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Vishay General Semiconductor - Diodes Division SMAJ48CA-E3/5A
- Part No.:
- SMAJ48CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CA-E3/5A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,375
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Product details
Overview
SMAJ48CA-E3/5A 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 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 77.4 V maximum clamping voltage (VC) at 5.2 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 SMAJ48CA-E3/5A datasheet, SMAJ48CA-E3/5A pinout, SMAJ48CA-E3/5A application, or SMAJ48CA-E3/5A equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification eligibility, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering identical electrical characteristics forward and reverse - critical for protecting AC-coupled or floating signal paths. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the low incremental surge resistance enables rapid energy diversion during ESD or lightning-induced transients.
The device is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with thermal resistance RθJA = 120 °C/W enabling operation up to +150 °C junction temperature. Polarity-unmarked construction confirms its bidirectional identity per DO-214AC mechanical standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on without premature conduction. |
| VC @ IPPM | 77.4 V at 5.2 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to ≤77.4 V under worst-case transient. |
| PPPM | 400 W - Peak pulse power handling capability on 5.0 mm × 5.0 mm copper pads; supports IEC 61000-4-5 Level 4 compliance. |
| IPPM | 5.2 A - Peak surge current corresponding to VC; determines minimum PCB trace width and layout robustness. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; informs derating requirements when mounted on standard FR-4 with minimal copper. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Either terminal accepts positive or negative transient; no cathode band marking required for SMAJ48CA-E3/5A. |
| Case (body) | Thermal and mechanical interface | DO-214AC molded body provides UL 94 V-0 flammability rating and solderable matte tin-plated leads per J-STD-002. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 4 kV surge events on 48 V supply rails without external series impedance. |
| Clamping ratio VC/VWM = 1.61 | Minimizes overvoltage overshoot during fast transients - critical for safeguarding 50 V-rated CAN transceivers and RS-485 drivers. |
| Low leakage <1.0 μA at VWM | Prevents measurable standby current increase in battery-powered sensor nodes and always-on automotive modules. |
| AEC-Q101 qualification option (HE3/HM3 suffix) | Supports automotive-grade sourcing via Vishay's qualified variant - essential for Tier-1 ECU BOMs requiring PPAP documentation. |
| MSL Level 1, 260 °C reflow compatible | Permits single-pass lead-free reflow without moisture sensitivity concerns - eliminates baking step in high-volume SMT lines. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 48 V battery-fed control modules (e.g., ADAS camera ECU) against load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across input power pins upstream of DC/DC converter. Use Value: Limits transient excursions to ≤77.4 V, preventing damage to 60 V-rated MOSFETs and PMICs without adding series resistance or delay. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loop) in factory-floor pressure sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting signal line to ground, positioned adjacent to connector. Use Value: Sub-100 ps response time clamps ±15 kV contact ESD per IEC 61000-4-2 before op-amp input stages saturate or latch. |
| Telecom DC Feeder Protection | Consumer USB-C Port Surge Suppression |
Use Scenario: Safeguarding PoE++ (IEEE 802.3bt) powered devices connected to 57 V DC feeder lines in enterprise switches. IC Role / Device Role / Timing Role: Bidirectional TVS on each DC pair (spare pairs or data pairs) to absorb induced surges from nearby lightning strikes. Use Value: Withstands 400 W pulses without degradation, maintaining integrity across >100,000 surge events per Telcordia GR-1089-CORE. |
Use Scenario: Adding secondary-level surge immunity to USB-C receptacles in portable monitors and docking stations exposed to user-handling ESD. IC Role / Device Role / Timing Role: Compact SMA footprint allows placement directly at connector, minimizing trace inductance before clamping. Use Value: 7500-unit tape-and-reel (5A packaging) supports high-mix SMT lines; RoHS-compliant matte tin terminations ensure solder joint reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CA-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No difference in circuit function or layout; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure). | Choose SMAJ48CA-M3/5A when environmental compliance requires halogen-free molding compound and terminations. |
| SMAJ48CAHE3_A/I | AEC-Q101 qualified version with same VWM, VBR, and VC; differs only in test certification and traceability documentation. | Required for automotive production programs needing PPAP, failure rate data, and extended temperature validation (-40 °C to +125 °C ambient). | Specify SMAJ48CAHE3_A/I for OEM automotive designs requiring AEC-Q101 qualification and full automotive traceability. |
Compared with SMAJ48CA-E3/5A, the M3 variant adds halogen-free compliance without performance trade-offs, while the HE3 variant delivers automotive-grade validation - neither offers pin-to-pin or functional substitution without explicit qualification in the target application.
