My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ48HE3/5A
- Part No.:
- SMAJ48HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48HE3/5A.pdf
- Description:
- TVS DIODE 48VWM 85.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,894
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ48HE3/5A from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) in DO-214AC (SMA) package, designed for automotive and industrial overvoltage protection. It features 48 V stand-off voltage (VWM), 53.3–65.1 V breakdown range (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.
For engineers reviewing the SMAJ48HE3/5A datasheet, SMAJ48HE3/5A pinout, SMAJ48HE3/5A application, or SMAJ48HE3/5A equivalent, this device serves as a robust, RoHS-compliant surge protector for 12 V/24 V automotive power rails, sensor signal lines, and MOSFET gate drivers where high surge immunity and automotive-grade reliability are required.
Technical Context
This unidirectional TVS diode operates with a glass-passivated junction and exhibits fast response time (<1 ps), low incremental surge resistance, and excellent clamping performance under repetitive 10/1000 µs transients. Its thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature.
The device is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), supports matte tin-plated leads compliant with J-STD-002 and JESD22-B102, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 48 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 24 V nominal systems. |
| VBR (Breakdown Voltage) | 53.3–65.1 V at 1 mA - Confirmed minimum/maximum breakdown threshold; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 85.5 V at 4.7 A - Peak voltage seen by protected circuit during 10/1000 µs surge; limits stress on downstream ICs and MOSFETs. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability under standard 10/1000 µs waveform; sufficient for ISO 7637-2 Pulse 1/2a/5a compliance. |
| IPPM (Peak Pulse Current) | 4.7 A - Maximum surge current handled at VC; directly determines protection level for defined transient waveforms. |
| TJmax | 150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating below ambient. |
| Package | DO-214AC (SMA) - Surface-mount, low-profile package compatible with automated placement and IPC-7351B land patterns. |
Pinout & Package
DO-214AC (SMA) package with cathode band marking; two-terminal unidirectional configuration. Cathode terminal is marked by a band on the body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected circuit return path / reference node | Connected to system ground or low-impedance return; clamps positive transients relative to this node. |
| Anode (unmarked end) | Input line connection point | Connected to line being protected (e.g., battery rail, sensor supply); conducts surge current to cathode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensors requiring high-reliability surge suppression. |
| Glass-passivated junction | Ensures stable electrical characteristics over temperature and lifetime; prevents degradation from moisture or contamination in harsh environments. |
| MSL Level 1 rating | Allows unlimited floor life and full 260 °C reflow compatibility without baking; simplifies manufacturing for high-volume automotive PCB assembly. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients; improves clamping precision for sensitive 3.3 V/5 V logic interfaces. |
| RoHS-compliant HE3 suffix | Indicates high-reliability, automotive-grade construction with JESD201 Class 2 whisker resistance; suitable for mission-critical systems. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ground, clamping surges within microseconds. Use Value: Limits peak voltage to ≤85.5 V, preventing damage to microcontrollers, CAN transceivers, and power management ICs. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and inductive coupling in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair or single-ended output to ground. Use Value: Maintains signal integrity with <100 pF junction capacitance while absorbing ±8 kV contact ESD per IEC 61000-4-2. |
| MOSFET Gate Driver Protection | Telecom DC Power Input Protection |
|
Use Scenario: Safeguarding high-side N-channel MOSFET gates driven by isolated gate drivers in motor control inverters. IC Role / Device Role / Timing Role: TVS placed between gate and source to clamp Miller-induced voltage spikes during switching transitions. Use Value: Prevents gate oxide rupture with 85.5 V clamping ceiling, supporting 60 V-rated MOSFETs in 24 V systems. |
Use Scenario: Securing -48 V telecom power inputs against lightning-induced surges and hot-swap transients in base station equipment. IC Role / Device Role / Timing Role: Unidirectional TVS installed on negative rail with cathode tied to system ground. Use Value: Withstands 400 W pulses and 40 A surge current, meeting GR-1089-CORE Level 3 surge requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48AHE3/5A | Lower VBR range (53.3–58.9 V) and lower VC (77.4 V at 5.2 A); tighter breakdown tolerance. | Better suited for systems requiring tighter clamping voltage margin, e.g., 3.3 V logic-supplied gate drivers with strict VGS limits. | Select SMAJ48AHE3/5A when clamping voltage headroom is critical and peak surge current is ≤5.2 A. |
| SMBJ48HE3/5A | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; higher PPPM (600 W) and IPPM (10.3 A). | Preferred for higher-energy transients (e.g., ISO 16750-2 long-duration surges) where PCB space permits larger footprint. | Choose SMBJ48HE3/5A when surge energy exceeds 400 W capability and layout allows SMB pad pattern. |
Compared with SMAJ48HE3/5A, SMAJ48AHE3/5A offers tighter clamping at lower surge currents, while SMBJ48HE3/5A delivers higher energy handling in a larger package-enabling selection based on precise clamping needs versus surge energy budget.
