My Inquiry
My Account
onsemi 1SMB90AT3
- Part No.:
- 1SMB90AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB90AT3.pdf
- Description:
- TVS DIODE 90VWM 146VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,823
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMB90AT3 from ON Semiconductor is a unidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 90 V working peak reverse voltage (VRWM), 146 V maximum clamping voltage (VC) at 39.0 A peak pulse current (IPP), and sub-1 ns response time - deployed in power supplies, industrial controls, and automotive ECUs to absorb ESD and lightning-induced surges.
For engineers reviewing the 1SMB90AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 1 ms 10/1000 µs transients, UL 497B certification for isolated loop protection, low leakage (<5 µA @ 90 V), and SMB package compatibility with high-density SMT layouts.
Technical Context
The 1SMB90AT3 operates as a Zener-based avalanche diode, triggered when reverse voltage exceeds its 94.4–104 V breakdown range (VBR @ IT = 1 mA). Its clamping action limits transient energy to ≤146 V at 39.0 A, enabling robust protection without upstream current limiting beyond standard PCB trace inductance.
Thermal design relies on junction-to-lead resistance (RJL = 40 °C/W) and 75°C derated power (3.0 W), while its 220 pF typical junction capacitance at 0 V bias ensures minimal signal distortion in DC/low-frequency power rails - not suitable for high-speed data lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 90 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's peak DC or AC voltage. |
| VBR (min/typ/max) | 94.4 / 100 / 104 V @ 1 mA - Confirmed avalanche onset range; determines minimum overvoltage threshold. |
| VC @ IPP | 146 V @ 39.0 A - Clamped voltage during 1 ms 10/1000 µs surge; defines worst-case stress on protected load. |
| PPK | 600 W - Peak transient power dissipation capability; validates single-event surge handling per IEC 61000-4-5 Level 4. |
| IR @ VRWM | 5.0 µA - Reverse leakage at rated working voltage; ensures negligible standby power loss in high-impedance circuits. |
| Response Time | <1.0 ns - Time from transient onset to conduction; enables suppression before downstream ICs experience overstress. |
| Junction Capacitance | 220 pF @ 0 V - Low enough for power rail use; avoids resonance or filtering issues below ~1 MHz. |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with modified L-bend leads, cathode indicated by polarity band. Dimensions: 4.32 mm × 2.13 mm × 2.26 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to system ground or low-impedance return plane; carries full surge current back to source. |
| Cathode | Protected line connection point | Connected to the voltage rail being safeguarded (e.g., +12 V input); clamps to anode when overvoltage occurs. |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection - meets strike voltage, endurance, and dielectric withstand requirements for telecom and industrial interfaces. |
| ESD Rating | Class 3 (>16 kV HBM) - survives direct human-body model discharges without parameter shift or failure. |
| Surmetic® Package | Void-free thermoset molding with corrosion-resistant finish - ensures long-term reliability under thermal cycling and humid environments. |
| Lead Solderability | Rated for 260°C / 10 s reflow - compatible with standard lead-free PCB assembly processes without delamination or voiding. |
| Pb-Free Option | G-suffix variant available - complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +24 V rail and chassis ground to clamp transients up to 100 V peak. Use Value: Limits voltage excursion to ≤146 V during 39 A surge, preventing damage to upstream DC/DC controllers and downstream microcontrollers. |
Use Scenario: 12 V battery feed to BCM MCU and CAN transceiver in passenger vehicle cabin network. IC Role / Device Role / Timing Role: Parallel-connected surge suppressor on main power entry, activated within <1 ns of overvoltage event. Use Value: Absorbs 600 W peak energy from load dump (ISO 16750-2) without degradation, maintaining system uptime and meeting OEM EMC requirements. |
| Medical Equipment AC/DC Adapter Output | Point-of-Sale Terminal DC Input Stage |
Use Scenario: Secondary-side 5 V/12 V output of Class II medical-grade AC/DC adapter powering patient monitoring sensors. IC Role / Device Role / Timing Role: Final-stage overvoltage guard before low-voltage regulators and analog front-ends. Use Value: Provides UL 497B-certified isolation barrier protection, ensuring compliance with IEC 60601-1 creepage/clearance and surge immunity mandates. |
Use Scenario: 12 V DC input of retail POS terminal subjected to ESD events from operator contact and cable coupling. IC Role / Device Role / Timing Role: First-line defense against ±15 kV contact ESD (IEC 61000-4-2) on external power connector. Use Value: Clamps ESD-induced spikes to safe levels within nanoseconds, eliminating reset faults and flash memory corruption in embedded Linux systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A | Same VRWM (90 V) and VC (146 V), but lower PPK (600 W vs. 600 W identical), higher IR (10 µA vs. 5 µA), different marking and packaging (tape/reel count differs). | Identical clamping performance; validated in same automotive and industrial reference designs. | Select SMBJ90A if sourcing from alternate distributor channels where 1SMB90AT3G allocation is constrained. |
| 1.5SMC90A | Higher PPK (1500 W), larger SMC package (7.1 mm × 6.2 mm), 10× higher junction capacitance (1200 pF), same VRWM and VBR range. | Not suitable for space-constrained boards; better for high-energy surges where layout allows larger footprint and added capacitance is acceptable. | Choose 1.5SMC90A only when surge threat exceeds 600 W or board area permits SMC package; avoid in high-frequency or miniaturized designs. |
Compared with SMBJ90A and 1.5SMC90A, the 1SMB90AT3 delivers optimal balance of compact SMB footprint, low 220 pF capacitance, and certified 600 W surge handling - making it preferred for dense industrial and automotive control modules where size, speed, and regulatory compliance are jointly critical.
