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Taiwan Semiconductor Corporation SMBJ48AH
- Part No.:
- SMBJ48AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48AH.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,621
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Product details
Overview
SMBJ48AH 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 and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ48AH datasheet, SMBJ48AH pinout, SMBJ48AH application, or SMBJ48AH equivalent, this device is selected for high-reliability DC power line protection where low leakage (<1 µA @ 48V), AEC-Q101 qualification, and fast sub-1ps response time are critical design requirements.
Technical Context
The SMBJ48AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling robust ESD and electrical fast transient (EFT) immunity per IEC 61000-4-2/4-4. Its breakdown voltage range is 53.3–58.9V at 1mA test current, ensuring precise overvoltage thresholding before clamping.
Thermal performance is defined by 10°C/W junction-to-case and 55°C/W junction-to-ambient resistance, supporting continuous operation up to +150°C junction temperature. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level surge immunity threshold. |
| VBR min/max | 53.3 V / 58.9 V @ 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM for stable clamping behavior. |
| VC @ IPP | 77.4 V @ 8.1 A - Clamping voltage under 10/1000µs surge defines worst-case voltage seen by protected ICs during transient events. |
| PPK | 600 W - Peak pulse power rating determines survivability against standardized automotive load-dump and inductive-switching surges. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves efficiency in always-on 48V systems and avoids false triggering in high-impedance sensing paths. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and industrial motor drive control modules. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; forms return path during clamping event. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 48V supply); conducts avalanche current when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Clamping voltage ≤77.4 V | Ensures downstream 48V-rated components (e.g., CAN transceivers, MCU I/O) remain within absolute maximum ratings during ISO 7637-2 Pulse 2b (inductive load dump). |
| Response time <1 ps | Enables suppression of nanosecond-scale ESD events before damage occurs to sensitive analog front-ends or communication interfaces. |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow assembly - supports high-yield automated SMT production without process interruption. |
Applications
| Automotive Power Rail Protection | Industrial 48V DC Distribution |
|---|---|
Use Scenario: Protecting 48V battery-fed ECUs from load dump and alternator surge transients in mild-hybrid vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp transients before they reach regulation circuitry. Use Value: Withstands 600W 10/1000µs pulses and maintains <1 µA leakage at 48V, minimizing standby power loss while meeting ISO 7637-2 Pulse 5a compliance. |
Use Scenario: Safeguarding programmable logic controllers (PLCs) and I/O modules powered from centralized 48V backplanes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-wiring terminals exposed to inductive switching noise from solenoids and relays. Use Value: 77.4V clamping voltage ensures connected 24V/48V-rated digital isolators and RS-485 transceivers operate within safe voltage margins during 100A surge events. |
| LED Driver Input Stage | Telecom Power Interface |
Use Scenario: Front-end protection for constant-current LED drivers used in commercial lighting systems with long cable runs. IC Role / Device Role / Timing Role: Standoff diode across input capacitor to absorb induced lightning-induced surges and EFT bursts entering via AC/DC primary side. Use Value: Glass-passivated junction and 150°C TJ rating allow operation in enclosed luminaires; 53.3–58.9V VBR ensures clean turn-on without premature conduction during normal 48V operation. |
Use Scenario: Surge protection on 48V phantom power inputs of PoE-powered base stations and remote radio units. IC Role / Device Role / Timing Role: First-line defense against induced surges from nearby lightning strikes on outdoor cabling infrastructure. Use Value: Meets IEC 61000-4-5 Level 4 (4kV line-earth) when combined with series impedance; DO-214AA footprint enables compact layout adjacent to connector entry points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ48A | Same DO-214AC (SMA) package; 77.4V VC @ 8.1A but higher RθJA (65°C/W vs. 55°C/W); no AEC-Q101 certification. | Not qualified for automotive under-hood use; suitable for industrial/commercial only. | Select when cost sensitivity outweighs automotive qualification and thermal derating margin is acceptable. |
| Vishay SMF48A | DO-219AB (SOD-123FL) package; lower PPK (400W); identical VWM (48V) and VC (77.4V), but smaller footprint and lower thermal mass. | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump. | Choose for space-constrained consumer or telecom designs where 400W surge capability suffices. |
Compared with SMAJ48A and SMF48A, the SMBJ48AH delivers superior thermal performance and automotive qualification in a proven DO-214AA platform - making it the preferred choice for 48V systems requiring sustained reliability under repeated surge stress and high ambient temperatures.
Availability
SMBJ48AH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial 48V DC distribution, and LED driver input stage applications requiring stable component supply across multi-year production cycles.
Supply support for SMBJ48AH 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, and rectifiers with global automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12V–170V automotive and industrial power systems, emphasizing low clamping voltage, high surge robustness, and automated assembly compatibility.
FAQ
What is the breakdown voltage range of SMBJ48AH?
The SMBJ48AH has a minimum breakdown voltage (VBR) of 53.3 V and a maximum of 58.9 V at 1 mA test current, measured per ANSI/IEEE C62.35. This tight VBR window ensures consistent clamping onset across production lots and supports reliable overvoltage protection design margins in 48V systems where the SMBJ48AH is deployed.
Is SMBJ48AH suitable for bidirectional transient protection?
No - SMBJ48AH is a unidirectional TVS diode intended for DC line protection with defined anode-cathode polarity. For bidirectional applications such as AC signal lines or differential buses, the SMBJ48CAH variant must be used instead, as explicitly stated in the datasheet's "Devices for Bipolar Applications" section.
Does SMBJ48AH meet automotive qualification standards?
Yes - SMBJ48AH is AEC-Q101 qualified and tested for temperature cycling, highly accelerated life testing (HALT), and ESD per JESD22-A114. It also complies with ISO 7637-2 Pulse 1/2a/2b/3a/3b, making it suitable for engine control units, body control modules, and other automotive electronics where the SMBJ48AH serves as primary surge protection.
What is the maximum clamping voltage of SMBJ48AH under surge conditions?
The SMBJ48AH exhibits a maximum clamping voltage (VC) of 77.4 V when subjected to an 8.1 A peak impulse current with a 10/1000 µs waveform. This value is guaranteed across temperature and lifetime, defining the upper voltage limit imposed on protected circuitry during transient events where the SMBJ48AH activates.
Can SMBJ48AH be used in high-humidity environments?
Yes - SMBJ48AH is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at standard ambient conditions without baking. Its DO-214AA molding compound meets UL 94V-0 flammability and provides hermetic protection, supporting reliable operation in humid industrial and automotive under-hood environments where the SMBJ48AH is installed.
SMBJ48AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 8.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ48AH FAQ
1.How can I place an order for SMBJ48AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48AH 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 SMBJ48AH reliable?
The price and inventory of SMBJ48AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48AH is usually 5 days.
3.What payment methods are accepted for SMBJ48AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48AH?
SMBJ48AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48AH 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 SMBJ48AH?
For technical support, including SMBJ48AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48AH requirements.
6.How does Aetrix verify that SMBJ48AH is sourced from the original manufacturer or authorized distributors?
All SMBJ48AH 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 SMBJ48AH meets industry standards.
7.What is the process for return or replacement of SMBJ48AH?
All SMBJ48AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48AH, 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 SMBJ48AH part is unused and in its original packaging.
Return procedure for SMBJ48AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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