My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ28CAHE3/61
- Part No.:
- SMAJ28CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28CAHE3/61.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,051
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ28CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 28 V standoff voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 8.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ28CAHE3/61 datasheet, SMAJ28CAHE3/61 pinout, SMAJ28CAHE3/61 application, or SMAJ28CAHE3/61 equivalent, this AEC-Q101 qualified, RoHS-compliant bidirectional TVS delivers verified clamping performance, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and load-switching transient suppression.
Technical Context
The SMAJ28CAHE3/61 operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>100 MΩ at 28 V), but triggers into low-impedance conduction when transients exceed its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and fast response time (<1 ns), enabling effective suppression of ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and inductive switching spikes.
Thermally, it sustains 150 °C max junction temperature with RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, supporting repetitive surge duty cycles up to 0.01% at 400 W (derated to 300 W above 78 V). Its bidirectional symmetry ensures identical clamping behavior in both polarities - essential for AC-coupled or floating signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe working margin below clamping onset. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown range ensuring reliable triggering without premature conduction. |
| VC @ IPPM | 45.4 V at 8.8 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected IC inputs. |
| PPPM | 400 W - Peak pulse power handling capability; supports single-event surges up to 8.8 A without failure. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush or fault currents. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial ambient environments. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile package compatible with automated placement and reflow soldering per J-STD-020 MSL Level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One side of symmetrical PN junction; forms bidirectional conduction path with Cathode terminal. |
| Cathode | Terminal K | Other side of symmetrical PN junction; no band marking - device functionally identical in either orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients from relay coil de-energization or motor commutation without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic interfaces. |
| MSL Level 1, peak reflow ≤ 260 °C | Enables single-pass lead-free reflow assembly without moisture-induced popcorn failure. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage current across temperature and lifetime stress. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs of automotive body control modules (BCM) against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed directly at power entry point before DC/DC converter input. Use Value: Limits transient excursions to ≤45.4 V, preventing latch-up or permanent damage to downstream PMICs and microcontrollers. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional clamp across signal and return lines to suppress EFT bursts and cable discharge events. Use Value: Maintains signal integrity by clamping ±45.4 V transients while adding <1 pF junction capacitance - no bandwidth degradation. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 VBUS and D+/D− lines in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Low-capacitance TVS placed after primary common-mode choke to absorb contact/air discharge per IEC 61000-4-2 ±15 kV. Use Value: Responds in <1 ns to divert >8 A ESD current away from USB transceivers, preserving data integrity and pass/fail compliance. |
Use Scenario: Primary surge protection on twisted-pair DSL line interface cards exposed to lightning-induced surges per ITU-T K.20/21. IC Role / Device Role / Timing Role: Bidirectional shunt element across tip/ring pair, coordinated with gas discharge tube (GDT) front-end. Use Value: Clamps induced common-mode surges to <45.4 V differential, preventing damage to line driver/receiver ICs and maintaining ADSL2+ signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure projects). | Direct drop-in replacement if halogen-free bill-of-materials is required; same footprint, thermal, and electrical behavior. |
| SMBJ28CAHE3/61 | Same VWM/VBR/VC, but SMB (DO-214AA) package - 27% larger footprint, 600 W PPPM, higher IPPM (12.3 A). | Better suited for higher-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger package. | Select when surge energy exceeds 400 W capability or when thermal dissipation margin must be increased via larger pad area. |
Compared with SMAJ28CAHE3/61, SMAJ28CA-M3/61 offers identical protection performance with halogen-free construction, while SMBJ28CAHE3/61 trades compact size for +50% pulse power headroom and higher surge current tolerance - enabling design flexibility across cost, space, and ruggedness requirements.
Availability
SMAJ28CAHE3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer USB power delivery, and telecom line protection requiring stable component supply, AEC-Q101 traceability, and RoHS compliance.
Supply support for SMAJ28CAHE3/61 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, precision, and automotive-grade qualification.
The SMAJ series is engineered specifically for board-level transient suppression in harsh environments - delivering consistent clamping, low leakage, and AEC-Q101 validation for automotive, industrial, and telecom applications.
FAQ
What is the clamping voltage of SMAJ28CAHE3/61 at its rated peak pulse current?
The SMAJ28CAHE3/61 has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 8.8 A, measured with a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88390) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ28CAHE3/61 maintains this clamping performance across its full operating temperature range.
Is SMAJ28CAHE3/61 suitable for automotive applications?
Yes, SMAJ28CAHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use in Vishay's ordering nomenclature (suffix "HE3" denotes RoHS-compliant + AEC-Q101 qualification). It meets stringent requirements for temperature cycling, humidity resistance, and surge robustness - validated for deployment in engine control units, infotainment systems, and ADAS sensor modules. The SMAJ28CAHE3/61 data sheet confirms compliance per AEC-Q101 test conditions.
What does the "CA" suffix indicate in SMAJ28CAHE3/61?
The "CA" suffix in SMAJ28CAHE3/61 denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMAJ28A), the SMAJ28CAHE3/61 has no cathode marking and functions identically regardless of orientation on the PCB. Electrical characteristics including VBR, VC, and IPPM apply equally in both directions.
What is the maximum operating junction temperature for SMAJ28CAHE3/61?
The SMAJ28CAHE3/61 has a maximum junction temperature (TJ) rating of +150 °C, as specified in Vishay's official datasheet. This allows reliable operation in under-hood automotive environments and industrial enclosures where ambient temperatures exceed 105 °C. Derating curves in Figure 2 of the datasheet confirm sustained 400 W pulse capability down to TJ = 125 °C, with linear derating beyond that point. The SMAJ28CAHE3/61 thermal resistance values (RθJA = 120 °C/W, RθJL = 30 °C/W) support thermal design validation.
How does SMAJ28CAHE3/61 differ from SMAJ28AHE3/61?
SMAJ28CAHE3/61 is bidirectional, while SMAJ28AHE3/61 is unidirectional - resulting in different polarity marking (band on cathode for SMAJ28AHE3/61; no marking for SMAJ28CAHE3/61) and distinct forward voltage behavior. SMAJ28AHE3/61 exhibits VF = 3.5 V at IF = 25 A, whereas SMAJ28CAHE3/61 has no defined forward voltage due to symmetrical structure. Both share identical VWM, VBR, VC, and PPPM, but only SMAJ28CAHE3/61 protects AC-coupled or floating nodes without polarity constraints.
SMAJ28CAHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 8.8A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ28CAHE3/61 FAQ
1.How can I place an order for SMAJ28CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28CAHE3/61 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 SMAJ28CAHE3/61 reliable?
The price and inventory of SMAJ28CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ28CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28CAHE3/61?
SMAJ28CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28CAHE3/61 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 SMAJ28CAHE3/61?
For technical support, including SMAJ28CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ28CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ28CAHE3/61 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 SMAJ28CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ28CAHE3/61?
All SMAJ28CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28CAHE3/61, 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 SMAJ28CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ28CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ28CAHE3/61 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 …
