My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ48AHM3_A/I
- Part No.:
- SMAJ48AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48AHM3_A/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,171
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ48AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform).
For engineers reviewing the SMAJ48AHM3_A/I datasheet, SMAJ48AHM3_A/I pinout, SMAJ48AHM3_A/I application, or SMAJ48AHM3_A/I equivalent, this device is selected for robust overvoltage protection in automotive power rails, industrial sensor interfaces, and DC-DC converter input stages where low clamping voltage, fast response (<1 ns), and AEC-Q101 qualification are critical.
Technical Context
This TVS operates as a unidirectional avalanche diode with cathode-banded polarity, activated when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown and low leakage (<1 μA at 48 V), while its low incremental surge resistance enables precise clamping under high-current transients.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports operating junction temperatures from –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature - confirming suitability for automated SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected line. |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above nominal rail voltage. |
| 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 400 W transient. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power rating; defines energy-handling capability for lightning/inductive-switching surges. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at 48 V; negligible power loss and no thermal drift in standby operation. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB thermal design for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Cathode indicated by molded band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and chassis applications per stress test requirements including HTOL, TC, and HAST. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 (4 kV) surge events on 12 V/24 V systems without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during fast transients, protecting 50 V-rated MOSFETs and gate drivers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without baking or special handling. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter shift in harsh environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery line in engine control unit exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient spikes before they reach MCU power supply pins and CAN transceivers. Use Value: Limits voltage to ≤77.4 V during 400 W surges, preventing latch-up or oxide breakdown in 50 V-rated power management ICs. |
Use Scenario: 4–20 mA current loop input of PLC analog module subjected to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Fast-response TVS placed across input terminals to shunt transients before reaching op-amp front-end and ADC reference. Use Value: Sub-1 ns response time and <1 μA leakage preserve signal integrity and measurement accuracy in precision current sensing. |
| DC-DC Converter Input Protection | Telecom Power Supply Surge Suppression |
|
Use Scenario: 48 V input stage of isolated buck converter in base station power system experiencing lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on HV input rail, coordinated with upstream MOV and downstream filter capacitors. Use Value: 48 V VWM aligns with nominal 48 V telecom standard; 77.4 V VC ensures downstream FETs remain within SOA during IEC 61000-4-5 testing. |
Use Scenario: Secondary-side 12 V output rail of telecom AC/DC adapter subject to conducted surges per GR-1089-CORE. IC Role / Device Role / Timing Role: Secondary-level TVS safeguarding PoE controller ICs and Ethernet PHY power domains. Use Value: Halogen-free, AEC-Q101-grade construction meets telecom environmental compliance and long-term reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48AHE3_A/I | Same electrical specs, RoHS-compliant but not halogen-free; uses standard matte tin plating without halogen-free molding compound. | Approved for commercial/industrial use; not certified for automotive AEC-Q101 applications. | Select when halogen-free requirement is waived and cost optimization is prioritized over automotive qualification. |
| SMLJ48A-M3/5A | Higher 1500 W PPPM rating (10/1000 μs), DO-214AB (SMB) package, 1.5× larger footprint, same VWM/VBR/VC. | Used where higher surge margin is required (e.g., outdoor telecom cabinets); incompatible with SMA land pattern. | Choose only if board layout allows SMB footprint and system-level surge testing exceeds 400 W requirements. |
Compared with SMAJ48AHM3_A/I, SMAJ48AHE3_A/I lacks halogen-free certification and AEC-Q101 validation, limiting automotive use; SMLJ48A-M3/5A offers triple pulse power but requires PCB redesign due to larger SMB package - making SMAJ48AHM3_A/I optimal for space-constrained, automotive-grade 400 W protection.
Availability
SMAJ48AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and telecom power supplies requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SMAJ48AHM3_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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping behavior, low leakage, and robust surge endurance in compact surface-mount packages.
FAQ
What is the clamping voltage of SMAJ48AHM3_A/I at its rated peak pulse current?
The SMAJ48AHM3_A/I has a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ48AHM3_A/I maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C), ensuring predictable protection in demanding environments.
Is SMAJ48AHM3_A/I qualified for automotive applications?
Yes, SMAJ48AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and highly accelerated stress testing (HAST), validating its suitability for under-hood and chassis-mounted automotive electronics. The SMAJ48AHM3_A/I meets all requirements for use in 12 V and 24 V vehicle subsystems.
What is the difference between SMAJ48AHM3_A/I and SMAJ48AHE3_A/I?
SMAJ48AHM3_A/I is halogen-free and AEC-Q101 qualified, whereas SMAJ48AHE3_A/I is RoHS-compliant but not halogen-free and lacks AEC-Q101 certification. Both share identical electrical parameters (VWM = 48 V, VC = 77.4 V, PPPM = 400 W), but SMAJ48AHM3_A/I uses halogen-free molding compound and passes automotive reliability testing. The SMAJ48AHM3_A/I is specified for automotive-grade designs where both material compliance and qualification are mandatory.
Can SMAJ48AHM3_A/I be used in bidirectional configurations?
No, SMAJ48AHM3_A/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. Bidirectional variants carry the "CA" suffix (e.g., SMAJ48CA). Using SMAJ48AHM3_A/I in bidirectional circuits would result in forward conduction during negative transients, potentially damaging the device or failing to protect the line. For AC or dual-polarity signal lines, select SMAJ48CA or equivalent bidirectional part.
What is the thermal resistance and how does it affect PCB layout for SMAJ48AHM3_A/I?
SMAJ48AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal copper area; increasing pad size or adding thermal vias reduces RθJA and improves power handling during repetitive surges. For continuous operation near PD = 3.3 W, PCB layout must provide adequate copper area and airflow to maintain TJ < 150 °C - especially in sealed automotive enclosures.
SMAJ48AHM3_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:
- 1
- Bidirectional Channels:
- -
- 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:
- 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)
SMAJ48AHM3_A/I FAQ
1.How can I place an order for SMAJ48AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48AHM3_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 SMAJ48AHM3_A/I reliable?
The price and inventory of SMAJ48AHM3_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 SMAJ48AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ48AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48AHM3_A/I?
SMAJ48AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48AHM3_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 SMAJ48AHM3_A/I?
For technical support, including SMAJ48AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ48AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ48AHM3_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 SMAJ48AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ48AHM3_A/I?
All SMAJ48AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48AHM3_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 SMAJ48AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ48AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48AHM3_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 …