Availability
SMAJ48CA-E3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor guarding, telecom DC feeder protection, and consumer USB-C port surge suppression requiring stable component supply and consistent RoHS-compliant manufacturing.
Supply support for SMAJ48CA-E3/5A 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, power efficiency, and automotive-grade qualification.
The SMAJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, low clamping, and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of SMAJ48CA-E3/5A at its rated peak pulse current?
The SMAJ48CA-E3/5A exhibits a maximum clamping voltage (VC) of 77.4 V at its specified peak pulse current (IPPM) of 5.2 A under the 10/1000 μs waveform condition. This value is measured per JEDEC standards and guarantees that downstream circuitry sees no more than 77.4 V during a defined surge event - a critical parameter for validating protection margins in 48 V systems. The SMAJ48CA-E3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ48CA-E3/5A suitable for automotive applications?
SMAJ48CA-E3/5A itself is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers the functionally identical SMAJ48CAHE3_A/I variant - which shares the same electrical parameters, package, and marking - explicitly qualified to AEC-Q101. For production automotive use, engineers must select the HE3-suffixed part; SMAJ48CA-E3/5A may be used in automotive prototyping or non-safety-critical subsystems where formal qualification is not mandated.
How does the bidirectional nature of SMAJ48CA-E3/5A affect its circuit implementation?
As a bidirectional TVS, SMAJ48CA-E3/5A has no polarity marking and conducts identically in both directions - making it ideal for protecting AC signals, floating buses (e.g., CAN, RS-485), or ungrounded power domains. Unlike unidirectional variants, it requires no orientation during placement and clamps positive and negative transients to symmetric limits (±77.4 V). This eliminates risk of incorrect orientation and simplifies layout for differential or dual-rail systems.
What is the thermal resistance and power derating behavior of SMAJ48CA-E3/5A?
SMAJ48CA-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on standard FR-4 with minimal copper. Its peak pulse power rating drops from 400 W at 25 °C ambient to ~240 W at 85 °C ambient, per Vishay's Fig. 2 derating curve. Continuous power dissipation is limited to 3.3 W at 50 °C on infinite heatsink - meaning sustained DC leakage or repeated surges require thermal analysis to avoid exceeding TJ = 150 °C.
Does SMAJ48CA-E3/5A meet industry surge immunity standards such as IEC 61000-4-5?
Yes - SMAJ48CA-E3/5A's 400 W peak pulse power rating with 10/1000 μs waveform, tested on 5.0 mm × 5.0 mm copper pads, aligns with the energy requirements of IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 kV line-to-line). When implemented with proper PCB layout (short traces, low-inductance grounding), it forms the core of a compliant protection stage for 48 V systems. Full system-level compliance requires validation with associated series impedance and downstream filtering.
SMAJ48CA-E3/5A 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ48CA-E3/5A FAQ
1.How can I place an order for SMAJ48CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CA-E3/5A 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 SMAJ48CA-E3/5A reliable?
The price and inventory of SMAJ48CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ48CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CA-E3/5A?
SMAJ48CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CA-E3/5A 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 SMAJ48CA-E3/5A?
For technical support, including SMAJ48CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ48CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ48CA-E3/5A 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 SMAJ48CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ48CA-E3/5A?
All SMAJ48CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CA-E3/5A, 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 SMAJ48CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ48CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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