost-sensitive, high-reliability overvoltage protection in automotive and industrial systems where AEC-Q101 compliance and robust surge handling are essential.
FAQ
What is the clamping voltage of the 1SMA48CAT3G under a standard 10/1000 µs surge?
The 1SMA48CAT3G has a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current (IPP), tested per the 10/1000 µs waveform defined in the datasheet. This value represents the upper voltage limit imposed on the protected circuit during a standardized surge event and must be compared directly against the absolute maximum ratings of downstream components to ensure safe operation. The 1SMA48CAT3G maintains this clamping performance across its specified operating temperature range.
Is the 1SMA48CAT3G suitable for protecting CAN bus lines?
The 1SMA48CAT3G is not recommended for direct CAN bus line protection due to its 135 pF junction capacitance, which exceeds the ~50 pF typical limit for reliable 1 Mbps CAN FD operation. While its 48 V VRWM aligns with 24 V automotive systems, the capacitance would degrade signal edge rates and increase bit error rates. For CAN, lower-capacitance TVS devices such as NUP2105L or SM712 are preferred. The 1SMA48CAT3G remains appropriate for CAN controller power rail protection.
Does the 1SMA48CAT3G require a heatsink for continuous operation?
No, the 1SMA48CAT3G is not intended for continuous power dissipation; it is rated for non-repetitive 400 W surges (1 ms). Its DC power dissipation is limited to 0.5 W at 25°C ambient, derating linearly above that temperature. In normal operation, it draws negligible current below VRWM. Therefore, no heatsink is required - thermal design focuses on PCB copper area (e.g., 1 in² FR-4 pad) to support transient energy dissipation and meet the 50 °C/W junction-to-lead thermal resistance specification.
How does the 1SMA48CAT3G differ from unidirectional TVS diodes like 1SMA48AT3G?
The 1SMA48CAT3G is bidirectional, meaning it clamps voltage transients of either polarity symmetrically across its terminals, making it suitable for AC lines, floating grounds, or differential signals. In contrast, the unidirectional 1SMA48AT3G functions as a single-polarity Zener clamp - conducting only when cathode voltage exceeds anode by ≥VBR - and is used on DC rails referenced to ground. Their VRWM, VBR, and VC values differ numerically due to distinct test configurations; the "C" suffix explicitly denotes bidirectional construction in ON Semiconductor's naming convention.
Can the 1SMA48CAT3G be used in place of the 1SMA47CAT3G in an existing design?
No - the 1SMA48CAT3G (48 V VRWM) and 1SMA47CAT3G (47 V VRWM) are distinct parts with non-interchangeable breakdown and clamping characteristics. The 1SMA48CAT3G has a VBR range of 53.3–58.91 V and VC of 77.4 V, whereas the 1SMA47CAT3G has VBR of 52.2–57.7 V and VC of 75.7 V. Swapping them may violate voltage margin requirements for protected ICs. Always verify VRWM ≥ system operating voltage and VC ≤ downstream IC absolute maximum ratings before substitution. The 1SMA48CAT3G must be validated independently in the target application.
1SMA48CAT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- 6-WDFN Exposed Pad
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 135pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN-EP (3x3)
1SMA48CAT3G FAQ
1.How can I place an order for 1SMA48CAT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA48CAT3G 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 1SMA48CAT3G reliable?
The price and inventory of 1SMA48CAT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA48CAT3G is usually 5 days.
3.What payment methods are accepted for 1SMA48CAT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA48CAT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA48CAT3G?
1SMA48CAT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA48CAT3G 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 1SMA48CAT3G?
For technical support, including 1SMA48CAT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA48CAT3G requirements.
6.How does Aetrix verify that 1SMA48CAT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA48CAT3G 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 1SMA48CAT3G meets industry standards.
7.What is the process for return or replacement of 1SMA48CAT3G?
All 1SMA48CAT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA48CAT3G, 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 1SMA48CAT3G part is unused and in its original packaging.
Return procedure for 1SMA48CAT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA48CAT3G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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