My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ28CA-61HM3J/H
- Part No.:
- SMAJ28CA-61HM3J/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28CA-61HM3J/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,368
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ28CA-61HM3J/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. 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 8.8 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), suitable for automotive-grade ESD and surge protection in sensor interfaces and power rails.
For engineers reviewing the SMAJ28CA-61HM3J/H datasheet, SMAJ28CA-61HM3J/H pinout, SMAJ28CA-61HM3J/H application, or SMAJ28CA-61HM3J/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance (HM3 suffix), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its CA (bidirectional) configuration, enabling suppression of positive and negative transients without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports rapid energy dissipation during 8.3 ms half-sine or 10/1000 μs surges.
The device is rated for continuous power dissipation of 3.3 W at TA = 50 °C, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring minimal PCB copper area for thermal management. It meets UL 497B recognition (QVGQ2) and is qualified per AEC-Q101 for automotive underhood and infotainment applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum reverse working voltage before clamping begins; defines safe operating range for normal circuit operation. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown threshold ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 45.4 V at 8.8 A - Clamped voltage seen by protected IC/MOSFET during 10/1000 μs surge; limits stress on downstream components. |
| PPPM | 400 W (≤78 V) - Peak transient energy handling capacity using standard 10/1000 μs waveform; validates robustness against IEC 61000-4-5 surges. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature enabling reliable operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" length and 0.177" width; compatible with JEDEC MS-013 and automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1, UL 94 V-0 rated compound. Bidirectional construction means no polarity marking; terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides low-impedance conduction path for negative-going surges; electrically identical to cathode in CA devices. |
| Cathode | Transient return path (bidirectional) | Provides low-impedance conduction path for positive-going surges; functionally interchangeable with anode in CA configuration. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per JESD22 standards. |
| Halogen-free & RoHS-compliant (HM3) | Meets IEC 61249-2-21 and JEDEC J-STD-020; eliminates brominated flame retardants without compromising UL 94 V-0 rating. |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out with 0.2" × 0.2" copper pads. |
| Fast response time & low clamping ratio | Clamps within picoseconds; VC/VBR ratio of ~1.45 ensures minimal overvoltage overshoot during fast transients. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow soldering without baking or special handling prior to assembly. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across differential bus lines or between signal line and ground. Use Value: Limits transient voltage to ≤45.4 V during 10/1000 μs surges, preventing damage to 3.3 V/5 V transceivers and preserving signal fidelity. | Use Scenario: Guarding RS-485/CAN FD physical layer transceivers against ESD (IEC 61000-4-2 ±25 kV air) and lightning-induced surges in factory automation systems. IC Role / Device Role / Timing Role: Primary front-end TVS on bus lines (CAN_H/CAN_L), mounted directly at connector entry point. Use Value: Absorbs up to 400 W of surge energy without degradation, maintaining bus uptime and avoiding false triggering in noise-prone environments. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feed Protection |
Use Scenario: Safeguarding AC-DC adapter primary-side rectifiers and secondary-side DC outputs against induced surges from nearby switching loads or grid anomalies. IC Role / Device Role / Timing Role: Secondary-side TVS across +VOUT and GND to clamp output overvoltage before reaching connected devices. Use Value: Prevents >28 V from reaching USB-PD or legacy 5 V/12 V peripherals, meeting UL 62368-1 transient immunity requirements. | Use Scenario: Protecting PoE (Power over Ethernet) injectors and splitters from longitudinal surges entering via Ethernet cabling in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Common-mode TVS across PSE output pairs (e.g., pair 1–2 and pair 3–6) referenced to chassis ground. Use Value: Withstands repetitive 10/1000 μs surges up to 400 W, extending service life of magnetics and DC-DC converters in harsh outdoor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CAHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3); no AEC-Q101 qualification. | Restricted to commercial-grade applications; unsuitable for automotive or halogen-free BOM mandates. | Select when cost sensitivity outweighs halogen-free or automotive qualification requirements. |
| SMBJ28CA-61HM3 | Higher 600 W PPPM rating; larger SMB (DO-214AA) package; same VWM/VBR/VC specs; also AEC-Q101 and HM3 qualified. | Better surge margin for high-energy threats; requires larger PCB footprint and different pad layout. | Choose when system-level surge testing exceeds 400 W or when design allows SMB footprint. |
Compared with SMAJ28CA-61HM3J/H, SMAJ28CAHE3_A/H lacks halogen-free and automotive qualification, limiting deployment scope, while SMBJ28CA-61HM3 offers higher surge robustness at the cost of board space-making SMAJ28CA-61HM3J/H the optimal balance of AEC-Q101 compliance, halogen-free materials, and compact SMA footprint for space-constrained automotive modules.
