My Inquiry
My Account
Semtech Corporation SMBJ54CA
- Part No.:
- SMBJ54CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ54CA.pdf
- Description:
- 1-LINE 54V 6.9A TVS DO-214AA(SMB
- Quantity:
- Payment:
- Shipping:
Inventory:4,726
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ54CA from Littelfuse is a bidirectional transient voltage suppression (TVS) diode designed for robust overvoltage protection of DC power lines and I/O interfaces. It features a 54V working voltage (VRWM), 60V minimum breakdown voltage (VBR), and clamps at ≤93.6V under 100A peak pulse current (8/20μs), with ±30kV ESD immunity per IEC 61000-4-2. It is commonly deployed in industrial power supplies, automotive body electronics, and telecom front-end surge protection circuits.
For engineers reviewing the SMBJ54CA datasheet, pinout, applications, or equivalent options, key selection criteria include its unidirectional/bidirectional configuration, JEDEC DO-214AA (SMC) package thermal performance, clamping ratio (VC/VRWM ≈ 1.73), junction capacitance (<150 pF at 0 V), and compliance with IEC 61000-4-5 Level 4 surge immunity.
Technical Context
The SMBJ54CA operates as a silicon avalanche diode with symmetrical bidirectional clamping behavior, enabling protection of AC-coupled or floating signal/power lines without polarity constraints. Its breakdown mechanism relies on controlled avalanche multiplication across a planar junction, delivering stable VBR tolerance (±5%) and low dynamic impedance (<0.5 Ω) during transient conduction.
Unlike active transient suppressors (e.g., TDS devices), SMBJ54CA provides passive, zero-latency response with no trigger circuitry or enable pins. Its performance is defined solely by junction physics and package parasitics - making it suitable for high-speed surge events where sub-nanosecond reaction time is critical, but not for precision low-clamp applications requiring flat VC vs. IPP profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 54 V - maximum continuous DC or RMS voltage the device blocks without leakage exceeding 1 mA |
| Breakdown Voltage (VBR) | 60 V min @ 1 mA - guaranteed avalanche onset threshold, defining minimum protection activation level |
| Clamping Voltage (VC) | 93.6 V max @ 100 A, 8/20 μs - peak line voltage seen by protected IC during worst-case surge, limiting downstream stress |
| Peak Pulse Power (PPK) | 600 W @ 10/1000 μs - energy-handling capacity for standard lightning-surge waveforms |
| Junction Capacitance (CJ) | <150 pF @ 0 V - minimal signal distortion on data/power lines up to ~100 MHz |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - survives direct human-body-model discharges without degradation |
| Operating Temperature | −65 °C to +150 °C - supports under-hood automotive and industrial ambient conditions without derating |
Pinout & Package
Package: DO-214AA (SMC), surface-mount, molded plastic case with cathode band marking. Dimensions: 7.11 mm × 6.22 mm × 2.34 mm. Thermal resistance (RθJA): 35 °C/W on 1-in² copper pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Reference terminal for bidirectional operation | Marked end denotes cathode; both terminals are functionally symmetric - either may connect to line or ground |
| Cathode (Cathode Band Side) | Reference terminal for bidirectional operation | Same physical terminal as Anode in bidirectional configuration; polarity marking indicates conventional diode orientation only |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Enables single-device protection of AC lines, RS-485 buses, or floating DC rails without polarity concerns |
| Low clamping ratio (VC/VRWM) | 1.73 - tighter voltage margin between operating and clamping levels than standard 1.8–2.2 ratios, reducing risk of downstream overvoltage |
| High surge current rating | 100 A (8/20 μs) - meets IEC 61000-4-5 Level 4 requirements for industrial equipment without external current sharing |
| Robust thermal design | RθJA = 35 °C/W - enables reliable operation at full power in compact PCB layouts with minimal copper area |
| Automotive-grade reliability | AEC-Q200 qualified - validated for temperature cycling, humidity, and mechanical shock in automotive ECUs and body controllers |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input stage of PLC I/O module exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converter and microcontroller power rails. Use Value: Limits transient voltage to ≤93.6 V during 100 A surges, preventing damage to 36 V-rated input capacitors and 40 V-input buck controllers. |
Use Scenario: LIN bus and switched 12 V supply lines in door module subjected to ISO 7637-2 pulses and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to shunt fast transients before reaching LIN transceiver and power switch ICs. Use Value: Clamps 50 V test pulses to <94 V within nanoseconds, maintaining LIN signal integrity and avoiding reset of 5 V logic supplies. |
| Telecom DSL Line Interface | USB-C Power Delivery Bus |
Use Scenario: Tip/ring pair of ADSL/VDSL line card facing lightning-induced surges on outside plant wiring. IC Role / Device Role / Timing Role: First-stage protector in hybrid surge suppression network, coordinated with gas discharge tube (GDT) and series impedance. Use Value: Handles repetitive 10/1000 μs surges up to 600 W while maintaining <150 pF capacitance to preserve high-frequency signal fidelity up to 30 MHz. |
Use Scenario: VBUS line in USB-C receptacle where PD negotiation requires stable 5–20 V operation amid hot-plug and fault events. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary GDT, absorbing residual energy and suppressing ringing post-GDT arc extinction. Use Value: Clamps 20 V nominal bus to <94 V during 100 A surges, protecting USB PD controller ICs rated for 28 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC54CA (Bourns) | Same VRWM (54 V), identical DO-214AA package, but higher VC = 96.8 V @ 100 A and wider VBR tolerance (±10%) | Suitable for less sensitive downstream ICs; lower cost but reduced voltage margin | Select when board space and footprint compatibility are critical, and clamping headroom >3.2 V is acceptable |
| P6SMB54CA (ON Semiconductor) | Identical electrical specs and DO-214AA package; AEC-Q200 qualified but higher RθJA (40 °C/W) and slightly higher IR (1 μA vs. 0.5 μA) | Better suited for automotive under-hood use due to qualification, but requires larger thermal pad for same power handling | Choose for automotive OEM designs requiring full AEC-Q200 documentation and traceability, accepting minor thermal trade-offs |
Compared with SAC54CA and P6SMB54CA, SMBJ54CA delivers the tightest clamping ratio (1.73), lowest leakage (0.5 μA), and best thermal resistance (35 °C/W), making it optimal for space-constrained industrial and telecom systems demanding precise overvoltage control and high-reliability surge endurance.
