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Taiwan Semiconductor Corporation SMBJ48A
- Part No.:
- SMBJ48A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:12,970
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Product details
Overview
SMBJ48A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 48V working stand-off voltage (VWM), and 77.4V maximum clamping voltage (VC) at 8.1A peak impulse current - designed to protect automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ48A datasheet, SMBJ48A pinout, SMBJ48A application, or SMBJ48A equivalent, this page delivers verified electrical parameters, thermal performance data, polarity marking details, and direct alternatives for ESD and inductive switching surge protection in 12–48V systems.
Technical Context
The SMBJ48A operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response time and low leakage (<1μA at 48V). Its breakdown voltage is specified at 53.3–58.9V (IT = 1mA), ensuring reliable triggering above system operating voltage while maintaining tight VBR tolerance.
Thermally, it features RθJC = 10°C/W and RθJA = 55°C/W, supporting continuous operation up to TJ = +150°C. Polarity is marked by cathode band; mounting follows JEDEC DO-214AA footprint with matte tin-plated leads compliant with J-STD-002 solderability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit DC rail. |
| VBR min/max | 53.3 / 58.9 V @ 1 mA - Confirmed breakdown range ensures predictable turn-on margin above VWM. |
| VC @ IPP | 77.4 V @ 8.1 A - Clamping voltage under 10/1000µs surge defines worst-case overvoltage seen by downstream ICs. |
| PPK | 600 W - Peak pulse power rating per 10/1000µs waveform; determines transient energy absorption capability. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature enables use in under-hood automotive and industrial environments. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode configuration with cathode band marking on one end. Dimensions comply with JEDEC standard; recommended pad layout provided in manufacturer datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Connected to system GND; forms return path during clamping event. |
| Cathode | High-side connection to protected line (e.g., 48V rail) | Marked by band; connects to input line being protected - reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress. |
| Response time <1 ps | Clamps transients before sensitive ICs experience damaging overvoltage - critical for CAN, LIN, and sensor interface protection. |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive load-dump and inductive switching immunity testing without external filtering. |
| Moisture sensitivity level 1 | Allows unlimited floor life and standard reflow without baking - simplifies SMT manufacturing flow. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48V battery-fed ECUs from load dump and alternator transients in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48V supply and GND, clamping surges within 1ps to limit voltage to ≤77.4V. Use Value: Prevents damage to PMICs and microcontrollers during ISO 7637-2 Pulse 5a events up to 600W peak power. | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting fast transients before reaching ADC front-end or op-amp buffer. Use Value: Maintains signal fidelity with <1µA leakage at 48V and clamps ±8kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Input Protection | Motor Drive Control Signal Protection |
Use Scenario: Safeguarding 48V PoE-powered equipment inputs against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge clamp on DC input rail upstream of DC/DC converter, sized for 10/1000µs waveform compliance. Use Value: Absorbs 600W transient energy without degradation, meeting GR-1089-CORE Level 3 telecom surge requirements. | Use Scenario: Protecting gate driver enable lines and feedback signals in BLDC motor controllers exposed to inductive kickback. IC Role / Device Role / Timing Role: TVS placed across isolated control signal traces to suppress 100V/µs edge-induced coupling from power stage switching. Use Value: Limits coupled transients to ≤77.4V, preventing false triggering or latch-up in logic-level control ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA | Bidirectional version; symmetric VBR (53.3–58.9V) in both directions; same VWM and VC ratings. | Required where AC-coupled or dual-polarity signals (e.g., RS-485, CAN bus) need protection without polarity constraints. | Select SMBJ48CA only if bidirectional clamping is required; SMBJ48A is optimal for DC rails with defined polarity. |
| SAC48 | Same VWM (48V), but lower PPK (400W); higher VC (84V @ 4.8A); different package (DO-214AC/SMA). | Lower surge capacity suits cost-sensitive consumer electronics; SMA footprint requires PCB redesign. | Choose SAC48 only for space-constrained designs accepting reduced 400W rating and higher clamping voltage. |
Compared with SMBJ48CA and SAC48, the SMBJ48A provides optimal balance of 600W surge handling, 77.4V clamping, and DO-214AA compatibility for unidirectional 48V DC protection - making it preferred for automotive and industrial power rail applications where polarity is fixed and energy levels are high.
Availability
SMBJ48A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and 48V telecom power input protection requiring stable component supply and full traceability.
Supply support for SMBJ48A 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs - headquartered in Hsinchu, Taiwan.
The SMBJ series was developed specifically for robust, high-energy transient suppression in automotive, industrial, and telecom systems - emphasizing ISO 7637-2 compliance, low leakage, and JEDEC-standard surface-mount packaging.
FAQ
What is the clamping voltage of SMBJ48A under standard 10/1000µs surge conditions?
The SMBJ48A has a maximum clamping voltage (VC) of 77.4 V when subjected to an 8.1 A peak impulse current with a 10/1000µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ48A unidirectional or bidirectional, and how is polarity identified?
SMBJ48A is a unidirectional TVS diode. Polarity is indicated by a cathode band printed on the device body - the banded end connects to the protected line (e.g., 48V rail), while the opposite end connects to system ground. This configuration ensures reverse-bias operation during normal use and rapid avalanche conduction during overvoltage events.
Does SMBJ48A meet automotive transient immunity standards?
Yes, SMBJ48A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements - validated for load dump, battery disconnect, and inductive switching transients in 12V and 48V automotive systems. Its 600W peak power rating and 77.4V clamping voltage ensure compliance without additional filtering components.
What is the maximum junction temperature and thermal resistance of SMBJ48A?
The SMBJ48A has a maximum junction temperature (TJ) of +150°C and thermal resistances of RθJC = 10°C/W (junction-to-case) and RθJA = 55°C/W (junction-to-ambient). These values support reliable operation in high-temperature environments such as engine compartments or enclosed industrial enclosures when mounted on appropriate copper area.
How does SMBJ48A differ from SMBJ48 in terms of electrical performance?
SMBJ48A offers tighter breakdown voltage tolerance (53.3–58.9 V vs. 53.3–65.1 V for SMBJ48) and lower clamping voltage (77.4 V vs. 85.5 V at same IPP), resulting in superior protection margin for 48V systems. Both share identical package, power rating, and application scope - but SMBJ48A is preferred where precise voltage limiting is required.
SMBJ48A 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMBJ48A FAQ
1.How can I place an order for SMBJ48A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48A 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 SMBJ48A reliable?
The price and inventory of SMBJ48A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48A is usually 5 days.
3.What payment methods are accepted for SMBJ48A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48A?
SMBJ48A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48A 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 SMBJ48A?
For technical support, including SMBJ48A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48A requirements.
6.How does Aetrix verify that SMBJ48A is sourced from the original manufacturer or authorized distributors?
All SMBJ48A 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 SMBJ48A meets industry standards.
7.What is the process for return or replacement of SMBJ48A?
All SMBJ48A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48A, 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 SMBJ48A part is unused and in its original packaging.
Return procedure for SMBJ48A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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