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onsemi 1SMA36CAT3
- Part No.:
- 1SMA36CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA36CAT3.pdf
- Description:
- TVS DIODE 36VWM 58.1VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,953
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Product details
Overview
1SMA36CAT3 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 36 V working peak reverse voltage (VRWM), 58.1 V clamping voltage (VC) at 6.9 A peak pulse current, and <1 ns response time. It is used in automotive power supply protection, industrial PLC I/O modules, and medical equipment surge interfaces.
For engineers reviewing the 1SMA36CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to protected IC absolute maximum ratings, junction capacitance (175 pF @ 0 V), thermal derating above 75°C, and AEC-Q101 qualification status for automotive deployment.
Technical Context
This device operates as a bidirectional avalanche diode, conducting symmetrically in both polarities once reverse voltage exceeds its breakdown threshold (40–44.21 V). Its low zener impedance and fast sub-nanosecond response enable effective suppression of ESD (Class 3 >16 kV HBM) and lightning-induced surges per IEC 61000-4-5.
The SMA package (Case 403D) provides thermal resistance of 50°C/W junction-to-lead and 250°C/W junction-to-ambient (on FR-4 with minimum footprint), supporting reliable 400 W 10/1000 µs pulse handling at TL = 25°C without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 36 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's peak DC or AC waveform voltage. |
| VBR (min/typ/max) | 40 / 42.11 / 44.21 V @ 1 mA - Confirmed avalanche onset range; determines actual turn-on threshold under test conditions. |
| VC @ IPP | 58.1 V @ 6.9 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by downstream components. |
| PPK | 400 W @ 1 ms - Peak non-repetitive surge power capability; validates robustness against IEC 61000-4-5 Level 4 transients. |
| CJ @ 0 V | 175 pF - Junction capacitance at zero bias; critical for high-speed data line protection where signal integrity must be preserved. |
| Response Time | <1 ns - Time from transient rise to conduction onset; ensures protection before sensitive logic or analog circuits are damaged. |
| ESD Rating | Class 3 (>16 kV HBM) - Validated human-body-model ESD immunity; supports direct interface with exposed connectors or buttons. |
Pinout & Package
Package: SMA (Surface Mount Assembly), Case 403D - Low-profile, void-free transfer-molded plastic housing with flat handling surface for automated placement; cathode polarity indicated by band marking (not notch); mountable in top-slide or bottom-board orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during positive transient | Connects to line being protected; conducts when voltage exceeds +VBR relative to cathode. |
| Cathode | Current entry terminal during negative transient | Typically tied to ground or common reference; completes bidirectional conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal paths without polarity constraints-e.g., RS-485, CAN bus, or audio lines. |
| 400 W peak pulse power | Withstands 10/1000 µs surges up to 6.9 A while limiting voltage to ≤58.1 V-sufficient for IEC 61000-4-5 Level 4 compliance. |
| AEC-Q101 qualified | Validated for automotive underhood and body-control applications requiring extended temperature operation (−65°C to +150°C). |
| Pb-free SURMETIC® package | RoHS-compliant construction with corrosion-resistant finish and solderability verified at 260°C for 10 s-compatible with standard reflow profiles. |
Applications
| Automotive Power Rail Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp ±100 V spikes within nanoseconds. Use Value: Limits voltage to ≤58.1 V during 400 W surges, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Shielding 4–20 mA current loop inputs in programmable logic controllers from field wiring surges. IC Role / Device Role / Timing Role: Transient suppressor across input terminals to absorb induced lightning energy before reaching precision op-amps. Use Value: 175 pF capacitance avoids signal distortion at loop bandwidths up to 10 kHz; 36 V VRWM matches typical loop supply headroom. |
| Medical Equipment ESD Interface | Telecom Line Card Surge Suppression |
Use Scenario: Guarding USB and button interfaces on portable diagnostic devices against hospital-grade ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS mounted directly at connector pins to shunt >16 kV HBM discharges. Use Value: Class 3 ESD rating and <1 ns response ensure no latch-up or reset of ARM-based host controller during clinical use. | Use Scenario: Front-end protection for Ethernet PHYs and DSL line drivers exposed to induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device on differential pairs, coordinated with GDT secondary protection. Use Value: 58.1 V clamping aligns with PHY absolute max ratings; 400 W rating handles multiple telecom surge standards including GR-1089. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA36CAT3G | Automotive-grade variant with AEC-Q101 certification, identical electrical specs and SMA package. | Required for automotive OEM BOMs mandating PPAP documentation and site-controlled manufacturing. | Select SZ1SMA36CAT3G when automotive qualification, change control, or traceability beyond commercial grade is required. |
| 1SMA36AT3G | Unidirectional version-same VRWM, VBR, VC, and PPK-but conducts only in reverse bias; anode grounded. | Suitable only for DC-biased rails where polarity is fixed and forward conduction must be blocked. | Choose 1SMA36AT3G for single-polarity power rails (e.g., +5 V logic supplies) where lower capacitance (175 pF vs. bidirectional's 175 pF) is not differentiating. |
Compared with 1SMA36CAT3, SZ1SMA36CAT3G adds automotive process controls and documentation without altering performance, while 1SMA36AT3G trades bidirectionality for unidirectional clamping-requiring circuit redesign if polarity reversal risk exists.
