My Inquiry
My Account
Taiwan Semiconductor Corporation 1SMA5943H
- Part No.:
- 1SMA5943H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5943H.pdf
- Description:
- DIODE ZENER 56V 1.5W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,486
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMA5943H from Taiwan Semiconductor is a 1.5W surface-mount Zener diode with nominal zener voltage of 56V (±5%), dynamic impedance of 1300Ω at 6.7mA test current, and maximum DC zener current of 27mA. It features glass passivated junction, AEC-Q101 qualification, and low leakage current (<0.5μA at 42.6V), designed for precision voltage regulation in compact power converters.
For engineers reviewing the 1SMA5943H datasheet, 1SMA5943H pinout, 1SMA5943H application, or 1SMA5943H equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, thermal derating behavior above 75°C, junction temperature range (–55°C to +150°C), and compliance with JEDEC Class 3B HBM ESD rating.
Technical Context
The 1SMA5943H operates as a single-die, unidirectional voltage reference device with tightly controlled zener breakdown characteristics. Its 56V nominal voltage is guaranteed at thermal equilibrium with ±5% tolerance, and it maintains stable regulation under DC bias up to 1.5W dissipation at TL = 75°C.
Designed for automotive-grade reliability, the device exhibits low inductance, moisture sensitivity level 1 per J-STD-020, and matte tin-plated leads solderable per J-STD-002. The cathode band polarity marking and UL 94V-0 molding compound support automated placement and high-reliability board assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 53.2V min / 56V nom / 58.8V max - defines precise regulation window for 56V rail stabilization |
| Test Current (IZT) | 6.7 mA - standardized bias point for measuring VZ and dynamic impedance |
| Dynamic Impedance (ZZT) | 1300 Ω at IZT - indicates moderate regulation stiffness; suitable for non-critical feedback paths |
| Max DC Power Dissipation | 1.5 W at TL = 75°C - requires thermal pad design per 5mm × 5mm Cu area for full rating |
| Junction Temperature Range | –55°C to +150°C - supports operation in under-hood automotive and industrial ambient environments |
| Leakage Current (IR) | <0.5 μA at 42.6V - ensures minimal standby power loss in high-impedance bias networks |
| ESD Rating | Class 3B (HBM) per JEDEC - withstands ≥8 kV human-body-model discharge without degradation |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single anode/cathode configuration. Cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; establishes reverse-bias orientation for zener operation |
| Cathode | Regulated output node | Provides stabilized 56V potential when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use, including engine control and body modules |
| Glass passivated chip junction | Enhances long-term stability and humidity resistance versus epoxy-passivated alternatives |
| Low inductance construction | Minimizes voltage overshoot during fast transient events in SMPS feedback loops |
| Moisture sensitivity level 1 | Enables direct placement without baking; reduces manufacturing overhead |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU requirements |
Applications
| Automotive On-Board DC/DC Converter | Industrial Switching Mode Power Supply |
|---|---|
|
Use Scenario: Regulating auxiliary 56V bias rail in 12V-to-56V isolated flyback converter for ADAS camera module power. IC Role / Device Role / Timing Role: Zener reference for TL431-based feedback network, setting output voltage via resistor divider. Use Value: AEC-Q101 qualification and –55°C to +150°C operation ensure reliability across vehicle thermal cycles. |
Use Scenario: Providing overvoltage clamp and reference in 48V telecom rectifier front-end stage. IC Role / Device Role / Timing Role: Voltage clamp protecting downstream MOSFET gate drivers during load dump transients. Use Value: 1.5W power rating and 1300Ω dynamic impedance enable robust clamping without thermal runaway. |
| LED Driver Constant-Voltage Reference | Adapter Secondary-Side Feedback |
|
Use Scenario: Stabilizing reference voltage for constant-current LED string driver operating from 56V bus. IC Role / Device Role / Timing Role: Precision shunt reference replacing higher-cost IC regulators where ±5% tolerance suffices. Use Value: Low leakage (<0.5μA) minimizes error in high-impedance divider networks used with op-amp controllers. |
Use Scenario: Secondary-side voltage sensing in universal-input AC/DC adapter with 56V output. IC Role / Device Role / Timing Role: Zener element in optocoupler feedback loop, defining regulated output setpoint. Use Value: DO-214AC package enables automated placement and matches IPC-7351B land pattern for high-yield assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMZ56A (ON Semiconductor) | Same DO-214AC package; 56V ±5%, but 1.0W rating and higher ZZT (2000Ω) | Limited to lower-power feedback or clamping; not rated for 1.5W continuous dissipation | Select when thermal budget is constrained and peak power <1W; verify derating curve alignment |
| BZX84-C56 (Diodes Inc.) | SOT-23 package; same 56V ±5%, but only 300mW rating and higher leakage (≤1.0μA) | Restricted to signal-level references or low-current biasing; unsuitable for power-stage clamping | Choose for space-constrained PCBs where 1.5W dissipation is unnecessary and footprint reduction is critical |
Compared with SMZ56A and BZX84-C56, the 1SMA5943H delivers higher power handling (1.5W vs. 1.0W/0.3W), lower leakage, and automotive qualification-making it the preferred choice for thermally demanding, high-reliability 56V regulation tasks.
