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Vishay General Semiconductor - Diodes Division SMAJ48-E3/61
- Part No.:
- SMAJ48-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48-E3/61.pdf
- Description:
- TVS DIODE 48VWM 85.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,628
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Product details
Overview
SMAJ48-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 48 V stand-off voltage (VWM), 53.3–65.1 V breakdown voltage (VBR at 1 mA), 85.5 V maximum clamping voltage (VC) at 4.7 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ48-E3/61 datasheet, SMAJ48-E3/61 pinout, SMAJ48-E3/61 application, or SMAJ48-E3/61 equivalent, this page delivers verified electrical parameters, JEDEC-compliant DO-214AC terminal configuration, RoHS-compliant commercial-grade construction, and direct alternative part comparisons for ESD and surge protection design-in.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device that remains high-impedance below 48 V and rapidly transitions to low-impedance conduction above its breakdown threshold. Its glass-passivated junction ensures stable leakage performance (<1 µA at VWM) and fast response time (<1.0 ps), enabling effective suppression of ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).
Thermal performance is defined by RθJA = 120 °C/W (on 5.0 × 5.0 mm copper pads) and maximum junction temperature of +150 °C. The device supports repetitive surge duty cycles up to 0.01 % and meets MSL Level 1 per J-STD-020 with 260 °C solder reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 48 V nominal systems. |
| VBR (min/max) | 53.3 V / 65.1 V at 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction under normal bias. |
| VC @ IPPM | 85.5 V at 4.7 A - Clamping voltage limits downstream component stress during 10/1000 µs surge events. |
| PPPM | 400 W - Peak pulse power handling capacity on standard PCB pad layout; derates to 300 W above 78 V. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms) for uni-directional operation; validates robustness against inductive switch-off spikes. |
| Junction Temp Range | −55 °C to +150 °C - Enables deployment in automotive under-hood, industrial motor drives, and outdoor telecom equipment. |
| Leakage Current | <1 µA at 48 V - Minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, molded plastic case meeting UL 94 V-0 flammability rating. Matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards. Cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., ground or return path) in uni-directional clamp configuration. |
| Cathode (banded end) | Reverse-biased clamping node | Connected to protected line (e.g., 48 V rail or signal trace); conducts surge current to anode when VLINE exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage across temperature and lifetime; eliminates junction oxidation risk during reflow. |
| 400 W peak pulse power (10/1000 µs) | Provides single-event surge immunity exceeding IEC 61000-4-5 Level 4 (4 kV) on 50 Ω source impedance test setups. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard SMT reflow without baking; compatible with automated placement and lead-free assembly. |
| RoHS-compliant commercial grade (E3 suffix) | Meets EU Directive 2002/95/EC; JESD201 Class 1A whisker resistance validated for long-term reliability in consumer and industrial applications. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD), improving clamping precision versus silicon carbide or MOV alternatives. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O lines from inductive kickback during relay or solenoid switching in PLC output stages. IC Role / Device Role / Timing Role: Uni-directional TVS placed between 48 V supply rail and ground, clamping transients within 1 ns to limit voltage seen by 5 V logic-level shifters. Use Value: Prevents latch-up and permanent damage to STM32H7-based controllers exposed to >100 V spikes from 24–48 V DC contactors. |
Use Scenario: Surge suppression on LIN bus lines and power inputs of door module ECUs subjected to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across VBAT and chassis ground, absorbing 400 W pulses without degradation over 100,000 cycles. Use Value: Maintains <1 µA leakage at 13.5 V nominal, avoiding battery drain while surviving ISO 7637-2 Pulse 1 (−150 V) and Pulse 5a (75 V). |
| Telecom Power Rectifiers | Consumer Sensor Signal Conditioning |
|
Use Scenario: Input-stage protection for 48 V PoE-powered Ethernet switches against lightning-induced common-mode surges on DC input terminals. IC Role / Device Role / Timing Role: Paired unidirectional SMAJ48-E3/61 devices on positive and negative rails, coordinated with common-mode chokes to meet IEC 61000-4-5 4 kV compliance. Use Value: Achieves 85.5 V clamping at 4.7 A enables downstream DC/DC converters rated for 100 V input max to remain functional post-surge. |
Use Scenario: ESD hardening of analog outputs from MEMS pressure sensors in HVAC control panels exposed to human touch discharge. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) TVS placed directly at connector pins, shunting 8 kV HBM ESD events before reaching op-amp input stages. Use Value: Sub-1 µA leakage preserves 24-bit ADC reference integrity; DO-214AC footprint allows placement within 2 mm of I/O connector per IPC-7351B. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/61 | Lower VBR range (53.3–58.9 V), tighter 5 % tolerance; clamps at 77.4 V @ 5.2 A. | Better suited for 48 V systems requiring tighter voltage margin control and lower clamping voltage. | Select SMAJ48A-E3/61 when system tolerances demand ≤77.4 V clamping and VBR consistency is critical for predictable turn-on. |
| SMBJ48-E3/52 | Same VWM/VBR specs but in larger DO-214AA (SMB) package; 600 W PPPM, higher IPPM (7.3 A), RθJA = 80 °C/W. | Higher power handling and thermal dissipation; requires larger PCB area and different pad layout. | Choose SMBJ48-E3/52 only when surge energy exceeds 400 W capability or board layout permits SMB footprint and enhanced thermal relief. |
Compared with SMAJ48-E3/61, the SMAJ48A-E3/61 offers tighter VBR control and lower clamping for precision 48 V rail protection, while the SMBJ48-E3/52 provides 50 % higher surge power headroom at the cost of increased board space and thermal design complexity.
