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Taiwan Semiconductor Corporation SMBJ48C
- Part No.:
- SMBJ48C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48C.pdf
- Description:
- 600W, 59.3V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,150
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Product details
Overview
SMBJ48C from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 48 V working stand-off voltage (VWM), 53.3–65.1 V breakdown voltage (VBR @ 1 mA), and 85.5 V maximum clamping voltage (VC @ 7.3 A) under 10/1000 µs surge. It protects automotive power-line and industrial control inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ48C datasheet, SMBJ48C pinout, SMBJ48C application, or SMBJ48C equivalent, key selection criteria include its 7.3 A peak impulse current rating, <1 µA leakage at 48 V, 1.0 ps response time, RoHS/halogen-free compliance, and J-STD-020 Level 1 moisture sensitivity - critical for high-reliability automotive and industrial PCB assembly.
Technical Context
The SMBJ48C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (53.3–65.1 V), clamping transient energy within 1.0 ps to limit downstream circuit stress. Its glass-passivated junction ensures stable breakdown characteristics across -55°C to +150°C operating temperature.
Designed for 10/1000 µs waveform immunity per IEC 61000-4-5 and ISO 7637-2, it delivers 600 W non-repetitive peak pulse power with thermal resistance RθJA = 55 °C/W and RθJC = 10 °C/W, enabling direct PCB-level placement without heatsinking in moderate-power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC bias margin for protected line. |
| VBR @ IT = 1 mA | 53.3–65.1 V - Measured breakdown threshold; ensures reliable turn-on above system nominal voltage with margin. |
| VC @ IPP = 7.3 A | 85.5 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs or regulators. |
| IPP | 7.3 A - Peak surge current capability at rated clamping voltage; defines immunity level against defined transients. |
| ID @ VWM | <1 µA - Reverse leakage at 48 V; negligible power loss and signal integrity impact in standby or low-power modes. |
| PPK | 600 W - Non-repetitive peak pulse power handling; supports single-event automotive load-dump or inductive switch-off events. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, UL 94V-0 molding compound, 0.090 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input / Surge return path | Connected to ground or low-impedance return; completes clamping loop during transient event. |
| Cathode | Protected line connection | Connected to line being protected (e.g., 48 V supply rail); blocks normal operation, conducts only during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables clamping before sensitive logic or analog circuitry sustains damage from ESD or fast transients. |
| Glass passivated junction | Stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line disturbance) - essential for automotive ECUs. |
| J-STD-020 Level 1 moisture sensitivity | Zero bake requirement prior to reflow; compatible with standard SMT assembly lines without special handling. |
Applications
| Automotive Power Distribution | Industrial PLC Input Protection |
|---|---|
Use Scenario: 48 V battery-supplied ADAS camera module exposed to load-dump transients during alternator regulation failure. IC Role / Device Role: Primary clamping device on main 48 V input rail, placed upstream of DC-DC converter. Use Value: Limits transient voltage to ≤85.5 V, preventing damage to 65 V-rated buck controller and image sensor power domain. |
Use Scenario: 24–48 V digital input channel on programmable logic controller receiving signals from external sensors in factory automation. IC Role / Device Role: Line-side TVS on isolated input stage, protecting optocoupler driver and microcontroller GPIO. Use Value: Suppresses EFT bursts (IEC 61000-4-4) and inductive kickback from solenoid feedback, maintaining signal integrity below 1 µA leakage. |
| LED Streetlight Driver | Telecom Remote Power Feeding |
Use Scenario: Constant-current LED driver board powered via 48 V PoE-like midspan injector, subject to lightning-induced surges on outdoor cabling. IC Role / Device Role: First-stage transient suppressor at AC/DC rectifier output or DC bus entry point. Use Value: Absorbs 600 W single-event surge while maintaining <1 µA leakage at 48 V, avoiding false triggering or standby power waste. |
Use Scenario: Remote radio unit powered over 48 V DC feed line in distributed antenna system, vulnerable to induced surges from nearby lightning strikes. IC Role / Device Role: Bidirectional protection element (used as unidirectional with cathode to feed line) on DC input before DC-DC isolation stage. Use Value: Clamps 10/1000 µs surges to 85.5 V with 7.3 A capacity, preserving integrity of 100 V-rated front-end MOSFETs and monitoring ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ48A | Same DO-214AC (SMA) package; lower PPK = 400 W; VC = 77.4 V @ 6.5 A; slightly tighter VBR tolerance (53.3–58.9 V). | Lower surge rating limits use in high-energy automotive load-dump scenarios; better suited for consumer-grade 48 V systems with lower transient severity. | Select SMAJ48A only if system-level testing confirms 400 W suffices and space constraints favor smaller SMA footprint. |
| ON Semiconductor 1.5SMC47C | DO-214AB (SMC) package; higher PPK = 1500 W; VC = 77.0 V @ 19.5 A; larger thermal mass and footprint. | Over-specified for most 48 V board-level protection; requires larger PCB area and may not fit tight-layout automotive modules. | Choose 1.5SMC47C only when legacy design uses SMC or when system demands >1 kW surge handling beyond SMBJ48C's 600 W rating. |
Compared with SMAJ48A and 1.5SMC47C, SMBJ48C delivers optimal balance of 600 W surge capacity, compact DO-214AA footprint, and automotive-grade ISO 7637-2 validation - making it the preferred choice for space-constrained 48 V ECU and industrial control designs requiring proven transient immunity without over-engineering.
