My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ30C-4HM3_A/I
- Part No.:
- SMAJ30C-4HM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30C-4HM3_A/I.pdf
- Description:
- TVS DIODE 30VWM 53.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,519
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ30C-4HM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage (VC) at 8.3 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ30C-4HM3_A/I datasheet, SMAJ30C-4HM3_A/I pinout, SMAJ30C-4HM3_A/I application, or SMAJ30C-4HM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports fast energy diversion during ESD or lightning-induced surges.
The device is rated for repetitive 10/1000 μs transients at 0.01% duty cycle and derates linearly above 25 °C ambient per Fig. 2. With a maximum junction temperature of +150 °C and MSL Level 1 moisture sensitivity, it supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 33.3 V / 36.8 V - breakdown occurs within this range at 1.0 mA test current; ensures predictable turn-on under transient stress. |
| VC @ IPPM | 48.4 V - clamped voltage seen by protected circuit at 8.3 A peak pulse; limits downstream overvoltage exposure. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; sufficient for IEC 61000-4-5 Level 3 surge events. |
| ID @ VWM | <1.0 μA - ultra-low reverse leakage at standoff voltage; avoids signal distortion or power loss in high-impedance circuits. |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on standard PCB pad layout; informs derating requirements above 25 °C. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H). No polarity marking - bidirectional operation eliminates cathode/anode distinction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | Either end connects to line under protection; no orientation required during placement - simplifies layout and assembly. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 surge events up to 1 kV open-circuit voltage on 2 Ω source impedance. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics including engine control units, body modules, and ADAS sensor interfaces. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT processes without preconditioning or special handling requirements. |
| Glass-passivated junction | Ensures stable VBR over lifetime and improved resistance to humidity-induced parameter drift. |
| Low-profile SMA package | Reduces board space vs. SMB/SMC alternatives while maintaining thermal performance on 5 mm × 5 mm copper pads. |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across signal line and ground to limit transient voltage excursions. Use Value: Maintains signal integrity below 48.4 V during 8.3 A surges, preventing latch-up or damage to 3.3 V/5 V microcontrollers and ADC front-ends. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from inductive kickback and EFT bursts. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on each input channel, referenced to common ground plane. Use Value: Clamps transients within 1 ns response time while sustaining 400 W peak power - extends system uptime in factory automation environments. |
| Consumer Power Adapter Output Protection | Telecom Ethernet PHY Line Protection |
Use Scenario: Safeguarding USB-C PD and 12 V/19 V adapter outputs against accidental short-to-battery or hot-swap surges. IC Role / Device Role / Timing Role: Secondary-level TVS placed after DC-DC converter output filter to absorb residual transients. Use Value: Low 1.0 μA leakage preserves no-load efficiency; 30 V VWM aligns with 24 V rail margins without false triggering. |
Use Scenario: Protecting 10/100/1000BASE-T PHY transformer center taps and data lines from lightning-induced surges on outdoor Ethernet links. IC Role / Device Role / Timing Role: Bidirectional suppression across differential pairs and common-mode paths to meet IEEE 802.3 compliance. Use Value: Symmetric clamping ensures equal protection on both polarities - critical for full-duplex communication integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA-E3/61 | Same electrical specs (VWM = 30 V, VC = 48.4 V), but commercial-grade (non-AEC-Q101), RoHS-compliant only (not halogen-free). | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and halogen-free compliance is optional. |
| SMBJ30CA-HM3_A/I | Same VWM/VC ratings but in larger SMB (DO-214AA) package; higher PPPM (600 W), lower RθJA (80 °C/W). | Better thermal performance and surge margin, but occupies ~40% more PCB area than SMAJ30C-4HM3_A/I. | Choose when higher surge endurance is needed and board space allows SMB footprint. |
Compared with SMAJ30C-4HM3_A/I, the SMAJ30CA-E3/61 offers identical clamping performance at lower cost but lacks automotive qualification and halogen-free status, while the SMBJ30CA-HM3_A/I delivers superior thermal and surge capability at the expense of increased footprint - making SMAJ30C-4HM3_A/I optimal for space-constrained AEC-Q101 designs.
Availability
SMAJ30C-4HM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom Ethernet interface designs requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for SMAJ30C-4HM3_A/I 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, EFT, and surge events is mission-critical.
FAQ
What does the "C" in SMAJ30C-4HM3_A/I signify?
The "C" denotes bidirectional configuration - meaning SMAJ30C-4HM3_A/I provides symmetrical clamping in both forward and reverse directions, unlike unidirectional variants (e.g., SMAJ30A). This enables use on AC signals, differential buses, or polarity-agnostic protection points without concern for orientation during PCB layout or assembly.
Is SMAJ30C-4HM3_A/I qualified for automotive applications?
Yes - the "HM3" suffix confirms SMAJ30C-4HM3_A/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It has passed stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC-Q101 Rev D, making it suitable for under-hood and chassis-mounted automotive electronics.
What is the maximum clamping voltage of SMAJ30C-4HM3_A/I and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ30C-4HM3_A/I is 48.4 V, measured at 8.3 A peak pulse current (IPPM) using the standardized 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
How does the thermal resistance of SMAJ30C-4HM3_A/I affect its power handling?
SMAJ30C-4HM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on the recommended 5.0 mm × 5.0 mm copper pad layout. At 25 °C ambient, this limits continuous power dissipation to ~3.3 W; for transient events, derating curves (Fig. 2) must be applied to ensure junction temperature stays below 150 °C.
Can SMAJ30C-4HM3_A/I replace SMAJ30A in an existing design?
No - SMAJ30C-4HM3_A/I is bidirectional while SMAJ30A is unidirectional, so direct substitution requires verification of circuit polarity and grounding topology. SMAJ30C-4HM3_A/I lacks a cathode band marking and conducts equally in both directions, which may cause unintended conduction in DC-biased paths originally designed for unidirectional suppression.
SMAJ30C-4HM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- 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)
SMAJ30C-4HM3_A/I FAQ
1.How can I place an order for SMAJ30C-4HM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30C-4HM3_A/I 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 SMAJ30C-4HM3_A/I reliable?
The price and inventory of SMAJ30C-4HM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30C-4HM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ30C-4HM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30C-4HM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30C-4HM3_A/I?
SMAJ30C-4HM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30C-4HM3_A/I 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 SMAJ30C-4HM3_A/I?
For technical support, including SMAJ30C-4HM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30C-4HM3_A/I requirements.
6.How does Aetrix verify that SMAJ30C-4HM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ30C-4HM3_A/I 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 SMAJ30C-4HM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ30C-4HM3_A/I?
All SMAJ30C-4HM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30C-4HM3_A/I, 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 SMAJ30C-4HM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ30C-4HM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30C-4HM3_A/I 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 …
