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onsemi 1SMB36AT3
- Part No.:
- 1SMB36AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMB36AT3.pdf
- Description:
- TVS DIODE 36V 58.1V SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,450
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Product details
Overview
1SMB36AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for parallel overvoltage protection of sensitive electronics. It features a 36 V working peak reverse voltage (VRWM), clamps at 58.1 V @ 10.3 A peak pulse current (IPP), and delivers sub-1 ns response time with <5 µA leakage @ VRWM. It is widely deployed in industrial power supplies and automotive ECUs to absorb lightning-induced surges and ESD events.
For engineers reviewing the 1SMB36AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system rail, surge current handling under 1 ms 10/1000 µs waveform, UL 497B recognition for isolated loop protection, and SMB package thermal performance in high-density PCB layouts.
Technical Context
The 1SMB36AT3 operates as a silicon avalanche diode configured in unidirectional mode, leveraging Zener breakdown physics to clamp transients above its specified VRWM. Its junction design achieves low dynamic impedance during surge conduction, enabling stable clamping across varying IPP levels up to 10.3 A.
It complies with AEC-Q101 for automotive use and meets UL 497B Class 3 ESD rating (>16 kV HBM). The device is optimized for single-pulse, non-repetitive surge suppression - not continuous regulation - and requires external series impedance (e.g., fuse or resistor) to limit fault current during clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Power Dissipation | 600 W @ 1 ms 10/1000 µs pulse - defines maximum single-event energy absorption capability |
| Working Peak Reverse Voltage (VRWM) | 36 V - maximum continuous DC or peak AC voltage the device blocks without clamping |
| Clamping Voltage (VC) | 58.1 V @ IPP = 10.3 A - maximum voltage seen by protected circuit during rated surge |
| Breakdown Voltage (VBR) | 40.0–44.2 V @ IT = 1.0 mA - ensures reliable turn-on before VC is reached |
| Leakage Current (IR) | <5.0 µA @ 36 V - negligible standby power loss and signal integrity impact |
| Response Time | <1.0 ns - enables suppression of fast-rising transients before downstream ICs are damaged |
| Junction Capacitance | 470 pF @ 0 V - relevant for high-frequency signal line protection; impacts bandwidth trade-off |
Pinout & Package
1SMB36AT3 is housed in an SMB (DO-214AA) surface-mount plastic package (Case 403A), featuring a cathode-indicated polarity band and modified L-bend leads for enhanced solder joint reliability. Maximum soldering temperature is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during clamping | Connected to ground or low-impedance return path; carries full surge current during transient |
| Cathode | Protected circuit node connection | Connected to the line being protected (e.g., +12 V rail); voltage referenced to Anode during clamping |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGQ2) | Validated for isolated loop circuit protection - eliminates need for separate safety certification in telecom/power interface designs |
| AEC-Q101 Qualified | Qualified for automotive underhood applications including engine control modules and body electronics |
| 600 W Peak Pulse Power | Withstands IEC 61000-4-5 Level 4 (4 kV) surge events when properly implemented with series impedance |
| ESD Rating >16 kV (HBM) | Protects against human-body-model electrostatic discharge without requiring additional ESD stages |
| SURMETIC™ Package | Void-free thermoset molding ensures long-term moisture resistance and thermal cycling reliability in industrial environments |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +24 V rail and chassis ground to clamp surges exceeding 36 V. Use Value: Limits transient voltage to ≤58.1 V, preventing damage to upstream rectifier and downstream DC/DC controller ICs during 600 W surge events. |
Use Scenario: CAN_H line in automotive BCM subjected to ISO 7637-2 pulse 5a (load dump) and ESD events per ISO 10605. IC Role / Device Role / Timing Role: Standoff TVS on differential CAN bus pair, with cathode tied to CAN_H and anode to ground. Use Value: Clamps CAN_H to ≤58.1 V during 10.3 A surge, preserving signal integrity and ensuring CAN transceiver survival without bus shutdown. |
| Medical Equipment AC/DC Adapter Surge Suppression | Telecom DSL Line Interface Protection |
Use Scenario: Secondary-side 12 V output of medical-grade AC/DC adapter connected to patient-monitoring sensor board. IC Role / Device Role / Timing Role: Final-stage TVS on low-voltage DC output to suppress coupling from primary-side transients or ESD injection. Use Value: Provides UL 497B-recognized isolation barrier protection, meeting IEC 60601-1 creepage/clearance and surge immunity requirements. |
Use Scenario: Tip/ring lines of ADSL/VDSL modem interface exposed to lightning-induced surges on outside plant wiring. IC Role / Device Role / Timing Role: Primary protection device on each copper pair, mounted adjacent to RJ-11 connector with minimal trace length. Use Value: Achieves <1 ns response and 58.1 V clamping to prevent damage to line driver/receiver ICs while maintaining <470 pF capacitance for broadband signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMB36AT3G | Pb-free variant with identical electrical specs; AEC-Q101 qualified with PPAP support | Required for automotive production programs mandating RoHS-compliant, automotive-qualified components | Select SZ1SMB36AT3G when automotive qualification documentation (PPAP, control plan) is contractually required |
| 1.5SMC36A | Same VRWM and VC, but SMC package (larger footprint, higher thermal mass, 1500 W rating) | Better suited for higher-energy surges or elevated ambient temperatures where SMB thermal limits are exceeded | Choose 1.5SMC36A only if system-level testing confirms need for >600 W single-pulse rating or improved thermal derating above 75°C |
Compared with SZ1SMB36AT3G, the 1SMB36AT3 lacks formal PPAP documentation but shares identical electrical behavior and SMB packaging; compared with 1.5SMC36A, it offers space savings and lower parasitic capacitance at the cost of reduced surge energy headroom and thermal margin.
