My Inquiry
My Account
onsemi 1SMB54AT3
- Part No.:
- 1SMB54AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB54AT3.pdf
- Description:
- TVS DIODE 54VWM 87.1VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,272
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMB54AT3 from ON Semiconductor is a unidirectional 600 W peak power TVS diode designed for transient overvoltage protection in DC power rails and signal lines. It features a 54 V working peak reverse voltage (VRWM), 63.15 V nominal breakdown voltage (VBR) at 1 mA, 87.1 V clamping voltage (VC) at 6.9 A peak pulse current (IPP), and sub-1 ns response time. It is used to safeguard automotive power supplies, industrial I/O interfaces, and telecom line cards against ESD and lightning-induced surges.
For engineers reviewing the 1SMB54AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 6.9 A surge, UL 497B certification for isolated loop protection, low leakage (<5 µA @ 54 V), and SMB package compatibility with high-density SMT layouts.
Technical Context
The 1SMB54AT3 operates as a unidirectional Zener-based transient voltage suppressor, leveraging avalanche breakdown to clamp transients above its VRWM. Its design centers on fast turn-on (typically <1.0 ns), low dynamic impedance during clamping, and robust 600 W (10/1000 µs waveform) surge handling without degradation.
It is rated for continuous operation from −65 °C to +150 °C, with thermal resistance from junction-to-lead of 40 °C/W and junction-to-ambient of 226 °C/W. The device meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection - a requirement in industrial and telecom safety-critical interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 54 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system voltage margin for reliable protection. |
| VBR (min/typ/max) | 60.0 / 63.15 / 66.3 V @ 1 mA - Confirmed avalanche onset range; ensures predictable triggering across temperature and unit variation. |
| VC @ IPP | 87.1 V @ 6.9 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress imposed on downstream circuitry. |
| PPK | 600 W @ 1 ms - Peak transient energy absorption capability; validates suitability for IEC 61000-4-5 Level 4 surges. |
| IR @ VRWM | <5.0 µA - Low leakage preserves efficiency in high-impedance bias networks and battery-powered standby circuits. |
| Response Time | <1.0 ns - Enables suppression before sensitive logic or analog stages experience damaging overvoltage. |
| Capacitance (Ctyp) | 330 pF @ 0 V - Limits high-frequency signal distortion; suitable for DC/low-speed data lines but not RF or USB 2.0+. |
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 | Current entry terminal during forward conduction; tied to lower-potential side of protected node. | Connects to ground or return path in unidirectional configuration; enables low VF (≤3.5 V @ 30 A) during fault conditions. |
| Cathode | Current exit terminal during reverse-biased clamping; marked by polarity band. | Connects to protected line (e.g., 48 V rail); determines directionality - blocks normal operation, conducts only during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection - satisfies safety requirements in industrial controllers and telecom interface modules. |
| ESD Rating >16 kV (HBM) | Withstands human-body-model discharges without parametric shift or failure - critical for field-serviceable equipment ports. |
| 600 W Peak Power (10/1000 µs) | Handles severe lightning-induced surges per IEC 61000-4-5; supports designs targeting EN 61000-4-4/5 compliance. |
| Low Clamping Ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot relative to breakdown threshold - reduces stress on downstream MOSFETs, regulators, and ADC inputs. |
| Pb-Free (G suffix) & RoHS Compliant | Meets global environmental regulations; compatible with lead-free reflow profiles up to 260 °C for 10 s. |
Applications
| Automotive Power Distribution | Industrial PLC Digital I/O |
|---|---|
|
Use Scenario: Protection of 48 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp spikes up to ±100 V. Use Value: Maintains 87.1 V clamping ceiling at 6.9 A, preventing damage to 60 V-rated DC-DC converters and CAN transceivers. |
Use Scenario: Guarding 24 V digital input channels in programmable logic controllers against field-wiring surges. IC Role / Device Role / Timing Role: Standoff protector on dry-contact inputs; activated only during >54 V transients. Use Value: Sub-1 ns response ensures clamping occurs before microcontroller GPIO latch-up thresholds are exceeded. |
| Telecom Line Interface | Medical Equipment Power Entry |
|
Use Scenario: Surge protection on -48 V DC feed lines in base station remote radio units. IC Role / Device Role / Timing Role: Primary overvoltage clamp on centralized power bus feeding multiple RF modules. Use Value: UL 497B recognition confirms suitability for safety-isolated telecom infrastructure; 330 pF capacitance avoids signal integrity issues on DC bias lines. |
Use Scenario: Input-stage protection for AC/DC power supplies in diagnostic imaging systems. IC Role / Device Role / Timing Role: Secondary transient suppressor after MOVs, absorbing residual energy from fast-rising EFT bursts. Use Value: 600 W rating and 150 °C max junction temperature support reliability in thermally constrained medical enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ54A | Same VRWM (54 V), identical SMB package, but 600 W rating per JEDEC standards; slightly higher VC (89.0 V @ 6.7 A). | Approved for MIL-STD-883 Class B testing; preferred in defense/aerospace where qualification traceability is mandated. | Select SMBJ54A when full MIL-STD-883 screening or extended temperature validation is required beyond commercial-grade 1SMB54AT3. |
| 1.5SMC54A | Higher power rating (1500 W), DO-214AB package (larger footprint), same 54 V VRWM and comparable VC (87.1 V @ 17.3 A). | Used where higher single-pulse energy absorption is needed - e.g., primary protection before secondary 1SMB54AT3 stage. | Choose 1.5SMC54A as upstream coarse protection; retain 1SMB54AT3 as fine-clamp stage for precision voltage limiting. |
Compared with SMBJ54A and 1.5SMC54A, the 1SMB54AT3 offers optimal balance of compact SMB footprint, UL 497B certification, and cost-effective 600 W protection - making it ideal for space-constrained industrial and telecom end-equipment where regulatory compliance and layout density are prioritized.
