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Taiwan Semiconductor Corporation SMBJ28CH
- Part No.:
- SMBJ28CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CH.pdf
- Description:
- 600W, 34.6V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
SMBJ28CH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 28 V working stand-off voltage (VWM), 31.1–38.0 V breakdown voltage (VBR), 50.0 V maximum clamping voltage (VC) at 12.6 A peak pulse current, and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ28CH datasheet, SMBJ28CH pinout, SMBJ28CH application, or SMBJ28CH equivalent, key selection criteria include bidirectional polarity, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, moisture sensitivity level 1, and clamping performance under 10/1000 µs transients in 12 V and 24 V automotive subsystems.
Technical Context
The SMBJ28CH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional signal and power lines. Its unidirectional counterpart is SMBJ28H; the "CH" suffix explicitly denotes bidirectional configuration with symmetrical electrical characteristics in both polarities.
It operates across –55 °C to +150 °C junction temperature range, supports 1 µA max leakage at 28 V, and delivers 50.0 V clamping at 12.6 A (10/1000 µs), with thermal resistance RθJA = 55 °C/W and RθJC = 10 °C/W - enabling reliable operation in thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min / max | 31.1 V / 38.0 V @ 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPP | 50.0 V @ 12.6 A (10/1000 µs) - Clamped voltage seen by protected IC during worst-case surge |
| PPK | 600 W - Peak transient energy absorption capability per single non-repetitive event |
| ID @ VWM | ≤1 µA - Low leakage ensures minimal standby power loss in always-on circuits |
| Response time | <1.0 ps - Enables effective suppression of ESD events (IEC 61000-4-2) and fast transients |
| Standards | AEC-Q101 qualified, ISO 7637-2 compliant (Pulse 1/2a/2b/3a/3b), RoHS & halogen-free |
Pinout & Package
DO-214AA (SMB) surface-mount package: 2-terminal, bidirectional device with cathode band omitted (symmetrical marking); matte tin-plated leads, JEDEC-compliant footprint, 0.090 g weight, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (reversible) | Bidirectional terminal pair | No fixed polarity - either terminal serves as anode or cathode depending on transient polarity; enables placement without orientation check |
| Case (body) | Non-electrical mechanical interface | Thermally conductive but electrically isolated housing; requires no grounding pad or thermal via for standard operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood and chassis applications per stress test requirements (HTOL, TC, HAST, etc.) |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under humidity and thermal cycling |
| ISO 7637-2 compliance | Guarantees robustness against load dump, inductive switching, and battery disconnect transients in 12 V/24 V systems |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT assembly without dry-pack handling |
| Sub-1 ps response | Clamps ESD events before sensitive CMOS inputs reach damage threshold - critical for CAN, LIN, and sensor interfaces |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V supply lines in body control modules, lighting drivers, and infotainment head units from load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed upstream of DC-DC converters and LDOs to limit rail voltage excursion. Use Value: Limits peak rail voltage to ≤50.0 V during 10/1000 µs transients, preventing overvoltage shutdown or latch-up in downstream PMICs. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature, position) connected to microcontrollers in factory automation equipment. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector entry point to absorb ESD and cable discharge events. Use Value: Sub-1 ps response ensures clamping occurs before 15 kV HBM ESD pulses propagate into ADC input stages or op-amp front-ends. |
| LED Driver Transient Suppression | RS-485/Controller Area Network (CAN) Bus Protection |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback when driving solenoids or relays on shared PCBs. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to clamp flyback spikes before they exceed MOSFET VDS rating. Use Value: 600 W peak power rating absorbs repetitive 50–100 mJ inductive energy bursts without degradation over >10⁵ cycles. |
Use Scenario: Protecting CAN transceivers (e.g., TJA1042, SN65HVD230) from EFT and surge coupling on vehicle or industrial bus lines. IC Role / Device Role / Timing Role: Bidirectional TVS placed between CAN_H/CAN_L and ground to clamp differential and common-mode transients. Use Value: Symmetrical VBR and VC ensure balanced clamping on both bus lines - preserving signal integrity during ±25 kV ESD contact discharge. |
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 SMAJ28CA | Same DO-214AC (SMA) package; 28 V VWM, 50.0 V VC @ 12.6 A, but lower PPK = 400 W | Lower surge margin limits use to non-load-dump environments (e.g., consumer IoT, low-energy sensors) | Select when board space allows SMA footprint and system surge energy stays below 400 W peak. |
| ON Semiconductor 1.5SMC28CA | DO-214AB (SMC) package; 28 V VWM, 50.0 V VC @ 12.6 A, PPK = 1500 W, higher thermal mass | Larger footprint and 2× higher clamping energy tolerance suit heavy-duty industrial motor drives | Choose for high-reliability 48 V systems where layout permits larger SMC package and higher surge immunity is mandatory. |
Compared with SMBJ28CH, SMAJ28CA offers identical electrical clamping but reduced surge capacity and smaller package, while 1.5SMC28CA provides superior energy handling in a larger footprint - making SMBJ28CH the optimal balance of AEC-Q101 compliance, SMB footprint, and 600 W protection for mainstream automotive ECUs.