Availability
SMBJ48C is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC input protection, and LED streetlight driver applications requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMBJ48C 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The SMBJ series was designed specifically for robust, high-reliability transient suppression in automotive, industrial, and telecom infrastructure - emphasizing ISO-compliant surge handling, automated assembly compatibility, and extended temperature operation.
FAQ
What is the polarity configuration of SMBJ48C?
SMBJ48C is a unidirectional TVS diode, marked with a cathode band indicating the cathode terminal. It conducts only during reverse overvoltage events - i.e., when the cathode is at higher potential than the anode - and blocks forward current like a standard diode. This configuration is confirmed in the "Devices for Bipolar Applications" section of the datasheet, which specifies that the "C" suffix denotes unidirectional types, distinct from "CA" bidirectional variants.
Does SMBJ48C meet automotive transient immunity standards?
Yes, SMBJ48C meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line disturbance), as explicitly stated in its FEATURES list. Its 600 W peak pulse power, 85.5 V clamping voltage at 7.3 A, and -55°C to +150°C operating range make it suitable for engine control units, body control modules, and ADAS power rails where standardized surge immunity is mandatory.
What is the maximum clamping voltage of SMBJ48C under surge conditions?
The maximum clamping voltage of SMBJ48C is 85.5 V, measured at a peak impulse current (IPP) of 7.3 A using the standard 10/1000 µs waveform. This value is specified in the ELECTRICAL SPECIFICATIONS table for part number SMBJ48 and is critical for ensuring downstream components - such as 100 V-rated MOSFETs or 65 V-input DC-DC controllers - remain within their absolute maximum ratings during transient events.
Is SMBJ48C compatible with lead-free reflow soldering processes?
Yes, SMBJ48C is fully compatible with lead-free reflow soldering. Its matte tin-plated leads comply with J-STD-002 for solderability, and its moisture sensitivity level is rated J-STD-020 Level 1 - meaning it can be stored indefinitely at ambient conditions and placed directly into standard Pb-free reflow profiles (e.g., JEDEC J-STD-020D peak temp up to 260°C) without baking or special handling.
How does SMBJ48C differ from SMBJ48A?
SMBJ48C has a breakdown voltage range of 53.3–65.1 V and clamps at 85.5 V, while SMBJ48A offers tighter VBR (53.3–58.9 V) and lower clamping voltage (77.4 V). The "A" suffix indicates enhanced VBR tolerance and improved clamping performance, but both share identical package (DO-214AA), power rating (600 W), and application scope. SMBJ48C is the standard variant; SMBJ48A is selected when tighter parametric control is required.
SMBJ48C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 85.5V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ48C FAQ
1.How can I place an order for SMBJ48C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48C 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 SMBJ48C reliable?
The price and inventory of SMBJ48C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48C is usually 5 days.
3.What payment methods are accepted for SMBJ48C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48C?
SMBJ48C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48C 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 SMBJ48C?
For technical support, including SMBJ48C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48C requirements.
6.How does Aetrix verify that SMBJ48C is sourced from the original manufacturer or authorized distributors?
All SMBJ48C 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 SMBJ48C meets industry standards.
7.What is the process for return or replacement of SMBJ48C?
All SMBJ48C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48C, 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 SMBJ48C part is unused and in its original packaging.
Return procedure for SMBJ48C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48C Tags
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