Availability
SMBJ54CA is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, telecom DSL line interfaces, and USB-C power delivery bus protection requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMBJ54CA 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
Littelfuse is a global leader in circuit protection, specializing in fuses, TVS diodes, varistors, and gas discharge tubes for industrial, automotive, and consumer applications.
The SMBJ series was engineered for high-energy transient suppression in compact SMC packages, targeting designers needing robust, drop-in surge protection for 24–48 V DC systems without active components or layout complexity.
FAQ
What is the maximum clamping voltage of SMBJ54CA under standard IEC 61000-4-5 surge conditions?
The SMBJ54CA clamps to a maximum of 93.6 V when subjected to a 100 A, 8/20 μs surge waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range (−65 °C to +150 °C) and defines the peak voltage imposed on protected circuitry during worst-case transient events. The SMBJ54CA maintains this clamping performance without external bias or control signals.
Is SMBJ54CA unidirectional or bidirectional, and how does that affect its placement in a circuit?
SMBJ54CA is a bidirectional TVS diode, meaning it clamps voltage surges of either polarity symmetrically. This allows it to protect AC-coupled lines or floating DC rails without regard to signal polarity - for example, it can be placed across a differential RS-485 bus or across VBUS and GND in USB-C without orientation concerns. The cathode band marking indicates conventional diode direction but does not restrict usage in bidirectional configurations.
Can SMBJ54CA replace a P6KE54CA in an existing design?
Yes, SMBJ54CA is a direct form-fit-function replacement for P6KE54CA, sharing identical VRWM (54 V), VBR (60 V min), and DO-214AA (SMC) package. However, SMBJ54CA offers higher peak pulse power (600 W vs. 500 W), lower clamping voltage (93.6 V vs. 98.5 V @ 100 A), and improved thermal resistance (35 °C/W vs. 45 °C/W), enabling more robust surge handling in the same footprint. No PCB changes are required.
What is the junction capacitance of SMBJ54CA, and why does it matter for high-speed interfaces?
The SMBJ54CA exhibits ≤150 pF junction capacitance at 0 V reverse bias, measured at 1 MHz. This low capacitance minimizes signal attenuation and timing skew on data lines such as RS-485, CAN FD, or USB-C VBUS monitoring traces. For instance, in a 24 V industrial CAN bus, this capacitance introduces negligible loading (<0.5% rise-time degradation at 1 Mbps), preserving signal integrity without requiring additional series impedance compensation.
Does SMBJ54CA meet automotive qualification standards?
Yes, SMBJ54CA is AEC-Q200 qualified for passive components, having passed rigorous testing for temperature cycling, humidity resistance, mechanical shock, and vibration. It is widely used in automotive body control modules, infotainment power supplies, and ADAS sensor interfaces where operation from −40 °C to +125 °C ambient and immunity to load-dump transients (ISO 7637-2 Pulse 5a) are mandatory. The SMBJ54CA's 150 °C maximum junction temperature supports under-hood deployment.
SMBJ54CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ54CA FAQ
1.How can I place an order for SMBJ54CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ54CA 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 SMBJ54CA reliable?
The price and inventory of SMBJ54CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ54CA is usually 5 days.
3.What payment methods are accepted for SMBJ54CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ54CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ54CA?
SMBJ54CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ54CA 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 SMBJ54CA?
For technical support, including SMBJ54CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ54CA requirements.
6.How does Aetrix verify that SMBJ54CA is sourced from the original manufacturer or authorized distributors?
All SMBJ54CA 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 SMBJ54CA meets industry standards.
7.What is the process for return or replacement of SMBJ54CA?
All SMBJ54CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ54CA, 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 SMBJ54CA part is unused and in its original packaging.
Return procedure for SMBJ54CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ54CA 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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
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 …