Availability
1SMB36AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, and medical equipment requiring stable component supply with consistent SMB package form factor and UL 497B compliance.
Supply support for 1SMB36AT3 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 (now onsemi) is a global semiconductor supplier specializing in power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud power applications.
The SMB-series TVS diodes, including 1SMB36AT3, were developed to deliver high-surge robustness in compact surface-mount packages for cost-sensitive, high-volume systems requiring certified overvoltage protection.
FAQ
What is the clamping voltage of the 1SMB36AT3 under maximum rated surge current?
The 1SMB36AT3 clamps to a maximum of 58.1 V when subjected to its rated peak pulse current of 10.3 A, measured using the standard 10/1000 µs double-exponential waveform. This value is guaranteed across temperature and represents the highest voltage the protected circuit will experience during a full-rated surge event. Designers must ensure this clamping level remains below the absolute maximum voltage rating of downstream components. The 1SMB36AT3 achieves this performance through controlled avalanche breakdown in its silicon junction.
Is the 1SMB36AT3 suitable for bidirectional signal line protection?
No, the 1SMB36AT3 is strictly unidirectional and must not be used on AC-coupled or bidirectional data lines such as USB, RS-485, or Ethernet without external circuitry. Its cathode-anode polarity is fixed, and reverse conduction beyond VRWM triggers clamping only in one direction. For bidirectional protection, ON Semiconductor offers the 1SMB36CAT3 variant (not the 1SMB36AT3), which has symmetrical breakdown in both polarities. Using the 1SMB36AT3 on a bidirectional line risks permanent failure during negative transients.
Does the 1SMB36AT3 require a series current-limiting element in circuit design?
Yes, the 1SMB36AT3 requires an external series impedance - typically a fuse, PTC, or resistor - placed between the protected line and the TVS cathode. This element limits steady-state fault current during sustained overvoltage conditions (e.g., AC mains misconnection), preventing thermal runaway and device destruction. The 1SMB36AT3 is rated for single-pulse surge dissipation only; it cannot safely handle continuous power dissipation above its 0.55 W ambient-rated limit. Proper coordination of this impedance is essential for reliable operation.
How does the 1SMB36AT3 differ from the SZ1SMB36AT3G variant?
The 1SMB36AT3 and SZ1SMB36AT3G share identical electrical specifications, SMB package dimensions, and surge performance. The key distinction is qualification: SZ1SMB36AT3G is explicitly AEC-Q101 qualified and PPAP-capable, with manufacturing traceability aligned to automotive quality systems, whereas the 1SMB36AT3 is intended for industrial and commercial applications. Both are Pb-free, but only the SZ-prefix part carries automotive change control and audit documentation required for Tier 1 automotive procurement.
Can the 1SMB36AT3 be used in place of a Zener diode for voltage regulation?
No, the 1SMB36AT3 is not designed for continuous voltage regulation. It is optimized for transient suppression - conducting heavily only during short-duration surges - and exhibits high dynamic impedance and significant leakage variance outside its narrow clamping region. Its 36 V VRWM is not a regulated output voltage; sustained DC bias at or near this level causes excessive power dissipation and thermal failure. For regulation, discrete Zener diodes (e.g., MMSZ4700) or dedicated voltage references should be used instead of the 1SMB36AT3.
1SMB36AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
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- Qualification:
- -
- Mounting Type:
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- Supplier Device Package:
- -
1SMB36AT3 FAQ
1.How can I place an order for 1SMB36AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB36AT3 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 1SMB36AT3 reliable?
The price and inventory of 1SMB36AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB36AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB36AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB36AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB36AT3?
1SMB36AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB36AT3 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 1SMB36AT3?
For technical support, including 1SMB36AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB36AT3 requirements.
6.How does Aetrix verify that 1SMB36AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB36AT3 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 1SMB36AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB36AT3?
All 1SMB36AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB36AT3, 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 1SMB36AT3 part is unused and in its original packaging.
Return procedure for 1SMB36AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB36AT3 Tags
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