Availability
1SMA5943H is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, industrial switching mode power supplies, and LED driver constant-voltage references requiring stable component supply and AEC-Q101-compliant performance.
Supply support for 1SMA5943H 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The 1SMA59xxH series was developed specifically for high-reliability, surface-mount voltage regulation in automotive power systems and industrial converters-emphasizing AEC-Q101 compliance, thermal robustness, and automated assembly compatibility.
FAQ
What is the zener voltage tolerance for 1SMA5943H?
The 1SMA5943H has a zener voltage tolerance of ±5%, with a nominal value of 56V and guaranteed limits of 53.2V (minimum) and 58.8V (maximum) at thermal equilibrium and specified test current. This tolerance is marked on the device as "943A" and applies under standard test conditions defined in the datasheet.
Is 1SMA5943H suitable for automotive applications?
Yes, the 1SMA5943H is AEC-Q101 qualified and rated for junction temperatures from –55°C to +150°C, making it suitable for under-hood and cabin automotive applications such as on-board DC/DC converters and ECU power rails. Its glass passivated junction and Class 3B HBM ESD rating further support harsh automotive environments.
What is the maximum power dissipation of 1SMA5943H and how is it derated?
The 1SMA5943H has a maximum DC power dissipation of 1.5W at lead temperature (TL) = 75°C, measured on a 5mm × 5mm copper pad. Above 75°C, it derates linearly at 20 mW/°C. At TL = 125°C, the usable power drops to 0.5W, and operation beyond 150°C junction temperature is prohibited.
Does 1SMA5943H have a defined polarity marking?
Yes, the 1SMA5943H uses a cathode band to indicate polarity-consistent with DO-214AC (SMA) industry convention. The banded end is the cathode terminal, and correct orientation is essential for proper reverse-bias zener operation. This marking is visible on the molded black epoxy body and aligns with JEDEC-standard packaging practices.
What is the leakage current specification for 1SMA5943H?
The 1SMA5943H specifies a maximum leakage current (IR) of 0.5 μA at 42.6V (80% of nominal VZ). This low leakage supports high-impedance bias networks and minimizes standby power loss in precision feedback circuits-critical for energy-efficient adapters and battery-backed systems.
1SMA5943H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 86 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 42.6 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
1SMA5943H FAQ
1.How can I place an order for 1SMA5943H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5943H 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 1SMA5943H reliable?
The price and inventory of 1SMA5943H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5943H is usually 5 days.
3.What payment methods are accepted for 1SMA5943H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5943H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5943H?
1SMA5943H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5943H 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 1SMA5943H?
For technical support, including 1SMA5943H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5943H requirements.
6.How does Aetrix verify that 1SMA5943H is sourced from the original manufacturer or authorized distributors?
All 1SMA5943H 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 1SMA5943H meets industry standards.
7.What is the process for return or replacement of 1SMA5943H?
All 1SMA5943H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5943H, 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 1SMA5943H part is unused and in its original packaging.
Return procedure for 1SMA5943H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA5943H Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
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…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