Availability
SMAJ28CA-61HM3J/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, consumer power adapters, and telecom PoE equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ28CA-61HM3J/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and communications systems-delivering consistent clamping performance, AEC-Q101 validation, and robust SMT manufacturability in the industry-standard SMA package.
FAQ
What does the "CA" suffix indicate in SMAJ28CA-61HM3J/H?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ28CA-61HM3J/H provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants, it has no polarity marking and functions identically across both terminals-ideal for AC-coupled lines, differential buses like CAN, or any application where surge polarity is unpredictable. This is confirmed in Vishay's datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS".
Is SMAJ28CA-61HM3J/H qualified for automotive use?
Yes, SMAJ28CA-61HM3J/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and verified in Vishay's ordering information table (page 3). It undergoes rigorous stress testing-including temperature cycling, high-temperature operating life, and mechanical shock-to ensure reliability in automotive under-hood and cabin environments. The "HM3" designation confirms halogen-free, RoHS-compliant, and AEC-Q101-qualified status per Vishay's material categorization guidelines.
What is the maximum clamping voltage of SMAJ28CA-61HM3J/H and under what test condition?
The maximum clamping voltage (VC) of SMAJ28CA-61HM3J/H is 45.4 V, measured at a peak pulse current (IPPM) of 8.8 A using the standardized 10/1000 μs double-exponential waveform. This value is specified in the "ELECTRICAL CHARACTERISTICS" table (page 2) and represents the worst-case voltage imposed on protected circuitry during a surge event-critical for ensuring downstream ICs rated for ≤50 V absolute maximum survive transient exposure.
How does the "HM3" suffix differ from "E3" or "HE3" in SMAJ28CA-61HM3J/H?
The "HM3" suffix in SMAJ28CA-61HM3J/H indicates halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. In contrast, "E3" is RoHS-compliant but not halogen-free or automotive-qualified; "HE3" adds AEC-Q101 qualification but retains brominated flame retardants. Only "HM3" satisfies all three requirements-making SMAJ28CA-61HM3J/H compliant with strict automotive and green electronics mandates such as JIS C 0950 and EU RoHS Annex II.
Can SMAJ28CA-61HM3J/H be used in place of SMAJ28A-61HM3J/H?
No-SMAJ28CA-61HM3J/H is bidirectional, while SMAJ28A-61HM3J/H is unidirectional and features a cathode band marking. Substituting them without circuit review risks failure: the unidirectional part blocks reverse current and cannot suppress negative transients, whereas the CA version clamps both polarities. Their VBR, VC, and PPPM values are nearly identical, but polarity dependence makes them functionally incompatible unless the application explicitly requires bidirectional protection and omits polarity-sensitive components.
SMAJ28CA-61HM3J/H 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ28CA-61HM3J/H FAQ
1.How can I place an order for SMAJ28CA-61HM3J/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28CA-61HM3J/H 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 SMAJ28CA-61HM3J/H reliable?
The price and inventory of SMAJ28CA-61HM3J/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28CA-61HM3J/H is usually 5 days.
3.What payment methods are accepted for SMAJ28CA-61HM3J/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28CA-61HM3J/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28CA-61HM3J/H?
SMAJ28CA-61HM3J/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28CA-61HM3J/H 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 SMAJ28CA-61HM3J/H?
For technical support, including SMAJ28CA-61HM3J/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28CA-61HM3J/H requirements.
6.How does Aetrix verify that SMAJ28CA-61HM3J/H is sourced from the original manufacturer or authorized distributors?
All SMAJ28CA-61HM3J/H 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 SMAJ28CA-61HM3J/H meets industry standards.
7.What is the process for return or replacement of SMAJ28CA-61HM3J/H?
All SMAJ28CA-61HM3J/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28CA-61HM3J/H, 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 SMAJ28CA-61HM3J/H part is unused and in its original packaging.
Return procedure for SMAJ28CA-61HM3J/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ28CA-61HM3J/H 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
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 …
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…
