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onsemi 1SMB100AT3
- Part No.:
- 1SMB100AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB100AT3.pdf
- Description:
- TVS DIODE 100VWM 162VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,926
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Product details
Overview
1SMB100AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for overvoltage protection in DC power rails and signal lines. It features a 100 V working peak reverse voltage (VRWM), 123 V maximum clamping voltage at 3.7 A peak pulse current (VC @ IPP), and sub-1 ns response time. It is used in industrial power supplies and automotive ECUs to clamp ESD and lightning-induced transients.
For engineers reviewing the 1SMB100AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to protected IC absolute maximum ratings, UL 497B certification for isolated loop compliance, and SMB package thermal performance under repetitive surge conditions.
Technical Context
The 1SMB100AT3 operates as a unidirectional Zener-based TVS diode, conducting only during negative transients on the anode side. Its breakdown voltage is specified at 111–123 V (VBR min/max @ IT = 1.0 A), with clamping established at 162 V (VC) under 3.7 A 10/1000 µs pulse.
It delivers 600 W peak pulse power per 1 ms waveform, with thermal derating to 0.55 W at TA = 25°C and junction-to-ambient thermal resistance of 226 °C/W. The device meets Class 3 HBM ESD rating (>16 kV) and UL 497B recognition for isolated loop circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 100 V - Maximum continuous reverse voltage before clamping begins; must exceed circuit's DC operating voltage. |
| VBR @ IT=1.0 A | 111–123 V - Zener breakdown range; defines turn-on threshold under standardized test current. |
| VC @ IPP=3.7 A | 162 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream components. |
| PPK | 600 W - Peak transient power handling capability; validated per non-repetitive 1 ms pulse per Figure 2. |
| IR @ VRWM | 5.0 µA max - Reverse leakage at rated working voltage; ensures minimal standby power loss. |
| Response Time | <1.0 ns - Time from transient onset to conduction; enables protection of fast-edge digital interfaces. |
| UL Recognition | UL 497B QVGQ2 - Certified for isolated loop telecom and industrial protection applications. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with modified L-bend leads and cathode polarity band. Dimensions: 4.32 mm × 2.13 mm × 2.26 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path | Connected to protected line; conducts surge current to ground when voltage exceeds VRWM. |
| Cathode | Reference/ground connection | Connected to system ground or low-impedance return; polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Withstands high-energy surges (e.g., ISO 7637-2 Pulse 1/2a/5a) without failure in automotive power inputs. |
| UL 497B certification | Validated for use in safety-critical isolated loop circuits including telecom interface protection. |
| ESD Class 3 (>16 kV HBM) | Provides robust board-level ESD immunity without requiring additional discrete ESD protection. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or damage to 120 V-tolerant ICs. |
| Pb-free (G suffix) and RoHS compliant | Enables direct use in lead-free reflow processes (260°C/10 s) without reliability degradation. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
Use Scenario: 24 V DC input rail exposed to load dump and jump-start transients in factory automation PSUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground to clamp positive-going surges above 100 V. Use Value: Limits transient voltage to ≤162 V, protecting downstream DC-DC controllers rated for 130 V absolute max. |
Use Scenario: CAN_H line in BCM subjected to ESD events and coupled noise from adjacent high-current solenoid drivers. IC Role / Device Role / Timing Role: Standoff TVS connected from CAN_H to chassis ground, absorbing fast transients before they reach transceiver. Use Value: Sub-1 ns response prevents >16 kV HBM ESD from damaging the CAN transceiver's I/O pins. |
| Medical Equipment AC/DC Adapter Output Protection | Telecom DSL Line Interface Surge Protection |
Use Scenario: Secondary-side 48 V output of medical-grade AC/DC adapter vulnerable to conducted surges from shared building wiring. IC Role / Device Role / Timing Role: Unidirectional TVS installed across output terminals to clamp overvoltage before it reaches patient-connected subsystems. Use Value: UL 497B certification validates safe operation in isolated secondary circuits required by IEC 60601-1. |
Use Scenario: DSL line card exposed to lightning-induced surges on twisted-pair copper lines entering building premises. IC Role / Device Role / Timing Role: Primary-stage TVS on line-side transformer secondary, shunting surge energy before isolation barrier. Use Value: 600 W peak power rating handles Telcordia GR-1089 Class B surge requirements without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ100A | Same VRWM (100 V) and VC (162 V), but lower PPK = 600 W (identical), different thermal RJA (226 vs 240 °C/W). | No UL 497B recognition; lacks isolated-loop certification. | Select 1SMB100AT3 where UL-compliant protection is mandated for telecom or medical secondary-side circuits. |
| 1.5SMC100A | Higher PPK = 1500 W, larger SMC package (7.11 × 6.22 mm), VRWM = 100 V, VC = 165 V @ 9.1 A. | Requires PCB area increase; suited for higher-energy surges where space permits. | Choose 1.5SMC100A only if system-level testing confirms need for >600 W surge handling and layout allows SMC footprint. |
Compared with SMBJ100A, 1SMB100AT3 provides UL 497B certification critical for regulated isolated systems; compared with 1.5SMC100A, it offers identical clamping performance in a 40% smaller SMB footprint-ideal for space-constrained industrial and automotive modules.
