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**An example: RN R 50 H 1001 F M**

RN |
R |
50 |
H |
1001 |
F |
M |

| | | | | | | | | | | | | |

metal film resistor | terminal type | wattage rating | characteristic | resistance | tolerance | failure rate |

1 | 2 | 3 | 4 | 5 | 6 | 7 |

1. **RN** = metal film resistor

2. **Terminal type** (high reliability)

- R = solderable leads
- C = solderable and weldable leads
- N = weldable leads

3.**Wattage rating**

- 50 = 1/20 watt
- 55 = 1/10 watt
- 60 = 1/8 watt
- 65 = 1/4 watt
- 70 = 1/2 watt
- 75 = 1 watt

4. **Characteristic:** (temperature coefficient) i.e., How much R will change per degree centigrade or "parts per million" 9PPM)

- non hermetically sealed resistors
- H = 50 PPM
- J = 25 PPM
- K = 100 PPM

- hermetically sealed resistors
- C = 50 PPM
- E = 25 PPM

5. **Resistance value:** First three digits are significant. The last digit indicates the number of zeros: i.e.,

- 1001 = 100 with 1 zero = 1,000 Ohm
- 1002 = 100 with 2 zeros = 10,000 Ohm
- R = decimal point - 49R9 = 49.9 Ohm

6. **Tolerance:**

- F = 1 %
- D = 1/2 %
- B = 1/10 %

7. **Failure rate:**

- M = 1.0 % at 1000 hrs.
- P = 0.1 % at 1000 hrs.
- R = 0.01 % at 1000 hrs.
- S = 0.001 % at 1000 hrs.

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