My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ28CAH
- Part No.:
- SMBJ28CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CAH.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,360
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ28CAH 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), 31.1–34.4 V breakdown voltage (VBR), 45.4 V maximum clamping voltage (VC) at 13.8 A peak pulse current (IPP), and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ28CAH datasheet, SMBJ28CAH pinout, SMBJ28CAH application, or SMBJ28CAH equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, and low leakage (<1 µA at 28 V) for battery-sensitive systems.
Technical Context
The SMBJ28CAH operates as a silicon avalanche diode with glass-passivated junction, enabling fast, repeatable clamping during transient events. Its bidirectional configuration supports symmetric voltage suppression across both polarities without external polarity management, making it suitable for AC-coupled or floating signal lines.
Thermal performance is defined by RθJC = 10 °C/W and RθJA = 55 °C/W, supporting continuous operation up to +150 °C junction temperature. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, ensuring robustness in automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 31.1 / 34.4 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPP | 45.4 V at 13.8 A - Clamped voltage seen by protected circuit during 10/1000 µs surge |
| PPK | 600 W - Peak transient energy absorption capacity per single pulse |
| IR @ VWM | <1 µA - Negligible leakage current at rated stand-off voltage, critical for low-power standby circuits |
| TJ max | +150 °C - Maximum allowable junction temperature, enabling under-hood automotive use |
| Response time | <1.0 ps - Enables suppression of nanosecond-scale ESD events before downstream IC damage |
Pinout & Package
DO-214AA (SMB) surface-mount package with matte tin-plated leads; cathode band marking indicates polarity for unidirectional variants only - SMBJ28CAH is bidirectional and symmetric, with no functional polarity distinction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | Either terminal accepts positive or negative transients; no PCB orientation dependency |
| Case (cathode band absent) | Non-functional marking | No polarity marking required; device functions identically regardless of board placement orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per AEC standard |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly without dry-pack handling |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V vehicle power distribution networks from load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤45.4 V during 13.8 A surges, preventing latch-up or gate oxide rupture in downstream PMICs. | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) from EFT and contact ESD in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential or single-ended signal lines. Use Value: Sub-1 ps response ensures clamping occurs before 15 kV ESD pulses propagate into precision ADC front-ends. |
| LED Driver Overvoltage Suppression | RS-485 Transceiver Bus Protection |
Use Scenario: Safeguarding constant-current LED drivers against inductive kickback from relay-controlled loads. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output terminals. Use Value: 600 W peak power rating absorbs repetitive 10/1000 µs switching surges without degradation. | Use Scenario: Protecting full-duplex RS-485 transceivers (e.g., THVD1550) on long cable runs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode TVS on A/B bus lines referenced to ground. Use Value: Symmetric clamping maintains signal integrity while limiting common-mode transients to <45.4 V peak. |
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; 45.4 V VC @ 13.8 A; slightly higher RθJA (65 °C/W) | Lower power density due to smaller package; derates faster above 75 °C ambient | Select when footprint compatibility with SMA-landed designs is required and thermal margin permits |
| ON Semiconductor 1.5SMC28CA | DO-214AB (SMC) package; 45.4 V VC @ 13.8 A; higher PPK (1500 W); larger footprint | Higher surge capacity but requires 30% more PCB area; not drop-in compatible | Choose for legacy SMC-based designs needing >600 W headroom or extended thermal mass |
Compared with SMBJ28CAH, SMAJ28CA offers identical electrical specs but reduced thermal performance in a smaller package, while 1.5SMC28CA trades compactness for higher surge endurance and larger layout footprint - SMBJ28CAH balances AEC-Q101 compliance, SMB footprint efficiency, and automotive-grade thermal robustness.
Availability
SMBJ28CAH is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor interface protection, and LED lighting surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBJ28CAH 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 validation capabilities.
The SMBJH series was developed specifically for automotive and industrial transient protection, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust SMT manufacturability in the DO-214AA package.
FAQ
What does the 'CAH' suffix indicate in SMBJ28CAH?
The 'CAH' suffix denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional 'H' variants, SMBJ28CAH provides symmetrical clamping for both positive and negative transients without polarity constraints, and complies with IEC 61249-2-21 for halogen content.
Is SMBJ28CAH suitable for ISO 7637-2 Pulse 5a (load dump) protection?
No - SMBJ28CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b only. Pulse 5a (load dump) requires higher energy handling (≥1000 W) and specialized TVS or suppressor modules; SMBJ28CAH's 600 W PPK is insufficient for sustained load dump events.
What is the maximum clamping voltage of SMBJ28CAH under standardized surge conditions?
The maximum clamping voltage of SMBJ28CAH is 45.4 V, measured at 13.8 A peak pulse current using the 10/1000 µs waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range (−55 °C to +150 °C) and defines the upper voltage limit imposed on protected circuitry during surge events.
Does SMBJ28CAH require special PCB layout considerations for thermal management?
Yes - although SMBJ28CAH has RθJA = 55 °C/W, optimal thermal performance requires ≥25 mm² of 1 oz copper pour connected to both terminals. Avoid narrow traces or isolated pads; use thermal vias under the body if ambient exceeds 85 °C to maintain TJ ≤150 °C during repetitive surges.
How does SMBJ28CAH differ from SMBJ28AH in functionality and application?
SMBJ28AH is unidirectional with cathode marking and forward voltage drop (~3.5 V), while SMBJ28CAH is bidirectional with no polarity marking and symmetric clamping. SMBJ28CAH is used where AC signals or floating buses require protection in both directions; SMBJ28AH suits DC rails with defined polarity and where forward conduction must be blocked.
SMBJ28CAH 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:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 13.8A
- 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)
SMBJ28CAH FAQ
1.How can I place an order for SMBJ28CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CAH 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 SMBJ28CAH reliable?
The price and inventory of SMBJ28CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28CAH is usually 5 days.
3.What payment methods are accepted for SMBJ28CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CAH?
SMBJ28CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CAH 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 SMBJ28CAH?
For technical support, including SMBJ28CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CAH requirements.
6.How does Aetrix verify that SMBJ28CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ28CAH 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 SMBJ28CAH meets industry standards.
7.What is the process for return or replacement of SMBJ28CAH?
All SMBJ28CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CAH, 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 SMBJ28CAH part is unused and in its original packaging.
Return procedure for SMBJ28CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CAH 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…
