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Vishay General Semiconductor - Diodes Division SMBJ48CHE3/5B
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- Part No.:
- SMBJ48CHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CHE3/5B.pdf
- Description:
- TVS DIODE 48VWM 85.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,084
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Product details
Overview
SMBJ48CHE3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 77.4 V maximum clamping voltage (VC) at 7.8 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the SMBJ48CHE3/5B datasheet, SMBJ48CHE3/5B pinout, SMBJ48CHE3/5B application, or SMBJ48CHE3/5B equivalent, key selection criteria include clamping voltage margin vs. protected device's absolute maximum rating, junction temperature derating above 25 °C, unidirectional polarity marking (cathode band), and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
This TVS diode operates as a voltage-clamping protection device: under normal conditions it presents high impedance (>1 MΩ leakage at VWM), but conducts heavily when reverse voltage exceeds VBR, limiting transient energy by shunting surge current to ground. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
It is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), 150 °C max junction temperature, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. The SMB package provides 100 °C/W junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 48 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below protected circuit's max rating. |
| VBR (Breakdown Voltage) | 53.3–58.9 V at 1 mA - Voltage at which device enters avalanche conduction; tight tolerance enables precise overvoltage threshold setting. |
| VC (Clamping Voltage) | 77.4 V at IPPM = 7.8 A - Maximum voltage seen by protected circuit during 10/1000 µs surge; determines whether downstream components remain within safe operating area. |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs) - Surge energy handling capability; defines immunity level against common lightning-induced or inductive-switching transients. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Low leakage preserves system efficiency and avoids false triggering in high-impedance sensing paths. |
| TJ max. | 150 °C - Maximum junction temperature; sets thermal design limits for PCB copper pad area and ambient operating envelope. |
| AEC-Q101 Qualified | Yes - Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces per stress test requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1, 260 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when voltage exceeds VBR - polarity must match circuit grounding scheme. |
| Anode | Reference/ground return path | Typically tied to system ground plane; low-inductance connection required to minimize clamping voltage overshoot during fast transients. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 3/4 surges without external series impedance. |
| Glass passivated chip junction | Ensures stable VBR over lifetime and temperature, critical for long-term reliability in automotive under-hood environments. |
| AEC-Q101 qualification (HE3 suffix) | Validates performance under temperature cycling, humidity, mechanical shock, and ESD stress required for automotive ECUs and sensors. |
| Low profile SMB package | 0.220" × 0.155" footprint supports high-density PCB layouts while maintaining thermal dissipation via 0.2" × 0.2" copper pads. |
| 100 A IFSM (8.3 ms) | Withstands repetitive load dump events in 12 V automotive systems without degradation. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting microcontroller power rails in vehicle body control modules exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between +12 V input and chassis ground to limit voltage spikes to <80 V. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V LDO regulators and MCU inputs during ISO 16750-2 load dump events (up to 35 V, 400 ms). |
Use Scenario: Shielding analog output lines of pressure or temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to clamp ESD (IEC 61000-4-2 ±8 kV contact) and inductive switching noise on 4–20 mA loops. Use Value: Maintains signal integrity by limiting transient voltage to <78 V, well below op-amp input absolute maximum ratings, without adding capacitance that distorts loop response. |
| DC-DC Converter Input Stage | Telecom Power Interface |
|
Use Scenario: Safeguarding buck converter front-end in telecom base station power supplies subjected to lightning-induced surges on -48 V DC bus. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-input rail to clamp negative-going transients and positive surges. Use Value: Withstands 600 W pulses without failure, enabling compliance with ITU-T K.20 surge immunity requirements for central office equipment. |
Use Scenario: Protecting PoE (Power over Ethernet) midspan injector outputs against cable discharge events and field wiring faults. IC Role / Device Role / Timing Role: TVS placed across each DC pair (e.g., pins 4–5 and 7–8) to clamp common-mode surges up to 100 V. Use Value: Fast response (<1 ns) and low clamping voltage ensure IEEE 802.3af/at PD interface ICs remain undamaged during hot-plug or short-circuit transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A-E3/5B | No AEC-Q101 qualification; commercial-grade only; same electrical specs and SMB package. | Not suitable for automotive production; acceptable for industrial or consumer prototypes where qualification is not mandated. | Select SMBJ48A-E3/5B if AEC-Q101 is unnecessary and cost sensitivity outweighs long-term automotive reliability requirements. |
| SMCJ48AHE3_A/H | Larger SMC (DO-214AB) package; higher 1500 W PPPM rating; identical VWM/VBR/VC specs. | Better thermal performance and surge margin; requires larger PCB area and different pad layout. | Choose SMCJ48AHE3_A/H when system-level surge testing exceeds 600 W or board layout allows SMC footprint for enhanced ruggedness. |
Compared with SMBJ48A-E3/5B, SMBJ48CHE3/5B adds automotive-grade reliability validation without changing clamping behavior; versus SMCJ48AHE3_A/H, it trades surge headroom and thermal margin for compactness and lower assembly cost in space-constrained designs.
