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Taiwan Semiconductor Corporation SMBJ48H
- Part No.:
- SMBJ48H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48H.pdf
- Description:
- 600W, 59.2V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,710
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Product details
Overview
SMBJ48H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in automotive and industrial power rails. It features a 48 V working stand-off voltage (VWM), 53.3–65.1 V breakdown voltage (VBR), 85.5 V maximum clamping voltage (VC) at 7.3 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time - deployed to protect CAN, LIN, and 12 V/24 V supply lines against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ48H datasheet, SMBJ48H pinout, SMBJ48H application, or SMBJ48H equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity marking, DO-214AA (SMB) package thermal resistance (RθJA = 55 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The SMBJ48H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient suppression (<1.0 ps response) and low leakage (<1 µA at 48 V). Its clamping behavior is defined by a 10/1000 µs waveform, with VC = 85.5 V at IPP = 7.3 A, ensuring predictable overvoltage limiting during load dump or inductive switching events.
Thermally, it supports junction temperatures from –55 °C to +150 °C, with RθJC = 10 °C/W and RθJA = 55 °C/W, enabling reliable operation in under-hood automotive environments. It meets ISO 7637-2 Pulse 1 (inductive flyback), Pulse 2a/2b (battery disconnect/relay bounce), and Pulse 3a/3b (switching noise) immunity requirements without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12 V/24 V systems. |
| VBR min/max | 53.3 V / 65.1 V @ 1 mA - Ensures consistent avalanche initiation across production lots; guarantees turn-on within spec under worst-case temperature drift. |
| VC @ IPP | 85.5 V @ 7.3 A (10/1000 µs) - Peak clamped voltage seen by protected IC; determines minimum required voltage headroom for downstream components. |
| PPK | 600 W - Surge energy handling capability per single transient; sufficient for ISO 7637-2 Pulse 1 (load dump) on 12 V lines. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life in always-on automotive modules (e.g., body control units). |
| TJ max | +150 °C - Enables placement near heat sources (e.g., power converters) without derating concerns in engine compartment designs. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with 0.090 g mass; compatible with automated pick-and-place and reflow profiles per J-STD-020 Level 1. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking for unidirectional polarity, UL 94V-0 rated compound, and JESD 201 Class 2 whisker resistance. Weight: 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during positive transients on cathode side. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); conducts avalanche current to anode when voltage exceeds VBR, diverting surge energy away from ICs. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity, and mechanical shock per stress test requirements. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal cycling and humidity exposure in harsh environments. |
| Clamping voltage ≤85.5 V | Provides tight overvoltage protection margin for 3.3 V/5 V logic interfaces powered from protected 12 V rails. |
| ISO 7637-2 compliance | Guarantees robustness against real-world automotive transients including load dump (Pulse 1), relay bounce (Pulse 2b), and EFT (Pulse 3b). |
| Moisture sensitivity level 1 | Enables standard SMT assembly without baking; eliminates moisture-related popcorning risk during reflow. |
Applications
| Automotive Power Rail Protection | CAN/LIN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp transients before they reach LDOs or microcontrollers. Use Value: Limits peak voltage to 85.5 V during ISO 7637-2 Pulse 1, preventing latch-up or permanent damage to 100 V-rated input stages. |
Use Scenario: Shielding CAN transceivers (e.g., TJA1042) from ESD and coupled noise on differential bus lines. IC Role / Device Role / Timing Role: Single-diode TVS connected from CAN_H to ground, suppressing common-mode surges while preserving signal integrity. Use Value: Sub-1 ps response ensures clamping occurs before transceiver input structures are stressed, maintaining >2 Mbps data integrity. |
| Industrial Sensor Interface Protection | LED Driver Input Stage Protection |
Use Scenario: Safeguarding analog sensor front-ends (e.g., pressure, temperature) in factory automation equipment exposed to relay switching noise. IC Role / Device Role / Timing Role: TVS placed at 24 V supply input of signal conditioning circuitry to absorb inductive kickback from solenoid drivers. Use Value: 600 W peak power rating handles repetitive 10/1000 µs pulses from nearby contactors without degradation over 10+ years of operation. |
