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Taiwan Semiconductor Corporation SMBJ48CH
- Part No.:
- SMBJ48CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CH.pdf
- Description:
- 600W, 59.3V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,692
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Product details
Overview
SMBJ48CH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in power rails and signal lines. 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. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
For engineers reviewing the SMBJ48CH datasheet, SMBJ48CH pinout, SMBJ48CH application, or SMBJ48CH equivalent, this device is selected for robust overvoltage protection in 12 V/24 V automotive subsystems, industrial I/O interfaces, and DC power input stages where low-leakage (<1 µA @ 48 V), fast clamping, and high-reliability packaging are critical.
Technical Context
The SMBJ48CH implements a silicon avalanche diode structure with glass-passivated junction for stable breakdown and low leakage. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating circuits without polarity constraints.
It operates within –55 °C to +150 °C junction temperature range, supports 10/1000 µs surge waveforms per ANSI/IEEE C62.35, and delivers 85.5 V clamping at 7.3 A IPP - enabling protection of downstream 5 V or 3.3 V logic with margin against overshoot during load dump or inductive switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before significant leakage; sets safe DC rail margin for 48 V nominal systems. |
| VBR min/max | 53.3 V / 65.1 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system transients but below IC absolute max ratings. |
| VC @ IPP | 85.5 V @ 7.3 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress on protected circuitry. |
| PPK | 600 W - Peak pulse power handling capability; supports single-event surges up to 7.3 A without failure. |
| ID @ VWM | <1 µA - Ultra-low blocking leakage at rated stand-off; avoids power loss or false triggering in high-impedance sensing paths. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and thermally constrained PCB layouts. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; informs derating requirements for sustained surge duty cycles. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with cathode band omitted (symmetrical terminals). Matte tin-plated leads, RoHS and halogen-free compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically in bidirectional mode; no polarity marking required; connects across protected line and ground or between differential lines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD testing - eliminates need for additional qualification by Tier 1 suppliers. |
| ISO 7637-2 compliance | Passes Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - covers full automotive EMC immunity scope. |
| Glass-passivated junction | Ensures stable VBR tolerance and low IR drift over lifetime and temperature - critical for long-term reliability in unregulated environments. |
| Fast response time | <1.0 ps - Limits voltage overshoot before clamping engages, protecting sensitive gate oxides and analog front-ends. |
| DO-214AA (SMB) package | Industry-standard footprint with 0.090 g mass and UL 94V-0 molding - enables automated placement and compatibility with existing reflow profiles. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs, lighting modules, and body control units from load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp transients before they reach LDOs, microcontrollers, or CAN transceivers. Use Value: Withstands 600 W surges and clamps to 85.5 V, ensuring downstream 5 V regulators remain within safe input limits during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding 4–20 mA current loop inputs and RS-485 transceivers in factory automation PLCs from EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Placed differentially across signal pair or common-mode from signal to ground to suppress fast transients without distorting analog signals. Use Value: Sub-1 ps response and <1 µA leakage preserve signal integrity and minimize offset error in precision sensor conditioning circuits. |
| DC Power Input Stage Protection | LED Driver Transient Suppression |
Use Scenario: Safeguarding switched-mode power supplies and DC-DC converters in telecom and industrial equipment from AC line transients and inductive kickback. IC Role / Device Role / Timing Role: Mounted at input filter stage to absorb energy from 10/1000 µs surges before reaching rectifiers and primary-side controllers. Use Value: 600 W peak power rating and 55 °C/W RθJA allow effective thermal management without heatsinking in compact enclosures. |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers due to inductive switching spikes from relay-controlled strings or dimming circuits. IC Role / Device Role / Timing Role: Connected across driver output terminals to clamp voltage overshoot during MOSFET turn-off transitions. Use Value: 85.5 V clamping voltage provides sufficient margin above typical 48 V LED string forward voltage while limiting stress on driver FETs. |
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 SMAJ48CA | Same DO-214AC (SMA) package; 48 V VWM, 85.5 V VC @ 7.3 A, but lower PPK = 400 W and higher RθJA = 65 °C/W. | Lower power handling limits suitability for repetitive surge environments or high-temperature ambient conditions. | Select when cost sensitivity outweighs peak power margin and board space allows larger thermal relief. |
| ON Semiconductor SMCJ48CA | DO-214AB (SMC) package; identical VWM/VC specs but 1500 W PPK, higher IPP = 15.5 A, and larger footprint. | Higher surge capacity suits heavy-duty industrial motor drives but requires PCB redesign due to larger SMC outline. | Choose when system-level surge test requirements exceed 600 W or legacy designs already use SMC footprints. |
Compared with SMAJ48CA and SMCJ48CA, the SMBJ48CH offers optimal balance of AEC-Q101 qualification, 600 W capability, and DO-214AA footprint - making it preferred for space-constrained automotive and industrial modules requiring certified reliability without layout change.