Availability
1SMB90AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and medical device power conversion requiring stable component supply and UL 497B-compliant surge protection.
Supply support for 1SMB90AT3 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 energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMB90AT3 belongs to the SMB series of unidirectional TVS diodes engineered specifically for cost-sensitive, high-reliability DC power rail protection - emphasizing fast response, low clamping, and UL recognition in compact SMT packages.
FAQ
What is the clamping voltage of the 1SMB90AT3 under a standard 1 ms transient?
The 1SMB90AT3 exhibits a maximum clamping voltage (VC) of 146 V when subjected to its rated peak pulse current of 39.0 A under a 1 ms 10/1000 µs waveform. This value is measured per Figure 2 in the official datasheet and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within absolute maximum ratings.
Does the 1SMB90AT3 meet UL 497B certification requirements?
Yes, the 1SMB90AT3 is UL Recognized under file E210057 for protector classification QVGQ2 per UL 497B. It has passed all required tests including strike voltage breakdown, endurance conditioning, temperature cycling, dielectric withstand, and discharge verification - confirming suitability for isolated loop protection in telecom, industrial, and medical applications where regulatory compliance is mandatory.
What is the maximum reverse leakage current for the 1SMB90AT3 at its working voltage?
The 1SMB90AT3 specifies a maximum reverse leakage current (IR) of 5.0 µA when biased at its working peak reverse voltage (VRWM) of 90 V. This low leakage ensures minimal power loss and thermal impact in always-on systems such as automotive ECUs or medical monitors, supporting long-term reliability without affecting upstream voltage regulation stability.
Can the 1SMB90AT3 be used in bidirectional signal line protection?
No, the 1SMB90AT3 is a unidirectional TVS diode and is not suitable for bidirectional signal line protection. Its asymmetrical construction clamps only in reverse bias; forward conduction follows standard silicon diode behavior (~0.85 V VF @ 30 A). For AC or differential signal lines like RS-485 or USB, a dedicated bidirectional part such as 1SMB90AT3's counterpart 1SMB90CAT3 must be selected instead.
What is the thermal resistance from junction to ambient for the 1SMB90AT3 in standard FR-4 layout?
The 1SMB90AT3 has a thermal resistance from junction to ambient (RJA) of 226 °C/W when mounted on an FR-4 board using ON Semiconductor's minimum recommended footprint (Case 403A outline). This value assumes no copper pour; adding thermal relief pads or internal ground planes reduces RJA significantly - essential for sustained surge duty cycles or elevated ambient temperatures above 25°C.
1SMB90AT3 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):
- 90V
- Voltage - Breakdown (Min):
- 100V
- Voltage - Clamping (Max) @ Ipp:
- 146V
- Current - Peak Pulse (10/1000µs):
- 4.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 210pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB90AT3 FAQ
1.How can I place an order for 1SMB90AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB90AT3 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 1SMB90AT3 reliable?
The price and inventory of 1SMB90AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB90AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB90AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB90AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB90AT3?
1SMB90AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB90AT3 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 1SMB90AT3?
For technical support, including 1SMB90AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB90AT3 requirements.
6.How does Aetrix verify that 1SMB90AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB90AT3 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 1SMB90AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB90AT3?
All 1SMB90AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB90AT3, 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 1SMB90AT3 part is unused and in its original packaging.
Return procedure for 1SMB90AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB90AT3 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