Availability
1SMB100AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control units, and medical equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1SMB100AT3 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 discrete devices for automotive, industrial, and cloud power applications.
The 1SMB100AT3 belongs to the SMB series of unidirectional Zener TVS diodes, engineered for high-surge, low-clamping protection in cost-sensitive, high-reliability power and interface circuits.
FAQ
What is the maximum clamping voltage of the 1SMB100AT3 under standard surge conditions?
The 1SMB100AT3 has a maximum clamping voltage (VC) of 162 V when subjected to its rated peak pulse current of 3.7 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and appears in the Electrical Characteristics table on page 3 of the official datasheet. The 1SMB100AT3 maintains this clamping performance across its qualified temperature range and is validated for non-repetitive surge events.
Does the 1SMB100AT3 meet UL safety standards for circuit protection?
Yes, the 1SMB100AT3 carries UL 497B recognition (File #E210057, category QVGQ2) for isolated loop circuit protection. It passed rigorous tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge validation-unlike many generic TVS diodes that only meet flammability requirements. This makes the 1SMB100AT3 suitable for certified medical and telecom applications where regulatory compliance is mandatory.
What is the thermal derating behavior of the 1SMB100AT3 above 25°C ambient temperature?
The 1SMB100AT3 has a thermal resistance of 226 °C/W (junction-to-ambient) and a DC power dissipation limit of 0.55 W at TA = 25°C, derating linearly at 4.4 mW/°C above that temperature. At 75°C ambient, its usable DC power drops to 0.33 W. For pulsed operation, Figure 3 in the datasheet shows peak power derating curves-critical for designs with frequent transient exposure in hot environments like engine compartments.
Can the 1SMB100AT3 be used in bidirectional signal line protection?
No-the 1SMB100AT3 is strictly unidirectional and conducts only when the anode is driven positive relative to the cathode. For bidirectional protection (e.g., RS-485, USB D+/D−), a symmetric device such as the 1SMB100AT3's bidirectional counterpart (e.g., 1SMB100CAT3) is required. Using the 1SMB100AT3 on AC or differential lines risks forward conduction during normal signal swings and potential latch-up or damage.
What is the reverse leakage current specification for the 1SMB100AT3 at its rated VRWM?
The 1SMB100AT3 specifies a maximum reverse leakage current (IR) of 5.0 µA at its working peak reverse voltage of 100 V and TA = 25°C. This low leakage ensures minimal quiescent power loss in always-on systems such as battery-backed industrial controllers or medical monitoring devices where standby current budget is tightly constrained.
1SMB100AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 162V
- Current - Peak Pulse (10/1000µs):
- 3.7A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 190pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB100AT3 FAQ
1.How can I place an order for 1SMB100AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB100AT3 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 1SMB100AT3 reliable?
The price and inventory of 1SMB100AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB100AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB100AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB100AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB100AT3?
1SMB100AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB100AT3 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 1SMB100AT3?
For technical support, including 1SMB100AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB100AT3 requirements.
6.How does Aetrix verify that 1SMB100AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB100AT3 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 1SMB100AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB100AT3?
All 1SMB100AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB100AT3, 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 1SMB100AT3 part is unused and in its original packaging.
Return procedure for 1SMB100AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB100AT3 Tags
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