Availability
SMBJ48CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and DC power input protection requiring stable component supply, traceable sourcing, and lifecycle continuity.
Supply support for SMBJ48CH 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 distribution and AEC-Q101 validation capabilities.
The SMBJH series was developed specifically for automotive and industrial transient suppression, emphasizing robustness under ISO 7637-2 pulses, low leakage, and surface-mount manufacturability in DO-214AA packages.
FAQ
What does the "CH" suffix indicate in SMBJ48CH?
The "CH" suffix in SMBJ48CH denotes a bidirectional configuration with symmetrical clamping behavior in both polarities. Unlike unidirectional variants (e.g., SMBJ48H), the SMBJ48CH has no cathode marking and is used where voltage transients may occur with either polarity - such as across differential signal lines or AC-coupled power rails. This matches the electrical specifications shown for VBR min/max and VC in both directions.
Is SMBJ48CH compatible with lead-free reflow soldering processes?
Yes, SMBJ48CH is fully compatible with standard lead-free reflow profiles. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the DO-214AA (SMB) package is rated for peak temperatures up to 260 °C per JEDEC J-STD-020. The device's moisture sensitivity level is rated at Level 1, meaning it can be stored indefinitely at ambient conditions without baking prior to assembly.
How does SMBJ48CH perform under repeated surge stress?
SMBJ48CH is rated for non-repetitive 10/1000 µs surges per ANSI/IEEE C62.35. While it withstands single 600 W events, repeated surges require derating per Figure 2 in the datasheet: at 70 °C ambient, its peak pulse power drops to ~420 W. For applications expecting frequent transients, thermal design must ensure junction temperature remains ≤150 °C, and cumulative energy should stay below 10% of single-pulse rating to maintain long-term reliability.
Does SMBJ48CH meet automotive EMC standards beyond ISO 7637-2?
SMBJ48CH is explicitly validated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements, covering conducted transients in 12 V and 24 V vehicle networks. It is not tested or certified to ISO 11452 (radiated immunity) or CISPR 25 (EMI emissions), as those apply to complete systems - not individual TVS components. System-level compliance depends on PCB layout, grounding, and filtering in conjunction with SMBJ48CH placement.
What is the typical junction capacitance of SMBJ48CH at zero bias?
The typical junction capacitance of SMBJ48CH is 120 pF at VR = 0 V and f = 1.0 MHz, as shown in Figure 5 of the datasheet. This value increases slightly as reverse voltage decreases toward zero, but remains well below 200 pF across its operating range. For high-speed data lines (e.g., USB, CAN FD), this capacitance may introduce signal distortion - in such cases, lower-capacitance TVS arrays or specialized ESD protection devices are recommended instead of SMBJ48CH.
SMBJ48CH 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:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ48CH FAQ
1.How can I place an order for SMBJ48CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CH 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 SMBJ48CH reliable?
The price and inventory of SMBJ48CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48CH is usually 5 days.
3.What payment methods are accepted for SMBJ48CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CH?
SMBJ48CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CH 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 SMBJ48CH?
For technical support, including SMBJ48CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CH requirements.
6.How does Aetrix verify that SMBJ48CH is sourced from the original manufacturer or authorized distributors?
All SMBJ48CH 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 SMBJ48CH meets industry standards.
7.What is the process for return or replacement of SMBJ48CH?
All SMBJ48CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CH, 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 SMBJ48CH part is unused and in its original packaging.
Return procedure for SMBJ48CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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