Availability
SMAJ48-E3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power rectifiers, and consumer sensor signal conditioning requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ48-E3/61 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability surface-mount transient suppression in space-constrained, high-surge environments - targeting industrial automation, automotive electronics, and infrastructure power systems where consistent clamping and JEDEC-compliant manufacturability are essential.
FAQ
What is the maximum clamping voltage of SMAJ48-E3/61 under a 10/1000 µs surge?
The SMAJ48-E3/61 has a maximum clamping voltage (VC) of 85.5 V at 4.7 A peak pulse current (IPPM) when tested with a 10/1000 µs waveform. This value is measured under standard conditions: TA = 25 °C, mounted on 0.2 × 0.2 inch copper pads. It defines the upper voltage limit imposed on protected circuitry during surge events, ensuring downstream components like 100 V-rated DC/DC converters remain within safe operating limits. The SMAJ48-E3/61 maintains this clamping performance across its full operational temperature range.
Is SMAJ48-E3/61 RoHS compliant and qualified for lead-free reflow?
Yes, SMAJ48-E3/61 is RoHS compliant per Directive 2002/95/EC and qualified for lead-free reflow processing. Its matte tin-plated leads meet J-STD-002 and JESD22-B102 solderability standards, and it satisfies MSL Level 1 per J-STD-020 with a maximum peak reflow temperature of 260 °C. The E3 suffix confirms JESD201 Class 1A whisker resistance testing, making SMAJ48-E3/61 suitable for high-volume automated assembly in commercial and industrial applications without pre-baking requirements.
How does SMAJ48-E3/61 differ from SMAJ48A-E3/61?
SMAJ48-E3/61 and SMAJ48A-E3/61 share identical VWM (48 V) and package (DO-214AC), but differ in breakdown voltage tolerance and clamping performance. SMAJ48-E3/61 has a VBR range of 53.3–65.1 V (10 % tolerance), while SMAJ48A-E3/61 specifies 53.3–58.9 V (5 % tolerance). Correspondingly, SMAJ48A-E3/61 clamps at 77.4 V (vs. 85.5 V for SMAJ48-E3/61) at a slightly higher IPPM of 5.2 A. The SMAJ48A-E3/61 variant is preferred when tighter voltage control and lower clamping are required in precision 48 V systems.
What is the reverse leakage current specification for SMAJ48-E3/61 at rated VWM?
The SMAJ48-E3/61 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage (VWM) of 48 V and TA = 25 °C. This low leakage ensures minimal power loss in always-on applications such as battery-backed sensor nodes or standby power rails. Leakage remains below 5 µA up to +125 °C, supporting reliable operation in industrial ambient conditions without compromising system efficiency or signal integrity in high-impedance monitoring circuits.
Can SMAJ48-E3/61 be used in bi-directional surge protection applications?
No, SMAJ48-E3/61 is a unidirectional TVS diode and is not rated for bi-directional operation. Its cathode band marking and electrical specifications apply only to reverse-biased conduction. For bi-directional transient suppression (e.g., AC lines or differential data buses), Vishay specifies CA-suffix variants such as SMAJ48CA-E3/61, which provide symmetrical clamping in both polarities. Using SMAJ48-E3/61 in bi-directional configurations risks forward conduction and failure during negative transients; always verify polarity alignment and select CA-series parts for true bidirectional protection.
SMAJ48-E3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 85.5V
- Current - Peak Pulse (10/1000µs):
- 4.7A
- 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)
SMAJ48-E3/61 FAQ
1.How can I place an order for SMAJ48-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48-E3/61 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 SMAJ48-E3/61 reliable?
The price and inventory of SMAJ48-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ48-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48-E3/61?
SMAJ48-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48-E3/61 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 SMAJ48-E3/61?
For technical support, including SMAJ48-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48-E3/61 requirements.
6.How does Aetrix verify that SMAJ48-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ48-E3/61 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 SMAJ48-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ48-E3/61?
All SMAJ48-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48-E3/61, 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 SMAJ48-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ48-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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