Availability
SMBJ48CHE3/5B is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, DC-DC converter inputs, and telecom power interfaces requiring stable component supply with AEC-Q101 assurance and consistent SMB package logistics.
Supply support for SMBJ48CHE3/5B 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific validation.
The SMBJ series is engineered for robust transient suppression in harsh environments-designed to meet automotive, industrial, and telecom surge immunity standards while maintaining tight parametric consistency across temperature and life cycle.
FAQ
What is the clamping voltage of SMBJ48CHE3/5B at its rated peak pulse current?
The SMBJ48CHE3/5B has a maximum clamping voltage (VC) of 77.4 V at its specified peak pulse current (IPPM) of 7.8 A using the 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. Engineers must verify that this clamping level remains safely below the absolute maximum voltage rating of downstream components such as MOSFETs or regulator ICs in the SMBJ48CHE3/5B-protected design.
Is SMBJ48CHE3/5B suitable for bidirectional transient protection?
No, SMBJ48CHE3/5B is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias above VBR and blocks forward current like a standard diode. For bidirectional protection-such as AC lines or differential data buses-the SMBJ48CA variant must be used. Using SMBJ48CHE3/5B in bidirectional applications risks failure during positive half-cycle transients, as it lacks symmetrical breakdown capability.
How does the HE3 suffix affect the specifications of SMBJ48CHE3/5B?
The HE3 suffix denotes RoHS-compliant construction with AEC-Q101 qualification, distinguishing SMBJ48CHE3/5B from commercial-grade variants like SMBJ48A-E3/5B. Electrically, all parameters-including VWM, VBR, VC, and PPPM-are identical. However, HE3 parts undergo extended stress testing (temperature cycling, humidity, mechanical shock) required for automotive use, and their manufacturing traceability and lot control meet automotive quality system requirements. The SMBJ48CHE3/5B thus delivers identical protection performance with certified reliability for automotive production.
What is the thermal resistance of SMBJ48CHE3/5B, and how does it impact layout?
The SMBJ48CHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value directly impacts maximum allowable power dissipation at elevated ambient temperatures: for example, at TA = 85 °C, derated power drops to ~3.1 W. To maintain reliability, PCB layout must provide adequate copper area and avoid thermal bottlenecks-especially critical in automotive under-hood applications where ambient temperatures exceed 105 °C. The SMBJ48CHE3/5B datasheet provides derating curves for precise thermal design.
Can SMBJ48CHE3/5B replace SMBJ48A-E3/5B in an existing design?
Yes, SMBJ48CHE3/5B is a direct form-fit-function replacement for SMBJ48A-E3/5B in terms of package (SMB), pinout, and electrical specifications-including VWM = 48 V, VBR = 53.3–58.9 V, and VC = 77.4 V. The only difference is the AEC-Q101 qualification embedded in the HE3 suffix. No PCB or schematic changes are needed; however, adopting SMBJ48CHE3/5B introduces automotive-grade reliability validation, making it suitable for production in vehicles or industrial systems requiring extended lifetime and environmental stress resilience beyond commercial-grade requirements.
SMBJ48CHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 7A
- 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 (SMBJ)
SMBJ48CHE3/5B FAQ
1.How can I place an order for SMBJ48CHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CHE3/5B 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 SMBJ48CHE3/5B reliable?
The price and inventory of SMBJ48CHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48CHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ48CHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CHE3/5B?
SMBJ48CHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CHE3/5B 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 SMBJ48CHE3/5B?
For technical support, including SMBJ48CHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CHE3/5B requirements.
6.How does Aetrix verify that SMBJ48CHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ48CHE3/5B 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 SMBJ48CHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ48CHE3/5B?
All SMBJ48CHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CHE3/5B, 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 SMBJ48CHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ48CHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48CHE3/5B Tags
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