My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMB8J28CA-M3/5B
;;2.jpg)
- Part No.:
- SMB8J28CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CA-M3/5B.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,414
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB8J28CA-M3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection with 800 W peak pulse power (10/1000 µs), 28 V stand-off voltage (VWM), and 45.4 V clamping voltage (VC) at 17.6 A peak pulse current. It protects signal lines and power rails in automotive sensor interfaces, industrial I/O modules, and telecom front-end circuits.
For engineers reviewing the SMB8J28CA-M3/5B datasheet, SMB8J28CA-M3/5B pinout, SMB8J28CA-M3/5B application, or SMB8J28CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the bidirectional configuration enables symmetrical clamping across both polarities without polarity sensitivity.
Designed for surface-mount use in space-constrained environments, SMB8J28CA-M3/5B meets MSL level 1 per J-STD-020 (260 °C peak reflow), supports 150 °C maximum junction temperature, and delivers consistent clamping performance under repetitive surge stress when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below system rail. |
| VBR (min/max) | 31.1 V / 34.4 V - Breakdown occurs within this range at 1 mA test current; ensures reliable turn-on above VWM. |
| VC @ IPPM | 45.4 V at 17.6 A - Clamping voltage during 10/1000 µs surge; limits downstream voltage stress to ≤45.4 V. |
| PPPM | 800 W - Peak pulse power handling capacity; determines survivability against standardized lightning/surge waveforms. |
| ID @ VWM | 1.0 µA - Reverse leakage at 28 V; negligible power loss and minimal impact on high-impedance signal integrity. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial ambient conditions. |
| RθJA | 72 °C/W - Thermal resistance junction-to-ambient; informs derating requirements when board copper area is limited. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional device with no polarity marking - terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both ends) | Surge current path | Identical bidirectional terminals; connects across protected line and ground (or between differential lines); no cathode band marking. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - suitable for engine control, ADAS sensors, and infotainment interfaces. |
| Halogen-free & RoHS-compliant (M3) | Meets JESD201 Class 2 whisker resistance and global environmental regulations - supports green manufacturing and export compliance. |
| Low-profile SMB package | Height ≤ 2.2 mm - enables placement in tight PCB spaces such as connector edges, PCB edge-mount zones, or stacked modules. |
| Fast response time | Sub-nanosecond clamping onset - mitigates ESD and fast-rising transients before sensitive ICs experience latch-up or gate oxide damage. |
| MSL Level 1 rating | Compatible with standard 260 °C lead-free reflow profiles without preconditioning - simplifies SMT line integration and eliminates moisture-sensitive handling steps. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD or LIN bus lines in automotive cabin sensors exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and chassis ground to limit transient overvoltage to <45.4 V. Use Value: Prevents communication failure and microcontroller reset during 12 V system load dump events up to 800 W energy. | Use Scenario: Shielding 24 V DC digital input channels in programmable logic controllers from relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing inductive kickback energy before it reaches optocoupler input stages. Use Value: Extends input circuit lifetime by limiting peak voltage to 45.4 V, well below 50 V absolute maximum ratings of common opto-isolators. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
Use Scenario: Safeguarding Ethernet PHY interface lines (e.g., MDI-X pairs) against lightning-induced surges in outdoor access points. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) referenced to local ground, clamping common-mode transients. Use Value: Maintains signal integrity up to 100 Mbps while surviving 800 W 10/1000 µs surges per IEC 61000-4-5 Level 3. | Use Scenario: Adding secondary-level ESD protection on USB 2.0 D+/D− lines behind integrated port protection in smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (CJ ≈ 100 pF at 0 V) placed directly at USB connector. Use Value: Passes USB 2.0 eye diagram compliance while suppressing ±15 kV contact ESD per IEC 61000-4-2 without signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J28CA-E3/5B | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | No difference in circuit function or layout; differs only in material composition (Br/Cl content). | Select when halogen-free requirement is not mandated by end-customer or regional regulation. |
| SMAJ28CA-QH | Lower PPPM (400 W), same VWM/VC, SMA package (larger footprint, higher RθJA). | Not suitable for 800 W surge environments; requires larger PCB area and thermal relief. | Choose only if cost or legacy inventory drives selection and surge threat level is confirmed ≤400 W. |
Compared with SMB8J28CA-M3/5B, the E3/5B variant offers identical protection performance with non-halogen-free construction, while SMAJ28CA-QH provides reduced surge capacity in a less thermally efficient package - neither is pin-compatible due to differing case outlines (SMB vs. SMA), requiring layout revision.
Availability
SMB8J28CA-M3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line interfaces, and consumer USB port protection requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J28CA-M3/5B 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, efficiency, and application-specific optimization.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power, bidirectional transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMB8J28CA-M3/5B at its rated peak pulse current?
The SMB8J28CA-M3/5B has a maximum clamping voltage (VC) of 45.4 V at its specified peak pulse current (IPPM) of 17.6 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures downstream components see no more than 45.4 V during surge events. The SMB8J28CA-M3/5B maintains this clamping performance across its full operating temperature range when mounted per recommended pad layout.
Is SMB8J28CA-M3/5B suitable for automotive applications?
Yes, SMB8J28CA-M3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its halogen-free (M3) construction, MSL Level 1 reflow compatibility, and guaranteed operation from –55 °C to +150 °C make SMB8J28CA-M3/5B appropriate for under-hood and cabin-mounted systems subject to rigorous environmental stress testing.
Does SMB8J28CA-M3/5B have polarity markings?
No, SMB8J28CA-M3/5B is a bidirectional TVS diode and carries no polarity marking - both terminals are functionally identical. Unlike unidirectional variants (e.g., SMB8J28A), it lacks a cathode band and may be installed in either orientation across the protected line and reference plane. This simplifies assembly and eliminates orientation-related assembly errors in automated placement.
What is the reverse leakage current of SMB8J28CA-M3/5B at its stand-off voltage?
At its 28 V stand-off voltage (VWM), SMB8J28CA-M3/5B exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance circuits such as sensor bias networks or analog front-ends, and remains stable across temperature - critical for precision measurement systems where leakage-induced offset must be minimized. The SMB8J28CA-M3/5B achieves this while maintaining full 800 W surge capability.
How does the SMB package of SMB8J28CA-M3/5B compare to SMA in thermal performance?
The SMB (DO-214AA) package of SMB8J28CA-M3/5B offers lower thermal resistance than SMA: typical RθJA is 72 °C/W versus ~100–120 °C/W for SMA variants under identical mounting conditions. This allows SMB8J28CA-M3/5B to sustain higher average power dissipation or operate at higher ambient temperatures without exceeding its 150 °C junction limit. The SMB8J28CA-M3/5B also features tighter dimensional control and better suitability for fine-pitch automated placement.
SMB8J28CA-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 17.6A
- Power - Peak Pulse:
- 800W
- 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 (SMBJ)
SMB8J28CA-M3/5B FAQ
1.How can I place an order for SMB8J28CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CA-M3/5B 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 SMB8J28CA-M3/5B reliable?
The price and inventory of SMB8J28CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J28CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J28CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CA-M3/5B?
SMB8J28CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CA-M3/5B 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 SMB8J28CA-M3/5B?
For technical support, including SMB8J28CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CA-M3/5B requirements.
6.How does Aetrix verify that SMB8J28CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J28CA-M3/5B 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 SMB8J28CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J28CA-M3/5B?
All SMB8J28CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CA-M3/5B, 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 SMB8J28CA-M3/5B part is unused and in its original packaging.
Return procedure for SMB8J28CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CA-M3/5B Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
