My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ28H
- Part No.:
- SMCJ28H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28H.pdf
- Description:
- 1500W, 34.6V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:3,767
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ28H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 28V working stand-off voltage (VWM), 31.1–38.0V breakdown voltage (VBR), and 50.0V maximum clamping voltage (VC) at 31A peak pulse current. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection.
For engineers reviewing the SMCJ28H datasheet, SMCJ28H pinout, SMCJ28H application, or SMCJ28H equivalent, this page delivers verified electrical parameters, thermal performance data, automotive-grade compliance evidence, clamping behavior under 10/1000μs surge, and direct alternatives for board-level transient suppression in power supply rails and signal lines.
Technical Context
The SMCJ28H employs a glass-passivated silicon junction optimized for fast response (<1.0 ps rise time from 0 V to VBR min) and low leakage (<1 μA at 28 V). Its unidirectional configuration provides reverse-biased clamping only, with forward voltage of 3.5 V at 100 A - consistent with SMCJ5.0H–SMCJ90H series devices.
Thermally, it features 10°C/W junction-to-case (RθJC) and 55°C/W junction-to-ambient (RθJA) resistance, enabling reliable operation up to TJ = +150°C. It is rated for 200 A non-repetitive forward surge (IFSM, 8.3 ms half-sine) and supports automated placement per J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 31.1 V / 38.0 V @ 1 mA - ensures predictable turn-on across manufacturing lot and temperature |
| VC @ IPPM | 50.0 V @ 31 A (10/1000 μs waveform) - defines worst-case voltage seen by protected IC during surge |
| PPK | 1500 W - peak pulse power handling capacity under standardized transient conditions |
| IR @ VWM | <1 μA - minimal leakage current preserves signal integrity and battery life in always-on circuits |
| TJ max | +150 °C - enables use in under-hood automotive environments and high-power industrial enclosures |
| RθJC | 10 °C/W - supports efficient heat transfer to PCB copper when mounted with adequate thermal pad |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-diode unidirectional configuration. Cathode indicated by molded band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side (e.g., GND or return rail); conducts during forward surge events |
| Cathode | Clamping node | Connected to protected line (e.g., 24 V rail); clamps transients above VBR by shunting current to anode/GND |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and body modules requiring zero-failure reliability |
| ISO 7637-2 compliance | Guarantees robustness against real-world vehicle electrical disturbances: load dump (Pulse 5a), alternator switching (Pulse 2b), and ESD (Pulse 3b) |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives, critical for humid or under-hood environments |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream logic or analog circuitry can be damaged |
| Moisture sensitivity level 1 | Eliminates need for dry-pack or baking prior to reflow, reducing manufacturing cost and process complexity |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against load dump surges up to ±120 V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 24 V rail and chassis ground to clamp reverse-polarity and overvoltage transients. Use Value: Limits clamped voltage to ≤50.0 V during 31 A surge, ensuring downstream DC-DC converters and microcontrollers remain within absolute maximum ratings. | Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across input terminals to absorb repetitive 10/1000 μs transients induced by switching inductive loads. Use Value: With <1 μA leakage at 28 V, it avoids false triggering of 24 V digital inputs while maintaining fast clamping response to >1 kV spikes. |
| Telecom DC Power Feeds | Medical Equipment Auxiliary Supplies |
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges entering via long cable runs. IC Role / Device Role / Timing Role: Reverse-connected SMCJ28H (cathode to -48 V, anode to ground) clamps positive-going transients on negative rails. Use Value: 50.0 V clamping voltage referenced to ground ensures protected DC-DC isolators see no more than 48 V + 50 V = 98 V peak stress. | Use Scenario: Shielding auxiliary 24 V power supplies in diagnostic imaging systems from ESD events during service access or cable coupling. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side 24 V distribution bus, upstream of LDO regulators feeding FPGA and ADC subsystems. Use Value: AEC-Q101 qualification and halogen-free construction meet IEC 60601-1 safety and environmental requirements for Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A | 600 W peak power rating, SMB package (smaller footprint), bidirectional variant available | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select when space-constrained and surge energy is limited to <600 W (e.g., USB or sensor interfaces) |
| TPSMD28 | 1500 W rating, same DO-214AB package, but higher clamping voltage (53.3 V @ 31 A) and no AEC-Q101 certification | Not qualified for automotive use; requires additional validation for harsh-environment deployment | Choose for cost-sensitive industrial applications where AEC-Q101 is not mandated |
Compared with SMBJ28A and TPSMD28, the SMCJ28H uniquely combines 1500 W surge capability, AEC-Q101 qualification, and 50.0 V clamping in DO-214AB - making it the only option among the three validated for automotive load-dump immunity without derating or parallel staging.
Availability
SMCJ28H is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power feeds, and medical auxiliary supplies requiring stable component supply across extended production lifecycles.
Supply support for SMCJ28H 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 automotive and industrial certifications.
The SMCJ series was designed specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and robust thermal performance in surface-mount packages.
FAQ
What is the clamping voltage of SMCJ28H and how is it measured?
The SMCJ28H has a maximum clamping voltage (VC) of 50.0 V, measured at 31 A peak pulse current using the standardized 10/1000 μs double-exponential waveform per Fig.5 in the datasheet. This value represents the worst-case voltage imposed on protected circuitry during a surge event and is guaranteed across temperature and production lots.
Is SMCJ28H suitable for bidirectional transient protection?
No, SMCJ28H is a unidirectional TVS diode intended for reverse-biased clamping only. For bidirectional protection, select the SMCJ28AH variant (marking code GFG), which provides symmetrical clamping in both polarities and is specified with identical VWM, VBR, and VC ratings in either direction.
Does SMCJ28H require derating at elevated ambient temperatures?
Yes, SMCJ28H must be derated above TA = 25°C per Fig.2 in the datasheet. At 85°C ambient, its 1500 W peak pulse power rating drops to approximately 900 W, and at 125°C, it falls to ~500 W. Thermal design must account for RθJA = 55°C/W and ensure junction temperature remains ≤150°C under worst-case surge duty cycles.
What is the forward voltage of SMCJ28H and why does it matter?
The forward voltage (VF) of SMCJ28H is 3.5 V at 100 A (8.3 ms half-sine surge), consistent with all SMCJ5.0H–SMCJ90H unidirectional devices. This parameter matters for forward-conducting surge events (e.g., reverse-polarity connection), where VF determines power dissipation and potential thermal stress during sustained overcurrent.
How does SMCJ28H compare to SMCJ28AH in terms of electrical performance?
SMCJ28H (GFF) has VBR = 31.1–38.0 V and VC = 50.0 V @ 31 A, while SMCJ28AH (GFG) has tighter VBR = 31.1–34.4 V and lower VC = 45.4 V @ 34 A. The AH version offers improved clamping efficiency and symmetric bipolar operation but shares the same package, thermal specs, and AEC-Q101 qualification as SMCJ28H.
SMCJ28H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 31A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ28H FAQ
1.How can I place an order for SMCJ28H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28H 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 SMCJ28H reliable?
The price and inventory of SMCJ28H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28H is usually 5 days.
3.What payment methods are accepted for SMCJ28H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28H?
SMCJ28H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28H 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 SMCJ28H?
For technical support, including SMCJ28H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28H requirements.
6.How does Aetrix verify that SMCJ28H is sourced from the original manufacturer or authorized distributors?
All SMCJ28H 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 SMCJ28H meets industry standards.
7.What is the process for return or replacement of SMCJ28H?
All SMCJ28H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28H, 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 SMCJ28H part is unused and in its original packaging.
Return procedure for SMCJ28H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28H 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
