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Vishay General Semiconductor - Diodes Division SMBJ28C-E3/5B
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- Part No.:
- SMBJ28C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28C-E3/5B.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,423
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Product details
Overview
SMBJ28C-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 13.2 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and I/O lines of industrial sensor interfaces and automotive control modules.
For engineers reviewing the SMBJ28C-E3/5B datasheet, SMBJ28C-E3/5B pinout, SMBJ28C-E3/5B application, or SMBJ28C-E3/5B equivalent, key selection criteria include clamping performance under 13.2 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, 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: when reverse voltage exceeds VWM = 28 V, it avalanches into low-impedance conduction to divert transient energy away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMB package supports high surge current handling without thermal runaway under repetitive 0.01% duty cycle conditions.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and exhibits 0.098 %/°C temperature coefficient of VBR. It is not AEC-Q101 qualified (suffix lacks HE3/HM3), and its unidirectional configuration requires cathode-band orientation during PCB layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse working voltage before clamping begins; sets protection threshold for 24 V nominal systems. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown range ensures reliable triggering above system overvoltage margin. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamping voltage limits stress on protected ICs during 10/1000 µs surge events. |
| PPPM | 600 W - Peak pulse power capability defines transient energy absorption capacity under standardized waveform. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance determines derating requirements above 25 °C ambient. |
| IFSM | 100 A - Non-repetitive forward surge rating supports robustness against accidental polarity reversal or inrush. |
| Junction Temp | -55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band on one end; anode is opposite terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 24 V rail); conducts avalanche current to ground during overvoltage. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or common return path; completes shunt path for surge diversion. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V DC lines without external series impedance. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving clamping precision for 3.3 V/5 V logic interface protection. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage current (<1 µA at VWM) across temperature and lifetime. |
| MSL Level 1 rating | Supports standard lead-free reflow profiles up to 260 °C peak without popcorn cracking or delamination. |
| Automated placement compatible | Standardized SMB footprint and lead geometry enable high-yield pick-and-place assembly at >30,000 UPH. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog front-end inputs of pressure/temperature sensors exposed to load-dump transients in factory automation PLCs. IC Role / Device Role: Shunt clamping element placed between sensor signal line and ground, triggered only during overvoltage events. Use Value: Limits input voltage to ≤45.4 V during 13.2 A surge, preventing damage to 24 V-tolerant ADCs and op-amps without affecting normal 0–10 V signal range. |
Use Scenario: Safeguarding LIN bus transceiver power pins against battery line transients during ignition switch cycling. IC Role / Device Role: Unidirectional TVS connected between VCC and GND, absorbing positive-going spikes from alternator load dump. Use Value: Clamps 28 V rail to 45.4 V within nanoseconds, maintaining transceiver functionality during 100 V/50 ms load-dump pulses per ISO 7637-2. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
|
Use Scenario: Secondary-side DC input protection for PoE-powered Ethernet switches subjected to lightning-induced surges on 48 V supply lines. IC Role / Device Role: Primary overvoltage clamp on 48 V DC-DC converter input, coordinated with upstream fuse and common-mode choke. Use Value: Absorbs 600 W transient energy without failure, preserving converter ICs and enabling compliance with IEC 61000-4-5 Class B immunity testing. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home vacuum cleaners and robotic mowers. IC Role / Device Role: Unidirectional TVS across motor terminals, conducting flyback current during PWM turn-off transitions. Use Value: Limits voltage reversal to ≤45.4 V, preventing gate oxide breakdown in H-bridge MOSFETs rated for 60 V drain-source breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A-E3/5B | Same VWM, VBR, VC, and package; identical electrical specs per Vishay datasheet Table 1. | No functional difference; "A" suffix denotes same unidirectional variant as "28C" - "C" is legacy marking variant per Vishay ordering matrix. | Select SMBJ28A-E3/5B if preferred in distributor inventory; electrically and mechanically interchangeable with SMBJ28C-E3/5B. |
| SMCJ28A-E3/57T | Higher 1500 W PPPM, larger SMC (DO-214AB) package, 100 A IPPM, same VWM/VC but 2× footprint area. | Used where higher surge margin is required (e.g., outdoor AC/DC adapters), but incompatible with SMB land pattern. | Choose only if board redesign accommodates SMC pad layout and thermal mass; not a drop-in replacement. |
Compared with SMBJ28A-E3/5B, SMBJ28C-E3/5B offers identical protection performance in the same SMB footprint; versus SMCJ28A-E3/57T, it trades surge capacity for space-constrained designs where 600 W suffices and PCB real estate is limited.
