My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ70CAHM3/H
- Part No.:
- SMAJ70CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAHM3/H.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,321
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ70CAHM3/H 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 70 V standoff voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 113 V maximum clamping voltage (VC) at 3.5 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It is widely deployed to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply rails.
For engineers reviewing the SMAJ70CAHM3/H datasheet, SMAJ70CAHM3/H pinout, SMAJ70CAHM3/H application, or SMAJ70CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compliance with UL 497B for telecom surge protection.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 70 V), but triggers into low-impedance conduction when transients exceed VBR, limiting downstream voltage to ≤113 V. Its glass-passivated junction ensures stable avalanche behavior and fast response (<1 ns).
The SMAJ70CAHM3/H 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 performance defined by RθJL = 30 °C/W and TJ max = +150 °C. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 72 V nominal DC rails. |
| VBR (min/max) | 77.8 V / 86.0 V at IT = 1 mA - Confirmed bidirectional breakdown window; ensures symmetric clamping in both polarities. |
| VC @ IPPM | 113 V at IPPM = 3.5 A - Clamping voltage under standardized 10/1000 μs surge; limits stress on protected ICs to safe levels. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) testing. |
| ID @ VWM | 1.0 μA - Reverse leakage at 70 V; negligible power loss and minimal impact on high-impedance sensor bias networks. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal footprint; compatible with automated reflow assembly. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | Bidirectional device: no polarity marking; either terminal serves as anode or cathode depending on transient polarity. |
| Cathode | Terminal K | Same physical terminal as Anode; symmetrical structure enables identical clamping in both directions without orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22 standards - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS | HM3 suffix denotes full compliance with JEDEC J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance - suitable for lead-free manufacturing and green procurement programs. |
| 400 W peak pulse power | Handles 10/1000 μs surges up to 3.5 A without degradation - meets IEC 61000-4-5 surge immunity requirements for industrial PLCs and telecom interfaces. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Clamps at only 1.45× minimum breakdown voltage - minimizes overvoltage overshoot during fast transients compared to higher-ratio TVS devices. |
| Fast response time | <1 ns turn-on delay - protects CMOS inputs and high-speed data lines from sub-microsecond EFT/burst events. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump (ISO 16750-2) and alternator switching transients. IC Role / Device Role / Timing Role: Shunt clamping element placed across input rail upstream of DC/DC converter and LDO regulators. Use Value: Limits transient voltage to ≤113 V, preventing damage to 36 V-rated input stages and enabling use of cost-optimized downstream regulators. |
Use Scenario: Safeguarding analog outputs (4–20 mA, 0–10 V) and digital I/O (CAN, LIN) in factory automation sensors exposed to motor noise and relay switching. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on differential or single-ended signal paths between field devices and PLC analog modules. Use Value: Maintains signal integrity under ±1 kV ESD (IEC 61000-4-2) and ±0.5 kV surge (IEC 61000-4-5), avoiding false triggering or ADC saturation. |
| Telecom Interface Surge Suppression | Consumer Device USB/Power Port Protection |
|
Use Scenario: Front-end protection for Ethernet PHYs, PoE injectors, and DSL line drivers subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS placed at connector entry point, coordinated with secondary GDT or polymer PTC. Use Value: UL 497B recognition enables system-level safety certification; 113 V clamping prevents latch-up in 3.3 V/5 V PHY transceivers. |
Use Scenario: Input-stage overvoltage protection for USB-C PD ports, wireless charging receivers, and smart home hubs connected to unregulated wall adapters. IC Role / Device Role / Timing Role: Standoff-rated clamp on VBUS line to absorb plug-in spikes and adapter fault conditions before reaching buck converters or battery management ICs. Use Value: 70 V VWM allows compatibility with 48 V PD 3.1 sources while clamping faults to safe levels for 20 V-rated silicon. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CAHE3/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free mandate (E3 vs HM3). | Acceptable for non-automotive industrial designs where halogen-free is not mandated by OEM or regional regulation. | Select SMAJ70CAHE3/H if halogen-free material is not required and cost optimization is prioritized. |
| SMBJ70CAHM3 | Higher 600 W PPPM rating, larger SMB (DO-214AA) package, same VWM/VBR/VC, identical AEC-Q101 and HM3 compliance. | Better suited for higher-energy surge environments (e.g., 48 V EV charging ports) where PCB space permits larger footprint. | Choose SMBJ70CAHM3 when system-level surge test levels exceed 400 W or thermal dissipation demands lower RθJA. |
Compared with SMAJ70CAHE3/H, the SMAJ70CAHM3/H adds halogen-free construction without sacrificing performance; versus SMBJ70CAHM3, it trades 200 W pulse power headroom for 30% smaller board area and identical automotive qualification - ideal for space-constrained ECU modules.