Use Scenario: Preventing overvoltage failure in constant-current LED drivers subjected to hot-plug or cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS on driver VIN pin to shunt surge current away from internal MOSFET gate oxide and controller IC. Use Value: 48 V VWM aligns with typical 48 V LED system rails; 85.5 V VC ensures driver ICs with 100 V absolute max ratings remain within safe operating area. |
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; slightly higher VC = 77.4 V @ 7.3 A; lower PPK = 400 W. | Lower surge rating limits suitability for ISO 7637-2 Pulse 1; better fit for ESD-only or low-energy EFT scenarios. | Select SMAJ48A only if board space allows SMA footprint and system surge energy is confirmed ≤400 W. |
| ON Semiconductor 1.5SMC47A | DO-214AB (SMC) package; larger footprint; VC = 77.0 V @ 7.7 A; PPK = 1500 W. | Higher surge capacity suits heavy-duty industrial motor drives but requires PCB layout change and increased thermal mass. | Choose 1.5SMC47A when protecting high-power inverters where 600 W is insufficient and DO-214AA space constraints do not apply. |
Compared with SMAJ48A and 1.5SMC47A, the SMBJ48H uniquely balances AEC-Q101 qualification, DO-214AA compactness, and full 600 W ISO 7637-2 compliance - making it optimal for space-constrained automotive modules requiring certified surge resilience without footprint compromise.
Availability
SMBJ48H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and LED driver input protection requiring stable component supply and AEC-Q101 traceability.
Supply support for SMBJ48H 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 protection in 12 V/24 V automotive subsystems, emphasizing low clamping voltage, high surge robustness, and surface-mount manufacturability.
FAQ
What is the clamping voltage of SMBJ48H under standard 10/1000 µs surge conditions?
The SMBJ48H has a maximum clamping voltage (VC) of 85.5 V when subjected to a 10/1000 µs waveform at 7.3 A peak impulse current. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage seen by downstream circuitry during surge events - critical for verifying compatibility with IC absolute maximum ratings in automotive power domains.
Is SMBJ48H suitable for bidirectional transient protection applications?
No, SMBJ48H is a unidirectional TVS diode, indicated by its "H" suffix and cathode band marking. For bidirectional protection, Taiwan Semiconductor specifies the SMBJ48AH variant (with "AH" suffix), which provides symmetrical clamping in both polarities and is used in AC-coupled or floating signal line protection.
Does SMBJ48H meet automotive qualification standards?
Yes, SMBJ48H is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its construction - including glass-passivated junction, JESD 201 Class 2 whisker resistance, and moisture sensitivity level 1 - satisfies full automotive reliability screening.
What is the thermal resistance profile of SMBJ48H, and how does it affect PCB layout?
SMBJ48H has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W and junction-to-case (RθJC) of 10 °C/W. To maintain TJ ≤150 °C under sustained 3 W dissipation, the PCB must provide ≥100 mm² of 1 oz copper pour connected to both terminals - especially critical in under-hood modules where ambient temperatures exceed 85 °C.
How does the leakage current of SMBJ48H impact battery-powered automotive modules?
SMBJ48H exhibits ≤1 µA blocking leakage current at its 48 V working stand-off voltage, minimizing parasitic drain on vehicle batteries during sleep mode. This enables compliance with UCI (Unified Communication Interface) and OEM quiescent current budgets (<100 µA total for body electronics), supporting multi-year battery life in always-on telematics units.
SMBJ48H 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:
- 85.5V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- 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)
SMBJ48H FAQ
1.How can I place an order for SMBJ48H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48H 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 SMBJ48H reliable?
The price and inventory of SMBJ48H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48H is usually 5 days.
3.What payment methods are accepted for SMBJ48H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48H?
SMBJ48H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48H 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 SMBJ48H?
For technical support, including SMBJ48H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48H requirements.
6.How does Aetrix verify that SMBJ48H is sourced from the original manufacturer or authorized distributors?
All SMBJ48H 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 SMBJ48H meets industry standards.
7.What is the process for return or replacement of SMBJ48H?
All SMBJ48H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48H, 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 SMBJ48H part is unused and in its original packaging.
Return procedure for SMBJ48H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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