Availability
SMBJ28CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor nodes, and LED lighting systems requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 validation.
Supply support for SMBJ28CH 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, rectifiers, and MOSFETs, with global distribution and AEC-Q101-certified production lines.
The SMBJH series was developed specifically for automotive-grade transient suppression, emphasizing robustness under ISO 7637-2 pulses, low leakage, and high-temperature reliability in engine control and body electronics.
FAQ
What does the "CH" suffix indicate in SMBJ28CH?
The "CH" suffix in SMBJ28CH designates a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities without requiring orientation during placement. Unlike unidirectional variants (e.g., SMBJ28H), SMBJ28CH has no cathode band and exhibits identical VBR, VC, and IPP characteristics regardless of voltage polarity applied across its terminals.
Is SMBJ28CH qualified for automotive applications?
Yes, SMBJ28CH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - confirming its suitability for automotive power line protection in engine control units, body modules, and lighting systems. Its MSL Level 1 rating and –55 °C to +150 °C operating range further validate its use in under-hood and chassis environments.
What is the maximum clamping voltage of SMBJ28CH under surge conditions?
The maximum clamping voltage of SMBJ28CH is 50.0 V when subjected to a 10/1000 µs waveform with a peak pulse current of 12.6 A. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage seen by downstream circuitry during standardized surge events - critical for ensuring protected ICs remain within absolute maximum ratings.
How does SMBJ28CH differ from SMBJ28AH?
SMBJ28AH is a lower-breakdown variant with VBR = 31.1–34.4 V (vs. 31.1–38.0 V for SMBJ28CH) and slightly tighter VBR tolerance, resulting in earlier turn-on and marginally lower clamping (45.4 V vs. 50.0 V). Both are bidirectional and share identical package, power rating, and qualification - but SMBJ28AH suits designs needing more aggressive clamping at lower surge currents.
Can SMBJ28CH be used in place of a unidirectional TVS like SMBJ28H?
No - SMBJ28CH is strictly bidirectional and lacks polarity marking, whereas SMBJ28H is unidirectional with a defined cathode band. Substituting SMBJ28CH for SMBJ28H in DC-biased circuits may cause unintended conduction or failure to clamp correctly. Always verify circuit topology: use SMBJ28CH only where symmetrical AC or dual-rail transient protection is required.
SMBJ28CH 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 12.6A
- 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)
SMBJ28CH FAQ
1.How can I place an order for SMBJ28CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CH 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 SMBJ28CH reliable?
The price and inventory of SMBJ28CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28CH is usually 5 days.
3.What payment methods are accepted for SMBJ28CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CH?
SMBJ28CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CH 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 SMBJ28CH?
For technical support, including SMBJ28CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CH requirements.
6.How does Aetrix verify that SMBJ28CH is sourced from the original manufacturer or authorized distributors?
All SMBJ28CH 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 SMBJ28CH meets industry standards.
7.What is the process for return or replacement of SMBJ28CH?
All SMBJ28CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CH, 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 SMBJ28CH part is unused and in its original packaging.
Return procedure for SMBJ28CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CH Tags
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