Availability
1SMA36CAT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and medical diagnostic equipment requiring stable component supply and long-term production continuity.
Supply support for 1SMA36CAT3 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 solutions for automotive, industrial, and cloud power applications.
The 1SMAxxCAT3G series belongs to ON Semiconductor's transient voltage suppressor portfolio, engineered specifically for high-reliability surge protection in harsh environments-including under-hood automotive, factory automation, and life-critical medical systems.
FAQ
What is the clamping voltage of the 1SMA36CAT3 under a standard 10/1000 µs surge?
The 1SMA36CAT3 has a maximum clamping voltage (VC) of 58.1 V when subjected to its rated peak pulse current of 6.9 A, defined by the 10/1000 µs waveform per R.E.A. standards. This value is measured at TJ = 25°C and represents the upper limit of voltage imposed on protected circuitry during surge events. Designers must verify that this clamping level remains below the absolute maximum ratings of downstream ICs. The 1SMA36CAT3 achieves this with low dynamic impedance and fast avalanche response.
Is the 1SMA36CAT3 suitable for automotive applications?
Yes, the 1SMA36CAT3 meets commercial-grade requirements, but for full automotive qualification, ON Semiconductor offers the SZ1SMA36CAT3G variant-AEC-Q101 qualified, PPAP-capable, and manufactured under automotive-specific process controls. While the 1SMA36CAT3 shares identical electrical parameters and the same SMA package, it lacks the formal automotive documentation and change control rigor. Use 1SMA36CAT3 in non-safety-critical automotive subsystems where cost sensitivity outweighs formal qualification needs.
How does the junction capacitance of the 1SMA36CAT3 affect high-speed signal lines?
The 1SMA36CAT3 exhibits a typical junction capacitance of 175 pF at 0 V bias, which may load high-frequency signals if placed directly on data lines exceeding ~1 MHz. For USB 2.0 or CAN FD interfaces, this capacitance can degrade edge rates or cause reflections. It is best applied on lower-bandwidth paths (e.g., 4–20 mA loops, RS-232, or power rails) or used in conjunction with series impedance to isolate capacitance. Always simulate or measure signal integrity when integrating the 1SMA36CAT3 into timing-critical traces.
What is the thermal derating behavior of the 1SMA36CAT3 above ambient temperature?
The 1SMA36CAT3 has a DC power dissipation rating of 0.5 W at TA = 25°C, derating linearly by 4.0 mW/°C above that temperature. At 75°C ambient, its DC rating drops to 0.3 W. For pulsed operation, peak power remains 400 W at TL = 25°C, but must be derated per Figure 3 in the datasheet-e.g., to ~70% at 100°C lead temperature. PCB layout using ON Semiconductor's recommended footprint (Case 403D) is essential to maintain thermal performance. The 1SMA36CAT3 relies on copper pad area and board thermal mass for heat dissipation.
Can the 1SMA36CAT3 replace a unidirectional TVS like the 1SMA36AT3G?
No-the 1SMA36CAT3 is bidirectional and conducts symmetrical clamping for both polarities, whereas the 1SMA36AT3G is unidirectional and blocks forward current. Substituting them without circuit review risks unintended conduction during normal operation (e.g., forward biasing in DC rails). If polarity is strictly controlled and reverse transients dominate, the 1SMA36AT3G may offer slightly better leakage or capacitance trade-offs-but the 1SMA36CAT3 must remain the choice for AC-coupled, floating, or bidirectional signal paths. Always validate with schematic-level analysis before replacement.
1SMA36CAT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 175pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA36CAT3 FAQ
1.How can I place an order for 1SMA36CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA36CAT3 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 1SMA36CAT3 reliable?
The price and inventory of 1SMA36CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA36CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMA36CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA36CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA36CAT3?
1SMA36CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA36CAT3 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 1SMA36CAT3?
For technical support, including 1SMA36CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA36CAT3 requirements.
6.How does Aetrix verify that 1SMA36CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA36CAT3 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 1SMA36CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMA36CAT3?
All 1SMA36CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA36CAT3, 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 1SMA36CAT3 part is unused and in its original packaging.
Return procedure for 1SMA36CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA36CAT3 Tags
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