Availability
1SMB54AT3 is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, and telecom line interface applications requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for 1SMB54AT3 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1SMB54AT3 belongs to the SMB series of unidirectional TVS diodes engineered for high-reliability transient suppression in harsh environments - with emphasis on UL recognition, surge robustness, and manufacturability in high-volume SMT assembly.
FAQ
What is the maximum clamping voltage of the 1SMB54AT3 under standard surge conditions?
The 1SMB54AT3 exhibits a maximum clamping voltage (VC) of 87.1 V when subjected to its rated peak pulse current of 6.9 A using the 10/1000 µs waveform. This value is measured per the test conditions specified in the ON Semiconductor datasheet and represents the upper bound of voltage seen by protected circuitry during a worst-case transient event. Designers must ensure downstream components tolerate this clamped level.
Is the 1SMB54AT3 suitable for bidirectional signal line protection?
No, the 1SMB54AT3 is explicitly a unidirectional TVS diode, intended for DC power rail or single-polarity signal protection. Its electrical characteristics - including VRWM, VBR, and clamping behavior - are defined only for reverse-bias operation. For bidirectional protection (e.g., RS-485, USB D+/D−), a dedicated bidirectional part such as 1SMB54AT3's counterpart 1SMB54CAT3 must be used instead.
Does the 1SMB54AT3 meet UL 497B requirements for isolated loop protection?
Yes, the entire 1SMB5.0AT3 series, including the 1SMB54AT3, carries UL 497B recognition under File #E210057 for protectors (QVGQ2 category). This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - confirming its fitness for use in safety-isolated industrial and telecom loop circuits.
What is the thermal resistance and maximum operating temperature of the 1SMB54AT3?
The 1SMB54AT3 has a junction-to-lead thermal resistance (RJL) of 40 °C/W and junction-to-ambient resistance (RJA) of 226 °C/W under standard FR-4 board conditions. Its operating and storage temperature range is −65 °C to +150 °C, enabling deployment in under-hood automotive, factory-floor industrial, and outdoor telecom environments without derating concerns below 75 °C ambient.
How does the 1SMB54AT3 compare to the 1SMB51AT3 and 1SMB58AT3 in terms of voltage ratings?
The 1SMB54AT3 sits between the 1SMB51AT3 (51 V VRWM) and 1SMB58AT3 (58 V VRWM) in the same SMB series. Its 54 V VRWM provides tighter matching to common 48 V nominal systems than either neighbor, while maintaining consistent 600 W surge capability and SMB package compatibility. All three share identical thermal, mechanical, and reliability specs - differing only in Zener voltage grading.
1SMB54AT3 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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 330pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB54AT3 FAQ
1.How can I place an order for 1SMB54AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB54AT3 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 1SMB54AT3 reliable?
The price and inventory of 1SMB54AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB54AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB54AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB54AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB54AT3?
1SMB54AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB54AT3 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 1SMB54AT3?
For technical support, including 1SMB54AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB54AT3 requirements.
6.How does Aetrix verify that 1SMB54AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB54AT3 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 1SMB54AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB54AT3?
All 1SMB54AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB54AT3, 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 1SMB54AT3 part is unused and in its original packaging.
Return procedure for 1SMB54AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB54AT3 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…