Availability
SMAJ70CAHM3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom surge suppression, and consumer USB-C power port safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMAJ70CAHM3/H 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, MOSFETs, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure modes must be mitigated without compromising signal fidelity or thermal performance.
FAQ
What does the "HM3" suffix indicate for SMAJ70CAHM3/H?
The HM3 suffix on SMAJ70CAHM3/H specifies halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance and MSL Level 1 moisture sensitivity - confirming suitability for lead-free reflow and automotive AEC-Q101 qualification. This distinguishes it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS) variants. SMAJ70CAHM3/H meets strict environmental and reliability mandates for Tier 1 automotive suppliers.
Is SMAJ70CAHM3/H bidirectional, and how does that affect circuit placement?
Yes, SMAJ70CAHM3/H is a bidirectional TVS diode - its CA suffix and symmetric VBR min/max (77.8 V / 86.0 V) confirm identical clamping behavior in both polarities. Unlike unidirectional types, it has no cathode band marking and may be mounted in either orientation. This simplifies layout on AC-coupled lines, differential buses (e.g., CAN), or any path where polarity reversal is possible, eliminating orientation errors during automated placement.
What is the maximum clamping voltage of SMAJ70CAHM3/H, and under what test condition is it specified?
The maximum clamping voltage of SMAJ70CAHM3/H is 113 V, measured at a peak pulse current (IPPM) of 3.5 A using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across temperature and lifetime per Vishay's datasheet (Doc. #88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Can SMAJ70CAHM3/H replace SMAJ70A in a design?
No - SMAJ70A is unidirectional with cathode marking and forward voltage drop, while SMAJ70CAHM3/H is bidirectional with symmetrical clamping. Substituting SMAJ70CAHM3/H for SMAJ70A would eliminate polarity-sensitive protection and may compromise circuits relying on DC blocking or rectification. Always verify directionality, VBR tolerance, and application context before interchange; SMAJ70CAHM3/H is not a drop-in replacement for unidirectional variants.
Does SMAJ70CAHM3/H meet UL 497B recognition, and why does that matter?
Yes, SMAJ70CAHM3/H carries Underwriters Laboratory Recognition (QVGQ2) under UL 497B for telecommunications primary protector classification (File E136766). This certification validates its ability to safely interrupt surge currents without fire hazard or sustained arcing - a mandatory requirement for telecom infrastructure equipment, PoE switches, and networked industrial gateways seeking UL listing or FCC compliance.
SMAJ70CAHM3/H 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- 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)
SMAJ70CAHM3/H FAQ
1.How can I place an order for SMAJ70CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAHM3/H 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 SMAJ70CAHM3/H reliable?
The price and inventory of SMAJ70CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ70CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAHM3/H?
SMAJ70CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAHM3/H 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 SMAJ70CAHM3/H?
For technical support, including SMAJ70CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAHM3/H requirements.
6.How does Aetrix verify that SMAJ70CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAHM3/H 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 SMAJ70CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ70CAHM3/H?
All SMAJ70CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAHM3/H, 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 SMAJ70CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ70CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70CAHM3/H 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