Availability
SMBJ28C-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom power supply inputs requiring stable component supply, RoHS-compliant sourcing, and consistent tape-and-reel delivery for SMT production.
Supply support for SMBJ28C-E3/5B 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, power efficiency, and AEC-Q qualification.
The SMBJ series targets cost-sensitive, high-volume transient protection in consumer, industrial, and automotive electronics - optimized for automated assembly, thermal robustness, and repeatable clamping performance across temperature.
FAQ
What is the clamping voltage of SMBJ28C-E3/5B at its rated peak pulse current?
The SMBJ28C-E3/5B has a maximum clamping voltage (VC) of 45.4 V at 13.2 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay Document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ28C-E3/5B maintains this clamping performance across its full operating temperature range when mounted per recommended pad layout.
Is SMBJ28C-E3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ28C-E3/5B is not AEC-Q101 qualified. Its suffix "E3" indicates RoHS-compliant commercial grade only; AEC-Q101 variants use "HE3" or "HM3" suffixes (e.g., SMBJ28AHE3_B). The SMBJ28C-E3/5B lacks the extended temperature cycling, humidity testing, and failure analysis required for automotive qualification. For automotive use, specify SMBJ28AHE3_B or equivalent AEC-Q101 part instead of SMBJ28C-E3/5B.
How does the SMBJ28C-E3/5B differ from bidirectional variants like SMBJ28CA?
The SMBJ28C-E3/5B is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse voltage is blocked. In contrast, SMBJ28CA is bidirectional, symmetric in both directions, and used for AC signal lines or differential buses. Their VWM and VC values differ: SMBJ28C-E3/5B has VWM = 28 V and VC = 45.4 V, while SMBJ28CA has VWM = 28 V but clamps in both polarities - making SMBJ28C-E3/5B unsuitable as a direct substitute in AC-coupled circuits.
What is the thermal resistance and maximum power dissipation of SMBJ28C-E3/5B?
The SMBJ28C-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per Vishay's test condition. Its steady-state power dissipation (PD) is rated at 5.0 W at TA = 50 °C. Derating is required above 50 °C ambient, following the curve in Figure 2 of Document 88392. These values define safe continuous operation limits - the SMBJ28C-E3/5B is not intended for sustained power dissipation but for transient suppression.
Can SMBJ28C-E3/5B be used in place of SMBJ28A-E3/5B?
Yes, SMBJ28C-E3/5B and SMBJ28A-E3/5B are functionally identical: same VWM (28 V), VBR (31.1–34.4 V), VC (45.4 V), PPPM (600 W), package (SMB), and RoHS compliance. The "C" suffix reflects an older Vishay marking convention for the same unidirectional device; both are listed in the same datasheet table and share identical electrical characteristics. SMBJ28C-E3/5B may be substituted for SMBJ28A-E3/5B without design change.
SMBJ28C-E3/5B 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 12A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ28C-E3/5B FAQ
1.How can I place an order for SMBJ28C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28C-E3/5B 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 SMBJ28C-E3/5B reliable?
The price and inventory of SMBJ28C-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ28C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28C-E3/5B?
SMBJ28C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28C-E3/5B 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 SMBJ28C-E3/5B?
For technical support, including SMBJ28C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28C-E3/5B requirements.
6.How does Aetrix verify that SMBJ28C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ28C-E3/5B 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 SMBJ28C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ28C-E3/5B?
All SMBJ28C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28C-E3/5B, 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 SMBJ28C-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ28C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28C-E3/5B Tags
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