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Vishay General Semiconductor - Diodes Division SMAJ48CAHE3/5A
- Part No.:
- SMAJ48CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CAHE3/5A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ48CAHE3/5A 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 SMAJ48CAHE3/5A datasheet, SMAJ48CAHE3/5A pinout, SMAJ48CAHE3/5A application, or SMAJ48CAHE3/5A equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 48 V), but triggers into low-impedance conduction when transients exceed VBR, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and fast response (<1 ns).
The device is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W ≤78 V; 300 W >78 V), with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W - enabling reliable operation up to TJ = +150 °C in compact PCB layouts with minimal copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR min/max | 53.3 V / 58.9 V at IT = 1 mA - guaranteed breakdown range ensuring consistent turn-on across production lots |
| VC @ IPPM | 77.4 V at 5.2 A - clamping voltage during 10/1000 μs surge; limits stress on protected circuitry |
| PPPM | 400 W - peak pulse power handling capability with standard lightning/surge waveform; validates protection level per IEC 61000-4-5 |
| ID @ VWM | 1.0 μA - ultra-low reverse leakage at stand-off voltage, minimizing standby power loss in battery-powered systems |
| TJ max. | +150 °C - maximum junction temperature rating supporting under-hood automotive and high-ambient industrial use |
| 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, bidirectional configuration with no polarity marking; matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1 (JEDEC J-STD-020), LF peak reflow 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient current return path | Bidirectional terminals - either end serves as cathode or anode depending on transient polarity; symmetric clamping in both directions |
| Anode (Cathode) | Transient current return path | Identical electrical role to opposite terminal; no band marking required for CA-type devices |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Validates protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-line, 2 kV line-to-ground) without derating |
| AEC-Q101 qualified (HE3 suffix) | Enables direct use in automotive powertrain, body control, and ADAS modules without additional qualification effort |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without baking or special handling |
| Glass-passivated junction | Ensures stable VBR over time and temperature, with <0.1 %/°C drift and immunity to humidity-induced parameter shift |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving protection margin |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power inputs in engine control units (ECUs) against load dump and alternator transients per ISO 16750-2. IC Role / Device Role / Timing Role: Shunt clamping TVS placed directly at connector entry point to clamp spikes before reaching DC-DC converters and microcontrollers. Use Value: Withstands 400 W surges and operates up to +150 °C, meeting under-hood thermal and surge requirements without derating. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional clamping element on signal lines to suppress ESD (IEC 61000-4-2) and inductive switching noise from solenoids or relays. Use Value: Symmetric 48 V clamping ensures equal protection for positive/negative transients; <1 μA leakage preserves signal integrity. |
| Telecom Interface Surge Protection | Consumer Device USB/Power Port Protection |
|
Use Scenario: Front-end protection for RS-485 transceivers in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge diverter on differential bus lines, coordinated with secondary GDT or polymer PTC for multi-stage protection. Use Value: 77.4 V clamping voltage stays within RS-485 common-mode range (±7 V to ±12 V), preventing false triggering while limiting stress. |
Use Scenario: Input-side overvoltage suppression for USB-C PD power delivery circuits in portable monitors and docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS line to absorb 8–20 V transients from hot-plug events or adapter faults before buck converter input. Use Value: 48 V VWM provides 2× margin over 20 V PD3.1 max, while SMA footprint enables dense layout near connector. |
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 | Same electrical specs and AEC-Q101 qualification, but halogen-free construction (HM3 variant not applicable - HE3 is halogen-free RoHS + AEC-Q101) | No difference in automotive or industrial use; identical thermal and surge performance | Select if halogen-free compliance is mandated by OEM material declaration requirements |
| SMBJ48CAHE3/5A | Higher 600 W PPPM rating, same VWM/VBR/VC, but larger SMB (DO-214AA) package (4.58 mm × 3.94 mm vs. SMA's 4.50 mm × 2.79 mm) | Requires PCB layout change; better suited for higher-energy surges where space allows | Choose only when 400 W is insufficient and board area permits larger footprint |
Compared with SMAJ48CAHE3/5A, SMAJ48CA-M3/5A offers identical protection performance with halogen-free materials, while SMBJ48CAHE3/5A trades compact size for 50 % higher surge power - making SMAJ48CAHE3/5A optimal for space-constrained AEC-Q101 designs needing exact 400 W capability.
Availability
SMAJ48CAHE3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom data line protection, and consumer USB-C power port hardening requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ48CAHE3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series is engineered specifically for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 compliance, and precise clamping are mandatory.
FAQ
What is the clamping voltage of SMAJ48CAHE3/5A at its rated peak pulse current?
The SMAJ48CAHE3/5A has a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected downstream circuitry sees no more than 77.4 V during a defined surge event - critical for ensuring compatibility with 80 V-rated ICs and MOSFETs. The SMAJ48CAHE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ48CAHE3/5A suitable for automotive applications?
Yes, SMAJ48CAHE3/5A is AEC-Q101 qualified (as indicated by the HE3 suffix), meaning it has passed rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD per automotive standards. It operates reliably from –55 °C to +150 °C and is rated for under-hood environments. The SMAJ48CAHE3/5A is commonly used in engine control modules, body electronics, and ADAS power supplies where certified surge protection is required.
What does the "CA" suffix mean in SMAJ48CAHE3/5A?
The "CA" suffix in SMAJ48CAHE3/5A denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants, SMAJ48CAHE3/5A has no polarity marking and clamps equally in either direction, making it ideal for AC-coupled signal lines, differential buses like RS-485, or any application where transient polarity is unpredictable. This is confirmed in the Vishay datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS".
What is the maximum reverse leakage current of SMAJ48CAHE3/5A at its stand-off voltage?
The SMAJ48CAHE3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 48 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage ensures minimal power drain in always-on systems such as automotive telematics or industrial IoT sensors. Leakage remains below 5 μA even at +85 °C, preserving battery life and signal accuracy in precision analog front-ends protected by the SMAJ48CAHE3/5A.
How does the SMAJ48CAHE3/5A package compare to SMBJ and SMC variants?
The SMAJ48CAHE3/5A uses the SMA (DO-214AC) package - measuring 4.50 mm × 2.79 mm - offering the smallest footprint among Vishay's 400 W TVS family. In contrast, SMBJ48CAHE3/5A uses the larger SMB (DO-214AA) package (4.58 mm × 3.94 mm) with 600 W rating, and SMC variants use DO-214AB (7.11 mm × 6.22 mm) for 1500 W. The SMAJ48CAHE3/5A's compact size enables high-density routing near connectors or ICs without sacrificing AEC-Q101 compliance or 400 W surge capability.
SMAJ48CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ48CAHE3/5A FAQ
1.How can I place an order for SMAJ48CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CAHE3/5A 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 SMAJ48CAHE3/5A reliable?
The price and inventory of SMAJ48CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ48CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CAHE3/5A?
SMAJ48CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CAHE3/5A 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 SMAJ48CAHE3/5A?
For technical support, including SMAJ48CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ48CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ48CAHE3/5A 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 SMAJ48CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ48CAHE3/5A?
All SMAJ48CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CAHE3/5A, 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 SMAJ48CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ48CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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