Availability
SMAJ48HE3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor modules, and telecom power supplies requiring stable component supply with AEC-Q101 qualification and long-term lifecycle support.
Supply support for SMAJ48HE3/5A 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series was developed specifically for surface-mount transient suppression in automotive, industrial, and communications systems-prioritizing AEC-Q101 compliance, low clamping voltage, and robust surge handling in compact DO-214AC packaging.
FAQ
What is the clamping voltage of SMAJ48HE3/5A at its rated peak pulse current?
The SMAJ48HE3/5A has a maximum clamping voltage (VC) of 85.5 V at 4.7 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per JEDEC standards and guarantees the protected circuit sees no more than 85.5 V during specified surge events. The clamping performance is validated across temperature and production lots, and is a key parameter used in ISO 7637-2 compliance testing for SMAJ48HE3/5A.
Is SMAJ48HE3/5A suitable for bidirectional transient protection?
No, SMAJ48HE3/5A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its single cathode band marking. For bidirectional protection, Vishay specifies parts like SMAJ48CAHE3/5A. Using SMAJ48HE3/5A in bidirectional applications risks failure during negative-going transients, as it only blocks reverse voltage up to VWM = 48 V and conducts forward current above ~1.5 V-making SMAJ48HE3/5A appropriate only for DC-biased lines with defined polarity.
What does the "HE3" suffix signify in SMAJ48HE3/5A?
The "HE3" suffix in SMAJ48HE3/5A denotes high-reliability, automotive-grade construction: "H" indicates AEC-Q101 qualification, "E3" confirms RoHS compliance and JESD201 Class 2 whisker resistance. This distinguishes it from commercial-grade "E3" parts (e.g., SMAJ48E3/5A) and ensures suitability for under-hood automotive use, extended temperature cycling, and long-term field reliability-critical for SMAJ48HE3/5A deployment in safety-relevant systems.
How does the thermal performance of SMAJ48HE3/5A affect PCB layout?
SMAJ48HE3/5A has a junction-to-ambient thermal resistance (RθJA) of 120 °C/W, meaning copper pad area directly impacts power dissipation capability. Vishay recommends 0.2 × 0.2 inch (5.0 × 5.0 mm) pads per terminal to achieve rated 400 W pulse power. Reducing pad size increases thermal impedance, causing higher junction temperatures during repeated surges and potentially triggering thermal runaway-so proper SMAJ48HE3/5A layout requires adherence to the documented mounting pad dimensions.
Can SMAJ48HE3/5A replace SMAJ48AHE3/5A in an existing design?
SMAJ48HE3/5A and SMAJ48AHE3/5A are not direct replacements due to differing clamping performance: SMAJ48HE3/5A clamps at 85.5 V (4.7 A), while SMAJ48AHE3/5A clamps at 77.4 V (5.2 A). Substituting SMAJ48HE3/5A may expose downstream components to higher transient voltages. Design validation-including surge testing per IEC 61000-4-5-is required before interchange. Always verify VC, IPPM, and system-level immunity margins when considering SMAJ48HE3/5A as a substitute.
SMAJ48HE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ48HE3/5A FAQ
1.How can I place an order for SMAJ48HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48HE3/5A 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 SMAJ48HE3/5A reliable?
The price and inventory of SMAJ48HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48HE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ48HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48HE3/5A?
SMAJ48HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48HE3/5A 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 SMAJ48HE3/5A?
For technical support, including SMAJ48HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48HE3/5A requirements.
6.How does Aetrix verify that SMAJ48HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ48HE3/5A 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 SMAJ48HE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ48HE3/5A?
All SMAJ48HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48HE3/5A, 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 SMAJ48HE3/5A part is unused and in its original packaging.
Return procedure for SMAJ48HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48HE3/5A 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 …
